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Article

Towards a Cleaner Textile Industry: Using ASEC to Decrease the Water Footprint to Zero Liquid Discharge

by
Estefanía Bonnail
1,2,
Sebastián Vera
2,
Julián Blasco
3,* and
Tomás Ángel DelValls
2,4
1
Coastal Research Centre, University of Atacama, Avenida Copayapu 485, Copiapó 1530000, Chile
2
Water Challenge S.L., Avenida Papa Negro 63, 28043 Madrid, Spain
3
Instituto de Ciencias Marinas de Andalucía (CSIC), Campus Río de San Pedro, 11510 Puerto Real, Spain
4
Environmental Science and Technology Department, University of Santa Cecilia, Santos 11045-907, Brazil
*
Author to whom correspondence should be addressed.
Water 2023, 15(21), 3781; https://doi.org/10.3390/w15213781
Submission received: 25 August 2023 / Revised: 10 October 2023 / Accepted: 15 October 2023 / Published: 29 October 2023
(This article belongs to the Special Issue Biodiversity and Ecosystem Services in Rivers)
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Abstract

:
Textile manufacturing is the second most polluting industry. It involves a series of processes that require large amounts of water and generates highly polluting wastewater. Four liquid wastes collected at different steps from two different textile factories (synthetic and natural fibers) were treated using a new disruptive technology (Adiabatic Sonic Evaporation and Crystallization—ASEC). After the treatment of the contaminated fluids, the byproducts obtained (freshwater and crystallized solids <1% humidity) were characterized to determine depuration efficiency and their potential commercial reuse. The physicochemical parameters were analyzed in the liquid and solid phases. The results evidence a completely efficient separation of the contaminants and solutes from the liquids analyzed, resulting in 100% pure water with the characteristics of distilled water (an electrical conductivity below 20 µS/cm) suitable for other industrial processes or water reuses, including human consumption. This implies an estimated annual reduction in the water consumption of these factories of between 16 and 103 Olympic pools. It would also avoid the disposal of 181 and 966 ton/y dried residue by the current synthetic and natural fiber textile processing factories, respectively. More than 75% of the resulting solid residue was S from the synthetic fiber industry, and light elements from the natural fiber residues. The installation of ASEC technology in different phases or at the end of industrial textile processing lines could change the paradigm of water consumption to a minimum, thus reducing consumption and resulting in the complete recycling of water. Using renewable energy and residual heat transforms the system into a zero-pollution technology; it makes it possible to attain almost 0% CO2 emissions, fulfilling the European Green Deal objectives such as a circular economy, the decarbonization of the textile industry, the protection of the biodiversity of river basins, and zero pollution.

1. Introduction

The textile industry is one of the oldest, most developed, but most polluting industries [1] in terms of chemicals, water, energy, and the waste decomposer cycle [2]; and it has doubled in the last 20 years [3]. The textile and fashion industries are considered the second most highly polluting industries after the oil industry [4,5], with an environmental footprint that goes from the cultivation of the raw materials and fabric manufacturing to the landfill disposal of consumer items [6]. It is responsible for 10% of human carbon emissions and is the second largest consumer of the world’s water supply [7]. Further, Ref. [8] has estimated that the fashion industry will comprise up to 25% of the world’s carbon budget by 2050. In the production and treatment of natural textile fibers (Nf: alpaca, coconut, wool, cotton, etc.) and synthetic fibers (Sf: nylon/polyester, viscose, spandex, acrylic, etc.), a series of industrial processes are involved that require large amounts of water, generating a huge amount of highly polluting wastewater, which causes significant environmental damage. For example, manufacturing a cotton shirt requires 2700 L of water, and it takes 200 years to decompose [5]. A garment factory processing 8000 kg of cloth a day consumes around 1.6 million L of water (16% is consumed in dyeing, 8% in printing) [9]. The chemical dyeing and finishing processes employ more than 8000 chemicals [9]. The effluent is collectively highly toxic due to the sulfur, naphthol, phthalates, formaldehyde, dimethyl-fumarate (DMF), vat dyes, nitrate, acetic acid, soap, chromium (VI) and nickel compounds, and metals (e.g., Cd, Hg, Ni, Cu, As, Co, and Pb), among others [10,11]. Formaldehyde-based coloring agents, hydrocarbon-based softeners, and non-biodegradable coloring chemicals may be other dangerous chemicals present in the wastewater. Many colorants produce carcinogenic effects due to chlorine [9]. Even some organic textile dyes may cause adverse effects in the form of environmental pollution [12,13]. Sodium hydroxide is used in Nf for dye penetration (“scouring”), and soaps and alkaline solutions are used to remove grease and impurities [14]. Some chemicals are employed to make the textiles more resistant to water, stains, wrinkles, bacteria, or molds [10]. Some other pollutants also originate from the textile industry; i.e., Nf processing implies the release of phytosanitary products [14], and Sf releases a significant quantity of microplastics into the environment [3,15]. In summary, Ref. [14] evaluated the processes used to produce natural and synthetic fibers and their potential environmental impacts, and determined that the issues concerning usage were, primarily, the quality and nature of the chemicals used for laundering or dry cleaning during the products’ lifetime, and other issues relating to disposal.
In Europe, the water from textile processing is normally mixed with domestic urban wastewater residue, and after depuration it is dumped into river basins. According to the European regulations of the Waste Framework Directive 2018/851 [16], by January 2025, each member state should have set up a separate mode of collection for the textile sector, and waste management plans should include the prevention of waste generation. One of the target objectives of the Waste Directive by 2025 is that the preparation for the re-use and recycling of municipal waste should be increased to a minimum of 55% by weight. Therefore, the minimization of contaminants in water is an essential aspect for its re-use and recycling.
Water scarcity, contamination, and the unequal distribution of drinking water are worldwide problems. The aim of the United Nations Sustainable Development Goal 6 is to ensure the availability and sustainable management of sanitation and water for all; therefore, the proper management and exploitation of water resources are urgently required. The objectives of the European Green Deal also include water and the protection of biodiversity in aquatic ecosystems as priority objectives [17]. So, some technologies, such as desalination plants or wastewater treatment plants, are used to obtain water from primary resources, or are depurated; however, they are not completely efficient in recovery [17]. Furthermore, the secondary residues obtained from depuration require costly waste management plans due to the high volumes and their dangerousness (unstable compounds in the aquatic environment). Some byproducts derived from water treatment (sludge), and used as fertilizers, can reach aquifers and rivers, causing pollution, diseases, and adverse effects on the structure of the food supply for water fauna [18]. Although the aim of Directive 2010/75/EU [19] is to prevent pollution and has regulations that apply to industrial installations, they do not apply to diffuse sources of pollution [18].
Nevertheless, an innovative and disruptive technology based on evaporation and crystallization processes conducted in one step under adiabatic conditions and forcing a sonic acceleration of the contaminated fluid was designed for a total recovery of water from liquid residue, obtaining freshwater and crystallized solids as useful byproducts [20]. This process is called Adiabatic Sonic Evaporation and Crystallization (ASEC), which can completely separate water from particulates and dissolved solids. Recently, in [20], the technology was tested with mining residues and showed a 100% efficiency (as distilled water), obtaining valuable crystallized solids for raw material recovery.
This is the first time that depuration technology has been used on samples from liquid textile industry waste, and that the by-products obtained have been characterized. The aim of the current study was to evaluate the efficiency of this active treatment system with regard to the waste from the textile industry. Four samples of industrial liquid waste from two different textile factories and their processes were treated, and the byproducts obtained (pure water and crystallized solids) were characterized. The environmental impact is considered and an economic approach to the revalorized byproducts is presented.

2. Materials and Methods

2.1. Liquid Residues Samples

The scheme of the industrial processes for both synthetic fibers (Sf) and natural fibers (Nf) comprises a series of phases (partially cyclical) that are summarized in Figure 1. For the Sf, different amounts of water at different temperatures are used in baths with glues, detergents, dyes, fixatives, etc. These compounds will be in solution in the output effluent, with a total average volume of 150 m3 used in the industrial process per day. These volumes of liquid waste from the factory are treated at the wastewater treatment plant (WWTP).
Aliquots of three different liquid residue samples were collected from the different phases of the Sf textile processing line (Figure 1a). Sample S1 was water from the preparation phases of the autoclaves. The second sample (S2) was collected from the staining and dyeing phases called jiggers that also contained fluid from the previous treatment. Finally, sample S3 was the effluent from the two previous phases plus residual water sewage from the different facilities of the textile factory collected before going to the WWTP.
In the case of the manufacture of Nf textiles, some of the processes were different (Figure 1b), but they also employed chemicals and treatments (dispersants, surfactants, colorants, etc.). Different dumping pipelines were connected to the WWTP. The fourth sample was collected from the Nf textile manufacturer after all the treatments and together with domestic wastewater before the WWTP (homologous to S3). The daily volume of water consumed by this factory is 950 m3.

2.2. ASEC Technology

The disruptive technology Adiabatic Sonic Evaporation and crystallization (ASEC) was designed (World International Patent Organization: EP3135635) to purify contaminated fluid using a physical approach without the use of chemicals. This occurs by distillation, which results in separate particulate and dissolved solids and liquids based on adiabatic changes and the acceleration of the contaminated fluid to be treated (Figure 2). The results are distilled water and crystallized solid salts. The ASEC process mainly consumes heat instead of electricity. Also, ASEC may use residual heat from the polluting industry, and/or conventional fuel-based energies, and/or classical electricity from the grid. The ASEC process consumes 3–5 kWh/m3 of treated fluid when using renewable energy sources (<1 kWh when using residual heat). The necessary energy may also be produced by renewable energies, such as thermal–solar, photovoltaic panels, etc., or even residual heat originating from other industrial processes [20], which may result in almost 0% of CO2 emissions [21]. Such complete decarbonization of the textile industry, the protection of biodiversity, and zero pollution are among the objectives and goals of the European Green Deal and the U.N.’s Sustainable Development.
Four samples from different processes and factories (S and N) were treated using the ASEC process to verify the efficiency of the technology with liquid waste from different textiles. Therefore, 50 L of each sample of the industrial waste collected from the manufacturing processes (Figure 1) were treated with the ASEC technology (Figure 2). After the treatment of these fluids using ASEC, a total volume of 50 L of clean water S1out was collected, along with a total weight of about 950 g of crystallized solids; a volume of 50 L of clean water S2out and 260 g of crystallized solids were collected after treatment; and finally, around 50 L of distilled water from S3out and 350 g of crystallized solids were collected from the synthetic fiber manufacturing samples. Also, 50 L from the Nf (Nin) factory was treated and the byproducts (Nout) obtained were 50 L of pure water and 200 g of crystallized solids. In all these cases, the percentage of humidity of the crystallized solids was lower than 1.

2.3. Sample Collection and Analyses

Samples of liquid industrial waste (S1in, S2in, S3in, Nin) were collected directly in 1 L amber bottles from the industrial plants, according to Figure 1. Also, 500 mL aliquots of the output liquids (S1out, S2out, S3out, Nout) were collected after the ASEC treatment and acidified (1µL HNO3/mL), and then the elements were analyzed. The concentrations of the elements were determined using an Inductively Coupled Plasma–Mass Spectroscopy (ICP-MS, ICAP-Q, Thermo-Fisher Scientific, Bremen, Germany).
Solid crystalized salt samples were collected with a Teflon spoon and stored in plastic tubes. The samples were characterized using a VantaTM Hanheld (Olympus Scientific Solutions, Waltham, USA) XRF portable analyzer (detection limits: <5 ppm for Mn, Fe, Co, Ni, Zn, Rb, Sr, Nb, Th, Se, Sb; <10 ppm for Cu; <25 ppm for Ca and K; <50 ppm for S and P; <400 ppm Al and Si). Some light elements were presented as a total (H, He, Li, Be, B, C, N, O, F, Ne, Na) [22].
Quality assurance and quality control (QA/QC) were followed by use of certified protocols and laboratories, as detailed in [20].

3. Results and Discussion

3.1. Mass Balance

The volumes of the liquids used as the input of the ASEC processes were completely recovered after the treatments. Volumes of 50 L were supplied to the ASEC equipment, and 50 L of each completely transparent sample was recovered after the treatment (Figure 2) with ~10 mg/L of suspended solids; the pH ranged between 6.87 and 7.01, and the electrical conductivity was 16 µS/cm (Table 1). The crystalized dissolved elements from S1, S2, and S3 had masses of 950, 260, and 350 g, respectively; in other words, a production of 19 g of conglomerates was yielded per liter of S1, while 5.8 g/L was yielded for S2, and 7 g/L for S3. Finally, 4 g of dried solids were obtained per liter of sample.

3.2. Results of the Characterization of the Fluids

The physicochemical parameters of the fluids before and after the treatment are summarized in Table 1. The electrical conductivity (EC) values of the Sf textile liquid waste samples were 11,390, 2000, and 2660 µS/cm for S1, S2, and S3, respectively, but reached the common values of distilled water, lower than 20 µS/cm (16.4 ± 0.2 µS/cm) in all the output samples. The pH was slightly neutralized from 6.66–8.99 to 6.87–7.01 for each of the samples. The values of total suspended solids (TSS) in the incoming effluent from the different steps were 8950 mg/L in S1, 2000 mg/L in S2, and 2660 mg/L in S3, but these were reduced to lower than 10 mg/L after the ASEC treatment. The Cl concentration decreased from 56, 9, and 13 meq/L (for S1, S2, and S3, respectively) to 0.08 meq/L in the output liquid. The reduction in the chemical oxygen demand (COD) after treatment reached the value of 10 mg/L O2. Regarding the concentrations of the metals, complete removal was observed for most of the elements (Cd, Ca, Co, Cu, Cr, and Zn), while others considerably reduced their concentrations. For example, Al registered concentrations between 737 and 4023 µg/L from the input and between 7 and 29 µg/L from the output samples; Mg and Na reduced their concentrations by two orders of magnitude in the treated liquid. In short, the output fluids had the characteristics of distilled water.
The physicochemical parameters of the Nf samples showed the same trend. The EC was reduced from 6670 to 38 µS/cm, the pH was modified from 7.27 to 6.53, and the TSS, chlorides, and sulfates were completely removed in the output water.

3.3. Composition of the Crystallized Solids

The solid crystallized conglomerates collected from the output of the ASEC were characterized chemically (Figure 3). A total of 950 g of crystallized solids collected in S1 were almost 99% S (5879 ± 0.098%), with a probable origin in the surfactants. The crystallized solids from S2 were composed of 71% S (27,800 ppm), followed by Si at 19% (7220 ppm), while 8% was K and Ca in equal measures, and 2% was a cocktail of different elements, such as Fe (1%), Cu, Rb and Co, among others. The composition of the solids in S3 was more heterogeneous: there was 46% S (27,800 ppm), 19% Mg, 19% Al, 8% Si, and 8% other elements, including 3% Ca, 2% P, and others in proportions below 1% (K, Fe, Zn, Cu, Sb, etc.).
Almost three-quarters of the crystallized solids in the solid residue of Nf were light elements [20], comprising 734 g/kg. Magnesium salts made up 8% of the total composition, followed by S (7%).
The estimated crystalized loads recovered from a yearlong ASEC treatment of fluid residues are summarized in Table 2. Using the ASEC process, around 5187 tons of solid residues could be retained from S1, 2370 tons from S2, and 3833 tons from S3, but a greater amount of annual solid residues would be recovered from the natural fiber factory (13,870 tons) than from the synthetic fiber one. The variability and heterogeneity in the compositions of the Sf samples were determined by dilution in the different outlets (Figure 1). For a closer comparison between both factories, the use of last sampling points (S3 for Sf, and N for Nf) would be appropriate; however, the Nf factory uses higher volumes of water than the Sf one. Therefore, in this case, the Nf factory would generate 3.6 times more solid residues than Sf. Due to the high heterogeneity of the salts formed and the inability to recover the elements contained in the solids, together with the presence of impurities in the materials, the best management strategy would be disposal in sanitary deposits. However, the ASEC process would produce a smaller disposal volume than the usual treatment technologies, and therefore represents an easier and cheaper way to manage such waste.
A previous study [23] demonstrated a recovery rate of 77% of water and 66% of NaCl from a briny textile solution using reverse osmosis (RO).

3.4. Revalorization

Previously mentioned authors [6,24,25] stated that the industrial waste generated from manufacturing processes is a potentially enormous source of secondary raw material, which is not used at present even though it could be reintroduced onto the market. Regarding the reuse of water, Ref. [26] has pointed out that water treatment in the textile industry could lead to a reduction of more than 40% in the consumption of freshwater, while the use of the ASEC technology has demonstrated an improvement of up to 100%. Therefore, water with a low mineral content resulting from such treatment could be reused in similar manufacturing processes or other industrial processes, or for agriculture, etc. It could even be safely returned to rivers as a potential measure to restore river basins. The use of the ASEC technology, coupled with the pre-existing systems in these two factories, would annually save the equivalent of 103 Olympic swimming pools for the Nf factory, and 16 for the Sf factory.
Additionally, the resulting crystalized solids could play an important role in the supply of raw materials. Based on the market prices of elements [27,28,29], an estimation of the potential value of the metals recovered is around $ 62 thousand per year for the Sf factory and USD 275 thousand for the Nf factory (Table 3). The element most considered in this estimation is sulfur. Sulfur represented 99, 71 and 46% of the crystallized solids resulting from the treated Sf samples (Figure 3). According to the market overview of 2023 [30], the latest sulfur prices oscillated between USD 169/ton on the European market, and USD 252/ton on the North American market, with intermediate prices on the Asian market. Therefore, the ASEC system coupled to S1 would remove 305 thousand tons of S yearly, which means an economic revalorization of USD 76 million for sulfur extraction from such solid waste (Table 3). In contrast, the solid sample from the Nf factory was composed of 73% of light elements, followed by Mg (8%), and S represented 7% of the total composition (Figure 3). So, sulfur represents a potential economic recovery of USD 243 thousand per year for the Nf industry. However, these estimations are only calculated roughly, and the recovery of elements from these wastes might not be profitable due to the high heterogeneity of the samples; however, the expenses of the metallurgical process of selection, the extraction of elements, and other logistical expenses are not taken into consideration in the calculation of the potential value in this article. But the greatest milestone that deserves to be highlighted in this process is the significant savings in water for both factories, and the condensation of their contaminants, which means that they could be stored and managed more easily and cheaply. Annual recoveries of water and salt from textile RO treatment lead to estimated cost savings regarding water and salt of USD 176,256 and USD 37,000, respectively [23].
The management of hazardous waste includes the collection, recycling, treatment, transportation, disposal, and monitoring of waste disposal sites [31]. Given the new solid state of these chemicals as crystallized salts, the waste processing of such conglomerates could be improved. Chemical separation techniques could be used to sort them into different material fractions for recycling, or pre-sorted waste elements could be processed into secondary raw materials. New (raw) materials might be obtained. Through incineration, the volume could be reduced or energy recovered (anaerobic digestion of organic elements), or this could even be achieved through pyrolysis. In any case, the compaction and reduction in volume leads to a lowering of the expenses for transportation and disposal.
Nanotechnology (nanoparticles, nanocomposites, nanotubes, etc.) look promising in terms of water treatment and recovery in the global textile industry [32]. Some other wastewater depuration strategies in the textile industry are based on the use of the ultrasonic assisted co-precipitation method and nanoparticles, with successful results regarding COD, surfactants, color, and turbidity reduction [33]. Dye solutions might also be removed by strong oxidant species electro-generated on diamond electrodes [34]. We might even use phytoremediation, applied to blended wastewater from the textile industry [35]. Lemna minor is able to reduce COD [36], Lemna gibba L. removes organic dyes [37], and some terrestrial plants can absorb the dyes accumulated in soils [38]. Also, a combined treatment of ultrafiltration and bioremediation has been proven able to remove coloration and reduce the COD [39].
Although these methods and techniques can reach a specific efficiency and thus attain the legal requirements of textile discharges, they are costly, and the residue generated is not economically viable for commerce, while only a few studies consider the reuse of contaminants (e.g., dyes [40]) and water [23]. Also, there are certain emerging pollutants with serious environmental impacts, such as microplastics [41], which are not considered by many depuration processes, so these pollutants are simply dumped into rivers, soils, and ultimately oceans.

3.5. European Critical Raw Materials and European Green Deals

Nowadays, the needs for materials in industries such as the automotive, construction, or chemical in Europe are affected by the demand–supply disruption [42]. The critical raw materials (CRM) have been listed by the European Commission in relation to their economic importance and the supply risk they represent to the EU. CRM are irreplaceable in high-tech products and emerging innovations (solar panels, wind turbines, electric vehicles, etc.), so they play a significant role concerning climate change, and the protection of the environment [43]. The EU elaborated a list of these 14 CRM in 2010 that has been increased to the 34 CRM of today; among them are metals, metalloids and minerals (As, Si, Li, Sb, Be, Bi, Cu, Ga, Ge, Ni, Nb, Sc, Tl, Sr, P, bauxite, feldspar, phosphate rock, natural graphite, etc.) and rare earth elements (heavy and light) [44,45]. Apart from the significant importance of these materials for manufacturing, they also play an important role in the transition toward green technologies, e.g., Nb and Tn are fundamental to reaction engines. China dominates the market for most of the CRMs, and together with Russia, they are the main suppliers of CRMs to Europe [46], but Europe also has reserves of some of these materials, such as Sr, In, Hf, Ga, Si and Ge.
The latest European CRM Act [45] received much criticism for promoting mining extraction. So, the re-exploitation of residues, such as those coming from the textile industry and other industrial wastes, as a source of CRM would be a sustainable choice to secure their supply. It is known that some elements may be recycled with promising recycling rates, such as W (42%), Eu (38%), I (32%) or Sb, Pa and Rh (28%) [44]. The Commission published a report highlighting the potential for a more circular usage of CRMs in the economy [17,43]. Important quantities of different elements were found in the crystallized solids originating from the different samples (Table 2) that might be employed in the construction or chemical industries (305 thousand ton/y of S, 1000 ton/y of Mg, 531 ton/y of Si, etc.), or as trace elements commonly used as catalyzers with greater value (363 kg/y Co, 4300 kg/y Mo, 1000 kg/y Rb).
There is also a need to be aligned with the EU’s climate goals [19], which demand an entirely new perspective on waste as a sustainable source of materials, which is commonly known as the circular strategy [47,48]. Waste reprocessing helps to prevent valuable materials from ending up in landfills by transforming them into secondary raw materials; this means a reduction in the planetary water and carbon footprint. Therefore, is applied to the textile sector, the ASEC technology would cover the following demands of the EU green deals: (i) the demand for green change globally; (ii) the goal of zero pollution for a toxic-free environment by removing contaminants from effluents, and (iii) the preservation of ecosystems and biodiversity (protecting nature), (iv) because it is environmentally friendly and, (v) it can work with clean (renewable), reliable and affordable energy, so it reduces the hydrogen and carbon footprint. Finally, it is able to transform waste into clean water and solids with a potential commercial value (circular economy).

4. Conclusions

The textile industry consumes around 215 billion L of water annually; it is responsible for 8–10% of the emissions of greenhouse gases, and it is expected to grow exponentially in the near future. Furthermore, it is considered the second most polluting industry due to its utilization of colorants, detergents, dispersants, and other residues derived from fabrics, such as microplastics. The current study shows the efficiency of a process for water recuperation in industrial processes and the avoidance of a significant impact on water bodies going from rivers to the ocean, while also contributing to a circular economy. Industrial effluents collected at synthetic and natural fiber textile factories were treated with the new ASEC technology at different steps in the process. The four liquid wastewater samples were completely separated into distilled water (available for new uses, even as drinking water) and four types of conglomerated crystallized solids (<1% humidity), with some potential commercial use after revalorization (46–100% S), especially for the element S associated with Sf factories (potential revenues of up to USD 76 million per year). In the case of Nf, water consumption, which is a much more significant milestone, represented higher recovery volumes (320,000 m3/year for this particular factory). But the revalorization of the solids was not recommended because the resulting salts were too heterogeneous (73% light elements, 8% Mg, 7% S).
For both factories, the installation of the ASEC technology could change the paradigm of water consumption to the minimum, and allow for complete water recycling (volumes of 16 and 103 Olympic pools were the annual savings). In the case of the solid residue, the resulting safety and reduction in volume would reduce expenses in waste management (annual removal of 181 and 966 ton/y of dried residue). The ASEC technology could function as a hub for the transition to efficient water use for the global textile industry. It would achieve important key milestones in these two factories: zero liquid discharges; vast reusable volumes of water, and the avoidance of the contamination of water bodies (zero contaminant discharges to the environment). These are the objectives of the European Green Deal (clean and circular economy, protection of nature, green change, and elimination of pollution) and the United Nations Sustainable Development Goals. Industries would benefit from important economic savings such as water usage, residue management, and the possibility to obtain new sustainability awards.

Author Contributions

E.B. and T.Á.D. were involved in all aspects of the manuscript such as conceptualization, methodology, software, validation, formal analysis, investigation, resources, data curation, writing, reviewing and editing, visualization, supervision, project administration and funding acquisition. S.V. was involved in most of the aspects such as conceptualization, methodology, software, validation, formal analysis, investigation, resources, writing, reviewing and editing, visualization, supervision, project administration and funding acquisition. J.B. was involved in validation, investigation, writing, reviewing and editing, visualization and supervision. All authors have read and agreed to the submitted version of the manuscript.

Funding

This study has been partially funded by ASEC Grant #190180588 through EU EIC/Accelerator Horizon _Europe 2022 call. E. Bonnail thanks ANID/CONICYT/FONDECYT 11180015 and T.A. DelValls also thanks CNPq (#305734/2018-0) for productivity fellowships.

Data Availability Statement

Data are not available.

Acknowledgments

The authors thank the Water Challenge S.L. technical team for all the activities conducted during the study in the ASEC plant and the technical and laboratory staff from the ICMAN-CSIC.

Conflicts of Interest

The authors declare no conflict of interest.

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Water 15 03781 g001
Figure 1. (a) Schemes of the synthetic (Sf) and (b) natural fiber (Nf) textile manufacturing processes and the sampling points in the manufacturing processes (S1, S2 and S3 for synthetic fibers and Nf for natural fibers).
Figure 1. (a) Schemes of the synthetic (Sf) and (b) natural fiber (Nf) textile manufacturing processes and the sampling points in the manufacturing processes (S1, S2 and S3 for synthetic fibers and Nf for natural fibers).
Water 15 03781 g001
Water 15 03781 g002
Figure 2. ASEC design global working scheme, the mass balance and pictures of synthetic (S) and natural (N) fiber manufacturing samples before (-in) and after the treatment (-out).
Figure 2. ASEC design global working scheme, the mass balance and pictures of synthetic (S) and natural (N) fiber manufacturing samples before (-in) and after the treatment (-out).
Water 15 03781 g002
Water 15 03781 g003
Figure 3. Composition of elements in percentages (%, left) and concentrations (ppm, on the logarithmic scale, right) of the crystallized solids collected using the ASEC technology for the synthetic (S1out, S2out, S3out) and natural fibers samples treated (LE: light elements).
Figure 3. Composition of elements in percentages (%, left) and concentrations (ppm, on the logarithmic scale, right) of the crystallized solids collected using the ASEC technology for the synthetic (S1out, S2out, S3out) and natural fibers samples treated (LE: light elements).
Water 15 03781 g003
Table 1. Physicochemical analysis results for the untreated (S1in, S2in, S3in, Nin) and the treated fluids (S1out, S2out, S3out, Nout) using the ASEC technology.
Table 1. Physicochemical analysis results for the untreated (S1in, S2in, S3in, Nin) and the treated fluids (S1out, S2out, S3out, Nout) using the ASEC technology.
InputOutput
UnitsS1inS2inS3inNinS1outS2outS3outNout
ECµS/cm11,39020002660667016.216.716.338.1
T°C24.324.423.925.424.724.425.125.3
pH 6.668.997.437.276.876.807.016.53
CODmg/LO28950306939606900<10<10<10<10
TSSmg/L717020002660420010.210.510.39.99
Chloridesmeq/L56.139.8613.1118.310.080.080.080.06
Sulphatesmg/L~8000200~400>200<25<25<25<25
Elements
Alµg/L80180634023117n.d.n.d.n.d.n.d.
Cdµg/L7.80n.dn.d0.2n.d.n.d.n.d.n.d.
Camg/L19991463103510.9n.d.n.d.n.d.n.d.
Coµg/L15414.21693.2n.d.n.d.n.d.n.d.
Cuµg/L763241735197n.d.n.d.n.d.n.d.
Crµg/L23.47.0017.2110n.d.n.d.n.d.n.d.
Mgµg/L41521562296640,842<5n.d.<5<5
Namg/L417970241771951<5<5<5<5
Znµg/L13,833258124275<20<20<20n.d.
Liµg/L14.612519244.4n.d.n.d.n.d.n.d.
Kmg/L12.511.47.7892.6<0.1<0.1<0.1<0.1
Feµg/L370105741888.9n.d.n.d.n.d.n.d.
Niµg/L41910.611.03.2n.d.n.d.n.d.n.d.
Asµg/L0.751.546,333.60n.d.n.d.n.d.n.d.
Srµg/L33.518.792.4803n.d.n.d.n.d.n.d.
Yµg/L14.137.31383.00n.d.n.d.n.d.n.d.
Csµg/L36.490.01620.26n.d.n.d.n.d.n.d.
Baµg/L6.8417.822.499.5n.d.n.d.n.d.n.d.
Laµg/L41.447.451.30.19n.d.n.d.n.d.n.d.
Ceµg/L81.747.287.1n.dn.d.n.d.n.d.n.d.
Prµg/L13.112.115.30.10n.d.n.d.n.d.n.d.
Ndµg/L66.660.21010.20n.d.n.d.n.d.n.d.
Smµg/L8.5814.65.550.10n.d.n.d.n.d.n.d.
Gdµg/L4.7320.03.410.56n.d.n.d.n.d.n.d.
Dyµg/L9.8037.75.150.10n.d.n.d.n.d.n.d.
Erµg/L16.320.42.710.10n.d.n.d.n.d.n.d.
Ybµg/L14.130.123.10.46n.d.n.d.n.d.n.d.
Pbµg/L2.146.445.750.15n.d.n.d.n.d.n.d.
Note: n.d.: not detected.
Table 2. The yearly metal load estimated for the different conglomerate salts collected for the different fluids.
Table 2. The yearly metal load estimated for the different conglomerate salts collected for the different fluids.
S1S2S3N
Ston304,96666181963
Siton17.517.132.3531
Caton5.53.410.8416
Kton 3.65.5371
Mgton 761080
Alton 75251
Pton 43
Sbton 5.5
∑Light elementston 10,194
Cokg363149123
Cukg6382657284771
Fekg55549720703336
Mokg1666977
Nbkg933331
Nikg22312177
Rbkg1048194506506
Sekg623123
Srkg5228732725
Znkg8746100718051616
Thkg285 84
Mnkg 330
Table 3. Estimated potential valuation (in USD/year) of the elements of economic interest contained in the crystallized solids obtained using the ASEC technology for the synthetic factory (S1, S2, S3) and natural fiber textile factory (N).
Table 3. Estimated potential valuation (in USD/year) of the elements of economic interest contained in the crystallized solids obtained using the ASEC technology for the synthetic factory (S1, S2, S3) and natural fiber textile factory (N).
S1S2S3N
S76,85116,59645,585242,744
Co10,89344773679-
Cu38281592436928,628
Mo431617861993-
Nb503317881653-
Ni28771559989-
Se1152570425-
Zn17,492201436103232
Total76,897,04130,38062,303274,604
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Bonnail, E.; Vera, S.; Blasco, J.; DelValls, T.Á. Towards a Cleaner Textile Industry: Using ASEC to Decrease the Water Footprint to Zero Liquid Discharge. Water 2023, 15, 3781. https://doi.org/10.3390/w15213781

AMA Style

Bonnail E, Vera S, Blasco J, DelValls TÁ. Towards a Cleaner Textile Industry: Using ASEC to Decrease the Water Footprint to Zero Liquid Discharge. Water. 2023; 15(21):3781. https://doi.org/10.3390/w15213781

Chicago/Turabian Style

Bonnail, Estefanía, Sebastián Vera, Julián Blasco, and Tomás Ángel DelValls. 2023. "Towards a Cleaner Textile Industry: Using ASEC to Decrease the Water Footprint to Zero Liquid Discharge" Water 15, no. 21: 3781. https://doi.org/10.3390/w15213781

APA Style

Bonnail, E., Vera, S., Blasco, J., & DelValls, T. Á. (2023). Towards a Cleaner Textile Industry: Using ASEC to Decrease the Water Footprint to Zero Liquid Discharge. Water, 15(21), 3781. https://doi.org/10.3390/w15213781

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