{"title":"Monitoring and attenuation dynamics of riverine surface waters contaminated by petroleum hydrocarbons under conflict-affected conditions: processes, kinetics and implications for SDG achievement.","authors":"Oleg Mandryk, Olha Biedunkova, Pavlo Kuznietsov, Marіana Stah, Mykola Khovanets","doi":"10.2166/wst.2026.247","DOIUrl":"10.2166/wst.2026.247","url":null,"abstract":"<p><p>This study examines the temporal dynamics of petroleum hydrocarbon contamination and natural attenuation processes in riverine surface waters affected by military-related accidental pollution. Time-series monitoring data from six rivers located in eastern and western regions were analysed to quantify concentration exceedances, rates of decline, and differences in self-purification capacity among river systems. Petroleum hydrocarbon concentrations were determined using a standardised fluorimetric method, and their temporal behaviour was evaluated through descriptive statistics and first-order kinetic modelling. Extremely high peak concentrations were recorded following accidental releases, exceeding regulatory thresholds for fisheries and domestic water use by one to two orders of magnitude. Although a consistent decreasing trend was observed in all rivers, median and mean concentrations in several cases remained above regulatory limits for extended periods. Estimated half-times of concentration reduction varied markedly among rivers, reflecting differences in hydrological conditions, channel morphology, urbanisation, and dilution capacity. The results demonstrate that natural attenuation plays a significant role in reducing petroleum hydrocarbon levels, but is insufficient to fully offset the impacts of large-scale and repeated pollution events under conflict conditions. These findings highlight the need for integrated monitoring, targeted mitigation measures, and long-term restoration strategies to support sustainable water management during post-conflict recovery.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 7","pages":"1082-1099"},"PeriodicalIF":2.8,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147692637","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}
Hadeel Hosney, Mostafa Elshourbagy, Thomas V Wagner, Eleonora L Borén, Piet N L Lens
{"title":"Efficacy of biochar from mixed biomass resources for the removal of pharmaceutical residues from treated domestic wastewater.","authors":"Hadeel Hosney, Mostafa Elshourbagy, Thomas V Wagner, Eleonora L Borén, Piet N L Lens","doi":"10.2166/wst.2026.251","DOIUrl":"10.2166/wst.2026.251","url":null,"abstract":"<p><p>Biochar-based sorption has gained popularity for pharmaceutical residues removal; nonetheless, its performance is heavily dependent on feedstock selection, biomass characteristics, and operating conditions. Therefore, this study assesses the performance of biochar derived from several mixed biomass resources and addresses its applicability for use in nature-based treatment systems. Batch sorption studies were conducted on eight biochar types derived from softwood, bagasse, and coffee husk to assess their capacity to remove five pharmaceuticals. The experimental study was carried out in two phases. Phase 1 consisted of a screening, where softwood-bagasse biochar (50:50) was found to be the most efficient material among the eight chosen sorbents, with removal efficiencies of up to 97%. In phase two, response surface method (RSM) was employed to evaluate the individual and interactive effects of contact time, sorbent dose, and initial pharmaceutical concentration. The empirical statistical models revealed critical operational trade-offs, with removal efficiencies exceeding 90% at longer contact times (24-30 h) and higher biochar dosages (up to 2 g). The softwood-bagasse biochar's higher sorption performance was attributed to enhanced carbonization and aromaticity, as reflected by a low H/C ratio (0.31). This indicates that condensed carbon structure favours hydrophobic partitioning and π-π interactions with aromatic pharmaceutical molecules.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 7","pages":"1061-1081"},"PeriodicalIF":2.8,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147692564","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":"Microbial mechanisms of rapid startup in a sequencing batch biofilm reactor treating high-ammonia slaughterhouse wastewater.","authors":"Ningqian Zhang, Qinxiang Fang, Yu Wang, Qi Wang","doi":"10.2166/wst.2026.242","DOIUrl":"10.2166/wst.2026.242","url":null,"abstract":"<p><p>Traditional processes for treating high-ammonia slaughterhouse wastewater face challenges of long start-up periods and poor shock load resistance. This study established a sequencing batch biofilm reactor (SBBR) to achieve rapid start-up and elucidate the underlying microbial mechanisms. Through integrated analysis of reactor performance, microbial community succession, and functional gene dynamics, the system achieved stable removal of ammonia nitrogen (NH<sub>3</sub>-N) (>90%) and chemical oxygen demand (COD) within 20 days, marking a rapid functional start-up. After 50 days, the system demonstrated excellent resistance to influent fluctuations. Full biofilm maturation and microbial specialization were accomplished within 80 days, yielding high mean removal efficiencies of 93.04% for NH<sub>3</sub>-N, 79.38% for COD, and 58.47% for total nitrogen. Microbial analysis revealed a distinct ecological succession from initial <i>Proteobacteria</i> dominance to mature-phase specialization, characterized by significant enrichment of <i>Thermomonas</i> (11.06%) and <i>Flavobacterium</i> (10.16%) capable of heterotrophic nitrification and aerobic denitrification. Functional gene annotation showed marked upregulation of energy metabolism, lipid metabolism, and glycan biosynthesis pathways in the mature biofilm, enabling efficient degradation of complex organics and robust biofilm structure. These findings demonstrate that SBBR achieves rapid start-up through directed microbial succession and metabolic specialization, providing important insights for the optimization of high-ammonia wastewater treatment systems.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"804-816"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575601","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":"Synergizing process efficiency and environmental sustainability in a pilot-scale anaerobic digestion system for volatile fatty acid recovery from waste.","authors":"Dilara Yalcinkaya, Isaac Owusu-Agyeman, Nilay Elginoz, Zeynep Cetecioglu, Fatos Germirli Babuna","doi":"10.2166/wst.2026.240","DOIUrl":"10.2166/wst.2026.240","url":null,"abstract":"<p><p>Volatile fatty acids (VFAs) are valuable industrial inputs traditionally produced through petrochemical routes. Converting waste into VFAs offers a sustainable and environmentally responsible alternative. To identify optimal operational conditions, pilot-scale treatability studies are essential. This study evaluates the environmental performance of such a pilot anaerobic digestion system using life cycle assessment (LCA) to reveal the sustainable treatment condition. LCA modeling was conducted in GaBi software with the Ecoinvent database, applying the CML2001 method for impact assessment. The pilot plant inhibits the methanogenesis to efficiently yield VFA-rich liquid from primary sludge and food waste. System boundaries cover electricity and chemical inputs, the anaerobic digestion process, and sludge incineration, following a gate-to-gate approach. By integrating treatability results with LCA outcomes, this study identifies the most environmentally favorable operating conditions and underscores the importance of impact assessment before scaling waste-to-VFA technologies to full-scale applications. Although quantifying the financial cost of environmental burdens remains challenging, linking efficiency with environmental performance highlights the industrial significance of this work.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"793-803"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575332","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":"Bernoulli-induced self-cleaning in drainage pipes: visual micro-Venturi validation.","authors":"Guangyang Wang","doi":"10.2166/wst.2026.243","DOIUrl":"10.2166/wst.2026.243","url":null,"abstract":"<p><p>Standard methods of removing sediment from drainage systems consume significant amounts of energy. This study evaluates a passive self-cleaning mechanism that is operated by the Bernoulli principle through a Venturi contraction, using little or no additional energy. A laboratory-scale micro-Venturi was utilized to quantify the relationship between hydraulically induced wall shear stress (<i>τ</i>) and the removal rate (<i>R</i>) of a surrogate kaolinite deposit. Over the flow rate range of 1-12 L·min<sup>-1</sup>, <i>τ</i> reached a maximum of 102.1 Pa. A strong linear correlation between <i>τ</i> and <i>R</i> was observed (<i>r</i> = 0.958), with a critical shear stress <i>τ</i>_<i>c</i> ≈ 5.8 Pa sufficient to achieve over 60% deposit removal. From this conclusion, a dimensionless scaling factor, <i>Π</i> = <i>τ</i>/<i>τ</i>_<i>c</i>, is presented to help with the design and application of energy-efficient cleaning technology on other pipes of larger scale and similar geometry.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"875-884"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575642","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}
Hareef Ahmed Keerio, Sallahuddin Panhwar, Adham Mohammed Alnadish, Tasawar Ali Chandio, Tarique Ahmed Memon, Sunel Kumar, Sabab Ali Shah, Farhan Ahmed, Muhammad Muqeet
{"title":"Molecular solutions to carbon pollution: innovations, mechanisms, and challenges in solvent-based carbon capture.","authors":"Hareef Ahmed Keerio, Sallahuddin Panhwar, Adham Mohammed Alnadish, Tasawar Ali Chandio, Tarique Ahmed Memon, Sunel Kumar, Sabab Ali Shah, Farhan Ahmed, Muhammad Muqeet","doi":"10.2166/wst.2026.238","DOIUrl":"10.2166/wst.2026.238","url":null,"abstract":"<p><p>Atmospheric CO<sub>2</sub> levels exceeding 429 ppm necessitate scalable carbon capture and storage (CCS). Solvent-based absorption is the most mature technology but faces high energy demands and environmental impacts. Conventional amines such as MEA require high regeneration energy (3.5-4.0 GJ/tCO<sub>2</sub>) and degrade over time. Emerging solutions like ionic liquids, blended amines, and phase-change solvents promise improved efficiency and stability. This review links molecular-level solvent design with techno-economic performance to overcome commercialization barriers. It identifies critical gaps, including the absence of standardized life cycle and techno-economic assessments for next-generation solvents. Furthermore, molecular innovations are often insufficiently integrated with process or cluster-scale requirements, and scaling advanced materials faces supply chain and operational challenges. Transformative pathways, such as integrated capture-conversion systems, can bypass energy-intensive regeneration. By combining technical, economic, and strategic perspectives, this review provides a roadmap to guide solvent development, prioritize research, reduce deployment risks, and accelerate sustainable carbon management necessary for achieving net-zero targets.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"849-874"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575361","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}
Azzam Abuhabib, Ahmed Albahnasavi, Heba Isawi, Law Yong Ng, Abdul Wahab Mohammad, Sofiah Hamzah
{"title":"Applying machine learning and AI for nanofiltration membranes water applications: a review.","authors":"Azzam Abuhabib, Ahmed Albahnasavi, Heba Isawi, Law Yong Ng, Abdul Wahab Mohammad, Sofiah Hamzah","doi":"10.2166/wst.2026.234","DOIUrl":"10.2166/wst.2026.234","url":null,"abstract":"<p><p>Nanofiltration (NF) has long been the focus of researchers and operators in the field of water and wastewater treatment and desalination. Characterised by both high rejection of diverse substances depending on their molecular composition and charge, and high flux, NF membranes have demonstrated broad applicability while maintaining long-lasting performance. However, NF membrane scalability and reliability are intrinsically constrained by non-linear phenomena like complex solute-rejection mechanisms, long-term fouling dynamics, and the inherent flux-selectivity trade-off. Traditional mechanistic models relying on simplifying assumptions within the solution-diffusion framework, often fail to accurately predict performance in heterogeneous, real-time water matrices, leading to a critical divergence between predictive capability and operational reality. This review addresses this gap by comprehensively assessing the integration of machine learning (ML) and artificial intelligence (AI) across three critical domains: fabrication optimisation, performance prediction, and fouling diagnosis and mitigation, through the analysis of 100 NF-ML publications over the past 10 years. Additionally, it highlights key methodological challenges including data scarcity and heterogeneity, and lack of robust external validation. Finally, the review emphasises that future advancements lie in reinforcement learning for real-time adaptive control and in hybrid ML-mechanistic frameworks bridging the existing gap between data-driven prediction and transparent mechanistic understanding.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"817-848"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575598","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":"Parametric study on electro-coagulation for efficient removal of microplastics from reverse osmosis wastewater.","authors":"Jimin Kim, Jaeyoung Choi, Heekyong Oh","doi":"10.2166/wst.2026.239","DOIUrl":"10.2166/wst.2026.239","url":null,"abstract":"<p><p>Reverse osmosis is an advanced treatment technology, which shows high removal efficiencies for emerging pollutants; however, during the removal process, concentrate containing pollutants such as microplastics (MPs) is generated. Electro-coagulation (EC) offers lower chemical use, less sludge, and better removal efficiency when it comes to removing MPs. This study evaluated various EC conditions to optimize the removal of MP particles identified in the reverse osmosis wastewater exceeding 1,000 ea/L, with 14 types of MP polymers. Through EC batch experiments, the effects of inter-electrode distance, current density, and initial pH on turbidity and MPs removal were analyzed according to reaction time. Considering energy consumption as a priority, 95% removal rate of MPs was achieved under optimal conditions, which included an inter-electrode distance of 10 mm, a current density of 3 mA/cm<sup>2</sup>, and an initial pH of 5. Under these conditions, MPs were removed by flotation or sedimentation, depending on their density and size. Polypropylene, polyethylene, polystyrene, polymethyl methacrylate, polyurethane, polycarbonate, polyvinyl alcohol, and polyvinyl chloride were removed 100%, showing the best performance. This study suggests that EC treatment is an effective method for removing MPs and a promising treatment technology to alleviate the problem of MP pollution in wastewater treatment systems.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"903-915"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575344","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}
Haixin Duan, Dorothee Goettert, Koen Goossens, Jan Dries
{"title":"Effect of the feeding strategy on aerobic granular sludge formation and microbial selection in the treatment of real brewery wastewater.","authors":"Haixin Duan, Dorothee Goettert, Koen Goossens, Jan Dries","doi":"10.2166/wst.2026.232","DOIUrl":"10.2166/wst.2026.232","url":null,"abstract":"<p><p>Although aerobic granular sludge (AGS) technology presents a promising alternative to conventional wastewater treatment methods, its application to real industrial wastewater is often limited by complexity and variability of influent wastewater. In this study, slow feeding (SF) and fast feeding (FF) reactors were operated under different feeding configurations. Both reactors achieved successful granulation under the anaerobic/aerobic (An/A) operational strategy, resulting in high pollutant removal efficiencies (total organic carbon (TOC), chemical oxygen demand (COD), and total nitrogen (TN) > 90%) and enhanced sludge settleability (sludge volume index (SVI) < 50 mL/g). The An/A operation effectively suppressed filamentous bacteria (<1% relative abundance) and promoted the selective enrichment of the glycogen-accumulating organisms (<i>Candidatus</i>_<i>Competibacter</i>), reaching 8.4% in SF and 7.8% in FF. In contrast, aerobic/aerobic feeding led to the proliferation of filamentous bacteria growth (<i>Sphaerotilus</i> and <i>Thiothrix</i>), resulting in poor sludge settleability. Moreover, a constant organic loading rate and prolonged anaerobic period significantly promoted the enrichment of phosphorus-accumulating organisms (PAOs), with their relative abundance in FF increasing to 0.84% by Week 33, correlating with enhanced phosphorus removal performance. Overall, this study shows that AGS can be developed through microbial selection solely, independent of substrate accumulation, offering a practical guidance for treating real industrial brewery wastewater.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"885-902"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575575","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":"Development and characterization of cetylpyridinium chloride/mucilage-based composite membranes for environmental pollution control: adsorption of Alizarin Red S and antimicrobial properties.","authors":"Ibrahim A Alsayer","doi":"10.2166/wst.2026.244","DOIUrl":"10.2166/wst.2026.244","url":null,"abstract":"<p><p>This research developed composite membranes using cetylpyridinium chloride (CPC), chia seed mucilage, and PVA via probe sonication to address environmental pollution. The membranes were tested for removing Alizarin Red S (ARS) dye through batch adsorption. Characterization was done using FTIR, SEM, and contact angle analysis. Factors like pH, membrane dose, contact time, dye concentration, and temperature were studied for their effects on adsorption. Membranes M1 and M2 showed the highest adsorption capacities (384 and 383 mg/g) following the Langmuir isotherm and pseudo-first-order kinetics. Increasing CPC content improved antimicrobial activity against <i>S. aureus, E. coli</i>, and <i>Candida albicans</i>. The results demonstrate the membranes' potential as sustainable adsorbents for pollutant removal.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":"93 6","pages":"916-932"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147575577","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}