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A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Environmental Sustainability and Applications".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 34565

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Special Issue Editor

Dr. Francisco Pedrero Salcedo

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Guest Editor

Maestre-Valero, JF (reprint author), CEBAS CSIC, Campus Univ Espinardo, POB 164, 30100 Murcia, Spain
Interests: irrigation; reclaimed water; sustainable agriculture; salinity; precision agriculture

Special Issue Information

Dear Colleagues,

There has been a decrease in water withdrawals over the past three decades due to population and industrial growth. The use of conventional waters is limited, and the cost of virtual water is too high and not affordable for most developing countries. Therefore, reclaimed water, as a non-conventional water resource, can help provide for a proportion of irrigation water and reduce pressure on conventional water resources.

Although reclaimed water is commonly and successfully used in many countries (e.g., Israel, USA, and Australia), in the EU, water reuse faces numerous barriers. Among them, safety risks, economic concerns, and social acceptance can be currently defined as the main barriers.

For that reason, the purpose of this special issue is to publish high-quality research articles as well as reviews that seek to address recent development on worldwide sustainable water treatment and reuse projects with the creation of a comprehensive database, identifying information and improving the user’s perception and indirectly increasing use of reclaimed water.

Potential topics include but are not limited to the following:

Potential benefits on wastewater treatment and reuse to users
Innovation in desalination and water reclamation.
Renewable energies for water reclamation and desalination.
Emerging technology for minimization and valorization of brine.
New tools for mapping on water reuse projects at regional scale.
Plant and soil field measurements on reclaimed water use in agriculture.
Best practices of water reuse for irrigation.
Industrial urban and environmental water reuse.
Crop response to reclaimed water use and added value of the crops.
Sustainable soil management under reclaimed water irrigation
Cost and benefits of alternative water resources.
Nutrients and fertilizers management using reclaimed water.
Socio-economic impact of water reuse.
Safety aspects of treated wastewater use.
Public perception of water reuse and governance regulations.

Prof. Francisco Pedrero
Guest Editor

Manuscript Submission Information

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Keywords

sustainability
best management practices
reclaimed water use
environment
precision agriculture
public perception
food security
socio-economic value

Published Papers (6 papers)

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Research

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12 pages, 1321 KiB

Open AccessArticle

Research on the Sustainable Heterogeneous Catalyst Development for Photocatalytic Treatment of Phenol

by Zan Li, Hongkun Zhang and Wenrui Jiang

Sustainability 2021, 13(9), 4670; https://doi.org/10.3390/su13094670 - 22 Apr 2021

Cited by 2 | Viewed by 1722

Abstract

A large amount of wastewater from various and discharged sources that are not treated in any way could affect properties of both land and water, causing severe problems for the environment. Advanced oxidation processes seem to be a feasible option to address effluent treatment with regard to salvation of the environment. In this work, a CdO/ZnO/Yb₂O₃ composite composed of trimetallic semiconductors was synthesized through a simple one-pot hydrophile approach at low temperatures and then was employed as a photocatalyst. The degradation of phenol, a common organic persistent pollutant in industrial wastewater, was efficiently catalyzed in the presence of simulated sunlight. It was demonstrated that the synthesized CdO/ZnO/Yb₂O₃ photocatalyst was significantly active after 15 min of reaction and facilitated the effective degradation of the phenol. The CdO/ZnO/Yb₂O₃ photocatalyst achieved 71.5% and 97.81% degradation of the phenol without and with the existence of H₂O₂, correspondingly. The results show that the synthesized composite possesses high oxygen reduction capability and is available for rapid and potent photodegradation of the organic persistent pollutants such as phenol, with minimal damage to the environment. Full article

(This article belongs to the Special Issue Sustainable Wastewater Treatments and Reuse)

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20 pages, 785 KiB

Open AccessArticle

Intervention Strategies on the Wastewater Treatment Behavior of Swine Farmers: An Extended Model of the Theory of Planned Behavior

by Ming-Yeu Wang and Shih-Mao Lin

Sustainability 2020, 12(17), 6906; https://doi.org/10.3390/su12176906 - 25 Aug 2020

Cited by 12 | Viewed by 2931

Abstract

Untreated swine wastewater pollutes rivers and harms the environment. The pollution can be minimized if swine farmers take wastewater treatment (WWT) action before the wastewater is discharged into rivers. Thus, the WWT behavior of swine farmers is key to environmental sustainability. However, WWT behavior, characterized by high costs and inconvenience, has received little attention from previous studies. Due to the high cost, some intervention strategies are helpful in ensuring that farmers behave in a pro-environmental manner. Therefore, this study compares the effects of two intervention factors, i.e., environmental knowledge and perceived effectiveness of enforcement, on the WWT behavior of swine farmers in Taiwan. The comparisons and empirical tests are based on an extended model of the theory of planned behavior (TPB). The findings reveal that all three classic factors in the TPB, i.e., attitude, subjective norms, and perceived behavioral control, had significant and positive effects on the intention of farmers to perform WWT behavior. Contradicting most previous studies, behavioral intentions did not have a significant effect on WWT behavior; however, perceived behavioral control did. The total effects of both intervention factors on WWT behavior were significant and positive. Moreover, the total effect of environmental knowledge was larger than that of the perceived effectiveness of enforcement. The findings suggest that a combination of the two strategies of increasing the environmental knowledge of individuals and enhancing the enforcement of environmental regulations will be helpful in inducing the sustained WWT behavior of farmers. Policy makers can allocate more resources to increasing farmers’ environmental knowledge than to enhancing the enforcement of environmental regulations. Finally, future research directions are discussed. Full article

(This article belongs to the Special Issue Sustainable Wastewater Treatments and Reuse)

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11 pages, 395 KiB

Open AccessArticle

A Comprehensive Evaluation Method for Industrial Sewage Treatment Projects Based on the Improved Entropy-TOPSIS

by Xin Yu, Sid Suntrayuth and Jiafu Su

Sustainability 2020, 12(17), 6734; https://doi.org/10.3390/su12176734 - 20 Aug 2020

Cited by 19 | Viewed by 2509

Abstract

Sewage treatment and reuse have always been hot issues in both the business and academic communities in all nations around the world. In order to solve the difficulties in accurate quantization and objective evaluation of industrial sewage treatment projects, this paper proposed a comprehensive industrial sewage treatment project evaluation method based on the improved entropy–TOPSIS method. First, this paper constructed an evaluation indicator system for sewage treatment projects from the four aspects of environmental performance, economic performance, managerial performance and social performance. Second, it made a modification to the experts’ experience-based grading using the entropy weight method and determined the weight of the indicators in a more objective and more accurate manner. Third, this work improved the traditional TOPSIS method and simplified the calculations with regard to the traditional TOPSIS-based comprehensive evaluation. Finally, by taking the example of evaluating industrial sewage treatment projects of the China Water Affairs Group in Q city (ChongQing), China, this paper verified the feasibility and practicability of the proposed comprehensive industrial sewage treatment project evaluation system and method. Full article

(This article belongs to the Special Issue Sustainable Wastewater Treatments and Reuse)

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16 pages, 2509 KiB

Open AccessFeature PaperArticle

Human Health, Economic and Environmental Assessment of Onsite Non-Potable Water Reuse Systems for a Large, Mixed-Use Urban Building

by Sam Arden, Ben Morelli, Mary Schoen, Sarah Cashman, Michael Jahne, Xin (Cissy) Ma and Jay Garland

Sustainability 2020, 12(13), 5459; https://doi.org/10.3390/su12135459 - 7 Jul 2020

Cited by 13 | Viewed by 5928

Abstract

Onsite non-potable reuse (NPR) is being increasingly considered as a viable option to address water scarcity and infrastructure challenges, particularly at the building scale. However, there are a range of possible treatment technologies, source water options, and treatment system sizes, each with its unique costs and benefits. While demonstration projects are proving that these systems can be technologically feasible and protective of public health, little guidance exists for identifying systems that balance public health protection with environmental and economic performance. This study uses quantitative microbial risk assessment, life cycle assessment and life cycle cost analysis to characterize the human health, environmental and economic aspects of onsite NPR systems. Treatment trains for both mixed wastewater and source-separated graywater were modeled using a core biological process—an aerobic membrane bioreactor (AeMBR), an anaerobic membrane bioreactor (AnMBR) or recirculating vertical flow wetland (RVFW)—and additional treatment and disinfection unit processes sufficient to meet current health-based NPR guidelines. Results show that the graywater AeMBR system designed to provide 100% of onsite non-potable demand results in the lowest impacts across most environmental and human health metrics considered but costs more than the mixed-wastewater version due to the need for a separate collection system. The use of multiple metrics also allows for identification of weaknesses in systems that lead to burden shifting. For example, although the RVFW process requires less energy than the AeMBR process, the RVFW system is more environmentally impactful and costly when considering the additional unit processes required to protect human health. Similarly, we show that incorporation of thermal recovery units to reduce hot water energy consumption can offset some environmental impacts but result in increases to others, including cumulative energy demand. Results demonstrate the need for additional data on the pathogen treatment performance of NPR systems to inform NPR health guidance. Full article

(This article belongs to the Special Issue Sustainable Wastewater Treatments and Reuse)

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18 pages, 1510 KiB

Open AccessArticle

Ecological Sanitation and Sustainable Nutrient Recovery Education: Considering the Three Fixes for Environmental Problem-Solving

by Julian Junghanns and Thomas Beery

Sustainability 2020, 12(9), 3587; https://doi.org/10.3390/su12093587 - 28 Apr 2020

Cited by 8 | Viewed by 3717

Abstract

In the context of phosphorus as a finite resource and the unsustainable character of current sanitation in Europe, this paper examined social factors in a technological transition towards sustainable sanitation. The evaluation is based on the idea of cognitive, structural, and technological fixes to achieve environmental protection. The cognitive fix has been evaluated through literature and a European-wide survey with universities that offer civil and environmental engineering programs. Contrary to an initial hypothesis, ecological sanitation and nutrient recycling are taught by the majority (66%) of responding programs. There are, however, local differences in terms of context and detail of the education. The main impediments for teaching were identified as academic resources (especially in Belgium, Germany and Denmark) and the technological status quo (Ireland, Italy, Spain and some programs of the United Kingdom). Instructors’ personal commitment and experience was evaluated to be a key factor for an extensive coverage of sustainable sanitation in higher education programs. The role of higher education has a critical role to play in changing sanitation practices, given the unique professional developmental stage of students and the potential for a cognitive fix to contribute to meaningful change. Full article

(This article belongs to the Special Issue Sustainable Wastewater Treatments and Reuse)

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Review

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18 pages, 941 KiB

Open AccessReview

Water Scarcity and Wastewater Reuse in Crop Irrigation

by Nicoleta Ungureanu, Valentin Vlăduț and Gheorghe Voicu

Sustainability 2020, 12(21), 9055; https://doi.org/10.3390/su12219055 - 30 Oct 2020

Cited by 187 | Viewed by 16396

Abstract

Due to climate change, two-thirds of mankind will face water scarcity by 2025, while by 2050, global food production must increase by at least 50% to feed 9 billion people. To overcome water scarcity, 15 million m³/day of untreated wastewater is used globally for crop irrigation, polluting the soil with pathogens, heavy metals and excess salts. Since 10% of the global population consumes food from crops irrigated with wastewater, pathogens transmitted through the food chain cause diseases especially in young children and women. In this paper, we discuss the status of water scarcity and the challenges to food security, the reuse of wastewater in agriculture and the possible risks to human and environmental health. The efficiency of different irrigation systems in limiting the risks of wastewater reuse and the latest regulations of the European Commission on effluent recovery are also presented. Hence, we emphasize that irrigation offers real perspectives for large-scale recovery of wastewater, helping to reduce the deficit and conserve water resources, and increasing food safety, with the express mention that investments must be made in wastewater treatment plants and wastewater must be properly treated before recovery, to limit the risks on human health and the environment. Full article

(This article belongs to the Special Issue Sustainable Wastewater Treatments and Reuse)

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