Pub Date : 2025-10-06DOI: 10.1080/10643389.2025.2566174
Tong Sun, Yiwei Cai, Peng Huang, Guiying Li, Po Keung Wong, Taicheng An
Natural environmental conditions fluctuate randomly, with various factors influencing multiple aspects of the microorganisms that live in them. In adverse environmental conditions, microorganisms can enter dormant states with low metabolic activities, which is a survival strategy for them to adapt to deleterious environmental changes. Small colony variant (SCV) state is one of the dormant states; the size of SCV colonies is nearly one-tenth that of those of wild-type (WT) parental bacteria. This review used scientometric analysis to summarize relevant publications on SCVs. SCV physiological characteristics modified by changes in cell size, as well as induction conditions and mechanisms, detection technologies, and elimination methods in natural environments, were systematically reviewed. Interactions between SCVs and other coexisting microorganisms are also discussed. The emergence of SCVs ensures the survival of bacterial communities by providing metabolic and competitive protection; however, they also pose a potential threat to ecosystems and human health. For example, pathogens may enter the SCV state and move across geographical space along with their host’s geographical movements. Future research directions related to the transmission and control of SCVs in the natural environment are also highlighted. This review expands the understanding of the living states of microorganisms in natural environments and reveals the effects of SCVs on the evolution and persistence of both individual microorganisms and microbial populations.
{"title":"Microbial dormancy evolution in the environments: Environmental adaptation and health risks of small colony variants","authors":"Tong Sun, Yiwei Cai, Peng Huang, Guiying Li, Po Keung Wong, Taicheng An","doi":"10.1080/10643389.2025.2566174","DOIUrl":"https://doi.org/10.1080/10643389.2025.2566174","url":null,"abstract":"Natural environmental conditions fluctuate randomly, with various factors influencing multiple aspects of the microorganisms that live in them. In adverse environmental conditions, microorganisms can enter dormant states with low metabolic activities, which is a survival strategy for them to adapt to deleterious environmental changes. Small colony variant (SCV) state is one of the dormant states; the size of SCV colonies is nearly one-tenth that of those of wild-type (WT) parental bacteria. This review used scientometric analysis to summarize relevant publications on SCVs. SCV physiological characteristics modified by changes in cell size, as well as induction conditions and mechanisms, detection technologies, and elimination methods in natural environments, were systematically reviewed. Interactions between SCVs and other coexisting microorganisms are also discussed. The emergence of SCVs ensures the survival of bacterial communities by providing metabolic and competitive protection; however, they also pose a potential threat to ecosystems and human health. For example, pathogens may enter the SCV state and move across geographical space along with their host’s geographical movements. Future research directions related to the transmission and control of SCVs in the natural environment are also highlighted. This review expands the understanding of the living states of microorganisms in natural environments and reveals the effects of SCVs on the evolution and persistence of both individual microorganisms and microbial populations.","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"51 1","pages":"1-23"},"PeriodicalIF":12.6,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-06DOI: 10.1080/10643389.2025.2563346
Nan Huang, De-Xiu Wu, Ye Du, Yan-Lin Chen, Qian-Yuan Wu, Hong-Ying Hu
Non-oxidizing antimicrobials (NOAMs) provide long-lasting microbial control without reacting with other components or causing equipment corrosion, yet their environmental and health risks are often overlooked. Common NOAMs include quaternary ammonium compounds (QACs), aldehydes, isothiazolinones, azoles, and biguanides. They are widely used in households, healthcare, industry, water treatment, and agriculture, entering the environment through wastewater, hospital/industrial sources, and urban/agricultural runoff. NOAM concentrations can reach mg/L in hospital/industrial wastewater and reverse osmosis (RO) concentrate. NOAMs have been detected globally in surface waters, sediments, and sewage sludge, with median concentrations of 0.01–0.1 μg/L, 3.2–12 μg/kg, and 5–7562 μg/kg, respectively. Risks associated with NOAMs include increased antibiotic resistance, ecotoxicity to aquatic organisms, and potential health hazards. Exposure to sub-inhibitory concentrations of QACs, cetrimide, or chlorhexidine can enhance resistance to other NOAMs and antibiotics by 1.3 to over 100 times. NOAMs exhibit comparable or higher ecotoxicity to luminescent bacteria, algae, daphnids, and fish compared to personal care products (PPCPs) and disinfection by-products (DBPs). NOAMs like QACs, isothiazolinones, and carbendazim can cause skin allergies, liver inflammation, fibrosis, or neuronal damage via multiple exposure routes. Most NOAMs require several weeks or more for complete biodegradation. NOAMs and PPCPs show similar biodegradability, both being less biodegradable than DBPs. Ozone reacts with QACs, carbendazim, and chloromethylisothiazolinone (CMIT) at rates below 10 M−1s−1. Hydroxyl radicals react rapidly with NOAMs (>109 M−1s−1), while sulfate radical reactions with NOAMs are poorly understood. Future research requires expanded environmental monitoring, multi-endpoint toxicity assessments, resistance mechanisms under high NOAM pressure, and advanced disposal strategies.
{"title":"Overlooked risks of non-oxidizing antimicrobials (NOAMs) in water environments","authors":"Nan Huang, De-Xiu Wu, Ye Du, Yan-Lin Chen, Qian-Yuan Wu, Hong-Ying Hu","doi":"10.1080/10643389.2025.2563346","DOIUrl":"https://doi.org/10.1080/10643389.2025.2563346","url":null,"abstract":"Non-oxidizing antimicrobials (NOAMs) provide long-lasting microbial control without reacting with other components or causing equipment corrosion, yet their environmental and health risks are often overlooked. Common NOAMs include quaternary ammonium compounds (QACs), aldehydes, isothiazolinones, azoles, and biguanides. They are widely used in households, healthcare, industry, water treatment, and agriculture, entering the environment through wastewater, hospital/industrial sources, and urban/agricultural runoff. NOAM concentrations can reach mg/L in hospital/industrial wastewater and reverse osmosis (RO) concentrate. NOAMs have been detected globally in surface waters, sediments, and sewage sludge, with median concentrations of 0.01–0.1 μg/L, 3.2–12 μg/kg, and 5–7562 μg/kg, respectively. Risks associated with NOAMs include increased antibiotic resistance, ecotoxicity to aquatic organisms, and potential health hazards. Exposure to sub-inhibitory concentrations of QACs, cetrimide, or chlorhexidine can enhance resistance to other NOAMs and antibiotics by 1.3 to over 100 times. NOAMs exhibit comparable or higher ecotoxicity to luminescent bacteria, algae, daphnids, and fish compared to personal care products (PPCPs) and disinfection by-products (DBPs). NOAMs like QACs, isothiazolinones, and carbendazim can cause skin allergies, liver inflammation, fibrosis, or neuronal damage <i>via</i> multiple exposure routes. Most NOAMs require several weeks or more for complete biodegradation. NOAMs and PPCPs show similar biodegradability, both being less biodegradable than DBPs. Ozone reacts with QACs, carbendazim, and chloromethylisothiazolinone (CMIT) at rates below 10 M<sup>−1</sup>s<sup>−1</sup>. Hydroxyl radicals react rapidly with NOAMs (>10<sup>9</sup> M<sup>−1</sup>s<sup>−1</sup>), while sulfate radical reactions with NOAMs are poorly understood. Future research requires expanded environmental monitoring, multi-endpoint toxicity assessments, resistance mechanisms under high NOAM pressure, and advanced disposal strategies.","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"15 1","pages":"1-24"},"PeriodicalIF":12.6,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-06DOI: 10.1080/10643389.2025.2566941
Yongyi Ma, Qianqian Li, Guijin Su, Huangnan Duan, Tieyu Wang, Jong Seong Khim, Seongjin Hong, Bohua Sun, Jing Meng, Bin Shi
Chlorinated paraffins (CPs), especially short-chain (SCCPs) and medium-chain (MCCPs) homologues, have become a global concern due to their highly toxic and persistent. However, there remains a limited and fragmented understanding of their distribution and hotspots across diverse environmental matrices worldwide, and research on effective control measures is even more deficient. This study investigated the global occurrence of CPs in multiple environmental matrices and reviewed existing degradation technologies. Emissions from industrial activities, product usage and environmental matrices exchanges have led to widespread CPs contamination mainly encompassing SCCPs and MCCPs, with average concentrations of 10−3–103 ng/m3 in atmosphere, 10–103 ng/L in water and 1–105 ng/g dw in sediment, as well as 1–106 ng/g dw in soil. In contrast, data on long-chain CPs (LCCPs) remain extremely limited. The available long-term atmospheric monitoring demonstrated both the effectiveness of regulatory controls and the delayed environmental response due to long-range atmospheric transport. The environmental migration of CPs is strongly influenced by carbon chain length and degree of chlorination. Current degradation technologies primarily focus on pyrolysis, photolysis, photocatalysis, microbial degradation, and phytoremediation. Mechanisms and efficiency analyses revealed that major challenges include by-products and the limited scalability of technologies beyond laboratory settings. By systematically linking contaminations profiles to suitable treatment options, we proposed a targeted CPs pollution remediation strategy. These insights aim to advance global CPs government and support the implementation of the Stockholm Convention.
{"title":"Occurrence and remediation of chlorinated paraffins in global environmental matrices: Levels, trends, and future prospects","authors":"Yongyi Ma, Qianqian Li, Guijin Su, Huangnan Duan, Tieyu Wang, Jong Seong Khim, Seongjin Hong, Bohua Sun, Jing Meng, Bin Shi","doi":"10.1080/10643389.2025.2566941","DOIUrl":"https://doi.org/10.1080/10643389.2025.2566941","url":null,"abstract":"Chlorinated paraffins (CPs), especially short-chain (SCCPs) and medium-chain (MCCPs) homologues, have become a global concern due to their highly toxic and persistent. However, there remains a limited and fragmented understanding of their distribution and hotspots across diverse environmental matrices worldwide, and research on effective control measures is even more deficient. This study investigated the global occurrence of CPs in multiple environmental matrices and reviewed existing degradation technologies. Emissions from industrial activities, product usage and environmental matrices exchanges have led to widespread CPs contamination mainly encompassing SCCPs and MCCPs, with average concentrations of 10<sup>−3</sup>–10<sup>3</sup> ng/m<sup>3</sup> in atmosphere, 10–10<sup>3</sup> ng/L in water and 1–10<sup>5</sup> ng/g dw in sediment, as well as 1–10<sup>6</sup> ng/g dw in soil. In contrast, data on long-chain CPs (LCCPs) remain extremely limited. The available long-term atmospheric monitoring demonstrated both the effectiveness of regulatory controls and the delayed environmental response due to long-range atmospheric transport. The environmental migration of CPs is strongly influenced by carbon chain length and degree of chlorination. Current degradation technologies primarily focus on pyrolysis, photolysis, photocatalysis, microbial degradation, and phytoremediation. Mechanisms and efficiency analyses revealed that major challenges include by-products and the limited scalability of technologies beyond laboratory settings. By systematically linking contaminations profiles to suitable treatment options, we proposed a targeted CPs pollution remediation strategy. These insights aim to advance global CPs government and support the implementation of the Stockholm Convention.","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"53 1","pages":"1-27"},"PeriodicalIF":12.6,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-14DOI: 10.1080/10643389.2025.2560435
Yueyan Zhang, Jun Sasaki, Ang Li, Jundong Chen
Microbial remediation is crucial in environmental pollution control. However, targeted intervention is challenging due to the complex and dynamic interactions between microbial communities and external stressors. Machine learning (ML) can be used to deeply analyze the connections between microbial processes and contaminant removal through data mining. Microbial remediation lies at the intersection of microbiology and environmental science, with its diverse scope offering high flexibility for ML applications. Despite the potential of ML, limited attention has been given to its applications within this specific field, and there is a lack of structured reviews to guide the development of ML frameworks in microbial remediation. This review examines the role and current status of ML in microbial remediation. Application modes are presented and compared with a clear hierarchy, including initial monitoring, strategy formulation, and system design. It provides access to established frameworks and alternative solutions to address relevant challenges. Two primary application modes are identified among the seemingly diverse approaches: mapping-based inference and importance-based identification of key agents. The first mode establishes a mapping between two causally linked datasets to predict various outcomes such as remedial effects and microbial growth. Accordingly, the second mode identifies predictors that significantly contribute to mapping accuracies as key microbes or environmental variables. Emerging issues related to the limited accessibility and interpretability are discussed. Finally, using multi-modal learning for pipeline development and applying knowledge graphs (KGs) and a deep reinforcement learning framework to enhance interpretability are proposed as promising solutions.
{"title":"Application and challenges of machine learning in microbial remediation: A review of current status and future directions","authors":"Yueyan Zhang, Jun Sasaki, Ang Li, Jundong Chen","doi":"10.1080/10643389.2025.2560435","DOIUrl":"https://doi.org/10.1080/10643389.2025.2560435","url":null,"abstract":"Microbial remediation is crucial in environmental pollution control. However, targeted intervention is challenging due to the complex and dynamic interactions between microbial communities and external stressors. Machine learning (ML) can be used to deeply analyze the connections between microbial processes and contaminant removal through data mining. Microbial remediation lies at the intersection of microbiology and environmental science, with its diverse scope offering high flexibility for ML applications. Despite the potential of ML, limited attention has been given to its applications within this specific field, and there is a lack of structured reviews to guide the development of ML frameworks in microbial remediation. This review examines the role and current status of ML in microbial remediation. Application modes are presented and compared with a clear hierarchy, including initial monitoring, strategy formulation, and system design. It provides access to established frameworks and alternative solutions to address relevant challenges. Two primary application modes are identified among the seemingly diverse approaches: mapping-based inference and importance-based identification of key agents. The first mode establishes a mapping between two causally linked datasets to predict various outcomes such as remedial effects and microbial growth. Accordingly, the second mode identifies predictors that significantly contribute to mapping accuracies as key microbes or environmental variables. Emerging issues related to the limited accessibility and interpretability are discussed. Finally, using multi-modal learning for pipeline development and applying knowledge graphs (KGs) and a deep reinforcement learning framework to enhance interpretability are proposed as promising solutions.","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"22 1","pages":""},"PeriodicalIF":12.6,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-21DOI: 10.1080/10643389.2025.2530941
Tian Gao, Yi Li, Nan Yang, Wei Xiong, Xiaodan Liang, Yingjie Wang
{"title":"Plant-rhizosphere microbe interactions and their roles in nitrogen cycles under periodic flooding: From cooperation mechanisms to ecological responses","authors":"Tian Gao, Yi Li, Nan Yang, Wei Xiong, Xiaodan Liang, Yingjie Wang","doi":"10.1080/10643389.2025.2530941","DOIUrl":"https://doi.org/10.1080/10643389.2025.2530941","url":null,"abstract":"","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"212 1","pages":""},"PeriodicalIF":12.6,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-18DOI: 10.1080/10643389.2025.2484889
Maria Jose Jimenez Vizcarra, Zhiqian Han, Peng Gao, Meng Wang
Three-carbon chlorinated aliphatic hydrocarbons (3C-CAHs) are a group of contaminants widely used in various industrial processes. Despite their frequent occurrence in diverse environmental matrices and established toxicity, these compounds receive much less attention compared to their shorter-chain counterparts such as trichloroethylene and dichloroethylene, leading to significant gaps in regulations and knowledge about their contamination levels and treatment approaches. This review aims to address these notable research gaps on 3C-CAHs, exploring their use, discharge, occurrence, fate, and transport across environmental matrices. By comparing them with one- and two-carbon CAHs, we highlight the unique properties and toxicity profiles of 3C-CAHs. Furthermore, we discuss state-of-the-art treatment techniques for 3C-CAHs, focusing on adsorption, chemical treatment, and biodegradation, and identify respective advantages and limitations. We also summarize regulations at state and federal levels in the U.S. and globally, underscoring the inadequacy of existing regulations for many 3C-CAH compounds. Lastly, we propose future research needs to further advance our understanding of the current contamination status of 3C-CAHs and to promote the development of sustainable and effective treatment methods for mitigating their environmental impacts. Overall, through this review, we aim to raise awareness and stimulate discussion on the importance of addressing 3C-CAHs in environmental management strategies.
{"title":"Underrecognized three-carbon chlorinated aliphatic hydrocarbons: Occurrence, regulation, and treatment strategies","authors":"Maria Jose Jimenez Vizcarra, Zhiqian Han, Peng Gao, Meng Wang","doi":"10.1080/10643389.2025.2484889","DOIUrl":"https://doi.org/10.1080/10643389.2025.2484889","url":null,"abstract":"Three-carbon chlorinated aliphatic hydrocarbons (3C-CAHs) are a group of contaminants widely used in various industrial processes. Despite their frequent occurrence in diverse environmental matrices and established toxicity, these compounds receive much less attention compared to their shorter-chain counterparts such as trichloroethylene and dichloroethylene, leading to significant gaps in regulations and knowledge about their contamination levels and treatment approaches. This review aims to address these notable research gaps on 3C-CAHs, exploring their use, discharge, occurrence, fate, and transport across environmental matrices. By comparing them with one- and two-carbon CAHs, we highlight the unique properties and toxicity profiles of 3C-CAHs. Furthermore, we discuss state-of-the-art treatment techniques for 3C-CAHs, focusing on adsorption, chemical treatment, and biodegradation, and identify respective advantages and limitations. We also summarize regulations at state and federal levels in the U.S. and globally, underscoring the inadequacy of existing regulations for many 3C-CAH compounds. Lastly, we propose future research needs to further advance our understanding of the current contamination status of 3C-CAHs and to promote the development of sustainable and effective treatment methods for mitigating their environmental impacts. Overall, through this review, we aim to raise awareness and stimulate discussion on the importance of addressing 3C-CAHs in environmental management strategies.","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"45 1","pages":"1047-1069"},"PeriodicalIF":12.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144237834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Peracetic acid (PAA) based advanced oxidation processes (AOPs) have received increasing attention in wastewater treatment. However, it is challenging to identify the radical and/or non-radical species and elucidate the intrinsic interaction mechanisms involved in PAA-based AOPs. This work presents a systematic review of the selective generation mechanisms of radicals (hydroxyl and organic radicals), with a focus on organic radicals, and non-radical species (reactive complexes (RC), high-valent metals (HVM), singlet oxygen (1O2), and electron transfer process (ETP)). Furthermore, we examine various strategies for the precise identification and characterization of radical and/or non-radical species (e.g., quenching, chemical probes, spectroscopy, mass spectrometry, and electrochemical testing), and emphasize existing controversies. Subsequently, we provide an in-depth discussion of the reaction mechanisms between the reactive species and the contaminants/water matrices, as well as the potential for generating halogenated byproducts. Finally, we highlight the challenges and opportunities of the PAA-based AOPs in wastewater treatment, aiming to inspire future research endeavors that promote the practical application of PAA-based AOPs in wastewater treatment.
{"title":"Peracetic acid-driven advanced oxidation processes for wastewater treatment: Demystifying organic radicals and non-radical species","authors":"Guanglei Yao, Xuefei Zhou, Haiping Gao, Tongcai Liu, Yalei Zhang, Jiabin Chen","doi":"10.1080/10643389.2025.2495637","DOIUrl":"https://doi.org/10.1080/10643389.2025.2495637","url":null,"abstract":"Peracetic acid (PAA) based advanced oxidation processes (AOPs) have received increasing attention in wastewater treatment. However, it is challenging to identify the radical and/or non-radical species and elucidate the intrinsic interaction mechanisms involved in PAA-based AOPs. This work presents a systematic review of the selective generation mechanisms of radicals (hydroxyl and organic radicals), with a focus on organic radicals, and non-radical species (reactive complexes (RC), high-valent metals (HVM), singlet oxygen (<sup>1</sup>O<sub>2</sub>), and electron transfer process (ETP)). Furthermore, we examine various strategies for the precise identification and characterization of radical and/or non-radical species (e.g., quenching, chemical probes, spectroscopy, mass spectrometry, and electrochemical testing), and emphasize existing controversies. Subsequently, we provide an in-depth discussion of the reaction mechanisms between the reactive species and the contaminants/water matrices, as well as the potential for generating halogenated byproducts. Finally, we highlight the challenges and opportunities of the PAA-based AOPs in wastewater treatment, aiming to inspire future research endeavors that promote the practical application of PAA-based AOPs in wastewater treatment.","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"4 1","pages":"1124-1147"},"PeriodicalIF":12.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-18DOI: 10.1080/10643389.2025.2484892
Zi-Tong Zhao, Jie Ding, Ji-Wei Pang, Mei-Yi Bao, Geng Luo, Bo-Yuan Wang, Bing-Feng Liu, Lu-Yan Zhang, Nan-Qi Ren, Shan-Shan Yang
Dark fermentation (DF) of lignocellulosic biomass (LB) is expected to play a critical role in building a green hydrogen supply chain toward the carbon-neutral society. Due to its inherent recalcitrance, biomass demands pretreatment to increase its digestibility. Various pretreatment techniques have been extensively investigated to improve the digestibility of feedstocks. However, no systematic review of pretreatment to promote biohydrogen fermentation has been conducted. Besides, studies analyzing the economic feasibility of pretreatment technologies are lacking. The aim of this review is to analyze the current pretreatment techniques and research results based on different driving forces. Intense thermochemical pretreatment dissolves lignin and hemicellulose and forms various inhibitors that interfere with the physiological and metabolic functions of the microbiota. Moreover, the issues related to the detoxification methods of inhibitors and their impacts on biomass fermentation were highlighted. The possibility of bioaugmentation of hydrogen-producing microflora with genetically engineered or naturally resistant bacteria may serve to be an effective in situ detoxification protocol. Moreover, the recycling techniques related to pretreatment were also discussed. Black liquor is a huge carbon reservoir with great potential to produce products such as biohydrogen and the value-added products generated will help reduce the environmental degradation caused by black liquor. Furthermore, the technical and economic viability of the current pretreatment methods and the prospects were also discussed. Increased costs related with buffering, reduced productivity and energy efficacy are critical factors contributing to the costs of bio-H2 production. For every 20% increase in H2 yield, production costs are decreased by 8%.
{"title":"Pretreatments of lignocellulosic biomass for biohydrogen biorefinery: Recent progress, techno-economic feasibility and prospectives","authors":"Zi-Tong Zhao, Jie Ding, Ji-Wei Pang, Mei-Yi Bao, Geng Luo, Bo-Yuan Wang, Bing-Feng Liu, Lu-Yan Zhang, Nan-Qi Ren, Shan-Shan Yang","doi":"10.1080/10643389.2025.2484892","DOIUrl":"https://doi.org/10.1080/10643389.2025.2484892","url":null,"abstract":"Dark fermentation (DF) of lignocellulosic biomass (LB) is expected to play a critical role in building a green hydrogen supply chain toward the carbon-neutral society. Due to its inherent recalcitrance, biomass demands pretreatment to increase its digestibility. Various pretreatment techniques have been extensively investigated to improve the digestibility of feedstocks. However, no systematic review of pretreatment to promote biohydrogen fermentation has been conducted. Besides, studies analyzing the economic feasibility of pretreatment technologies are lacking. The aim of this review is to analyze the current pretreatment techniques and research results based on different driving forces. Intense thermochemical pretreatment dissolves lignin and hemicellulose and forms various inhibitors that interfere with the physiological and metabolic functions of the microbiota. Moreover, the issues related to the detoxification methods of inhibitors and their impacts on biomass fermentation were highlighted. The possibility of bioaugmentation of hydrogen-producing microflora with genetically engineered or naturally resistant bacteria may serve to be an effective <i>in situ</i> detoxification protocol. Moreover, the recycling techniques related to pretreatment were also discussed. Black liquor is a huge carbon reservoir with great potential to produce products such as biohydrogen and the value-added products generated will help reduce the environmental degradation caused by black liquor. Furthermore, the technical and economic viability of the current pretreatment methods and the prospects were also discussed. Increased costs related with buffering, reduced productivity and energy efficacy are critical factors contributing to the costs of bio-H<sub>2</sub> production. For every 20% increase in H<sub>2</sub> yield, production costs are decreased by 8%.","PeriodicalId":10823,"journal":{"name":"Critical Reviews in Environmental Science and Technology","volume":"25 1","pages":"1070-1096"},"PeriodicalIF":12.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144237873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-18DOI: 10.1080/10643389.2025.2488808
Yexiang Chen, Haihua Xu, M. Shahnawaz Khan, Shiqi Han, Sidi Zhu
In recent decades, pharmaceuticals, lauded for saving millions of lives, have surfaced as a new class of environmental contaminants. These compounds, originating primarily from hospital and industrial settings, often resist traditional treatment technologies and can persist in the environment for extended periods. The scarcity of water resources underscores the urgent need for innovative strategies for the effective management of pharmaceutical wastewater. Recently, layered double hydroxides (LDHs) have garnered considerable attention for their application in the remediation of pharmaceutical wastewater. This review explores the recent advancements in LDH-based adsorbents and membranes for pharmaceutical wastewater treatment. LDHs demonstrate superior adsorption capabilities due to their intercalation properties and structural versatility, effectively removing pharmaceutical contaminants such as antibiotics and anti-inflammatory drugs. Moreover, LDH-modified membranes enhance separation efficiency by improving permeability, selectivity, and fouling resistance. Advanced analytical techniques, including machine learning and synchrotron radiation, have provided deeper insights into the LDH mechanisms. However, challenges such as metal leaching, low mechanical durability, and limited scalability remain critical hurdles. Future research should focus on optimizing LDH stability, integrating adsorption with membrane separation techniques, and exploring hybrid treatment strategies. The recovery of valuable pharmaceuticals through LDH-based systems also presents a sustainable approach to wastewater management. This review highlights the potential of LDHs in pharmaceutical wastewater treatment while identifying key points for further development to enhance their practicality and large-scale application.
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