ACS ES&T engineering最新文献

{"title":"Deciphering the Impact of Halogen Ions on the Oxidative Dynamics and Halogenated Byproduct Transformation in the Ferrate(VI)-Periodate Combined System","authors":"Xin-Jia Chen,&nbsp;Chang-Wei Bai,&nbsp;Pi-Jun Duan,&nbsp;Zhi-Quan Zhang and Fei Chen*,&nbsp;","doi":"10.1021/acsestengg.4c0062910.1021/acsestengg.4c00629","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00629https://doi.org/10.1021/acsestengg.4c00629","url":null,"abstract":"<p >Ferrate (Fe(VI)) and periodate (PI) are powerful oxidizing agents that have emerged as significant contributors to advanced wastewater treatment methods. Their synergistic interaction has been recognized for its enhanced oxidative capabilities. However, the presence of organic and inorganic ions, particularly halide ions such as chloride (Cl^–), bromide (Br^–), and iodide (I^–), can significantly influence oxidation kinetics and the transformation of organic pollutants. This study systematically investigated the oxidation mechanisms of the Fe(VI)–PI system and its performance in the presence of these halide ions. Dynamic experiments showed that halide ions markedly affected the activity of the Fe(VI)–PI system. Specifically, in the presence of Cl^–, the degradation efficiency of sulfamethoxazole (SMX) increased by 4.8% at pH 7.0 and 22.2% at pH 8.0. Similarly, Br^– enhanced the degradation efficiency by 12.5% at pH 7.0 and 26.2% at pH 8.0. In contrast, I^– completely inhibited the degradation process, likely due to their interaction with the oxidant. Additional removal experiments, detection tests, and electron spin resonance (ESR) analyses revealed that introducing halide ions significantly altered the composition of reactive species. Cl^– and Br^– promoted the formation of ^•OH and facilitated the reduction of Fe(VI) to Fe(IV)/Fe(V) species. This effect was strongly dependent on pH, which in turn influenced the degradation pathway. Product analysis and toxicity assessments further indicated that halide ions might lead to the formation of halogenated byproducts in the Fe(VI)–PI system, with pH playing a crucial role in regulating this process. This study provides a deeper understanding of the influence of halide ions on oxidation reactions and highlights their role in controlling the degradation of micropollutants and the formation of disinfection byproducts in water treatment.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 3","pages":"666–677 666–677"},"PeriodicalIF":7.4,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608989","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}

{"title":"Experimental Observation and Simulation of UV-C-Based Personal-Scale Reactors for Airborne Pathogen Disinfection","authors":"Christopher A. Bowers*,&nbsp;Jason A. Randall,&nbsp;Christopher Jones,&nbsp;Eric Prast,&nbsp;Xing Li,&nbsp;Deborah A. Mosca,&nbsp;Richard Rasansky,&nbsp;Karl G. Linden,&nbsp;Ernest R. Blatchley III and Joel Ducoste,&nbsp;","doi":"10.1021/acsestengg.4c0080310.1021/acsestengg.4c00803","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00803https://doi.org/10.1021/acsestengg.4c00803","url":null,"abstract":"<p >Airborne infectious disease is often controlled using filtration-based personal protective equipment (PPE), such as masks. However, such disease prevention measures have seen mixed use by the public, can be uncomfortable to wear over long periods of time, and produce significant levels of solid waste. An alternative to traditional masking is to enclose a UV source within a personal-scale reactor that a user breathes through and disinfects the air directly. In this work, a set of prototype personal-scale reactors were developed that utilize UV-C LEDs. Experimental measurements of the UV-C fluence rate within the reactors were conducted using a microfluorescent silica detector. Biological experiments were also conducted, where an aerosolized challenge agent was passed through the reactor, and the fraction of agent inactivation by UV-C exposure was quantified as a function of airflow rate. Experimental results were compared to simulations, in which computational fluid dynamics and optical simulations were used to simulate the inactivation of an infective agent resulting from UV exposure. The disinfection simulation results were similar to the experimental data, showing how computational modeling can be used to inform UV-C-based PPE designs that could be later experimentally investigated. Both simulations and experiments indicated that it is possible to achieve in excess of 1.3 log10 disinfection using personal-scale reactors, making them more effective than an N95 mask, even when disinfecting airflow rates that correspond to human respiration rates during moderate exercise. This is especially true when lining the walls of the reactors with reflective material that allows photon recycling within the reactor. This work presents a proof-of-concept for future UV-based PPE design that can become a standard tool for disease control and prevention.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 4","pages":"1054–1067 1054–1067"},"PeriodicalIF":7.4,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814443","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}

{"title":"Improving CO2 Electromethanogenesis: The Role of Carbon Dots in Biofilm Development and Extracellular Electron Transfer","authors":"Jiayi Wang,&nbsp;Xueqin Lu,&nbsp;Shiliang Heng,&nbsp;Samir Ibrahim Gadow,&nbsp;Guihua Zhuo,&nbsp;Teng Cai,&nbsp;Yule Han,&nbsp;Wanjiang Li and Guangyin Zhen*,&nbsp;","doi":"10.1021/acsestengg.4c0073510.1021/acsestengg.4c00735","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00735https://doi.org/10.1021/acsestengg.4c00735","url":null,"abstract":"<p >Bioelectrochemical approaches for transforming CO₂ into low-carbon extracellular chemicals can be beneficial for storing energy, reducing greenhouse gas emissions, and promoting sustainable practices. Addressing challenges such as low biofilm adhesion and slow electron transfer dynamics within the biofilm–electrode interface is crucial for improving the bioelectroconversion of CO₂ into CH₄. Therefore, this study investigates the technical feasibility of supplying carbon dots (CDs), a porous and highly conductive nanomaterial, to enhance biofilm adhesion behaviors and electron transfer dynamics within biofilm–electrode interactions for maximizing the bioelectroconversion capability of CO₂ to CH₄. With the addition of carbon dots, the methane production rate increased by 35.3% (64.0 ± 12.9 mL·L_reactor^–1·d^–1) and charge transfer resistance decreased by 8.7%. Supplementing with carbon dots improved the metabolic processes of methanogenic microorganisms, resulting in increases of 18.7%, 23.5%, and 19.8% in aromatic proteins, fulvic acids, and DNA content in biofilm, respectively. The 25.6% increase in biomass led to the formation of a more stable and active biofilm structure, improving the adhesion and activity of methane-producing microbes. Remarkably, the abundance of archaea, particularly hydrogenotrophic methanogens, like <i>Methanobacterium</i>, soared to a significant proportion of 43.6%. Carbon dots increase the proportion of the <i>Mtr</i> gene family linked to nanowire synthesis, regulating environmental conditions and promoting the secretion of beneficial metabolites, thereby enhancing microbial biofilm formation and providing a solid foundation for process stability and longevity. The findings of this study endorse the development of sustainable CO₂ upgrading technologies and provide useful insights into microbial metabolism, electron transfer, and biofilm structure.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 4","pages":"953–969 953–969"},"PeriodicalIF":7.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814442","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}

{"title":"Green Recovery of Precious Metals from Discarded Waste through a Peroxymonosulfate-Based Homogeneous Fenton-Like System","authors":"Anting Ding,&nbsp;Chenchen Zhu,&nbsp;Chuanying Liu* and Chengliang Xiao*,&nbsp;","doi":"10.1021/acsestengg.4c0067010.1021/acsestengg.4c00670","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00670https://doi.org/10.1021/acsestengg.4c00670","url":null,"abstract":"<p >Precious metal (PM) recovery from discarded waste is essential to mitigate supply risks; however, traditional methods typically cause substantial environmental harm. This study presents a novel leaching process employing a low-concentration peroxymonosulfate (PMS)/CoCl₂ Fenton-like system for the efficient recovery of gold (Au), palladium (Pd), and platinum (Pt) from electronic waste and spent catalysts. Through electron paramagnetic resonance spectroscopy, ¹⁸O isotope tracing, and density functional theory calculations, SO₄·^–, ·OH, and reactive Co species were identified as the primary reactive species responsible for the oxidative dissolution of the PMs. Notably, the spontaneous cycling between Co(II) and Co(III) oxidation states sustained the solution’s reactivity for over 12 consecutive cycles. To demonstrate the efficacy of this method, hectogram quantities of spent Pd/C catalyst were processed, yielding 1.97 g of high-purity Pd. Operating at room temperature and without the need for strong acids or toxic cyanides, this method offers a sustainable alternative for PM recovery. Furthermore, this study highlights the broader potential of advanced oxidation processes for the efficient and environmentally friendly recycling of secondary resources.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 3","pages":"782–791 782–791"},"PeriodicalIF":7.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608987","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}

{"title":"Simultaneous Nitrification–Endogenous Denitrification with Phosphorus Removal Sustained by Aeration-Free Filamentous Microalgal–Bacterial Granular Sludge for Low C/N Wastewater Treatment","authors":"Liaofan Tang,&nbsp;Yuqing Zhang,&nbsp;Mingming Gao and Xinhua Wang*,&nbsp;","doi":"10.1021/acsestengg.4c0083310.1021/acsestengg.4c00833","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00833https://doi.org/10.1021/acsestengg.4c00833","url":null,"abstract":"<p >The innovative and carbon-neutral phototrophic simultaneous nitrification–endogenous denitrification with phosphorus removal (P-SNDPR) process presents significant advantages for low C/N wastewater treatment. Effective implementation of SNDPR relies on establishing anoxic zones during light-aerobic stages, which poses challenges in suspended sludge systems. Microalgal–bacterial granular sludge (MBGS) may address these challenges due to its biological and chemical stratified microniches, although the granulation, structure, and performance of MBGS under low C/N and aeration-free conditions remain unreported. This study successfully cultivated filamentous MBGS with a distinct oxygen gradient and microbial stratification within the granular landscape. Filamentous cyanobacteria (<i>f_</i><i>Leptolyngbyaceae</i>) and functional genera responsible for nutrient removal and granulation (<i>Acinetobacter</i>, <i>Candidatus</i> Competibacter, <i>Zoogloea</i>, <i>Flavobacterium</i>, and <i>Hydrogenophaga</i>) were enriched. The MBGS had high removal efficiencies for COD (92.9 ± 1.2%), NH₄–N (95.0 ± 0.7%), TN (83.8 ± 1.4%), and PO₄–P (96.8 ± 0.9%) with an aerobic SND efficiency of 77.8 ± 2.7%. Typical cycle and batch tests demonstrated that the MBGS achieved efficient SNDPR. Mass balance calculations indicated that most removed carbon (76.0%) and phosphorus (97.6%) were converted to biomass. The MBGS-SNDPR process established a synergistic pathway for carbon, nitrogen, and phosphorus metabolism, suggesting potential applications in sustainable wastewater treatment.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 5","pages":"1160–1170 1160–1170"},"PeriodicalIF":7.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921352","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}

{"title":"Cooking Oil Fumes: A Comprehensive Review of Emission Characteristics and Catalytic Oxidation Strategies","authors":"Ying Feng,&nbsp;Yunpeng Jiang,&nbsp;Mengwei Hua,&nbsp;Zhiquan Hou,&nbsp;Yuxi Liu,&nbsp;Jiguang Deng* and Hongxing Dai*,&nbsp;","doi":"10.1021/acsestengg.4c0067110.1021/acsestengg.4c00671","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00671https://doi.org/10.1021/acsestengg.4c00671","url":null,"abstract":"<p >Cooking oil fumes contain complex particulate matter and volatile organic compounds (VOCs), which pose a significant threat to the atmospheric environment and human health. This review offers a detailed analysis of the chemical compositions and emission characteristics of VOCs from cooking oil fumes and their corresponding treatment methods, with the highlight being put on the current state of catalytic VOC oxidation, which covers the oxidation of various VOCs, including alkanes, aromatics, oxygenated VOCs, and mixed VOCs. The review also explores the types and formation mechanisms of the byproducts of VOC oxidation. Moreover, it offers an in-depth examination of catalytic oxidation performance, mechanisms, and future development directions of various catalysts, including noble-metal-based, transition metal oxide, and rare-earth-doped catalysts. The conclusions drawn from this review can provide useful insights into efficient elimination of VOCs from cooking and related industries.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 2","pages":"303–324 303–324"},"PeriodicalIF":7.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402323","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}

{"title":"Skeletal Structure-Based Conditioning for Improved Deep-Dewatering Efficiency of High-Salinity Food Waste Digestate","authors":"Yun-Yan Gao,&nbsp;Yuan-Ping Zeng,&nbsp;Xuan-Xin Chen,&nbsp;Zhi-Yi He,&nbsp;Raymond Jianxiong Zeng* and Hou-Feng Wang*,&nbsp;","doi":"10.1021/acsestengg.4c0060210.1021/acsestengg.4c00602","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00602https://doi.org/10.1021/acsestengg.4c00602","url":null,"abstract":"<p >The solid–liquid separation of food waste anaerobic digestate residue (FD) is a crucial step in maximizing the efficiency and sustainability of anaerobic digestion processes. However, the high salinity and organic content of FD significantly hinder conventional dewatering methods, making deep-dewatering particularly challenging. This study introduces a composite conditioning strategy using basic aluminum chloride (BAC) and a complex quaternary ammonium salt surfactant (G agent) to enhance the digestate’s drainage performance and dewatering efficiency by constructing a skeletal structure within it. Experimental results showed that BAC+G composite conditioning significantly reduced the water content of the digestate from 90.69 ± 0.36 to 54.19 ± 0.16%, achieving deep dewatering that was unattainable with BAC or G agent alone. On a macroscopic scale, the BAC+G treatment enhanced floc strength and increased flocculated particle size to 469.07 ± 0.73 μm, approximately 18 times larger than untreated digestate, which significantly mitigated clogging and improved the permeability coefficient from 2.40 × 10^–6 to 9.79 × 10^–6 cm/s, ensuring smooth water discharge. Microscopically, the treatment increased effective porosity by 34.90%, reduced tortuosity to 1.45, and improved overall permeability (4.41), accelerating water discharge and further enhancing the dewatering performance. Additionally, BAC+G composite conditioning transformed floc particles to hydrophobic, lowered the interfacial free energy, and formed stable structures, further enhancing dewatering performance. These findings demonstrate that combining flocculation with skeletal structure formation is critical for achieving deep-dewatering of a high-salinity food waste digestate. This research provides a promising approach for improving digestate management and could have broader implications for the sustainable treatment of high-moisture organic waste streams.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 3","pages":"620–630 620–630"},"PeriodicalIF":7.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608985","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}

{"title":"Advances in Purification of Organic Exhaust via Microbial Electrochemical Systems: Mechanistic Understanding, Performance, and Future Prospects","authors":"Shen Zhang,&nbsp;Jianan Feng,&nbsp;Xinwu Liu,&nbsp;Changsen Zhang,&nbsp;Shunyi Li,&nbsp;Ruiqin Zhang and Panpan Liu*,&nbsp;","doi":"10.1021/acsestengg.4c0058610.1021/acsestengg.4c00586","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00586https://doi.org/10.1021/acsestengg.4c00586","url":null,"abstract":"<p >Industrial exhausts containing volatile organic compounds (VOCs) threaten the atmosphere and human health. Purification of organic exhausts by energy-efficient approaches would be necessary for sustainable industrial production. Recently, microbial electrochemical systems (MES) have emerged as an innovative biotechnological solution for removing VOCs in exhaust by combining microbial metabolism and electrochemical processes. MES and its integration with other technologies, i.e., photocatalysis, biotrickling filter, and electrocatalysis have achieved superior performance for VOCs removal. While nonnegligible gaps still exist in this field relating to industrial application. To get full insight into the development of MES for exhaust purification, this review summarizes working principles on VOCs degradation in various MES and the systematic evaluation of their performances. In addition, a critical review of strategies for improving the performance of MES is introduced. Challenges and future directions are identified for VOCs removal by MES in practical application. This review provides a comprehensive summary of the development of MES for VOCs and facilitates the development of more efficient and sustainable pollution control strategies.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 2","pages":"271–283 271–283"},"PeriodicalIF":7.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402256","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}

{"title":"Acid-Resistant Algae Accelerate Biomineralization Driven by Iron-Oxidizing Bacteria in Acid Mine Water through Serving as Electron Shuttles, Iron Ligands, and Seed Crystals","authors":"Long Su,&nbsp;Lanlan Liu,&nbsp;Jingsai Li,&nbsp;Xiang Chen,&nbsp;Di Fang* and Lixiang Zhou,&nbsp;","doi":"10.1021/acsestengg.4c0070610.1021/acsestengg.4c00706","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00706https://doi.org/10.1021/acsestengg.4c00706","url":null,"abstract":"<p >Iron biomineralization driven by chemoautotrophic iron-oxidizing bacteria (e.g., <i>Acidithiobacillus ferrooxidans</i>) facilitates acid mine water remediation but faces considerable technical challenges such as slow Fe(II) oxidation and Fe(III) precipitation. To address these challenges, we used the widely present acid-resistant algae (e.g., <i>Parachlorella kessleri</i>) as a green booster for Fe biomineralization. The assistance of <i>P</i>. <i>kessleri</i> in biomineralization with <i>A. ferrooxidans</i> improved the production of ferric hydroxysulfate minerals (66.2% schwertmannite and 33.8% goethite) in mine water (pH 2.7) with 1.6 and 1.4 times faster rates of Fe(II) oxidation and total soluble Fe precipitation. Mechanistically, algae-secreted extracellular organic matter (EOM), especially CHONS-containing high-molecular-weight (400–650 Da) compounds with low double-bond equivalent (DBE ≤ 10, O/C &lt; 0.2) and high carbon atom (C ≥ 15) (e.g., proteins), acted as electron shuttles with electron accepting and electron donating capacities of 0.9 and 0.7 mmol e^–/g C, respectively, that accelerate electron transfer between Fe(II) and <i>A. ferrooxidan</i> to generate more reactive oxygen species (H₂O₂ and ·OH) for Fe(II) oxidation. Algal EOM could also bond readily with Fe(II) at low pH to form EOM-bound Fe(II). Compared with free Fe(II), EOM-bound Fe(II) was more easily oxidized in the acidic mine water due to its relatively lower Gibbs free energy, higher current intensity, and smaller charge transfer resistance. In Fe(III) precipitation, single spherical algal cells could serve as seed crystals that initiate the heterogeneous nucleation of ferric hydroxysulfate minerals and accelerate their crystallization in mine water by reducing the supersaturation demand. These findings provide new insights into the highly efficient bioremediation of metal-rich acid mine waters with algal-bacterial synergy.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 3","pages":"805–815 805–815"},"PeriodicalIF":7.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608984","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}

{"title":"Microbial Iron Utilization Pathways in Constructed Wetlands: Analysis of Substrates Affecting Iron Transformation, Absorption, and Utilization","authors":"Xinyue Zhao,&nbsp;Yibo Shi,&nbsp;Lan Yang and Shih-Hsin Ho*,&nbsp;","doi":"10.1021/acsestengg.4c0044810.1021/acsestengg.4c00448","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00448https://doi.org/10.1021/acsestengg.4c00448","url":null,"abstract":"<p >Iron materials are known to enhance the nitrogen removal efficiency in constructed wetlands (CWs) by coupling iron transformation with nitrogen removal. However, current research lacks detailed explanations of the microbial processes involved in utilizing iron substrates, such as iron transformation, cellular iron uptake, and metabolism, leaving a gap in the understanding of these connections. This study addresses this gap by constructing four microcosm CW systems using Fe–C, various ratios of pyrite, and zerovalent iron (ZVI) as substrates. Experimental results indicated that the iron transformation was the most thermodynamically favorable with pyrite. Microbial communities on pyrite: gravel in a 2:1 volume ratio (2P1G) exhibited a greater propensity for Feammox, with a 0.76% increase in the functional microbial network of Feammox and a 31.20% increase in the abundance of the <i>nirA</i> gene associated with Feammox process compared to the Fe–C group. Conversely, the iron transformation in the Fe–C group was thermodynamically less favorable. To maintain intracellular iron homeostasis, microorganisms in the Fe–C group increased the siderophore activity. The gene abundances related to the release and absorption of siderophore were 22.12% and 17.26% increased, respectively, compared to 2P1G. This research employs the siderophore indicators to elucidate the link between iron transport and nitrogen metabolism, providing insights for improving nitrogen removal in CWs.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 2","pages":"366–376 366–376"},"PeriodicalIF":7.4,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402049","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}