Environmental Science and Ecotechnology最新文献

{"title":"Anthraquinones-based photocatalysis: A comprehensive review","authors":"Cheng-Xin Chen ,&nbsp;Shan-Shan Yang ,&nbsp;Ji-Wei Pang ,&nbsp;Lei He ,&nbsp;Ya-Ni Zang ,&nbsp;Lan Ding ,&nbsp;Nan-Qi Ren ,&nbsp;Jie Ding","doi":"10.1016/j.ese.2024.100449","DOIUrl":"https://doi.org/10.1016/j.ese.2024.100449","url":null,"abstract":"<div><p>In recent years, there has been significant interest in photocatalytic technologies utilizing semiconductors and photosensitizers responsive to solar light, owing to their potential for energy and environmental applications. Current efforts are focused on enhancing existing photocatalysts and developing new ones tailored for environmental uses. Anthraquinones (AQs) serve as redox-active electron transfer mediators and photochemically active organic photosensitizers, effectively addressing common issues such as low light utilization and carrier separation efficiency found in conventional semiconductors. AQs offer advantages such as abundant raw materials, controlled preparation, excellent electron transfer capabilities, and photosensitivity, with applications spanning the energy, medical, and environmental sectors. Despite their utility, comprehensive reviews on AQs-based photocatalytic systems in environmental contexts are lacking. In this review, we thoroughly describe the photochemical properties of AQs and their potential applications in photocatalysis, particularly in addressing key environmental challenges like clean energy production, antibacterial action, and pollutant degradation. However, AQs face limitations in practical photocatalytic applications due to their low electrical conductivity and solubility-related secondary contamination. To mitigate these issues, the design and synthesis of graphene-immobilized AQs are highlighted as a solution to enhance practical photocatalytic applications. Additionally, future research directions are proposed to deepen the understanding of AQs' theoretical mechanisms and to provide practical applications for wastewater treatment. This review aims to facilitate mechanistic studies and practical applications of AQs-based photocatalytic technologies and to improve understanding of these technologies.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"22 ","pages":"Article 100449"},"PeriodicalIF":14.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000632/pdfft?md5=0bcd7685d0c76c58f3d3bc8d6a8534aa&pid=1-s2.0-S2666498424000632-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the effectiveness of PM2.5 pollution control from the perspective of interprovincial transport and PM2.5 mitigation costs across China","authors":"Yihao Wang ,&nbsp;Xuying Wang ,&nbsp;Zeyuan Liu ,&nbsp;Shaoliang Chao ,&nbsp;Jing Zhang ,&nbsp;Yixuan Zheng ,&nbsp;Yu Zhang ,&nbsp;Wenbo Xue ,&nbsp;Jinnan Wang ,&nbsp;Yu Lei","doi":"10.1016/j.ese.2024.100448","DOIUrl":"https://doi.org/10.1016/j.ese.2024.100448","url":null,"abstract":"<div><p>Due to the transboundary nature of air pollutants, a province's efforts to improve air quality can reduce PM_2.5 concentration in the surrounding area. The inter-provincial PM_2.5 pollution transport could bring great challenges to related environmental management work, such as financial fund allocation and subsidy policy formulation. Herein, we examined the transport characteristics of PM_2.5 pollution across provinces in 2013 and 2020 via chemical transport modeling and then monetized inter-provincial contributions of PM_2.5 improvement based on pollutant emission control costs. We found that approximately 60% of the PM_2.5 pollution was from local sources, while the remaining 40% originated from outside provinces. Furthermore, about 1011 billion RMB of provincial air pollutant abatement costs contributed to the PM_2.5 concentration decline in other provinces during 2013–2020, accounting for 41.2% of the total abatement costs. Provinces with lower unit improvement costs for PM_2.5, such as Jiangsu, Hebei, and Shandong, were major contributors, while Guangdong, Guangxi, and Fujian, bearing higher unit costs, were among the main beneficiaries. Our study identifies provinces that contribute to air quality improvement in other provinces, have high economic efficiency, and provide a quantitative framework for determining inter-provincial compensations. This study also reveals the uneven distribution of pollution abatement costs (PM_2.5 improvement/abatement costs) due to transboundary PM_2.5 transport, calling for adopting inter-provincial economic compensation policies. Such mechanisms ensure equitable cost-sharing and effective regional air quality management.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"22 ","pages":"Article 100448"},"PeriodicalIF":14.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000620/pdfft?md5=40e5832304cf6e67fe9a5f92355dfcd5&pid=1-s2.0-S2666498424000620-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141607240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geobatteries in environmental biogeochemistry: Electron transfer and utilization","authors":"Shihao Cui ,&nbsp;Rui Wang ,&nbsp;Qing Chen ,&nbsp;Lorenzo Pugliese ,&nbsp;Shubiao Wu","doi":"10.1016/j.ese.2024.100446","DOIUrl":"https://doi.org/10.1016/j.ese.2024.100446","url":null,"abstract":"<div><p>The efficiency of direct electron flow from electron donors to electron acceptors in redox reactions is significantly influenced by the spatial separation of these components. Geobatteries, a class of redox-active substances naturally present in soil–water systems, act as electron reservoirs, reversibly donating, storing, and accepting electrons. This capability allows the temporal and spatial decoupling of redox half-reactions, providing a flexible electron transfer mechanism. In this review, we systematically examine the critical role of geobatteries in influencing electron transfer and utilization in environmental biogeochemical processes. Typical redox-active centers within geobatteries, such as quinone-like moieties, nitrogen- and sulfur-containing groups, and variable-valent metals, possess the potential to repeatedly charge and discharge. Various characterization techniques, ranging from qualitative methods like elemental analysis, imaging, and spectroscopy, to quantitative techniques such as chemical, spectroscopic, and electrochemical methods, have been developed to evaluate this reversible electron transfer capacity. Additionally, current research on the ecological and environmental significance of geobatteries extends beyond natural soil–water systems (e.g., soil carbon cycle) to engineered systems such as water treatment (e.g., nitrogen removal) and waste management (e.g., anaerobic digestion). Despite these advancements, challenges such as the complexity of environmental systems, difficulties in accurately quantifying electron exchange capacity, and scaling-up issues must be addressed to fully unlock their potential. This review underscores both the promise and challenges associated with geobatteries in responding to environmental issues, such as climate change and pollutant transformation.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"22 ","pages":"Article 100446"},"PeriodicalIF":14.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000607/pdfft?md5=405392aab693313bd59d790efc365d2f&pid=1-s2.0-S2666498424000607-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic governance: China's roadmap to improved health through climate and clean air actions","authors":"Tao Xue,&nbsp;Tong Zhu","doi":"10.1016/j.ese.2024.100447","DOIUrl":"https://doi.org/10.1016/j.ese.2024.100447","url":null,"abstract":"","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"20 ","pages":"Article 100447"},"PeriodicalIF":14.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000619/pdfft?md5=f0072d136b5de66717b25a3c5482bcbf&pid=1-s2.0-S2666498424000619-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Keratinous and corneous-based products towards circular bioeconomy: A research review","authors":"Giovanni Davide Barone ,&nbsp;Irene Tagliaro ,&nbsp;Rodrigo Oliver-Simancas ,&nbsp;Matteo Radice ,&nbsp;Livia M. Kalossaka ,&nbsp;Michele Mattei ,&nbsp;Antonino Biundo ,&nbsp;Isabella Pisano ,&nbsp;Amparo Jiménez-Quero","doi":"10.1016/j.ese.2024.100444","DOIUrl":"10.1016/j.ese.2024.100444","url":null,"abstract":"<div><p>Keratins and corneous proteins are key components of biomaterials used in a wide range of applications and are potential substitutes for petrochemical-based products. Horns, hooves, feathers, claws, and similar animal tissues are abundant sources of α-keratin and corneous β-proteins, which are by-products of the food industry. Their close association with the meat industry raises environmental and ethical concerns regarding their disposal. To promote an eco-friendly and circular use of these materials in novel applications, efforts have focused on recovering these residues to develop sustainable, non-animal-related, affordable, and scalable procedures. Here, we review and examine biotechnological methods for extracting and expressing α-keratins and corneous β-proteins in microorganisms. This review highlights consolidated research trends in biomaterials, medical devices, food supplements, and packaging, demonstrating the keratin industry's potential to create innovative value-added products. Additionally, it analyzes the state of the art of related intellectual property and market size to underscore the potential within a circular bioeconomic model.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"22 ","pages":"Article 100444"},"PeriodicalIF":14.0,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000589/pdfft?md5=5a24035c671ccb5c42b24395a82d377a&pid=1-s2.0-S2666498424000589-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141961330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nature-based bioreactors: Tackling antibiotic resistance in urban wastewater treatment","authors":"Lluís Bertrans-Tubau ,&nbsp;Sergio Martínez-Campos ,&nbsp;Julio Lopez-Doval ,&nbsp;Meritxell Abril ,&nbsp;Sergio Ponsá ,&nbsp;Victoria Salvadó ,&nbsp;Manuela Hidalgo ,&nbsp;Anna Pico-Tomàs ,&nbsp;Jose Luis Balcazar ,&nbsp;Lorenzo Proia","doi":"10.1016/j.ese.2024.100445","DOIUrl":"https://doi.org/10.1016/j.ese.2024.100445","url":null,"abstract":"<div><p>The overuse and misuse of antibiotics have accelerated the selection of antibiotic-resistant bacteria, significantly impacting human, animal, and environmental health. As aquatic environments are vulnerable to antibiotic resistance, suitable management practices should be adopted to tackle this phenomenon. Here we show an effective, nature-based solution for reducing antibiotic resistance from actual wastewater. We utilize a bioreactor that relies on benthic (biofilms) and planktonic microbial communities to treat secondary effluent from a small urban wastewater treatment plant (&lt;10,000 population equivalent). This treated effluent is eventually released into the local aquatic ecosystem. We observe high removal efficiency for genes that provide resistance to commonly used antibiotic families, as well as for mobile genetic elements that could potentially aid in their spread. Importantly, we notice a buildup of sulfonamide (<em>sul1</em> and <em>sul2</em>) and tetracycline (<em>tet(C)</em>, <em>tet(G)</em>, and <em>tetR</em>) resistance genes specifically in biofilms. This advancement marks the initial step in considering this bioreactor as a nature-based, cost-effective tertiary treatment option for small UWWTPs facing antibiotic resistance challenges.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"22 ","pages":"Article 100445"},"PeriodicalIF":14.0,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000590/pdfft?md5=1ef9cea825e211b8c0b97200670d6d4a&pid=1-s2.0-S2666498424000590-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141542010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strong metal-support interaction (SMSI) in environmental catalysis: Mechanisms, application, regulation strategies, and breakthroughs","authors":"Fuyuan Qi,&nbsp;Jianfei Peng,&nbsp;Zilu Liang,&nbsp;Jiliang Guo,&nbsp;Jiayuan Liu,&nbsp;Tiange Fang,&nbsp;Hongjun Mao","doi":"10.1016/j.ese.2024.100443","DOIUrl":"10.1016/j.ese.2024.100443","url":null,"abstract":"<div><p>The strong metal-support interaction (SMSI) in supported catalysts plays a dominant role in catalytic degradation, upgrading, and remanufacturing of environmental pollutants. Previous studies have shown that SMSI is crucial in supported catalysts' activity and stability. However, for redox reactions catalyzed in environmental catalysis, the enhancement mechanism of SMSI-induced oxygen vacancy and electron transfer needs to be clarified. Additionally, the precise control of SMSI interface sites remains to be fully understood. Here we provide a systematic review of SMSI's catalytic mechanisms and control strategies in purifying gaseous pollutants, treating organic wastewater, and valorizing biomass solid waste. We explore the adsorption and activation mechanisms of SMSI in redox reactions by examining interfacial electron transfer, interfacial oxygen vacancy, and interfacial acidic sites. Furthermore, we develop a precise regulation strategy of SMSI from systematical perspectives of interface effect, crystal facet effect, size effect, guest ion doping, and modification effect. Importantly, we point out the drawbacks and breakthrough directions for SMSI regulation in environmental catalysis, including partial encapsulation strategy, size optimization strategy, interface oxygen vacancy strategy, and multi-component strategy. This review article provides the potential applications of SMSI and offers guidance for its controlled regulation in environmental catalysis.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"22 ","pages":"Article 100443"},"PeriodicalIF":14.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000577/pdfft?md5=6ba288c77ca3ac4caff084f5d2614e8a&pid=1-s2.0-S2666498424000577-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141951399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"65% cover is the sustainable vegetation threshold on the Loess Plateau","authors":"Yi-ping Chen ,&nbsp;Kai-bo Wang ,&nbsp;Bo-jie Fu ,&nbsp;Yan-fen Wang ,&nbsp;Han-wen Tian ,&nbsp;Yi Wang ,&nbsp;Yi Zhang","doi":"10.1016/j.ese.2024.100442","DOIUrl":"https://doi.org/10.1016/j.ese.2024.100442","url":null,"abstract":"<div><p>Global temperatures will continue to increase in the future. The ∼640,000-km² Loess Plateau (LP) is a typical arid and semi-arid region in China. Similar regions cover ∼41% of the Earth, and its soils are some of the most severely eroded anywhere in the world. It is very important to understand the vegetation change and its ecological threshold under climate change on the LP for the sustainable development in the Yellow River Basin. However, little is known about how vegetation on the LP will respond to climate change and what is the sustainable threshold level of vegetation cover on the LP. Here we show that the temperature on the LP has risen 0.27 °C per decade over the past 50 years, a rate that is 30% higher than the average warming rate across China. During historical times, vegetation change was regulated by environmental factors and anthropogenic activities. Vegetation coverage was about 53% on the LP from the Xia Dynasty to the Spring and Autumn and Warring States period. Over the past 70 years, however, the environment has gradually improved and the vegetation cover had increased to ∼65% by 2021. We forecast future changes of vegetation cover on the LP in 2030s, in 2050s and in 2070s using SDM (Species Distribution Model) under Low-emission scenarios, Medium-emission scenarios and High-emission scenarios. An average value of vegetation cover under the three emission scenarios will be 64.67%, 62.70% and 61.47%, respectively. According to the historical record and SDM forecasts, the threshold level of vegetation cover on the LP is estimated to be 53–65%. Currently, vegetation cover on the LP has increased to the upper limit of the threshold value (∼65%). We conclude that the risk of ecosystem collapse on the LP will increase with further temperature increases once the vegetated area and density exceed the threshold value. It is urgent to adopt sustainable strategies such as stopping expanding vegetation area and scientifically optimizing the vegetation structure on the LP to improve the ecological sustainability of the Yellow River Basin.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"22 ","pages":"Article 100442"},"PeriodicalIF":14.0,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000565/pdfft?md5=1c264a25cf8cb314b35525a445a21dab&pid=1-s2.0-S2666498424000565-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Valorisation of industrial hemp (Cannabis sativa L.) residues and cheese whey into volatile fatty acids for single cell protein production","authors":"Carlo Moscariello,&nbsp;Silvio Matassa,&nbsp;Francesco Pirozzi,&nbsp;Giovanni Esposito,&nbsp;Stefano Papirio","doi":"10.1016/j.ese.2024.100439","DOIUrl":"10.1016/j.ese.2024.100439","url":null,"abstract":"<div><p>The production of single cell protein (SCP) using lignocellulosic materials stands out as a promising route in the circular bioeconomy transition. However, multiple steps are necessary for lignocellulosics-to-SCP processes, involving chemical pretreatments and specific aerobic cultures. Whereas there are no studies that investigated the SCP production from lignocellulosics by using only biological processes and microbial biomass able to work both anaerobically and aerobically. In this view, the valorisation of industrial hemp (<em>Cannabis sativa</em> L.) biomass residues (HBRs), specifically hurds and a mix of leaves and inflorescences, combined with cheese whey (CW) was investigated through a semi-continuous acidogenic co-fermentation process (co-AF). The aim of this study was to maximise HBRs conversion into VFAs to be further used as carbon-rich substrates for SCP production. Different process conditions were tested by either removing CW or increasing the amount of HBRs in terms of VS (i.e., two and four times) to evaluate the performance of the co-AF process. Increasing HBRs resulted in a proportional increase in VFA production up to 3115 mg HAc L⁻¹, with experimental production nearly 40% higher than theoretical predictions. The synergy between HBRs and CW was demonstrated, proving the latter as essential to improve the biodegradability of the former. The produced VFAs were subsequently tested as substrates for SCP synthesis in batch aerobic tests. A biomass concentration of 2.43 g TSS L⁻¹ was achieved with a C/N ratio of 5.0 and a pH of 9.0 after two days of aerobic fermentation, reaching a protein content of 42% (g protein per g TSS). These results demonstrate the overall feasibility of the VFA-mediated HBR-to-SCP valorisation process.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"21 ","pages":"Article 100439"},"PeriodicalIF":14.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266649842400053X/pdfft?md5=889e81d50253791b102694b88e119cc2&pid=1-s2.0-S266649842400053X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141413557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrite-driven anaerobic ethane oxidation","authors":"Cheng-Cheng Dang ,&nbsp;Yin-Zhu Jin ,&nbsp;Xin Tan ,&nbsp;Wen-Bo Nie ,&nbsp;Yang Lu ,&nbsp;Bing-Feng Liu ,&nbsp;De-Feng Xing ,&nbsp;Nan-Qi Ren ,&nbsp;Guo-Jun Xie","doi":"10.1016/j.ese.2024.100438","DOIUrl":"10.1016/j.ese.2024.100438","url":null,"abstract":"<div><p>Ethane, the second most abundant gaseous hydrocarbon in vast anoxic environments, is an overlooked greenhouse gas. Microbial anaerobic oxidation of ethane can be driven by available electron acceptors such as sulfate and nitrate. However, despite nitrite being a more thermodynamically feasible electron acceptor than sulfate or nitrate, little is known about nitrite-driven anaerobic ethane oxidation. In this study, a microbial culture capable of nitrite-driven anaerobic ethane oxidation was enriched through the long-term operation of a nitrite-and-ethane-fed bioreactor. During continuous operation, the nitrite removal rate and the theoretical ethane oxidation rate remained stable at approximately 25.0 mg NO₂^–N L⁻¹ d⁻¹ and 11.48 mg C₂H₆ L⁻¹ d⁻¹, respectively. Batch tests demonstrated that ethane is essential for nitrite removal in this microbial culture. Metabolic function analysis revealed that a species affiliated with a novel genus within the family Rhodocyclaceae, designated as '<em>Candidatus</em> Alkanivoras nitrosoreducens', may perform the nitrite-driven anaerobic ethane oxidation. In the proposed metabolic model, despite the absence of known genes for ethane conversion to ethyl-succinate and succinate-CoA ligase, '<em>Ca</em>. A. nitrosoreducens' encodes a prospective fumarate addition pathway for anaerobic ethane oxidation and a complete denitrification pathway for nitrite reduction to nitrogen. These findings advance our understanding of nitrite-driven anaerobic ethane oxidation, highlighting the previously overlooked impact of anaerobic ethane oxidation in natural ecosystems.</p></div>","PeriodicalId":34434,"journal":{"name":"Environmental Science and Ecotechnology","volume":"21 ","pages":"Article 100438"},"PeriodicalIF":14.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666498424000528/pdfft?md5=dfae899e89f6f60f9a583213ab0f39ec&pid=1-s2.0-S2666498424000528-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141396370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}