Environmental Science: Water Research & Technology最新文献

{"title":"Applicability of β-lactamase entrapped agarose discs for removal of doripenem antibiotic: reusability and scale-up studies†","authors":"Huma Fatima, Amrik Bhattacharya and Sunil Kumar Khare","doi":"10.1039/D4EW00572D","DOIUrl":"https://doi.org/10.1039/D4EW00572D","url":null,"abstract":"<p >To alleviate escalating antibiotic pollution in the environment, there is a pressing need for sustainable antibiotic remediation techniques. Considering this, the present study focuses on entrapping β-lactamase from <em>Bacillus tropicus</em> EMB20 within an agarose matrix, subsequently employing it for the bioremediation of doripenem (a carbapenem antibiotic) and other β-lactam antibiotics. The agarose discs containing entrapped lactamase efficiently hydrolysed 50 mg L<small>⁻¹</small> of doripenem within 30 min of batch mode treatment. The toxicity of the antibiotic hydrolysed products was assessed using MTT assay and confocal microscopy, revealing their non-toxic nature to the antibiotic-sensitive cells of <em>E. coli</em> BL21 (DE3). These discs were successfully recovered and reused for up to 5 cycles with an efficiency rate of 72%. Furthermore, the discs demonstrated effectiveness in hydrolysing a mixture of antibiotics, including doripenem, meropenem, and amoxicillin, removing 100%, 96.4%, and 71.5% of each antibiotic after 30 min of treatment. This enzymatic treatment process was upscaled using a continuous mode fixed-bed column bioreactor (FBCR) packed with layers of lactamase-entrapped agarose discs and sand gravels. Remarkably, a mixture of doripenem, amoxicillin, and meropenem (each at 50 mg L<small>⁻¹</small>) was completely removed after a retention time of 20 min in the FBCR. This setup proved to be reusable for up to 5 cycles. Overall, the study emphasises the potential of utilising these β-lactamase-entrapped agarose discs as an effective remediation tool to control antibiotic pollution from the environment.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 12","pages":" 3146-3157"},"PeriodicalIF":3.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Improved microbial water quality and ozone performance following coagulation: implications for carbon based advanced treatment for potable reuse†","authors":"Christina M. Morrison, Ariel J. Atkinson, Daniel Gerrity and Eric C. Wert","doi":"10.1039/D4EW00638K","DOIUrl":"https://doi.org/10.1039/D4EW00638K","url":null,"abstract":"<p >To facilitate broader implementation of potable reuse, it is important to fully account for pathogen log<small>₁₀</small> reduction values (LRVs), including unit processes that are historically uncredited or under-credited. Despite its potential for pathogen removal, coagulation coupled with flocculation (C/F) has historically been omitted or overlooked when pursuing credits for potable reuse. However, with greater implementation of carbon-based advanced treatment (CBAT), which utilizes a combination of ozone, biofiltration, and granular activated carbon treatment as an alternative to membrane treatment (<em>i.e.</em>, reverse osmosis), C/F may emerge as a valuable unit process for achieving improvements in water quality, operational performance, and public health protection in potable reuse systems. This study evaluated the ability of C/F with ferric chloride to improve both bulk and microbial water quality of secondary wastewater effluent and improve downstream ozone performance. This study also evaluated potential surrogates for microbial removal during C/F treatment. C/F removed 17–54% of DOC with ferric doses ranging from 10–50 mg Fe per L, with 30 mg Fe per L sufficient for meeting TOC removal requirements from the Stage 1 D/DBPR for all evaluated secondary effluents. Coagulant doses of 30 mg Fe per L obtained LRVs ranging from 2–3 for MS2 and <em>B. subtilis</em> spores. MS2 and <em>B. subtilis</em> spore removal exhibited strong (<em>r</em> ≥ 0.8) and significant (<em>p</em> &lt; 0.05) Pearson's correlation with the removal of intact cell counts and total cell counts <em>via</em> flow cytometry (FCM), DOC, total adenosine triphosphate (ATP), and intracellular ATP. C/F immediately preceding ozone treatment improved inactivation of <em>B. subtilis</em> spores, lowered applied ozone doses, and increased ozone exposure (Ct) for similar specific ozone doses as compared to secondary effluent without C/F pre-treatment. Overall, C/F with ferric chloride was determined to be a valuable treatment step for removal of dissolved organic matter, MS2 bacteriophage, <em>B. subtilis</em> spores, and improvement of downstream ozone treatment. Furthermore, FCM, ATP, and DOC were determined to be strong potential candidates as surrogates for microorganism removal during C/F treatment, although further testing with pathogens is still necessary to justify LRV crediting.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 12","pages":" 3158-3171"},"PeriodicalIF":3.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ew/d4ew00638k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"A logic-based resilience metric for water resource recovery facilities","authors":"Anna S. Laino, Ben Wooding, Sadegh Soudjani and Russell J. Davenport","doi":"10.1039/D4EW00649F","DOIUrl":"10.1039/D4EW00649F","url":null,"abstract":"<p >This study develops quantifiable metrics to describe the resilience of Water Resource Recovery Facilities (WRRFs) under extreme stress events, including those posed by long-term challenges such as climate change and population growth. Resilience is the ability of the WRRFs to withstand adverse events while maintaining compliance or an operational level of service. Existing studies lack standardised resilience measurement methods. In this paper, we propose a resilience metric based on signal temporal logic (STL) to describe acceptable functionality of the WRRFs (<em>e.g.</em> meeting regulatory limits). By using Monte Carlo simulations and scenario optimisation on a model of a WRRF, we determine the maximum stress the WRRF can handle while meeting STL constraints for biochemical oxygen demand (BOD) and chemical oxygen demand (COD) compliance limits. The results are applied to a simple digital model of a facility with 22 components. Importantly, this method can be applied to data that water companies routinely and regularly monitor, and could be incorporated into SCADA systems. In our case studies, we determine threshold stressor values of extreme rainfall that result in a loss of resilience. Our results offer insights into the design of more resilient treatment processes to reduce environmental impacts.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 2","pages":" 377-392"},"PeriodicalIF":3.5,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11579996/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142708488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Sorption and biodegradation of stormwater trace organic contaminants via composite alginate bead geomedia with encapsulated microorganisms†","authors":"Debojit S. Tanmoy and Gregory H. LeFevre","doi":"10.1039/D4EW00600C","DOIUrl":"https://doi.org/10.1039/D4EW00600C","url":null,"abstract":"<p >Urban areas generate high volumes of stormwater runoff that frequently contains complex mixtures of hydrophilic trace organic contaminants (TOrCs) and dissolved nutrients. Green stormwater infrastructure is becoming increasingly adopted as a nature-based solution for improving water quality but is typically inefficient for removing dissolved-phase contaminants. We recently developed and characterized novel bioactive composite alginate bead media (BioSorp Beads) containing encapsulated PAC and iron-based water treatment residuals [FeWTR] as sorbents and white rot fungi as model biodegrading organisms to effectively capture and biodegrade stormwater-relevant TOrCs. We created multiple abiotic (no fungi) and biotic beads (containing <em>Trametes versicolor</em> or <em>Pleurotus ostreatus</em> fungi) to investigate sorption removal of a suite of representative dissolved-phase stormwater relevant pollutants (a neonicotinoid/metabolite, phosphate, three PFAS, and one tire-wear compound [acetanilide]). We also measured coupled sorption and biodegradation of acetanilide as a proof-of-concept demonstration of encapsulated biodegrading organisms. Alginate encapsulation increased desnitro-imidacloprid sorption onto PAC, likely due to the interactions between compound altered insecticidal functional groups and alginate. The sorption capacity of imidacloprid and desnitro-imidacloprid was up to 29.1 mg g<small>⁻¹</small> and 16.8 mg g<small>⁻¹</small>, respectively, and impacted by PAC presence and the partial charge distributions of the compounds. The encapsulated FeWTR and Fe<small>³⁺</small>-alginate beads drove phosphate sorption (42.1 mg phosphate per g beads). Long-chain PFAS removal in the beads (13.1 mg PFOA per g) was greater than short-chain PFAS removal capacity (5.2 mg PFBA per g, 5.1 mg PFBS per g). Encapsulated fungi were not inhibited by exposure to azide that typically kill fungi in laboratory experiments, indicating the potential for encapsulation to protect organisms from harsh conditions. Furthermore, biodegradation of acetanilide by encapsulated fungi beyond sorption controls demonstrated that coupled sorption and biodegradation with the beads occurred. BioSorp Beads successfully capture and biodegrade representative hydrophilic stormwater TOrCs and thus hold potential as a green stormwater infrastructure geomedium and bioaugmentation tool.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 12","pages":" 3339-3357"},"PeriodicalIF":3.5,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ew/d4ew00600c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Spectral characteristics of dissolved organic matter (DOM) in the middle reaches of the Huai River in a dry season†","authors":"Han Song, Liangmin Gao, Jing Xu, Limei Zhu, Xin Shu, Jieyu Xia, Kai Zhang and Lin Wu","doi":"10.1039/D4EW00499J","DOIUrl":"https://doi.org/10.1039/D4EW00499J","url":null,"abstract":"<p >The present study aims to investigate the characteristics of dissolved organic matter (DOM) in the Huai River in the winter dry season using UV-visible absorption spectroscopy (UV-vis), three-dimensional fluorescence excitation–emission matrix spectroscopy-parallel factor analysis (EEM-PARAFAC), and liquid chromatography-organic carbon detection (LC-OCD). The PARAFAC model results revealed three DOM chemical components, namely: UV-type humic substances (C1), humic acid-like substances (C2), and protein-like substances (C3). However, humic substance components (C1 + C2) were the major fluorescent DOM components, accounting for 61.88 ± 6.45%. In this study, the reduced external inputs in the winter dry season resulted in a significantly higher fluorescence intensity of the C3 component than that of C2 (<em>P</em> &lt; 0.01). On the other hand, the LC-OCD results indicated significant differences (<em>P</em> &lt; 0.01) between different water body types of the Huai River due to the strong influences of human activities and sewage discharge. The polysaccharide, humic substance, low molecular acid, and nitrogenous compound concentrations in the river water exhibited decreasing trends from upstream to downstream of the river. In contrast, the concentrations of amino acid derivatives exhibited a significant increasing trend from upstream to downstream of the river. The concentrations of nitrogenous compounds were accumulated in the confluence zone of the river tributaries and mainstream. The DOM concentrations in the river water were influenced by multiple factors. However, the decrease in the concentrations of proteins and polysaccharides enhanced the autochthonous process in the river water body, gradually increasing the concentrations of humic substances.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 12","pages":" 3308-3318"},"PeriodicalIF":3.5,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Heavy metal leaching from stormwater control measures – insights into field and lab prestressed media and road-deposited sediments†","authors":"Philipp Stinshoff, Yannic Henn, Steffen H. Rommel and Brigitte Helmreich","doi":"10.1039/D4EW00388H","DOIUrl":"https://doi.org/10.1039/D4EW00388H","url":null,"abstract":"<p >The risk of heavy metal leaching from sorptive filter media in stormwater control measures (SCMs) treating road runoff is mainly assessed through lab-scale studies. In contrast, investigations with filter media prestressed under real conditions are crucial. Therefore, the leaching potential of five traffic-relevant heavy metals (Cr, Cu, Ni, Pb, and Zn) from field-scale and lab-scale prestressed sorptive filter media and road-deposited sediments (RDSs) from a decentralized treatment facility was assessed using quiescent batch leaching tests with and without adding de-icing salts. The hydraulic retention times of a maximum of 7 days should represent prolonged submerged conditions during dry periods. The leaching quantity order was Zn ≫ Cu &gt; Ni, whereas no observed leaching was quantified for Cr and Pb for all tested materials. Considerable loads of Cu only leached from the field-scale prestressed sorptive filter media, which was mainly associated with the presence of dissolved organic matter. Regarding the tested filter media, zeolite and carbonate sand revealed significantly higher leaching of Zn under the influence of de-icing salts. The leaching of Cu and Zn concerning the mobile heavy metal fraction was less than 0.2%. The highest concentrations of heavy metals were observed for the RDSs, where up to 0.3% leached of the potential mobile fraction during one dry cycle.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 2","pages":" 328-340"},"PeriodicalIF":3.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ew/d4ew00388h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Sludge-derived novel Fe3O4–MgO@C composites for tetracycline abatement from wastewater using sustainable bio-electro-Fenton and nutrient recovery with co-precipitation: a waste-to-resource strategy†","authors":"Azhan Ahmad, Monali Priyadarshini, Shraddha Yadav, Makarand M. Ghangrekar and Rao Y. Surampalli","doi":"10.1039/D4EW00684D","DOIUrl":"https://doi.org/10.1039/D4EW00684D","url":null,"abstract":"<p >Developing efficient Fenton catalysts for the remediation of emerging pollutants is one of the challenges for researchers. Herein, a novel cathode catalyst <em>via</em> the utilization of waste electro-coagulated (ECO) sludge was synthesized for the efficient abatement of tetracycline (TC) through the bio-electro-Fenton (BEF) process. The carbon-felt-coated heterogeneous catalyst (Fe<small>₃</small>O<small>₄</small>–MgO@C) resulted in more than 96.7 ± 2.2% removal of 10 mg L<small>⁻¹</small> of TC during 420 min of operating time following pseudo-first-order kinetics at neutral pH. Moreover, 53.5 ± 2.5% mineralization in terms of total organic carbon removal was obtained for real municipal wastewater during the BEF treatment. Radical experimentation displayed ˙OH as the dominant oxidative species for TC degradation. Besides, the maximum power density achieved by Fe<small>₃</small>O<small>₄</small>–MgO@C-BEF was 114.5 ± 4.5 mW m<small>⁻²</small>, which was 2.6-times more than BEF operated without any catalyst (44.2 ± 2.7 mW m<small>⁻²</small>). The co-precipitation in the cathodic chamber of BEF <em>via</em> external addition of Fe<small>₃</small>O<small>₄</small>–MgO@C (63.6 mg L<small>⁻¹</small>) resulted in 1.20 ± 0.08 g L<small>⁻¹</small> of struvite recovery from synthetic urine. Overall, the sludge-derived catalyst might be beneficial for reducing the economics of future full-scale implementation of the technology, contributing to a circular economy, and fixing the lacunas of ECO technology for sludge management, thereby proposing an effective waste management strategy.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 12","pages":" 3172-3188"},"PeriodicalIF":3.5,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Equity-centered adaptive sampling in sub-sewershed wastewater surveillance using census data†","authors":"Amita Muralidharan, Rachel Olson, C. Winston Bess and Heather N. Bischel","doi":"10.1039/D4EW00552J","DOIUrl":"10.1039/D4EW00552J","url":null,"abstract":"<p >Sub-city, or sub-sewershed, wastewater monitoring for infectious diseases offers a data-driven strategy to inform local public health response and complements city-wide data from centralized wastewater treatment plants. Developing strategies for equitable representation of diverse populations in sub-city wastewater sampling frameworks is complicated by misalignment between demographic data and sampling zones. We address this challenge by: (1) developing a geospatial analysis tool that probabilistically assigns demographic data for subgroups aggregated by race and age from census blocks to sub-city sampling zones; (2) evaluating representativeness of subgroup populations for COVID-19 wastewater-based disease surveillance in Davis, California; and (3) demonstrating scenario planning that prioritizes vulnerable populations. We monitored SARS-CoV-2 in wastewater as a proxy for COVID-19 incidence in Davis (November 2021–September 2022). Daily city-wide sampling and thrice-weekly sub-city sampling from 16 maintenance holes covered nearly the entire city population. Sub-city wastewater data, aggregated as a population-weighted mean, correlated strongly with centralized treatment plant data (Spearman's correlation 0.909). Probabilistic assignment of demographic data can inform decisions when adapting sampling locations to prioritize vulnerable groups. We considered four scenarios that reduced the number of sampling zones from baseline by 25% and 50%, chosen randomly or to prioritize coverage of &gt;65-year-old populations. Prioritizing representation increased coverage of &gt;65-year-olds from 51.1% to 67.2% when removing half the zones, while increasing coverage of Black or African American populations from 67.5% to 76.7%. Downscaling had little effect on correlations between sub-city and centralized data (Spearman's correlations ranged from 0.875 to 0.917), with strongest correlations observed when prioritizing coverage of &gt;65-year-old populations.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 1","pages":" 136-151"},"PeriodicalIF":3.5,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11500673/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142491242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Removal of Cu2+ from AMD by goethite modified biochar combined with sodium alginate: characterization, performance and mechanisms†","authors":"Hong Yang, Ruixue Zhang, Li An, Pan Wu, Yuran Fu, Jiajun Zou and Min Yu","doi":"10.1039/D4EW00664J","DOIUrl":"https://doi.org/10.1039/D4EW00664J","url":null,"abstract":"<p >Efficient and environmentally friendly removal of Cu<small>²⁺</small> from wastewater has been the focus of recent research. However, the acid mine drainage (AMD) produced during the mining process, characterized by low pH and high concentrations of toxic heavy metals, poses a significant challenge for Cu<small>²⁺</small> removal. Therefore, in this study, corn stalks were selected as raw materials, and a goethite-modified biochar material (GMB) was prepared using the hydrolysis co-precipitation method at different temperatures and raw material ratios. Additionally, sodium alginate was used as a chelating agent to construct a composite material (SGB). The adsorption process, removal efficiency, and adsorption mechanism of Cu<small>²⁺</small> in acidic mine wastewater by GMB and SGB were investigated through batch adsorption experiments and characterization. Results showed that GMB adsorption followed the second-order kinetic and Langmuir models, with a maximum capacity of 51.23 mg g<small>⁻¹</small> at 25 °C, indicating single-layer homogeneous chemisorption. The Thomas model accurately described SGB's dynamic adsorption, with a high correlation (<em>R</em><small>²</small> = 0.94) and a maximum capacity of 117.68 mg g<small>⁻¹</small>. Both materials performed well under acidic conditions (pH 2.0–5.5) and in the presence of competing ions (Na<small>⁺</small>, Ca<small>²⁺</small>, Cl<small>⁻</small>, NO<small>₃</small><small>⁻</small>, SO<small>₄</small><small>²⁻</small>). The characterization results indicated that the adsorption mechanism of GMB for Cu<small>²⁺</small> primarily involved physical adsorption, electrostatic interactions, surface complexation, and co-precipitation. Additionally, after five adsorption–desorption cycles, GMB maintained a capacity of 29.55 mg g<small>⁻¹</small>, while SGB improved Cu<small>²⁺</small> removal from 72.71% to 94.27% compared to GMB alone. In conclusion, GMB and SGB demonstrated significant potential for Cu<small>²⁺</small> remediation in acid mine drainage.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 12","pages":" 3290-3307"},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Simultaneous removal of acetaminophen, sulfamethoxazole, and iohexol from real wastewater in continuous mode by an immobilized sulfur-doped Bi2O3/MnO2 photocatalyst†","authors":"Vishal Kumar Parida, Mario Vino Lincy Gnanaguru, Suneel Kumar Srivastava, Shamik Chowdhury and Ashok Kumar Gupta","doi":"10.1039/D4EW00501E","DOIUrl":"https://doi.org/10.1039/D4EW00501E","url":null,"abstract":"<p >Advanced oxidation processes like heterogeneous photocatalysis can degrade recalcitrant compounds. However, the overall potency of most semiconductor-based photocatalysts in continuous operation and real wastewater matrices remains inadequate. This study investigates the simultaneous removal of three contaminants, namely, acetaminophen (ACT), sulfamethoxazole (SMX), and iohexol (IOX), from actual municipal wastewater (MWW) and hospital wastewater (HWW) by utilizing a moving bed biofilm system coupled with a filtration unit, followed by a continuous photocatalytic reactor. Here, a sulfur-doped Bi<small>₂</small>O<small>₃</small>/MnO<small>₂</small> Z-scheme heterojunction photocatalyst immobilized over low-cost and eco-friendly clay beads (2S-BOMO CCB) was employed to degrade an ACT–SMX–IOX mixture in a continuous photocatalytic reactor. Under optimal conditions, removal efficiencies of 87.1 ± 1.4%, 82.6 ± 1.9%, and 77.5 ± 2.3% were attained for ACT, SMX, and IOX, respectively. The feasibility of reusing the spent photocatalyst was also investigated over ten consecutive cycles. Further, this study confirmed that the superoxide anion, hydroxyl radical, and singlet oxygen were dominant oxidative species for ACT–SMX–IOX degradation. However, the removal efficiency of ACT–SMX–IOX by 2S-BOMO CCB was significantly reduced due to the presence of various interfering agents in real wastewater. Nonetheless, when the hybrid system was employed, approximately 93.8 ± 2.7% and 89.4 ± 3.6% of ACT, 89.6 ± 1.8% and 83.7 ± 1.1% of SMX, and 84.5 ± 1.7% and 81.5 ± 3.3% of IOX were eliminated from MWW and HWW, respectively. These results endorse the applicability of the developed integrated technology for removing pharmaceutical contaminants from real wastewater.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":" 12","pages":" 3319-3338"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}