Resources

17 pages, 1529 KiB

Open AccessArticle

Post-Extractivism and Bioeconomy: An Experimental Analysis of Combustion and Pyrolysis Processes as Alternatives to Add Value to Agro-Residues (Coffee Husks) Generated in Farmer Cooperatives of the Ecuadorian Amazon

by Mario A. Heredia Salgado, Ina Säumel and Luís A. C. Tarelho

Resources 2024, 13(10), 142; https://doi.org/10.3390/resources13100142 - 14 Oct 2024

Abstract

A post-extractivist development model for communities in the Amazon that is not based on non-renewable resource extraction demands the study and demonstration, in the field, of alternative economic activities that add value to currently generated residual biomass. Following the principles of bioeconomy, this [...] Read more.

A post-extractivist development model for communities in the Amazon that is not based on non-renewable resource extraction demands the study and demonstration, in the field, of alternative economic activities that add value to currently generated residual biomass. Following the principles of bioeconomy, this study presents an experimental analysis of a retort burner and a pilot-scale auger-type pyrolysis reactor used to convert coffee husks generated in a collection and post-harvesting center of a farmer’s cooperative into thermal energy and biochar, respectively. This study shows that coffee husks, whether used as feedstock for combustion or pyrolysis processes, can supply the thermal energy required by the post-harvesting processes. The combustion or pyrolysis of coffee husks avoids its accumulation and decomposition while replacing fossil fuels used in post-harvesting operations, reducing costs and making farmers independent of fossil fuel subsidies. Unlike combustion (11,029.4 mg/Nm³), the CO concentration in the flue gas during the pyrolysis process was 458.3 mg/Nm³, which is below the eco-design standard of 500 mg/Nm³. According to the European Biochar Certificate, carbon content (67.4 wt%) and H/C_org, O/C_org (0.6 and 0.1, respectively) are within the typical values of biochars used for soil amendment and carbon sequestration. Nonetheless, the concentration of polycyclic aromatic hydrocarbons must be assessed to fully regard this material as biochar. Finally, further studies are required to assess the ability of cooperatives to generate and trade carbon credits linked with the application of biochar in their cropping systems. Full article

(This article belongs to the Special Issue Resource Extraction from Agricultural Products/Waste: 2nd Edition)

► Show Figures

Figure 1

20 pages, 2585 KiB

Open AccessArticle

Social Life Cycle Assessment of Cocoa Production: Evidence from Ivory Coast and Ghana

by Giuliana Vinci, Marco Ruggeri, Laura Gobbi and Marco Savastano

Resources 2024, 13(10), 141; https://doi.org/10.3390/resources13100141 - 11 Oct 2024

Abstract

Cocoa is a natural resource that plays a very important role globally, being one of the most produced and traded commodities. As a labour-intensive product and considering that its cultivation involves about 50 million people globally, it seems significant to explore its social [...] Read more.

Cocoa is a natural resource that plays a very important role globally, being one of the most produced and traded commodities. As a labour-intensive product and considering that its cultivation involves about 50 million people globally, it seems significant to explore its social sustainability. In light of this, this research aimed to map social risks within the cocoa supply chain from a life cycle perspective. Therefore, the Social Life Cycle Assessment (S-LCA) was used, following the PSILCA database, considering the two most influential countries in its production, i.e., Côte d’Ivoire and Ghana. The results showed that there could be a very high risk that more than half of the cocoa globally is produced through child labour and with wages too low to guarantee workers a decent living, returning incomes of $30–38/month. Forced labour is much less frequent than child labour, while cocoa from Ghana may induce a high risk of improper work, considering the 30.2 h per week worked by farmers. This is mainly due to the low association power of 10–16%, which reveals a high risk that workers may not organise themselves into trade unions. Finally, at 23–25%, there is also a very high risk of discrimination due to the high presence of migrant labour. Therefore, the S-LCA results showed that the cocoa industry is still characterised by socially unsustainable sourcing. Full article

► Show Figures

Figure 1

38 pages, 6410 KiB

Open AccessReview

Solar Energy Resource and Power Generation in Morocco: Current Situation, Potential, and Future Perspective

by Rania Benbba, Majd Barhdadi, Antonio Ficarella, Giovanni Manente, Maria Pia Romano, Nizar El Hachemi, Abdelfettah Barhdadi, Ahmed Al-Salaymeh and Abdelkader Outzourhit

Resources 2024, 13(10), 140; https://doi.org/10.3390/resources13100140 - 11 Oct 2024

Abstract

The world’s attention is currently focused on the energy transition to sustainable energy. The drive to reduce greenhouse gas emissions in order to limit global warming, energy security, and the generalization of access to energy have contributed to the adoption of the Moroccan [...] Read more.

The world’s attention is currently focused on the energy transition to sustainable energy. The drive to reduce greenhouse gas emissions in order to limit global warming, energy security, and the generalization of access to energy have contributed to the adoption of the Moroccan Energy Strategy, with a strong focus on renewable energy (RE). Morocco is notoriously poor in conventional primary fossil energy resources, with energy dependence on the order of 90%. In addition, the energy crisis that resulted from the COVID-19 pandemic and geopolitical conflicts, compounded with steady increase in demand, has heavily affected the security and stability of the country’s energy situation. The transition to RE by strongly engaging in the implementation of several solar, wind, and hydro energy projects has made the country the leader in RE in Africa. These projects benefit from the country’s excellent solar and wind energy potential. As a consequence, by 2030, the share of RE in the installed capacity is expected to reach 52%. An overview of the current situation of RE (particularly solar energy) in Morocco is provided, including the potentials, obstacles, challenges, and future perspectives. Thanks to its high solar potential, it is predictable that Morocco’s effort will be focused on this field: the Erasmus plus INNOMED project is a virtuous example of international cooperation, aiming at promoting solar energy through capacity building and the creation of solar energy networks, in synergy with EU Partners. Full article

► Show Figures

Figure 1

14 pages, 1396 KiB

Open AccessArticle

Potential Utilization of Rice Waste in the Construction Sector: A Multi-Criteria Decision Analysis Approach

by Daniel Henao, Luz Adriana Sanchez-Echeverri and Nelson Javier Tovar-Perilla

Resources 2024, 13(10), 139; https://doi.org/10.3390/resources13100139 - 11 Oct 2024

Abstract

Effective management of agricultural waste is an important contribution to environmental sustainability and economic development, especially considering the significant volume of agricultural residues produced worldwide. Rice is a widely cultivated crop in Colombia, and its high production results in a high amount of [...] Read more.

Effective management of agricultural waste is an important contribution to environmental sustainability and economic development, especially considering the significant volume of agricultural residues produced worldwide. Rice is a widely cultivated crop in Colombia, and its high production results in a high amount of wastes, which is often underutilized due to a lack of knowledge regarding its potential value-added applications. On the other hand, the construction industry has become increasingly aware of the necessity to develop materials with reduced environmental impact. Therefore, this study explores the application of the Analytic Hierarchy Process (AHP) to evaluate various alternatives for utilizing rice waste in construction materials; the alternatives were evaluated based on criteria tailored to the needs of local agricultural communities in the Tolima region of Colombia. The findings highlight the potential of rice husk ash (RHA) as an environmentally responsible alternative in the construction sector, offering a viable solution for waste management while contributing to the economic development of small-scale farmers. Full article

(This article belongs to the Special Issue Alternative Use of Biological Resources)

► Show Figures

Figure 1

18 pages, 3634 KiB

Open AccessArticle

Environmental Impact of Polyurethane-Based Aerogel Production: Influence of Solvents and Solids Content

by Seyed Ahmad Aldaghi, Mattia Costamagna, Massimo Perucca, Esther Pinilla-Peñalver, Darío Cantero, Amaya Romero and Luz Sánchez-Silva

Resources 2024, 13(10), 138; https://doi.org/10.3390/resources13100138 - 8 Oct 2024

Abstract

This study provides a comprehensive analysis of the environmental impacts associated with the synthesis of polyurethane (PUR) aerogels. The synthesis process incorporates various solvents and solids contents into the formulation, with the primary objective of enhancing the physical properties of the aerogels for [...] Read more.

This study provides a comprehensive analysis of the environmental impacts associated with the synthesis of polyurethane (PUR) aerogels. The synthesis process incorporates various solvents and solids contents into the formulation, with the primary objective of enhancing the physical properties of the aerogels for broad industrial applications. Nine experimental scenarios were explored, grouped into two sets based on the variables studied. A detailed Life Cycle Assessment (LCA) was conducted to evaluate the environmental impacts of all formulated PUR aerogels. The findings indicate that a solvent solution of 100% ethyl acetate (EtOAc) results in lower environmental impacts compared to other tested formulations. Notably, a solvent solution comprising 75% acetonitrile (ACN) and 25% EtOAc exhibited the highest environmental Key Performance Indicator (εKPI) among the tested material formulations, closely followed by the PUR aerogel obtained using acetone as a solvent. Furthermore, this study underscores the necessity of performing an integrated LCA that considers both environmental and functional aspects. While reducing the solids content is environmentally advantageous, it may present challenges in terms of material functionality. This is illustrated by the PUR aerogel synthesized with the lowest solids content of 3.2 wt.%, which demonstrated high deformability, thereby complicating the determination of a reliable Young’s modulus for analysis. Full article

► Show Figures

Figure 1

17 pages, 3708 KiB

Open AccessArticle

Composting as a Cleaner Production Strategy for the Soil Resource of Potato Crops in Choconta, Colombia

by Angie Tatiana Ortega-Ramírez, Daniela García Moreno and Miriam Reyes Tovar

Resources 2024, 13(10), 137; https://doi.org/10.3390/resources13100137 - 30 Sep 2024

Abstract

Choconta is the municipality in Colombia with the greatest prevalence of potato planting, representing 70.90% of the total territory. However, this crop has been affected by the presence of pests, diseases, and chemical contaminants from pesticides and chemical fertilizers that deteriorate the soil [...] Read more.

Choconta is the municipality in Colombia with the greatest prevalence of potato planting, representing 70.90% of the total territory. However, this crop has been affected by the presence of pests, diseases, and chemical contaminants from pesticides and chemical fertilizers that deteriorate the soil and, therefore, the quality of the final product. Compost (organic waste with specific characteristics and made from waste generated in Choconta) was studied as a sustainable production strategy to increase soil quality and thereby the quality of the local potato crop. For this purpose, a 3 × 2 experiment design was implemented with three treatments (0%, 25%, and 50% compost) and two variables (young potato and mature potato) in duplicate for 4 months. In this experiment, the use of compost led to an improved final product, which went from a floury texture to a dense and creamy texture. The use of compost also reduced the levels of heavy metals, such as lead, with a higher removal in treatment 3 (50% composting). The estimated direct cost of the composting process was USD 280.85, slightly lower than that of the application of fertilizers at USD 294.48. The use of fertilizers has a higher environmental impact due to the use of chemical products that have environmental and health implications. Using compost did not influence tuber harvest time but had a positive impact on tuber texture quality and on soil resources through the reduction in heavy metals, especially lead (16.40–18.03 ppm for treatment 1, 17.96–18.49 ppm for treatment 2, and 15.67–17.88 ppm for treatment 3). Using compost could be environmentally and economically beneficial for local farmers, and it promotes the circular economy and sustainable communities. Full article

(This article belongs to the Collection Management, Environment, Energy and Sustainability under a Circular Economy)

► Show Figures

Figure 1

29 pages, 863 KiB

Open AccessSystematic Review

PESTEL Analysis of the Photovoltaic Market in Poland—A Systematic Review of Opportunities and Threats

by Beata Hysa and Anna Mularczyk

Resources 2024, 13(10), 136; https://doi.org/10.3390/resources13100136 - 27 Sep 2024

Abstract

In recent years, Poland has implemented substantial changes to its energy mix, resulting in an increased proportion of energy production from photovoltaics (PV). However, the photovoltaic energy market’s development is determined by several factors, and still requires further analysis. Therefore, the study’s main [...] Read more.

In recent years, Poland has implemented substantial changes to its energy mix, resulting in an increased proportion of energy production from photovoltaics (PV). However, the photovoltaic energy market’s development is determined by several factors, and still requires further analysis. Therefore, the study’s main objective was to comprehensively understand the PV phenomenon and its development in Poland. Furthermore, a PESTEL analysis was undertaken to assess the macroeconomic context of the photovoltaic industry in Poland. A systematic literature review methodology was employed to achieve this. The study’s principal findings identified a number of pivotal opportunities and barriers to PV development. The environmental benefits of CO₂ reduction and the economic advantages, including cost savings and subsidies, were identified as significant opportunities, as were social acceptance and enhanced energy security. However, obstacles to progress include outdated grid infrastructure, high investment costs, environmental concerns during the PV lifecycle, and political uncertainties. Technical challenges like grid stability and high battery costs also impede growth. Potential strategies for improvement involve better public awareness campaigns, enhanced self-consumption through storage systems, and optimised system placement. Addressing these factors could transform current neutral aspects into either opportunities or threats for PV deployment. Full article

► Show Figures

Figure 1

16 pages, 2079 KiB

Open AccessArticle

Assessing the Impact of Aridity on Argan Trees in Morocco: Implications for Conservation in a Changing Climate

by Chaima Afi, Maryem Telmoudi, Said Labbassi, Naima Chabbi, Jamal Hallam, Fouad Msanda and Naima Ait Aabd

Resources 2024, 13(10), 135; https://doi.org/10.3390/resources13100135 - 27 Sep 2024

Abstract

Climate change, through increased aridity, threatens ecosystems, including Morocco’s endemic Argania Spinosa L. Skeels. This study assesses the impact of aridity on argan trees by analyzing morphological, ecophysiological, and biochemical parameters across various regions and comparing them with historical data. Significant variations were [...] Read more.

Climate change, through increased aridity, threatens ecosystems, including Morocco’s endemic Argania Spinosa L. Skeels. This study assesses the impact of aridity on argan trees by analyzing morphological, ecophysiological, and biochemical parameters across various regions and comparing them with historical data. Significant variations were observed in leaf area, leaf length, chlorophyll content, relative water content, polyphenols, flavonoids, soluble sugars, and antioxidant activity, while leaf width ratio and chlorophyll ratio remained stable. Tioughza exhibited the largest leaf area (136.07 mm²), the highest chlorophyll content (436.76 mg/m²), and superior water retention (52.27%). Conversely, Ezzaouite showed the smallest leaf area (85.76 mm²) and lowest water content (37.68%). Increased aridity has intensified these differences, revealing the argan tree’s vulnerability to climate change. The findings underscore the need for targeted conservation efforts, including reforestation, strengthened legislation, and enhanced genetic research, to sustain this vital species. Full article

► Show Figures

Figure 1

19 pages, 881 KiB

Open AccessArticle

From Your Plate to Our Bin: Tackling Food Waste in Saudi Family Restaurants

by Abu Elnasr E. Sobaih and Ahmed E. Abu Elnasr

Resources 2024, 13(10), 134; https://doi.org/10.3390/resources13100134 - 26 Sep 2024

Abstract

This research tackled the food waste problem in Saudi Arabia, with a particular focus on family restaurants, where this issue is evident. The study adopted a semi-structured survey, including structured and open-ended questions with family restaurants’ owner–manager/managers. The results of quantitative and qualitative [...] Read more.

This research tackled the food waste problem in Saudi Arabia, with a particular focus on family restaurants, where this issue is evident. The study adopted a semi-structured survey, including structured and open-ended questions with family restaurants’ owner–manager/managers. The results of quantitative and qualitative data analysis showed that the most frequent types of food waste in family restaurants are starchy foods, especially bread and rice with a waste ratio above 50% of these items. Additionally, the average ratio of food waste was at least 20% of served food at sampled restaurants per customer. Three major reasons for this high rate of food waste were consumers’ behavior, e.g., positive attitude towards food waste; external factors, e.g., absence of a legal framework; and factors related to restaurants, e.g., food portion served and food cycle management. The results identified no applied strategies for handling food left over and reducing food waste at most (70%) of Saudi restaurants. This study calls for a national policy and program on managing food waste at Saudi family restaurants by adopting the 5Rs model for proper food waste management. Restaurants are encouraged to adopt green initiatives, such as “clean your plate” or “eat or waste” to stimulate their customers’ behavior for reducing their food waste and sustain the environment. This would support a green and circular economy. Full article

(This article belongs to the Special Issue Life Cycle Sustainability Analysis of Resource Recovery from Waste Management Systems in the Context of Circular Models of the Economy and the Bioeconomy)

► Show Figures

Figure 1

17 pages, 1827 KiB

Open AccessArticle

Spring Water Quality in a Flood-Prone Area of Kampala City, Uganda: Insights Furnished by Sanitary and Limnochemical Data

by Ronald Tenywa, Timothy Omara, Gerald Kwikiriza, Christopher Angiro and Emmanuel Ntambi

Resources 2024, 13(10), 133; https://doi.org/10.3390/resources13100133 - 25 Sep 2024

Abstract

For millennia, springs have provided water for drinking, domestic use, balneological treatment, liminality rites as well as tourist attractions. Amidst these uses, anthropogenic activities, especially urbanization and agriculture, continue to impair the functionality of springs. With the looming decadal climate change, freshwater springs [...] Read more.

For millennia, springs have provided water for drinking, domestic use, balneological treatment, liminality rites as well as tourist attractions. Amidst these uses, anthropogenic activities, especially urbanization and agriculture, continue to impair the functionality of springs. With the looming decadal climate change, freshwater springs could be a sustainable source of clean water for the realisation of Sustainable Development Goal 6. This paper presents the results of the sanitary inspection and assessment of limnochemical characteristics and quality of water samples (n = 64) from four freshwater springs (coded SPR1, SPR2, SPR3, and SPR4) in Kansanga, a flash flood-prone area in the African Great Lakes region of Uganda. Each sample was analysed for 17 parameters (temperature, pH, electrical conductivity, turbidity, fluorides, sulphates, chlorides, nitrates, orthophosphates, total dissolved solids, dissolved oxygen, total alkalinity, potassium, sodium, total, magnesium and calcium hardness) following the standard methods. Water quality index (WQI) was calculated to establish the quality of the water samples based on the physicochemical parameters measured. Based on the sanitary risk assessment results, the springs had medium- to high-risk scores, but most water parameters were within the WHO guidelines for potable water, except for nitrates (in SPR1 and SPR2), hardness levels (in SPR2), and dissolved oxygen (in all the samples). Sampling season and location had significant effects on the limnochemistry of the freshwater springs (p < 0.05). The water quality indices calculated indicated that the water from the springs was of good quality (WQI = 50–57), but there was a reduction in water quality during the wet season. The best water quality was recorded in samples from SPR4, followed by those for SPR3, SPR1, and SPR2. These results provide insights into the contribution of floods and poor sanitation facilities to the deterioration of spring water quality in Kansanga, and the need to leverage additional conservation strategies to support vulnerable communities in the area. Further studies are required to establish the risk posed by trace metals and microbes that may contaminate freshwater in the studied springs, especially following flood events. Full article

► Show Figures

Figure 1

23 pages, 2448 KiB

Open AccessArticle

Socioecological Resilience: Quantitative Assessment of the Impact of an Invasive Species Assemblage on a Lake Ecosystem

by David Ricardo Pedroza-Martínez, Julio Eduardo Beltrán-Vargas and Carlos Alfonso Zafra-Mejía

Resources 2024, 13(10), 132; https://doi.org/10.3390/resources13100132 - 25 Sep 2024

Abstract

An invasive assemblage refers to a group of invasive species that coexist and interact within an ecosystem, significantly altering its dynamics, biodiversity, functions, and ecosystem services. Their presence in lakes can severely affect these ecosystems. The objective of this article is to present [...] Read more.

An invasive assemblage refers to a group of invasive species that coexist and interact within an ecosystem, significantly altering its dynamics, biodiversity, functions, and ecosystem services. Their presence in lakes can severely affect these ecosystems. The objective of this article is to present an assessment using indexes of socioecological resilience to the impact of an assemblage of two invasive species (P. clarkii and E. crassipes) in a lake ecosystem, the Fúquene Lagoon in Colombia. Socioecological resilience indexes (rating scale: 0.0–100%) are developed based on community perception within the area of influence of the lake ecosystem under study. Indexes are developed for each dimension of analysis (ecological, social, and economic) and include a global resilience index. Community perception is obtained through a survey according to the dimensions of analysis. The results of the comprehensive assessment using the developed indexes suggest significant vulnerability of the ecological (index = 37.7%) and social (index = 40.9%) resilience of the lake ecosystem to the invasive species assemblage. The low-risk perception and limited implementation of preventive measures accentuate this fragility. Although the economic dimension shows greater robustness (index = 56.9%), it is imperative to strengthen the adaptive capacity of the socioecological system to mitigate the adverse impacts of biological invasions and ensure the sustainability of the ecosystem (global resilience index = 45%). Assessing lake ecosystems’ recovery from invasive species requires a multidimensional approach, focusing on ecological, economic, and social factors to develop integrated management strategies for resilience and sustainability. Full article

(This article belongs to the Special Issue Natural and Anthropogenic Conditions of Changes in the Hydrosphere)

► Show Figures

Figure 1

18 pages, 1859 KiB

Open AccessSystematic Review

A Systematic Literature Review of Existing Methods and Tools for the Criticality Assessment of Raw Materials: A Focus on the Relations between the Concepts of Criticality and Environmental Sustainability

by Daniele Perossa, Paolo Rosa and Sergio Terzi

Resources 2024, 13(9), 131; https://doi.org/10.3390/resources13090131 - 18 Sep 2024

Abstract

Critical raw materials have significant economic and social impacts across numerous sectors. Numerous artifacts have been developed to assess their criticality. However, there is no univocity around the factors determining criticality. A systematic literature review was conducted to consider all academic works and [...] Read more.

Critical raw materials have significant economic and social impacts across numerous sectors. Numerous artifacts have been developed to assess their criticality. However, there is no univocity around the factors determining criticality. A systematic literature review was conducted to consider all academic works and official reports on criticality assessment. The review aimed to classify these artifacts to provide a clear picture of the heterogenous literature, with a focus on the relationship between criticality and environmental sustainability. Works proposing or updating criticality assessment artifacts were included according to the eligibility criteria. Academic sources were drawn from the Scopus Database in 2023. Official reports included those considered seminal by academic literature. The risk of bias in the selection and classification of the 162 works was low, as the review sought to be comprehensive. The included artifacts are systematically classified. A mapping of the identified criticality assessment tools and methods has been developed. The review found that while environmental impacts are considered in several works, the theoretical connection between criticality and environmental sustainability is weak. Three perspectives on this relationship are identified and discussed. The main limitation of this study is the inability to analyze undisclosed artifacts. It was conducted under the Horizon Europe Programme (Grant Number 101091490). Full article

(This article belongs to the Special Issue Consideration of Critical and Strategic Raw Materials in Life Cycle Management)

► Show Figures

Figure 1

15 pages, 460 KiB

Open AccessEssay

Global Resources and Resource Justice—Reframing the Socioecological Science-to-Policy Landscape

by Ioan Negrutiu

Resources 2024, 13(9), 130; https://doi.org/10.3390/resources13090130 - 18 Sep 2024

Abstract

The lexical analysis of seminal policy-to-diplomacy documents from the socio-environmental discourse of the last fifty years of agendas has allowed examining the contextual affinities between resources, pollution, and health. The central role of resource stewardship, according to nature’s physical limits, is highlighted in [...] Read more.

The lexical analysis of seminal policy-to-diplomacy documents from the socio-environmental discourse of the last fifty years of agendas has allowed examining the contextual affinities between resources, pollution, and health. The central role of resource stewardship, according to nature’s physical limits, is highlighted in the context of the boundary systems for the biosphere and societies, and the carrying capacity and inclusive systemic health (one health, planetary health, …). To reframe a rather fragmented conceptual and methodological landscape, this work proposes choices that consider core values, purpose, and best practice developments, allowing us to compare the dynamics of socioecological states across the planet and in specific social, economic, political, and cultural contexts. The prioritization of resource justice and responsibility becomes a societal project, embedding the economy in social and ecological frames through institutional reframing and tangible action on resource management, pollution control, and health outcomes. How? By recognizing the primacy of the law and economy of life—the adequacy between basic needs and accessible resources for all— over the rules and economy of the market through socioecosystemic checks and balances. Full article

► Show Figures

Figure 1

15 pages, 2732 KiB

Open AccessArticle

Allometric Models of Aboveground Biomass in Mangroves Compared with Those of the Climate Action Reserve Standard Applied in the Carbon Market

by Carlos Roberto Ávila-Acosta, Marivel Domínguez-Domínguez, César Jesús Vázquez-Navarrete, Rocío Guadalupe Acosta-Pech and Pablo Martínez-Zurimendi

Resources 2024, 13(9), 129; https://doi.org/10.3390/resources13090129 - 17 Sep 2024

Abstract

The standardized methods used in carbon markets require measurement of the biomass and carbon stored in trees, which can be quantified through allometric equations. The objective of this study was to analyze aboveground biomass estimates with allometric models in three mangrove species and [...] Read more.

The standardized methods used in carbon markets require measurement of the biomass and carbon stored in trees, which can be quantified through allometric equations. The objective of this study was to analyze aboveground biomass estimates with allometric models in three mangrove species and compare them with those used by the Climate Action Reserve (CAR) standard. The mangrove forest in Tabasco, Mexico, was certified with the Forest Protocol for Mexico Version 2.0 (FPM) of the CAR standard. Allometric equations for mangrove species were reviewed to determine the most suitable equation for the calculation of biomass. The predictions of the allometric equations of the FPM were analyzed with data from Tabasco from the National Forest and Soil Inventory 2015–2020, and the percentages of trees within the ranges of diameters of the FPM equations were determined. The FPM equations generated higher biomass values for Rhizophora mangle and lower values for Avicennia germinans than the seven equations with which they were compared. In the mangrove swamp of Ejido Úrsulo Galván, Tabasco, 81.8% of the biomass of A. germinans, 34.4% of Laguncularia racemosa and 24.0% of R. mangle were within the diameter range of the FPM equations, and in Tabasco, 28.5% of A. germinans, 16.7% of L. racemosa and 5.7% of R. mangle were within the diameter range. For A. germinans and R. mangle, we recommend using the equation that considers greater maximum diameters. The allometric equations of the FPM do not adequately predict a large percentage of the biomass. Full article

► Show Figures

Figure 1

15 pages, 5509 KiB

Open AccessArticle

Effect of Alkaline and Hydrothermal Pretreatments in Sugars and Ethanol Production from Rice Husk Waste

by José Ayala-Armijos, Byron Lapo, Carolina Beltrán, Joaquín Sigüenza, Braulio Madrid, Estefanía Chérrez, Verónica Bravo and Diana Sanmartín

Resources 2024, 13(9), 128; https://doi.org/10.3390/resources13090128 - 16 Sep 2024

Abstract

This study investigates the effectiveness of hydrothermal and alkaline pretreatment methods in enhancing the concentration of fermentable sugars derived from rice husk waste. After the pretreatments, enzymatic hydrolysis and fermentation processes were executed to evaluate the ethanol production from each pretreatment. Rice husk [...] Read more.

This study investigates the effectiveness of hydrothermal and alkaline pretreatment methods in enhancing the concentration of fermentable sugars derived from rice husk waste. After the pretreatments, enzymatic hydrolysis and fermentation processes were executed to evaluate the ethanol production from each pretreatment. Rice husk powder measuring ≤250 µm was used. For the alkaline pretreatment, sodium hydroxide (NaOH) was used at concentrations ranging from 0.5, 1 to 1.5% w/v. The efficacy of the hydrothermal pretreatment method was evaluated after 15, 30 and 45 min at 120 °C. The enzymatic hydrolysis process was performed over 144 h at 50 °C, pH 4.8 with an enzyme loading of 30 FPU (filter paper units). Fermentation was carried out at 37 °C using a strain of Saccharomyces cerevisiae Hansen 1883 (NCYC 366). Results indicated that the optimal conditions for alkaline pretreatment were observed at a 1.5% NaOH, while the best hydrothermal procedure was achieved at 120 °C and 45 min. The impact of these pretreatments was assessed based on the efficiency of enzymatic hydrolysis. The alkaline pretreatment resulted in 81.70% conversion of cellulose to glucose and 96.30% conversion of hemicellulose to xylose. In contrast, the hydrothermal pretreatment achieved 93% cellulose-to-glucose conversion and 83.35% hemicellulose-to-xylose conversion. The ethanol production registered ranged from 13 to 13.23 g·L−1, corresponding to a conversion factor of 0.43 for ethanol from fermentable sugars. Full article

(This article belongs to the Special Issue Alternative Use of Biological Resources)

► Show Figures

Figure 1

12 pages, 914 KiB

Open AccessCase Report

Greenhouse Gas Emissions Associated with Tree Pruning Residues of Urban Areas of Northeast Brazil

by Yuri Rommel Vieira Araujo, Bartolomeu Israel Souza and Monica Carvalho

Resources 2024, 13(9), 127; https://doi.org/10.3390/resources13090127 - 13 Sep 2024

Abstract

There are environmental concerns (especially regarding climate change) associated with the negative effects of some pruning waste management practices. Converting urban tree waste into valuable products can help mitigate climate change, but it is important to quantify the repercussions of tree waste scenarios [...] Read more.

There are environmental concerns (especially regarding climate change) associated with the negative effects of some pruning waste management practices. Converting urban tree waste into valuable products can help mitigate climate change, but it is important to quantify the repercussions of tree waste scenarios in an urban context. The objective of this study was to quantify the greenhouse gas (GHG) emissions for six scenarios of urban pruning waste in urban areas. To this end, the life cycle assessment methodology was applied to real data obtained from five municipalities of the Paraíba state in 2012–2021 (northeast Brazil). The six scenarios were: sanitary landfill (current practice), sanitary landfill with methane capture, municipal incineration, reuse of wood, heat generation and electricity generation. Considering the 10-year period, the sanitary landfill emitted 1048 kt CO_2e, and when methane was captured at the landfill, emissions decreased to 1033 kt CO_2e. The lowest emissions were associated with electricity generation, with 854 kt CO_2e. The municipality of João Pessoa presented the highest emissions, followed by Cabedelo, Santa Rita, Bayeux, and Conde. Transportation was responsible for the highest share of GHG emissions. Disposal of urban pruning waste at the sanitary landfill presented the highest emissions, and it has been demonstrated herein that pruning waste can be used for the production of bioenergy, with significant potential to mitigate GHG emissions at local levels. Full article

► Show Figures

Figure 1

14 pages, 1634 KiB

Open AccessArticle

Evaluating the Global Processability of Anthropogenic Metals from Mining Waste

by Qudsia Kanwal, Muhammad Saqib Akhtar and Sami G. Al-Ghamdi

Resources 2024, 13(9), 126; https://doi.org/10.3390/resources13090126 - 13 Sep 2024

Abstract

Natural resource depletion and increased mining waste pose significant challenges to global sustainability efforts. This study investigates the processability of mining waste during the metal recovery stage to evaluate its potential contribution to anthropogenic circularity. The mining industry, abundant in valuable metals that [...] Read more.

Natural resource depletion and increased mining waste pose significant challenges to global sustainability efforts. This study investigates the processability of mining waste during the metal recovery stage to evaluate its potential contribution to anthropogenic circularity. The mining industry, abundant in valuable metals that are crucial for a carbon-neutral economy, plays a pivotal role in this context. We determine the grades of metals by looking at their chemical makeup, and then we use statistical entropy to model how easy it is to process certain waste materials. This provides us with processability measures that range from 0.19 bit to 1.18 bit. Our findings highlight that while some waste contains “abundant” metals, its complexity may diminish its economic value, raising concerns about its environmental impacts and resource availability at the end-of-life stages. Estimating potential revenue involves multiplying processed amounts by commodity prices, revealing a maximum value of 8.73 USD/metric ton for processed waste. This assessment underscores the importance of integrating circular economy principles, aiming to mitigate environmental damage and promote industrial ecology. By advancing our understanding of mining waste management through rigorous scientific inquiry, this study contributes to sustainable resource utilization strategies that are essential for future industrial practices and environmental stewardship. Full article

(This article belongs to the Special Issue Mineral Resource Management 2023: Assessment, Mining and Processing)

► Show Figures

Figure 1

13 pages, 2374 KiB

Open AccessArticle

Sustainable Development, Territorial Disparities in Land Resources, and Soil Degradation: A Multi-Temporal Approach

by Marco Maialetti, Luca Salvati and Francesco Maria Chelli

Resources 2024, 13(9), 125; https://doi.org/10.3390/resources13090125 - 6 Sep 2024

Abstract

The present study investigates territorial disparities in selected socioeconomic forces and environmental factors underlying soil degradation that may lead to early desertification processes in a dry Mediterranean region exposed to increasing human pressure. To verify if spatial disparities in land resources have increased [...] Read more.

The present study investigates territorial disparities in selected socioeconomic forces and environmental factors underlying soil degradation that may lead to early desertification processes in a dry Mediterranean region exposed to increasing human pressure. To verify if spatial disparities in land resources have increased over time, a standard approach based on the Environmentally Sensitive Area Index (ESAI) was adopted to evaluate sixty years of territorial transformations in Latium, Central Italy, a region prone to intense processes of land resource depletion. The ESAI provides a standard, holistic assessment of soil degradation based on the estimation of four different ‘resource qualities’ (climate, soil, vegetation, and land use) and their change over sufficiently long time windows; in this study, the procedure was run at three reference years (1960, 1990, and 2020). The observed divergence in soil degradation levels between coastal and inland districts arose during the study period, with a consequent reduction in the local-scale variability of the ESAI. Such differential processes observed along the elevation gradient in Central Italy are likely due to anthropogenic factors affecting land use and leveraging crop intensification in flat districts and farmland abandonment in steep areas. New findings to be achieved in the context of human impacts on land resource depletion are regarded as an original contribution to the study of early desertification processes in advanced economies. Full article

► Show Figures

Figure 1

14 pages, 3610 KiB

Open AccessArticle

Assessment of the Chemical Composition and Antioxidant Capacity of Flowers, Seeds, and Seed Cake of Cactus Pear (Opuntia ficus-indica L.) and Their Application in Biscuits

by Fatiha Brahmi, Amira Oufighou, Leila Smail-Benazzouz, Nouna Hammiche, Lydia Hassaine, Lila Boulekbache-Makhlouf, Khodir Madani and Federica Blando

Resources 2024, 13(9), 124; https://doi.org/10.3390/resources13090124 - 5 Sep 2024

Abstract

Functional ingredients rich in bioactive compounds can be added to conventional ingredients for the formulation of food to increase its nutraceutical potential. Three prickly pear parts, namely flowers, seeds, and seed cake were utilized in the current work as natural antioxidant resources. The [...] Read more.

Functional ingredients rich in bioactive compounds can be added to conventional ingredients for the formulation of food to increase its nutraceutical potential. Three prickly pear parts, namely flowers, seeds, and seed cake were utilized in the current work as natural antioxidant resources. The flower extract gave the best amounts of antioxidants as estimated by spectrophotometric methods, which were 68.08 mg GAE/100 g DM for total phenolics; 6.91 mg QE/100 g DM for total flavonoids; 13.05 mg QE/100 g of DM for flavonols; and 0.22 mg/100 g of DM for condensed tannins. The three extracts showed a high proportion of antioxidant effect as determined by DPPH, ABTS, FRAP, and TAA in vitro assays. Chemical analysis and sensory testing were performed on biscuits that were made by adding powdered flowers, seeds, or seed cake. The biscuits made from the seed cake gave a higher protein content (83.97 mg/100 g) and the biscuits made from the seeds had the best ash concentration (3.21%), while the biscuits containing flower powder had the highest anti-radical activity (81.04%). Sensory analysis disclosed the preference for biscuits formulated with flowers or seeds (80%) by the experts. These findings demonstrated that the nutritional value of the biscuits was improved by their enrichment with cactus parts powders, and they were appreciated by tasters. Full article

► Show Figures

Figure 1

Journal Description

Resources

Latest Articles

Journal Menu

Journal Browser

Highly Accessed Articles

Latest Books

E-Mail Alert

News

Topics

Conferences

Special Issues

Topical Collections

Further Information

Guidelines

MDPI Initiatives

Follow MDPI