Pub Date : 2025-06-24DOI: 10.1021/acsestengg.5c00163
Tae Hyun Chung, Simran Kaur Dhillon, Anindya Amal Chakrabarty and Bipro Ranjan Dhar*,
Biogas upgrading based on the principle of the microbial electrosynthesis (MES) system offers a promising avenue for biogas upgrading. Here, we explored 4 different combinations of cathode and membrane materials to optimize MES for biogas upgrading. MES equipped with a stainless steel cathode and Nafion 117 membrane (designated as MES-2) demonstrated optimal performance, achieving a maximum methane production of 268.5 ± 19.5 Lmethane/mcathode3 with a bicarbonate medium. Furthermore, MES-2 showed superior performance with a CO2-rich gas (70% CO2 and 30% N2), achieving 100% CO2 conversion to methane conversion after 3 days of gas recirculation. When testing different biogas sources (synthetic and real anaerobic digestion biogas), MES-2 also consistently provided >99% methane content within a relatively short time (<3 days) of biogas recirculation. Additionally, H2S content was significantly reduced from 214 ppmv to <1 ppmv, enabling the upgraded biogas to be widely utilized in various applications. The microbial community analysis indicated that this outcome was primarily due to the substantial growth of chemolithoautotrophic sulfide-oxidizing bacteria, such as Thiobacillus, which likely converted sulfide to elemental sulfur and/or sulfate. This study underscores the potential of MES as a highly effective and uniquely adaptable technology for biogas upgrading and desulfurization, promoting sustainable energy practices.
{"title":"Simultaneous Biogas Upgrading and Desulfurization Using a Microbial Electrosynthesis System with Optimized Electrodes and Membrane Selection","authors":"Tae Hyun Chung, Simran Kaur Dhillon, Anindya Amal Chakrabarty and Bipro Ranjan Dhar*, ","doi":"10.1021/acsestengg.5c00163","DOIUrl":"https://doi.org/10.1021/acsestengg.5c00163","url":null,"abstract":"<p >Biogas upgrading based on the principle of the microbial electrosynthesis (MES) system offers a promising avenue for biogas upgrading. Here, we explored 4 different combinations of cathode and membrane materials to optimize MES for biogas upgrading. MES equipped with a stainless steel cathode and Nafion 117 membrane (designated as MES-2) demonstrated optimal performance, achieving a maximum methane production of 268.5 ± 19.5 L<sub>methane</sub>/m<sub>cathode</sub><sup>3</sup> with a bicarbonate medium. Furthermore, MES-2 showed superior performance with a CO<sub>2</sub>-rich gas (70% CO<sub>2</sub> and 30% N<sub>2</sub>), achieving 100% CO<sub>2</sub> conversion to methane conversion after 3 days of gas recirculation. When testing different biogas sources (synthetic and real anaerobic digestion biogas), MES-2 also consistently provided >99% methane content within a relatively short time (<3 days) of biogas recirculation. Additionally, H<sub>2</sub>S content was significantly reduced from 214 ppmv to <1 ppmv, enabling the upgraded biogas to be widely utilized in various applications. The microbial community analysis indicated that this outcome was primarily due to the substantial growth of chemolithoautotrophic sulfide-oxidizing bacteria, such as <i>Thiobacillus</i>, which likely converted sulfide to elemental sulfur and/or sulfate. This study underscores the potential of MES as a highly effective and uniquely adaptable technology for biogas upgrading and desulfurization, promoting sustainable energy practices.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 9","pages":"2224–2237"},"PeriodicalIF":6.7,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-06-19DOI: 10.1021/acsestengg.5c00342
Xinrui Lin, Zhipeng Xu, Feng Lin, Peizu Ruan, Ting Li, Shiying Chen, Qidong Yin*, Kai He* and Shanquan Wang,
The widespread occurrence of antibiotics in aquatic environments poses serious ecological and public health risks, necessitating advanced treatment strategies. Biohydrogels present a versatile platform for enhancing the removal of sulfamethoxazole (SMX) by combining adsorption with microbial degradation. In this study, polyvinyl alcohol-sodium alginate (PVA-SA) hydrogels were used to immobilize anaerobic sludge, forming two hydrogel systems (gel7.5 and gel9) with distinct physical structures. Both systems achieved significantly higher SMX removal efficiencies (90.2 and 87.7%) compared with the control (67.7%). Metagenomic analysis revealed differential enrichment of key SMX-degrading genera, with Lentimicrobium dominant in gel7.5 and Pseudomonas and Acinetobacter enriched in gel9. Functional gene profiling further indicated that gel7.5 and gel9 favored distinct monooxygenase pathways for SMX transformation. These results demonstrate that the hydrogel composition shapes microbial community function and biodegradation mechanisms, offering an effective and adaptable solution for treating antibiotic-contaminated wastewater while mitigating the risk of resistance gene dissemination.
{"title":"Encapsulated Hydrogels Enhance Sulfamethoxazole Removal via Structure-Driven Microbial Metabolisms","authors":"Xinrui Lin, Zhipeng Xu, Feng Lin, Peizu Ruan, Ting Li, Shiying Chen, Qidong Yin*, Kai He* and Shanquan Wang, ","doi":"10.1021/acsestengg.5c00342","DOIUrl":"https://doi.org/10.1021/acsestengg.5c00342","url":null,"abstract":"<p >The widespread occurrence of antibiotics in aquatic environments poses serious ecological and public health risks, necessitating advanced treatment strategies. Biohydrogels present a versatile platform for enhancing the removal of sulfamethoxazole (SMX) by combining adsorption with microbial degradation. In this study, polyvinyl alcohol-sodium alginate (PVA-SA) hydrogels were used to immobilize anaerobic sludge, forming two hydrogel systems (gel7.5 and gel9) with distinct physical structures. Both systems achieved significantly higher SMX removal efficiencies (90.2 and 87.7%) compared with the control (67.7%). Metagenomic analysis revealed differential enrichment of key SMX-degrading genera, with <i>Lentimicrobium</i> dominant in gel7.5 and <i>Pseudomonas</i> and <i>Acinetobacter</i> enriched in gel9. Functional gene profiling further indicated that gel7.5 and gel9 favored distinct monooxygenase pathways for SMX transformation. These results demonstrate that the hydrogel composition shapes microbial community function and biodegradation mechanisms, offering an effective and adaptable solution for treating antibiotic-contaminated wastewater while mitigating the risk of resistance gene dissemination.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 9","pages":"2401–2412"},"PeriodicalIF":6.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-06-17DOI: 10.1021/acsestengg.5c00362
Hong Chen, Yifei Sun, Helena I. Gomes, Zhang Lin* and Jingyun Fang*,
{"title":"Low-Carbon Resource Utilization and Pollution Control of Solid Wastes","authors":"Hong Chen, Yifei Sun, Helena I. Gomes, Zhang Lin* and Jingyun Fang*, ","doi":"10.1021/acsestengg.5c00362","DOIUrl":"https://doi.org/10.1021/acsestengg.5c00362","url":null,"abstract":"","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 7","pages":"1608–1610"},"PeriodicalIF":6.7,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144808324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lynn R. Terry, Manan Jain, Jacob W. Kruel, Anupam Das, Priyanka Sharma, Benjamin S. Hsiao and Huiyuan Guo*,
{"title":"","authors":"Lynn R. Terry, Manan Jain, Jacob W. Kruel, Anupam Das, Priyanka Sharma, Benjamin S. Hsiao and Huiyuan Guo*, ","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":7.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsestengg.4c00945","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144423815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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