The photocatalytic removal of organic pollutants from wastewater is recognized as an economically viable and environmentally friendly technique. In this study, we successfully synthesized an Ag-WO3/BiVO4 (ABvW) nanocomposite photocatalyst that demonstrates exceptional efficiency in the photocatalytic degradation of eosin yellow (EY) dye. The synthesized photocatalysts were comprehensively characterized using various techniques, including BT-XRD, FE-SEM, XPS, BET and UV-DRS, to confirm their structural and optical properties.
The photocatalytic degradation of EY was conducted under LED light illumination, and our findings reveal that the ABvW nanocomposite exhibits superior photocatalytic performance, achieving nearly 94 % dye removal within 70 min with a high Quantum yield (QY) value. This performance is significantly higher than that of pure WO3, BiVO4, or Ag/WO3 samples individually. The enhanced photocatalytic activity of the ABvW nanocomposite is likely due to the effective suppression of charge recombination, increased specific surface area, and improved redox potential of the composite material, all of which contribute to the superior photocatalytic performance of the ABvW nanocomposite.
{"title":"Improved photocatalytic behavior of Ag-WO3/BiVO4 nanocomposite towards the removal of eosin yellow (EY) under visible light","authors":"Suresh Kumar Pandey , Prerna Sarwan , Dhanesh Tiwary , Mohammad Salman","doi":"10.1016/j.jwpe.2025.107216","DOIUrl":"10.1016/j.jwpe.2025.107216","url":null,"abstract":"<div><div>The photocatalytic removal of organic pollutants from wastewater is recognized as an economically viable and environmentally friendly technique. In this study, we successfully synthesized an Ag-WO<sub>3</sub>/BiVO<sub>4</sub> (ABvW) nanocomposite photocatalyst that demonstrates exceptional efficiency in the photocatalytic degradation of eosin yellow (EY) dye. The synthesized photocatalysts were comprehensively characterized using various techniques, including BT-XRD, FE-SEM, XPS, BET and UV-DRS, to confirm their structural and optical properties.</div><div>The photocatalytic degradation of EY was conducted under LED light illumination, and our findings reveal that the ABvW nanocomposite exhibits superior photocatalytic performance, achieving nearly 94 % dye removal within 70 min with a high Quantum yield (QY) value. This performance is significantly higher than that of pure WO<sub>3</sub>, BiVO<sub>4</sub>, or Ag/WO<sub>3</sub> samples individually. The enhanced photocatalytic activity of the ABvW nanocomposite is likely due to the effective suppression of charge recombination, increased specific surface area, and improved redox potential of the composite material, all of which contribute to the superior photocatalytic performance of the ABvW nanocomposite.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107216"},"PeriodicalIF":6.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-13DOI: 10.1016/j.jwpe.2025.107252
Yuhang Song , Lingmin Zhao , Lixing Huang , Yingxue Qin , Jiaonan Zhang , Jiaoling Zhang , Qingpi Yan
A novel heterotrophic nitrification-aerobic denitrification strain SW22, identified as Stutzerimonas stutzeri, was isolated from an aquaculture wastewater treatment system. The strain possessed key denitrification genes (amoA, napA, nirS, norB, nosZ) and demonstrated optimal performance at pH 7.5, 30 °C, and C/N ratio 14–18. In real aquaculture effluent, SW22 achieved removal efficiencies of 76.83 %, 75.32 %, and 65.71 % for NH4+-N, NO2−-N and NO3−-N, respectively. A bioaugmented sequencing batch reactor (q-SBR) was developed with optimized parameters through response surface methodology. The q-SBR system significantly enhanced nitrogen removal (90.51 % TN removal) compared to conventional SBR (77.36 %). Microbial community analysis revealed that bioaugmentation promoted the enrichment of denitrifying bacteria, suggesting its potential for aquaculture wastewater treatment.
{"title":"Enhanced nitrogen removal through bioaugmentation with Stutzerimonas stutzeri SW22: From denitrification mechanism to optimized sequencing batch reactor","authors":"Yuhang Song , Lingmin Zhao , Lixing Huang , Yingxue Qin , Jiaonan Zhang , Jiaoling Zhang , Qingpi Yan","doi":"10.1016/j.jwpe.2025.107252","DOIUrl":"10.1016/j.jwpe.2025.107252","url":null,"abstract":"<div><div>A novel heterotrophic nitrification-aerobic denitrification strain SW22, identified as <em>Stutzerimonas stutzeri</em>, was isolated from an aquaculture wastewater treatment system. The strain possessed key denitrification genes (<em>amoA, napA, nirS, norB, nosZ</em>) and demonstrated optimal performance at pH 7.5, 30 °C, and C/N ratio 14–18. In real aquaculture effluent, SW22 achieved removal efficiencies of 76.83 %, 75.32 %, and 65.71 % for NH<sub>4</sub><sup>+</sup>-N, NO<sub>2</sub><sup>−</sup>-N and NO<sub>3</sub><sup>−</sup>-N, respectively. A bioaugmented sequencing batch reactor (q-SBR) was developed with optimized parameters through response surface methodology. The q-SBR system significantly enhanced nitrogen removal (90.51 % TN removal) compared to conventional SBR (77.36 %). Microbial community analysis revealed that bioaugmentation promoted the enrichment of denitrifying bacteria, suggesting its potential for aquaculture wastewater treatment.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107252"},"PeriodicalIF":6.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.jwpe.2025.107123
Zhifu Tian , Huilin Wan , Ruotong Jin , Xiaojie Qiu , Bibek Bamanu , Yingxin Zhao
The exploitation of efficient sludge-derived biochar (SBC) is of great significance for the oxidative degradation of pollutants and resource recovery of waste. This study innovatively synthesized deashed biochar (DBC) by pyrolyzing municipal sludge followed by an acid washing process using a mixture of 10% hydrofluoric acid and 1 M hydrochloric acid. The mixed-acid treatment removed inorganic minerals from biochar, obviously improving the specific surface area (from 81.909 m2/g to 405.794 m2/g), average pore size (from 5.513 nm to 7.412 nm), and surface functional group content of the biochar. The DBC was utilized to activate peroxymonosulfate (PMS) for degrading sulfamethoxazole (SMX). It demonstrated markedly improved performance compared to the SBC. 59.1% of SMX was adsorbed in initial 30 min, and > 95% of SMX was degraded within the subsequent 20 min following PMS addition. Furthermore, DBC had high catalytic activity across a broad pH range, while its performance was hindered by HCO3−. Mechanism analysis indicated that the effective degradation of SMX in SBC800/PMS and DBC/PMS systems was mainly achieved through a non-radical pathway dominated by singlet oxygen (1O2). The CO, graphitic N, and pyridinic N on DBC induced the formation of electron-deficient site C(+), facilitating effective extraction of electrons from PMS, thus enhancing the production of 1O2. This study provides a new perspective for addressing the issue of low catalytic activity in biochar derived from high-ash sludge.
{"title":"Regulating the surface structure of sludge biochar by mixed-acid washing to enhance the activation of peroxymonosulfate for sulfamethoxazole removal","authors":"Zhifu Tian , Huilin Wan , Ruotong Jin , Xiaojie Qiu , Bibek Bamanu , Yingxin Zhao","doi":"10.1016/j.jwpe.2025.107123","DOIUrl":"10.1016/j.jwpe.2025.107123","url":null,"abstract":"<div><div>The exploitation of efficient sludge-derived biochar (SBC) is of great significance for the oxidative degradation of pollutants and resource recovery of waste. This study innovatively synthesized deashed biochar (DBC) by pyrolyzing municipal sludge followed by an acid washing process using a mixture of 10% hydrofluoric acid and 1 M hydrochloric acid. The mixed-acid treatment removed inorganic minerals from biochar, obviously improving the specific surface area (from 81.909 m<sup>2</sup>/g to 405.794 m<sup>2</sup>/g), average pore size (from 5.513 nm to 7.412 nm), and surface functional group content of the biochar. The DBC was utilized to activate peroxymonosulfate (PMS) for degrading sulfamethoxazole (SMX). It demonstrated markedly improved performance compared to the SBC. 59.1% of SMX was adsorbed in initial 30 min, and > 95% of SMX was degraded within the subsequent 20 min following PMS addition. Furthermore, DBC had high catalytic activity across a broad pH range, while its performance was hindered by HCO<sub>3</sub><sup>−</sup>. Mechanism analysis indicated that the effective degradation of SMX in SBC800/PMS and DBC/PMS systems was mainly achieved through a non-radical pathway dominated by singlet oxygen (<sup>1</sup>O<sub>2</sub>). The C<img>O, graphitic N, and pyridinic N on DBC induced the formation of electron-deficient site C<sup>(+)</sup>, facilitating effective extraction of electrons from PMS, thus enhancing the production of <sup>1</sup>O<sub>2</sub>. This study provides a new perspective for addressing the issue of low catalytic activity in biochar derived from high-ash sludge.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107123"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.jwpe.2025.107137
Jian Zhou , Huiru Li , Chengjia Wei , Yan Kong , Yanhong Li , Xuemin Zhang , Xinyang Zhou
In this study, a Ti/PbO2-La-PVP electrode was prepared by electrodeposition technique for the efficient degradation of phenol by electrochemical oxidation. The rare earth element La has good ductility and during electrolysis forms cavities, vacancies and other defects on the surface of the anode to change and improve the performance of the electrode; Polyvinylpyrrolidone (PVP), as a nonionic surfactant, can prevent the agglomeration of PbO2 particles, thus increasing the active sites to improve the electrocatalytic efficiency of the electrode. The prepared Ti/PbO2-La-PVP electrode has a dense and uniform tetrahedral surface with the highest oxygen evolution potential (2.67 V), the largest voltammetric charge capacity (72.31 mC·cm−2), the smallest charge transfer resistance (13 Ω·cm−2), the longest accelerated lifetime (78 h), and 7.5 times higher •OH production than the unmodified electrode. The optimum process conditions for phenol degradation were investigated, including initial phenol concentration of 1200 mg·L−1, electrolyte concentration of 4.0 g·L−1, current density of 25 mA·cm−2, electrode spacing of 2.0 cm, Under these conditions, phenol removal rate reached 97.82 % and TOC mineralization rate reached 94.80 % within 180 min. Further, A degradation mechanism is proposed based on intermediate species (catechol, succinic acid, and acrylic acid) identified by HPLC-MS.
{"title":"Significant improvement in the phenol degradation performance of Ti/PbO2 electrode through La and PVP co-doping strategy","authors":"Jian Zhou , Huiru Li , Chengjia Wei , Yan Kong , Yanhong Li , Xuemin Zhang , Xinyang Zhou","doi":"10.1016/j.jwpe.2025.107137","DOIUrl":"10.1016/j.jwpe.2025.107137","url":null,"abstract":"<div><div>In this study, a Ti/PbO<sub>2</sub>-La-PVP electrode was prepared by electrodeposition technique for the efficient degradation of phenol by electrochemical oxidation. The rare earth element La has good ductility and during electrolysis forms cavities, vacancies and other defects on the surface of the anode to change and improve the performance of the electrode; Polyvinylpyrrolidone (PVP), as a nonionic surfactant, can prevent the agglomeration of PbO<sub>2</sub> particles, thus increasing the active sites to improve the electrocatalytic efficiency of the electrode. The prepared Ti/PbO<sub>2</sub>-La-PVP electrode has a dense and uniform tetrahedral surface with the highest oxygen evolution potential (2.67 V), the largest voltammetric charge capacity (72.31 mC·cm<sup>−2</sup>), the smallest charge transfer resistance (13 Ω·cm<sup>−2</sup>), the longest accelerated lifetime (78 h), and 7.5 times higher •OH production than the unmodified electrode. The optimum process conditions for phenol degradation were investigated, including initial phenol concentration of 1200 mg·L<sup>−1</sup>, electrolyte concentration of 4.0 g·L<sup>−1</sup>, current density of 25 mA·cm<sup>−2</sup>, electrode spacing of 2.0 cm, Under these conditions, phenol removal rate reached 97.82 % and TOC mineralization rate reached 94.80 % within 180 min. Further, A degradation mechanism is proposed based on intermediate species (catechol, succinic acid, and acrylic acid) identified by HPLC-MS.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107137"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.jwpe.2025.107249
Cheng Tang , Yaqian Zhao , Chun Kang , Yanhui Li , David Morgan
Microbial fuel cell-constructed wetland (MFC-CW) coupling system is a kind of bio-electrochemical intensified CW system which upgrades CW into multi-functional wastewater treatment technology. Achieving robust electrical energy output is one of the critical challenges in MFC-CW. However, some critical factors limited power output of MFC-CW in terms of reactions on electrode. These inhibited cathodic reactions were mainly due to insufficient oxygen supporting and great overpotential of anode because of the excessive oxygen diffusion. This study reports a novel siphon containing MFC-CW and its operational strategy (namely a full siphon recirculation (FSR) mode), to boost power output of the MFC-CW. Consecutive tidal flow (TF) cycles were established by FSR in cathode chamber which contributed to the better performances of both the cathode and the anode. Results show that the highest power density, coulombic efficiency (CE) and normalized energy recovery (NER) in FSR mode were 1.15 mW/L, 19.28 %, 128.15 Wh/kg COD, respectively. Power output of MFC-CW with FSR mode were remarkable high and sustainable compared with other MFC-CW studies with normalized assessment criteria. FSR mode simultaneously shows advantages over the high cathode potential and low anode potential. This novel structure and the operation strategy can be regarded as a smart choice to level up power output of MFC-CW system.
{"title":"Achieving high energy harvest from a siphon boosted microbial fuel cell-constructed wetland system","authors":"Cheng Tang , Yaqian Zhao , Chun Kang , Yanhui Li , David Morgan","doi":"10.1016/j.jwpe.2025.107249","DOIUrl":"10.1016/j.jwpe.2025.107249","url":null,"abstract":"<div><div>Microbial fuel cell-constructed wetland (MFC-CW) coupling system is a kind of bio-electrochemical intensified CW system which upgrades CW into multi-functional wastewater treatment technology. Achieving robust electrical energy output is one of the critical challenges in MFC-CW. However, some critical factors limited power output of MFC-CW in terms of reactions on electrode. These inhibited cathodic reactions were mainly due to insufficient oxygen supporting and great overpotential of anode because of the excessive oxygen diffusion. This study reports a novel siphon containing MFC-CW and its operational strategy (namely a full siphon recirculation (FSR) mode), to boost power output of the MFC-CW. Consecutive tidal flow (TF) cycles were established by FSR in cathode chamber which contributed to the better performances of both the cathode and the anode. Results show that the highest power density, coulombic efficiency (CE) and normalized energy recovery (NER) in FSR mode were 1.15 mW/L, 19.28 %, 128.15 Wh/kg COD, respectively. Power output of MFC-CW with FSR mode were remarkable high and sustainable compared with other MFC-CW studies with normalized assessment criteria. FSR mode simultaneously shows advantages over the high cathode potential and low anode potential. This novel structure and the operation strategy can be regarded as a smart choice to level up power output of MFC-CW system.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107249"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.jwpe.2025.107161
Gaowei Guo , Turghun Muhammad , Yiting Hu , Aikebaier Reheman
Fixed-bed adsorption technology is one of the most important methods for removing pollutants like auramine O (AO) dye from environmental water. Traditionally, breakthrough curves are derived from laborious manual processes including effluent collection, sampling, and offline analysis, prone to significant errors and data scarcity. Herein, a fiber-optic sensing technique for online, real-time monitoring was applied to plot breakthrough curves during fixed-bed adsorption, addressing this inherent problem. A synthesized non-imprinted polymers (NIPs) adsorbent achieved adsorption capacity comparable to that of molecularly imprinted polymers. The adsorption capacity was 203.99 mg/g at a feed concentration of 15 mg/L, a feed flow rate of 3 mL/min, an adsorbent mass of 30 mg, a solution pH of 3, and a particle size range of 38–75 μm. Kinetic studies showed that the Dose-Response model was more suitable for predicting the adsorption of AO on NIPs. The adsorption capacity did not change significantly (RSD = 2.39 %) in 30 cycles of regeneration experiments on the NIPs fixed-bed. The technique offers the advantages of online detection and real-time monitoring, making it suitable for application in the adsorption and removal processes of environmental pollutants.
{"title":"Fixed-bed adsorption kinetics study of auramine O dye on non-imprinted polymers based on a real-time monitoring system","authors":"Gaowei Guo , Turghun Muhammad , Yiting Hu , Aikebaier Reheman","doi":"10.1016/j.jwpe.2025.107161","DOIUrl":"10.1016/j.jwpe.2025.107161","url":null,"abstract":"<div><div>Fixed-bed adsorption technology is one of the most important methods for removing pollutants like auramine O (AO) dye from environmental water. Traditionally, breakthrough curves are derived from laborious manual processes including effluent collection, sampling, and offline analysis, prone to significant errors and data scarcity. Herein, a fiber-optic sensing technique for online, real-time monitoring was applied to plot breakthrough curves during fixed-bed adsorption, addressing this inherent problem. A synthesized non-imprinted polymers (NIPs) adsorbent achieved adsorption capacity comparable to that of molecularly imprinted polymers. The adsorption capacity was 203.99 mg/g at a feed concentration of 15 mg/L, a feed flow rate of 3 mL/min, an adsorbent mass of 30 mg, a solution pH of 3, and a particle size range of 38–75 μm. Kinetic studies showed that the Dose-Response model was more suitable for predicting the adsorption of AO on NIPs. The adsorption capacity did not change significantly (RSD = 2.39 %) in 30 cycles of regeneration experiments on the NIPs fixed-bed. The technique offers the advantages of online detection and real-time monitoring, making it suitable for application in the adsorption and removal processes of environmental pollutants.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107161"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.jwpe.2025.107235
Zobia Khatoon , Suiliang Huang , Adeel Ahmed Abbasi
Traditional chemical approaches to control Microcystis aeruginosa often struggle to define optimal treatment conditions resulting in inconsistent outcomes. Previous research largely depended on single-source data, significantly compromising generalizability of these findings. These studies overlooked comparisons among various machine learning models. To address these limitations, we integrated experimental data from multiple sources for the first time and applied various machine learning models to predict removal efficiency. This research enhances chemical treatment efficiency through data driven optimization of critical factors such as time and dosage required for effective Microcystis aeruginosa removal, removing uncertainties in traditional experimental studies. Another key point of novelty is to extract key features influencing output, which have not been quantitatively explored in earlier studies. The study observed variability in removal time, dosage and efficiency rates, with an average removal efficiency of 50.03 %. Random Forest Regressor and Bagging Regressor were recommended as optimum models, demonstrating their effectiveness in accurately predicting removal efficiency based on the given dataset. Our findings indicate that removal efficiency was most sensitive during initial 0–500 min of treatment and at dosages below 250 mg/L. The optimal dosage range of 0–250 mg/L was identified, with significant drops in removal efficiency beyond this range, indicating potential risks of reduced effectiveness and adverse effects at higher concentrations. The study also underscores the potential of photocatalysts, heterogeneous catalysts, and the chemical Bi2O3 in optimizing removal efficiency. This predictive framework provides decision-makers with essential tools for effectively predicting the efficiency of chemical mitigation strategies against harmful algal blooms.
{"title":"Machine learning-driven predictive frameworks for optimizing chemical strategies in Microcystis aeruginosa mitigation","authors":"Zobia Khatoon , Suiliang Huang , Adeel Ahmed Abbasi","doi":"10.1016/j.jwpe.2025.107235","DOIUrl":"10.1016/j.jwpe.2025.107235","url":null,"abstract":"<div><div>Traditional chemical approaches to control <em>Microcystis aeruginosa</em> often struggle to define optimal treatment conditions resulting in inconsistent outcomes. Previous research largely depended on single-source data, significantly compromising generalizability of these findings. These studies overlooked comparisons among various machine learning models. To address these limitations, we integrated experimental data from multiple sources for the first time and applied various machine learning models to predict removal efficiency. This research enhances chemical treatment efficiency through data driven optimization of critical factors such as time and dosage required for effective <em>Microcystis aeruginosa</em> removal, removing uncertainties in traditional experimental studies. Another key point of novelty is to extract key features influencing output, which have not been quantitatively explored in earlier studies. The study observed variability in removal time, dosage and efficiency rates, with an average removal efficiency of 50.03 %. Random Forest Regressor and Bagging Regressor were recommended as optimum models, demonstrating their effectiveness in accurately predicting removal efficiency based on the given dataset. Our findings indicate that removal efficiency was most sensitive during initial 0–500 min of treatment and at dosages below 250 mg/L. The optimal dosage range of 0–250 mg/L was identified, with significant drops in removal efficiency beyond this range, indicating potential risks of reduced effectiveness and adverse effects at higher concentrations. The study also underscores the potential of photocatalysts, heterogeneous catalysts, and the chemical Bi<sub>2</sub>O<sub>3</sub> in optimizing removal efficiency. This predictive framework provides decision-makers with essential tools for effectively predicting the efficiency of chemical mitigation strategies against harmful algal blooms.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107235"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.jwpe.2025.107202
Van Doan Nguyen, Thi Phuong Nguyen, Anh-Tuan Vu
Recently, the use of natural materials to treat pollutants, especially heavy metals in water, has received significant attention in research. In this report, lettuce leaves (LC), an environmentally friendly and cost-effective biosorbent, were chemically modified with NaOH and ethylenediaminetetraacetic acid (EDTA) for the first time in two steps to remove Pb2+. The compositional and structural properties of the LC/NaOH/EDTA (LCNE) biosorbent were ascertained by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The effects of diverse operating conditions including working environment pH, sorbate concentration, sorbent mass, modifier content, and working temperature were tested. The experimental results estimated that at pH 6, 91.22 % of Pb2+ at 80 mg/L concentration was adsorbed by 1.0 g/L sorbent. The second-order kinetic provided better linearity (R2 = 0.999) to depict the chemisorption, whereas the biosorption isotherm closely followed the Langmuir model, revealing a maximum uptake capacity of 117.51 mg/g. In the multi-metal biosorption system, the biosorption capacity of Pb2+ was 81.98 mg/g compared to only 26.63 mg/g of Ni2+. Our report revealed that Pb2+ adsorption was moderately stable after many regeneration cycles, i.e., it decreased by almost 20 % after 3 consecutive cycles of immersion in harsh environments. In addition, the efficiency of LCNE in removing Pb2+ from urban wastewater sample was tested, with 72.48 % of Pb2+ being adsorbed by the biosorbent. These results underline that LNCE is a biosorbent with excellent application potential for the on-site sequestration of Pb2+ ions.
{"title":"Chemical modification of lettuce leaves using NaOH and EDTA: A brilliant biosorbent for the adsorption of heavy metal ions from aqueous solution","authors":"Van Doan Nguyen, Thi Phuong Nguyen, Anh-Tuan Vu","doi":"10.1016/j.jwpe.2025.107202","DOIUrl":"10.1016/j.jwpe.2025.107202","url":null,"abstract":"<div><div>Recently, the use of natural materials to treat pollutants, especially heavy metals in water, has received significant attention in research. In this report, lettuce leaves (LC), an environmentally friendly and cost-effective biosorbent, were chemically modified with NaOH and ethylenediaminetetraacetic acid (EDTA) for the first time in two steps to remove Pb<sup>2+</sup>. The compositional and structural properties of the LC/NaOH/EDTA (LCNE) biosorbent were ascertained by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The effects of diverse operating conditions including working environment pH, sorbate concentration, sorbent mass, modifier content, and working temperature were tested. The experimental results estimated that at pH 6, 91.22 % of Pb<sup>2+</sup> at 80 mg/L concentration was adsorbed by 1.0 g/L sorbent. The second-order kinetic provided better linearity (R<sup>2</sup> = 0.999) to depict the chemisorption, whereas the biosorption isotherm closely followed the Langmuir model, revealing a maximum uptake capacity of 117.51 mg/g. In the multi-metal biosorption system, the biosorption capacity of Pb<sup>2+</sup> was 81.98 mg/g compared to only 26.63 mg/g of Ni<sup>2+</sup>. Our report revealed that Pb<sup>2+</sup> adsorption was moderately stable after many regeneration cycles, i.e., it decreased by almost 20 % after 3 consecutive cycles of immersion in harsh environments. In addition, the efficiency of LCNE in removing Pb<sup>2+</sup> from urban wastewater sample was tested, with 72.48 % of Pb<sup>2+</sup> being adsorbed by the biosorbent. These results underline that LNCE is a biosorbent with excellent application potential for the on-site sequestration of Pb<sup>2+</sup> ions.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107202"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-12DOI: 10.1016/j.jwpe.2025.107176
Hui Yu , Longfei Gao , Xinyuan Zhang , Shuang Zhang , Wenshi Chi , Long Zhang , Jianzhuo Li , Yushi Tian , Hongguang Cai , Ying Zhang
Tetracycline(TC) is a typical pharmaceutical and personal care product (PPCP) that harms ecological health due to its impact on human allergic reactions, bacterial resistance, and environmental microbiota. Thus, developing environmentally friendly, efficient, and suitable methods to eliminate TC and inactivate bacteria in aquatic environments is becoming essential. A facile hydrothermal approach was developed to synthesize MgO-modified g-C3N4 composites for efficient TC removal from water. The as-prepared composites were thoroughly characterized by BET, SEM, XRD, and XPS analyses, confirming the successful incorporation of MgO into the g-C3N4 framework. Under optimal conditions (1:1 MgO/g-C3N4 ratio, 150 °C synthesis temperature), the composite achieved 84.89 % TC removal within 90 min under visible light, substantially outperforming pristine materials (MgO, g-C3N4). The composite maintained removal efficiency above 70 % after six successive cycles, demonstrating excellent stability. Mechanistic investigations identified O2•− as the dominant reactive species, with h+ playing a secondary role. Analysis of atomic Fukui indices revealed preferential radical attack at C7, O20, and N24 sites, leading to TC degradation through hydroxylation and cyclization pathways. The composite showed promising performance in actual river water treatment, suggesting potential for practical applications. This work provides insights for developing efficient photocatalytic materials for pharmaceutical pollutant removal from water.
{"title":"Enhanced removal of tetracycline from water using MgO-modified g-C3N4 composite: Synthesis optimization and mechanism investigation","authors":"Hui Yu , Longfei Gao , Xinyuan Zhang , Shuang Zhang , Wenshi Chi , Long Zhang , Jianzhuo Li , Yushi Tian , Hongguang Cai , Ying Zhang","doi":"10.1016/j.jwpe.2025.107176","DOIUrl":"10.1016/j.jwpe.2025.107176","url":null,"abstract":"<div><div>Tetracycline(TC) is a typical pharmaceutical and personal care product (PPCP) that harms ecological health due to its impact on human allergic reactions, bacterial resistance, and environmental microbiota. Thus, developing environmentally friendly, efficient, and suitable methods to eliminate TC and inactivate bacteria in aquatic environments is becoming essential. A facile hydrothermal approach was developed to synthesize MgO-modified g-C<sub>3</sub>N<sub>4</sub> composites for efficient TC removal from water. The as-prepared composites were thoroughly characterized by BET, SEM, XRD, and XPS analyses, confirming the successful incorporation of MgO into the g-C<sub>3</sub>N<sub>4</sub> framework. Under optimal conditions (1:1 MgO/g-C<sub>3</sub>N<sub>4</sub> ratio, 150 °C synthesis temperature), the composite achieved 84.89 % TC removal within 90 min under visible light, substantially outperforming pristine materials (MgO, g-C<sub>3</sub>N<sub>4</sub>). The composite maintained removal efficiency above 70 % after six successive cycles, demonstrating excellent stability. Mechanistic investigations identified O<sub>2</sub>•<sup>−</sup> as the dominant reactive species, with h<sup>+</sup> playing a secondary role. Analysis of atomic Fukui indices revealed preferential radical attack at C<sub>7</sub>, O<sub>20</sub>, and N<sub>24</sub> sites, leading to TC degradation through hydroxylation and cyclization pathways. The composite showed promising performance in actual river water treatment, suggesting potential for practical applications. This work provides insights for developing efficient photocatalytic materials for pharmaceutical pollutant removal from water.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107176"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nature-based systems, such as constructed wetlands and photobioreactors, efficiently replicate natural processes for sustainable wastewater treatment. This study employed a hybrid methodology, combining a photobioreactor (NBS1) and a constructed wetland (NBS2) to enhance pollutant removal. The study was conducted over seven weeks (49 days) using raw wastewater from a paper pulp industry. Results indicated the system stabilized by the third week of operation. The system achieved the highest removal efficiencies at steady state, with 89 % for organic matter, 69 % for nitrogen, 59 % for phosphorus, and 81 % for total phenols. These results reflect the adaptive synergy between microalgae and bacteria in the photobioreactor, which facilitated the degradation of organic pollutants and nutrient cycling, combined with the contribution of wetlands plants in nutrient uptake and further pollutant removal. Biomass concentration in NBS1 stabilized from week 5 onwards at 600 mgVSS/L, suggesting that the microorganisms had reached a stationary growth phase. The values recorded for flocculation and sedimentation efficiency (89.7 ± 7.7 %) indicated that the biomass exhibited excellent sedimentation capacity, thus facilitating efficient biomass harvesting. Therefore, NBS1 and NBS2 offer viable nature-based solutions for industrial wastewater treatment, with low operating costs and environmental impacts, contributing to developing a circular economy in the paper pulp industry.
{"title":"Integrating photobioreactors and constructed wetlands for paper pulp industry wastewater treatment: A nature-based system approach","authors":"Josivaldo Sátiro , Leonardo Marchiori , Maria V. Morais , Talita Marinho , Lourdinha Florencio , Arlindo Gomes , Raul Muñoz , António Albuquerque , Rogério Simões","doi":"10.1016/j.jwpe.2025.107237","DOIUrl":"10.1016/j.jwpe.2025.107237","url":null,"abstract":"<div><div>Nature-based systems, such as constructed wetlands and photobioreactors, efficiently replicate natural processes for sustainable wastewater treatment. This study employed a hybrid methodology, combining a photobioreactor (NBS1) and a constructed wetland (NBS2) to enhance pollutant removal. The study was conducted over seven weeks (49 days) using raw wastewater from a paper pulp industry. Results indicated the system stabilized by the third week of operation. The system achieved the highest removal efficiencies at steady state, with 89 % for organic matter, 69 % for nitrogen, 59 % for phosphorus, and 81 % for total phenols. These results reflect the adaptive synergy between microalgae and bacteria in the photobioreactor, which facilitated the degradation of organic pollutants and nutrient cycling, combined with the contribution of wetlands plants in nutrient uptake and further pollutant removal. Biomass concentration in NBS1 stabilized from week 5 onwards at 600 mgVSS/L, suggesting that the microorganisms had reached a stationary growth phase. The values recorded for flocculation and sedimentation efficiency (89.7 ± 7.7 %) indicated that the biomass exhibited excellent sedimentation capacity, thus facilitating efficient biomass harvesting. Therefore, NBS1 and NBS2 offer viable nature-based solutions for industrial wastewater treatment, with low operating costs and environmental impacts, contributing to developing a circular economy in the paper pulp industry.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107237"},"PeriodicalIF":6.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号