Xupicheng Ren, Xiang He, Deyong Kong, Xiaomin Hu, Fan Wang
{"title":"Characterization and biotoxicity of landfill leachate and concentrates from controlled municipal solid waste landfills.","authors":"Xupicheng Ren, Xiang He, Deyong Kong, Xiaomin Hu, Fan Wang","doi":"10.2166/wst.2025.052","DOIUrl":"https://doi.org/10.2166/wst.2025.052","url":null,"abstract":"<p><p>Landfill leachate and concentrates from nanofiltration (NF) and reverse osmosis (RO) processes pose potential environmental threats. This study investigates the seasonal variations in the physicochemical properties and acute toxicity of landfill leachate and concentrates from Shenyang, Liaoning, China. The hydrophilic matter (HyI) constituted the major component of dissolved organic matter (DOM) in landfill leachate (68.18% on average). Humic substances were enriched in NF and RO concentrates, accounting for 86.92 and 62.78%, respectively. Landfill leachate exhibited strong toxicity to <i>Artemia salina</i>, particularly in summer. Although biotreatment processes reduced toxicity, the concentrates remained toxic. Principal component analysis (PCA) revealed significant correlations between physicochemical variables and toxicity. Discriminant analysis indicated that certain variables could predict acute toxicity. This study highlights the need for effective management of landfill leachate and concentrates on mitigating environmental risks.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 8","pages":"893-906"},"PeriodicalIF":2.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144026103","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}
Nevine K Amin, Ola Abdelwahab, E-S Z El-Ashtoukhy, Mohamed Helmy Abdel-Aziz
{"title":"Comparative analysis of new natural coagulant extracts for turbidity removal in water systems.","authors":"Nevine K Amin, Ola Abdelwahab, E-S Z El-Ashtoukhy, Mohamed Helmy Abdel-Aziz","doi":"10.2166/wst.2025.044","DOIUrl":"https://doi.org/10.2166/wst.2025.044","url":null,"abstract":"<p><p>The ability of two plant materials, lupin beans and rice straw, to serve as sources of coagulation-active components for water treatment was investigated using synthetic turbid water. The functional groups, surficial architecture, and elemental composition of lupin beans and rice straw were determined using FTIR, scanning electron microscope, and X-ray (EDAX). The point of zero charges, zeta potential, and particle size distribution of aqueous extracts were measured. The optimal dosage of 50 mg/L of the lupin bean extract achieved 86.4% turbidity removal at initial turbidity of 500 NTU, pH 7, and 25 °C. Similarly, rice straw extract achieved 63.3% removal under the same conditions. The coagulation efficiency of both extracts improved with higher initial turbidity and temperatures between 20 and 40 °C, and their performance was unaffected by pH variations. Combining natural coagulants with alum reduced alum usage by 25-50%, achieving up to 98.7% turbidity removal. These results suggest that the use of natural coagulants can effectively lower treatment costs and reduce environmental impacts associated with chemical coagulants.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 7","pages":"797-810"},"PeriodicalIF":2.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144014402","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}
Kento Nishi, Ryota Endo, Tatsushi Matsuyama, Junichi Ida
{"title":"Effect of light shielding on the photoinhibition of nitrifying bacteria immobilized on a light-shielding hydrogel.","authors":"Kento Nishi, Ryota Endo, Tatsushi Matsuyama, Junichi Ida","doi":"10.2166/wst.2025.048","DOIUrl":"https://doi.org/10.2166/wst.2025.048","url":null,"abstract":"<p><p>Microalgae-nitrifying bacterial consortia have attracted attention as energy-efficient nitrogen removal methods that do not require aeration. However, the photoinhibition of nitrifying bacteria is a hurdle to their practical application. We have developed a 'light-shielding hydrogel' that mitigates the photoinhibition of nitrifying bacteria, and it demonstrated the performance of high ammonia removal even under strong light irradiation. However, the effect of carbon black (CB) concentration in hydrogel and its optimization have not yet been examined. In this study, the light-shielding effect was evaluated by measuring the light transmitted through a light-shielding hydrogel layer and comparing the experimental and theoretical values. Increasing the CB concentration from 0.1 to 0.5% effectively reduced the light transmission from 13 to 2.5% at a thickness of 1 mm. The actual nitrification activity and the theoretical activity determined from the light transmission were close in the range of 900-1,600 μmol photons m<sup>-2</sup> s<sup>-1</sup> of irradiated light intensity. Based on these results, the theoretical predictions obtained in this study may contribute to the prediction of photoinhibition mitigation. Therefore, it is expected to provide suitable conditions for optimizing the preparation of light-shielding hydrogels and pave the way for their application in outdoor wastewater treatment processes.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 7","pages":"850-860"},"PeriodicalIF":2.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144050397","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":"Numerical simulation of the residence time distribution dynamics of a restored agricultural wetland under varying environmental conditions.","authors":"David Green, William Crumpton","doi":"10.2166/wst.2025.043","DOIUrl":"https://doi.org/10.2166/wst.2025.043","url":null,"abstract":"<p><p>This work demonstrates the development, calibration, and use of the three-dimensional Environmental Fluid Dynamics Code (EFDC) hydrodynamic and mass transport model to simulate mixing patterns and study the environmental controls on the residence time distributions of a 1.3 ha agricultural wetland in central Iowa. Incorporating time-varying flow boundary conditions and atmospheric forcing, the model was calibrated against observed state variables, including water temperatures, basin hydraulic characteristics, and dye concentrations monitored at the outlet for six tracer studies conducted under varying flow and atmospheric conditions when submersed aquatic vegetation was mostly absent from the basin. EFDC reasonably reproduced observed basin internal hydraulics, temperatures, and mass transport dynamics, with mean absolute relative errors ranging from 0.02 to 16.3%. Sensitivity analyses suggest that wind shear exerts the greatest control on the modeled, and by extension observed, RTD for this system, primarily affecting measures of short-circuiting and, to a lesser degree, basin-wide mixing, particularly in the absence of atmospheric thermal forcing. Thermal forcing was found to significantly influence short-circuiting and mixing during warmer periods, with this effect being highly influenced by wind. Transient flows nominally influenced most RTD characteristics, save for mean and median residence times.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 7","pages":"827-849"},"PeriodicalIF":2.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144044365","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}
Rodolphe Vautherin, Hélène Métivier, Anne Reguer, Hassen Benbelkacem
{"title":"Use of a numerical model to evaluate SO<sub>2</sub> absorption efficiency by sodium sulfite in packed and spray columns.","authors":"Rodolphe Vautherin, Hélène Métivier, Anne Reguer, Hassen Benbelkacem","doi":"10.2166/wst.2025.049","DOIUrl":"https://doi.org/10.2166/wst.2025.049","url":null,"abstract":"<p><p>Numerical modeling has been used extensively to simulate gas-liquid transfer of sulfur dioxide, assessing how operational parameters affect absorption efficiency in packed or spray columns. Despite individual studies on these contactors, comparative analyses on the same flue gas have been rare. This study uses a numerical model for both packed and spray columns to examine how parameters influence SO<sub>2</sub> absorption by sodium sulfite, describing packed and spray columns, is used to investigate the influence of operational parameters on SO<sub>2</sub> absorption by sodium sulfite. The model's predictions are validated against experimental data from an industrial pilot plant. Across varying conditions (<i>L</i>/<i>G</i> ratio, temperature, initial SO<sub>2</sub> content or initial S(IV) concentration), the packed column achieves higher absorption efficiencies compared to the spray column, with lower assumed energy costs due to a reduced <i>L</i>/<i>G</i> ratio. Temperature proves to be a significant factor, decreasing absorption efficiency by approximately 40% between 40 and 70 °C. SO<sub>2</sub> absorption efficiency declines with increasing concentrations of bisulfite and sulfite ions in the absorption solution, dropping to 50% at an S(IV) concentration of 2 kmol m<sup>-3</sup> in the liquid phase. Considering the objective of producing a concentrated bisulfite solution and a clean gas, a two-column system is recommended: one for bisulfite solution concentration at acidic pH and the other for gas purification enhancement at basic pH.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 8","pages":"907-922"},"PeriodicalIF":2.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144037068","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}
J A van der Werf, V Pons, Kelsey Smyth, B Shi, P Lechevallier, E M H Abdalla, E Andrusenko, I Broekhuizen, G B Cavadini, A F Cortés Moreno, E Cristiano, R D'Ambrosio, A M Droste, M Evangelisti, G Fernandes, A Garzón, E Girot, L Guericke, W Liao, P Mazzoglio, A Mittal, A Müller, J Naves, M Oberascher, E Okwori, J I Perez-Alvarino, S Pritsis, M Regueiro-Picallo, B Roghani, V J Taguchi, O Wani, H Wei, T Yıldızlı, H Z Yerima
{"title":"Flooded with potential: urban drainage science as seen by early-career researchers.","authors":"J A van der Werf, V Pons, Kelsey Smyth, B Shi, P Lechevallier, E M H Abdalla, E Andrusenko, I Broekhuizen, G B Cavadini, A F Cortés Moreno, E Cristiano, R D'Ambrosio, A M Droste, M Evangelisti, G Fernandes, A Garzón, E Girot, L Guericke, W Liao, P Mazzoglio, A Mittal, A Müller, J Naves, M Oberascher, E Okwori, J I Perez-Alvarino, S Pritsis, M Regueiro-Picallo, B Roghani, V J Taguchi, O Wani, H Wei, T Yıldızlı, H Z Yerima","doi":"10.2166/wst.2025.045","DOIUrl":"https://doi.org/10.2166/wst.2025.045","url":null,"abstract":"<p><p>This opinion paper reflects on the current challenges facing urban drainage systems (UDS) research, along with solutions for fostering sustainable development. Over the course of a year-long project involving 92 participants aged 24-38, including PhD candidates, post-doctoral researchers, and early-career academics, we identified critical challenges and opportunities for the sustainable development of UDS. Our exploration highlights four key challenges: limited public visibility leading to resource constraints, insufficient collaboration across subfields, issues with data scarcity and data sharing, and geographical specificities. We emphasise the importance of raising public and political awareness regarding UDS's vital role in climate adaptation and urban resilience, advocating for blue-green infrastructure and open data practices. Additionally, we address systemic academic barriers that hinder innovative research. We call for a shift away from metrics that prioritise quantity over quality. We recommend establishing stable career pathways that empower early-career researchers. This paper aims to catalyse a broader community dialogue about the future of UDS research, uniting voices from various career stages. By presenting actionable recommendations, we aim to inspire fundamental changes in research conduct, evaluation, and sustainability, ensuring the field of UDS is prepared to meet pressing urban water management challenges worldwide.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 7","pages":"861-875"},"PeriodicalIF":2.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144064882","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}
Christophoros Christophoridis, Myrto Touloupi, Erasmia A Bizani, Dimitri Iossifidis
{"title":"Polyphenol extraction from industrial water by-products: a case study of the ULTIMATE project in the fruit processing industry.","authors":"Christophoros Christophoridis, Myrto Touloupi, Erasmia A Bizani, Dimitri Iossifidis","doi":"10.2166/wst.2025.015","DOIUrl":"10.2166/wst.2025.015","url":null,"abstract":"<p><p>This study investigates the sustainable management and utilization of water resources in the fruit processing industry, focusing on a case study from the EU-funded ULTIMATE project. Conducted in a juice factory in Nafplio, Greece, the primary objective is to explore the recovery of polyphenols from water by-product streams generated during orange juice production. The research aims to evaluate the effectiveness of a mobile wastewater treatment unit in selectively adsorbing polyphenols onto a polymeric resin. The following three extraction methods are compared: conventional solvent extraction, subcritical water extraction (SWE), and supercritical CO<sub>2</sub> extraction (SFE). To determine the most efficient extraction method, the polyphenol profiles of the extracts were analyzed using UHPLC-Q-Orbitrap-MS/MS, identifying flavonoids, terpenes, coumarins, and anthocyanins. SFE not only was the most efficient method but provided the most diverse and abundant profile. The research highlights the potential of converting industrial by-products that would otherwise be treated as wastewater, into valuable resources that generate revenue, promote circular economy practices, and enhance sustainability in the fruit and vegetable processing sector. The economic viability of polyphenol extraction is also discussed, emphasizing its significance and impact on various industries. The findings support integrating advanced extraction technologies to maximize resource recovery and minimize environmental impact.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 5","pages":"540-553"},"PeriodicalIF":2.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143634625","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":"Response surface methodology to investigate the effects of operational parameters on membrane bioreactor.","authors":"Sarra Kitanou, Mustapha Tahaikt, Mohamed Taky, Azzedine Elmidaoui","doi":"10.2166/wst.2025.031","DOIUrl":"10.2166/wst.2025.031","url":null,"abstract":"<p><p>Performance modeling of wastewater treatment systems has now become an attractive area of investigation for the design, analysis, and optimization of operations. Mathematical modeling of membrane bioreactor (MBR) treatment is a powerful tool for predicting effluent quality. In this study, a bioreactor coupled with a membrane filtration process (MBR) was employed to treat municipal wastewater. An experimental design based on the response surface methodology (RSM) was applied to investigate the effects of operating conditions, such as hydraulic retention time (HRT), aeration rate (AR), and transmembrane pressure (TMP), on the removal efficiencies of chemical oxygen demand (COD), total suspended solids (TSS), and total nitrogen (TN). The results demonstrated a strong agreement between experimental data and model predictions. Furthermore, the RSM results display the effects of the operating parameters and their interactive effects on pollution removal. The maximum removal efficiency was achieved, exhibiting 95% of COD, 99.7% of TSS, and 93% of TN. These findings provide the effective use of statistical modeling to enhance MBR process performance, achieving sustainable and energy-efficient conditions.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 5","pages":"453-468"},"PeriodicalIF":2.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143634658","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":"Ternary micro-electrolysis filter media for efficient PFOA removal in water: synthesis, characterization, and performance study.","authors":"Shuilian Li, Lishan Zhang, Shan Zhong, Jiayan Zhu, Zengxian Wei","doi":"10.2166/wst.2025.033","DOIUrl":"10.2166/wst.2025.033","url":null,"abstract":"<p><p>This study reports the preparation of granular ternary micro-electrolysis materials and their effectiveness in removing the emerging contaminant PFOA. Al/nZVI/C@F granules were synthesized using a liquid-phase reduction method combined with high-temperature calcination. By comparing the removal of methylene blue dye by granules, the optimum preparation conditions were determined as follows: Fe:C = 5:1, fly ash = 50%, calcination temperature = 800 °C, and holding time = 1 h. Static batch experiments revealed that under optimal conditions (PFOA concentration = 25 mg/L, solid-liquid ratio = 30 g/L, pH = 3, reaction temperature = 15 °C), Al/nZVI/C@F achieved a PFOA removal rate of 97.83%. The removal efficiency of Al/nZVI/C@F (93.90%) was significantly higher than that of commercial iron-carbon (12.75%). After 45 days of dynamic column experiments, the removal efficiency of nZVI/C@F and Al/nZVI/C@F for PFOA (50 mg/L) remained above 60%, demonstrating strong practical application potential. Further adsorption-desorption experiments revealed that nZVI/C@F and Al/nZVI/C@F primarily removed 50 mg/L PFOA through adsorption. For a lower PFOA concentration of 0.5 mg/L, the defluorination rates were 53.2% for nZVI/C@F and 68.9% for Al/nZVI/C@F. High-performance liquid chromatography-tandem mass spectrometry was used to analyze the intermediates formed during PFOA removal, leading to a proposed degradation pathway.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 5","pages":"609-625"},"PeriodicalIF":2.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143634668","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}
Yong Tu, Yong Chen, Xiaoyue Zhang, Yunhao Xu, Yixuan Zhang, Tao Cui, Boming Fu
{"title":"Integrated electrodialysis/electro-oxidation process for the treatment of chlorpyrifos wastewater with high energy efficiency.","authors":"Yong Tu, Yong Chen, Xiaoyue Zhang, Yunhao Xu, Yixuan Zhang, Tao Cui, Boming Fu","doi":"10.2166/wst.2025.021","DOIUrl":"10.2166/wst.2025.021","url":null,"abstract":"<p><p>A novel integration of the electrochemical process with electrodialysis and electro-oxidation (IEDEO) was designed for the effective pretreatment of chlorpyrifos manufacturing wastewater, with high concentrations of both salts and organic compounds. The effects of operating parameters including initial pH and constant voltage on the IEDEO process performance were investigated. The IEDEO process showed excellent performance for the simultaneous removal of bio-refractory organics and inorganics in the chlorpyrifos wastewater. In contrast with the single EO process, the results of energy consumption, UV-vis spectra, and GC-MS showed that the oxidation performance for chlorpyrifos wastewater by IEDEO was carried out more efficiently. The biodegradability of the chlorpyrifos wastewater pretreated by IEDEO was significantly improved. The total salt removal (90.3 ± 2.1%) from the chlorpyrifos wastewater obtained by IEDEO was significantly higher than the 5.8 ± 1.6% removal attained with the EO process. The COD removal of chlorpyrifos wastewater by the IEDEO process was 25.5 ± 1.2%, and the energy consumption of the IEDEO process was 15.1 ± 1.6 kWh kg<sup>-1</sup> COD at 2 h, representing a 60-65% reduction compared to the EO process. This indicated that the IEDEO process was a valuable pretreatment technique for biological treatment. Moreover, scanning electron microscopy and X-ray diffraction results demonstrated that the IEDEO concentrate was beneficial for subsequent evaporative desalination.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"91 5","pages":"639-653"},"PeriodicalIF":2.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143634650","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}