Journal of water process engineering最新文献

{"title":"Multifunctional ZnFeO-based composite from iron sludge for photocatalytic degradation of azo, thiazine, anthraquinone dyes, formaldehyde and oil sorption from aqueous media","authors":"Valentin Romanovski ,&nbsp;Dmitry Kulichik ,&nbsp;Rajiv Periakaruppan ,&nbsp;Vanathi Palanimuthu ,&nbsp;Natallia V. Kulinich ,&nbsp;Vadim Popkov ,&nbsp;Alexandr Dubina ,&nbsp;Iryna V. Matsukevich ,&nbsp;Vladimir Shtepa ,&nbsp;Elena Romanovskaia","doi":"10.1016/j.jwpe.2025.108355","DOIUrl":"10.1016/j.jwpe.2025.108355","url":null,"abstract":"<div><div>This paper presents the results of the study of iron‑zinc containing photocatalysts ZnFeO-NPs obtained from sediments of groundwater deironing stations by the exothermic combustion method. Three different reducing agents were examined. X-ray phase analysis showed the presence of a predominant phase ZnFe₂O₄ (32.7–43.5 %) in all samples, as well as a significant content of magnetite (35.0–41.4 %), which confirms incomplete oxidation of iron during the synthesis, which correlates with thermodynamic calculations. The study of morphology revealed aggregated structures with a particle size of &gt;20 nm. The photocatalytic activity of the studied materials was analyzed using the example of the destruction of four dyes of different nature and formaldehyde. The best ZnFeO-U sample showed 98.7 % purification efficiency at a dose of 3000 mg/L for 45 min, which was 7.2 % higher than the control sample synthesized from pure reagents. Oil absorption capacity tests demonstrated that ZnFeO-G has the highest sorption capacity (5.598 g/g), increasing by 33 % after 5 regeneration cycles. Contact angle analysis revealed dual wettability, with ZnFeO-G being most oleophilic. Antibacterial studies revealed suppression of <em>Pseudomonas aeruginosa</em> growth (inhibition zone 19 ± 2 mm) at a concentration of 25 μg/mL, approaching the efficiency of a standard antibiotic (22 ± 0.1 mm). The obtained ZnFeO-containing nanomaterials have multifunctional properties and are promising for use in the field of wastewater treatment and oil pollution removal.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108355"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671040","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}

{"title":"Light wavelength modulation and emerging contaminant stress: Deciphering adaptive responses in microalgal-bacterial granular sludge systems","authors":"Xiaohan Li ,&nbsp;Shanshan Hou ,&nbsp;Shujuan Meng ,&nbsp;Bihui Niu ,&nbsp;Guoliang Ma ,&nbsp;Yuanli Gao ,&nbsp;Yunzong Lamu ,&nbsp;Linyan Yang ,&nbsp;Bin Ji ,&nbsp;Meng Zhang","doi":"10.1016/j.jwpe.2025.108358","DOIUrl":"10.1016/j.jwpe.2025.108358","url":null,"abstract":"<div><div>The escalating global water crisis, intensified by antibiotic contamination, presents urgent threats to ecological security and public health. Microalgal-bacterial granular sludge (MBGS) emerges as a sustainable wastewater treatment technology with inherent capabilities for phototrophic energy utilization. This study systematically investigated the treatment efficiency of MBGS and the evolution of its microbial community under different light wavelengths and the stress of emerging contaminants, amoxicillin (AMX) and ciprofloxacin (CF). Experimental results reveal that red light irradiation (620–650 nm) significantly enhances photosynthetic performance through elevated chlorophyll <em>a</em>ccumulation (26.1 mg/g) and dissolved oxygen production (21.7 mg/L). Simultaneously, it stimulates extracellular polymeric substance (EPS) biosynthesis (144.5 mg/g), thereby improving system stability and contaminant removal efficacy. In contrast, blue light conditions result in lower processing efficiency compared to alternative wavelengths. Furthermore, under high-concentration antibiotic conditions, MBGS exposed to red light showed superior contaminant removal capacity due to the adsorption and shielding effect of EPS on antibiotic toxicity. Additionally, microbial community analysis reveals that red light significantly increases the abundance of <em>Cyanobacteria</em> (52.6 % abundance), AMX favors the proliferation of <em>Cyanobacteria</em>, while CF promotes the growth of <em>Acidobacteriota</em>. These findings establish red light optimization as an effective strategy for enhancing MBGS performance in antibiotic-laden wastewater treatment, providing crucial theoretical foundations for process optimization in sustainable water remediation.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108358"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671075","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}

{"title":"Mechanisms toward visible-light degradation of fluoroquinolone in water using chitosan enhanced Cu-Cu2O photocatalysts","authors":"Meng-Wei Zheng ,&nbsp;Shou-Heng Liu","doi":"10.1016/j.jwpe.2025.108360","DOIUrl":"10.1016/j.jwpe.2025.108360","url":null,"abstract":"<div><div>The widespread use of antibiotics and their negative impact on the environment make a key challenge in wastewater treatments. In this study, Cu-Cu₂O-chitosan (Cu-Cu₂O-CTs) photocatalysts are synthesized via a simple wet chemical method for the photocatalytic degradation of antibiotics. The experimental results show the degradation efficiency of enrofloxacin (ENR) reaches 99.99 % under optimal conditions, and the catalyst retains over 70 % removal efficiency after four consecutive cycles. The enhanced photocatalytic performance of Cu-Cu₂O-CTs is primarily attributed to the incorporation of chitosan, which effectively reduces electron-hole recombination, and improves light utilization efficiency. Mechanistic analysis reveals that O₂<img>⁻ is the dominant reactive oxygen species (ROS), targeting specific active sites on the ENR molecule and ultimately leading to mineralization. Density Functional Theory (DFT) computations of the Fukui function are used to identify the two nitrogen atoms in the piperazine ring as the primary reactive sites that trigger the degradation pathway. Additionally, three distinct degradation pathways of ENR are proposed by integrating LC-MS analysis, and the toxicity of intermediates is effectively predicted. This study presents a simple and practical approach for designing Cu₂O-based photocatalysts and provides in-depth insights into the degradation mechanisms of ENR, highlighting the potential of Cu-Cu₂O-CTs for wastewater treatment.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108360"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671056","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}

{"title":"Ternary Fe3O4-CeO2/g-C3N4 nanocomposite: A magnetically reclaimable, visible light-active catalyst for efficient degradation of bisphenol A","authors":"Hussein M. Elmehdi ,&nbsp;Shamima Begum ,&nbsp;Krithikadevi Ramachandran ,&nbsp;Baskar Malathi ,&nbsp;Kamrul Hasan ,&nbsp;Raed A. Al-Qawasmeh ,&nbsp;Ihsan A. Shehadi","doi":"10.1016/j.jwpe.2025.108320","DOIUrl":"10.1016/j.jwpe.2025.108320","url":null,"abstract":"<div><div>This study reports the fabrication of magnetically recyclable visible light active Fe₃O₄-CeO₂/g-C₃N₄ nanocomposite via simple hydrothermal method. The fabricated nanocomposite showed an excellent photocatalytic activity on the degradation of organic micropollutant such as bisphenol A (BPA) under direct sunlight. Various characterization techniques revealed the formation of the Fe₃O₄-CeO₂/g-C₃N₄ nanocomposite. Furthermore, from the optical study it revealed that the band gap energy for Fe₃O₄-CeO₂/g-C₃N₄ nanocomposite was 1.9 eV. Hence, this small band gap energy depicts the capability of harvesting visible light which makes it favorable for photocatalytic activity under direct sunlight. In addition, the fabricated Fe₃O₄-CeO₂/g-C₃N₄ nanocomposite exhibits a surface area of 148.53 m²/g that is relatively greater than that of CeO₂ and Fe₃O₄ NPs (43.63 m²/g and 79.88 m²/g respectively). It has been studied that 5.0 mg of catalyst could efficiently degrade a maximum of 92.5 ± 1.2 % of 3.0 mg/L solution of BPA in 75 min under direct sunlight. The charge transfer among all three components of the prepared Fe₃O₄-CeO₂/g-C₃N₄ nanocomposite resulted in an increase in activity of the photocatalyst as the longevity of the charge carrier was increased by preventing its fast recombination. The kinetic study showed relatively high-rate constant of 3.9 × 10⁻² min⁻¹, hence the photodegradation reaction follows pseudo-first-order mechanism. The catalyst was effortlessly recovered magnetically and reused up to 7th cycles of photodegradation of BPA. Therefore, this study reveals the successful accomplishment of fabrication of magnetically recyclable visible light active Fe₃O₄-CeO₂/g-C₃N₄ nanocomposite which exhibits high photocatalytic efficiency on the degradation of BPA under direct sunlight.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108320"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671055","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}

{"title":"Efficient degradation of sulfamethazine sodium via hydrogen peroxide activation in the presence of calcite: Synergistic effect of Co(II) and Cu(II)","authors":"Ping Zhang ,&nbsp;Xinru Yang ,&nbsp;Can Wang ,&nbsp;Fuwei Sun ,&nbsp;Haibo Liu ,&nbsp;Tianhu Chen ,&nbsp;Dong Chen ,&nbsp;Ziyang Chu ,&nbsp;Jin Zhang ,&nbsp;Jian Huang ,&nbsp;Fazhi Xie","doi":"10.1016/j.jwpe.2025.108332","DOIUrl":"10.1016/j.jwpe.2025.108332","url":null,"abstract":"<div><div>The bimetallic synergistic effect plays a significant role in enhancing the efficiency of antibiotics degradation via hydrogen peroxide (H₂O₂) activation. In this study, the degradation of sulfamethazine sodium (SMT) by H₂O₂ was comprehensively explored in a system where Cu(II) and Co(II) ions synergistically activate H₂O₂ in the presence of calcite. The Cu(II)/Co(II)/calcite/H₂O₂ system using only 1.0 mg/L of Cu(II), exhibits excellent oxidation capacity, enabling complete removal of SMT within 1 h (0.085 min⁻¹). This rate is 4.5 and 23.5 times higher than those observed in the Cu(II)/calcite/H₂O₂ (0.019 min⁻¹) and Co(II)/calcite/H₂O₂ systems (0.0036 min⁻¹), respectively. According to scavenger experiments, ESR captures test, and chemical probe experiments, it is determined that Cu(III) primarily contributes to SMT degradation, rather than hydroxyl radicals (·OH), singlet oxygen (¹O₂), and high valent cobalt-oxo species [e.g. Co(IV)]. The introduction of Co(II) promotes the formation of Cu(III) by accelerating the oxidation of Cu(II). Furthermore, the degradation pathways for SMT are elucidated through UPLC-ESI-MS/MS analysis, and variations in toxicity are rigorously assessed using the ECOSAR program. In summary, this study reveals the highly effective synergistic activation of H₂O₂ by Cu(II) and Co(II) in the presence of calcite, offering new insights into the comprehensive utilization of calcite in environmental catalysis, particularly for addressing the pollution caused by coexisting heavy metals and antibiotics.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108332"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671072","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}

{"title":"Waste-to-resource synthesis of hydroxyapatite from sludge and eggshell for high-capacity copper remediation in wastewater","authors":"Li Jian,&nbsp;Wang Botao,&nbsp;Zhang Tianyou,&nbsp;Liu Tiancheng,&nbsp;Jia Lijuan","doi":"10.1016/j.jwpe.2025.108310","DOIUrl":"10.1016/j.jwpe.2025.108310","url":null,"abstract":"<div><div>Copper-contaminated wastewater poses a serious threat to ecosystems and human health, while traditional treatment methods suffer from high costs and secondary pollution issues. This study proposes a waste resource utilization strategy: utilizing sewage sludge (phosphorus source) from wastewater treatment plants and discarded eggshells (calcium source) to synthesize hydroxyapatite (HAP) via chemical precipitation, which is used for efficient removal of Cu(II) from wastewater. Adsorption experiments showed that at pH 4, 60 °C, and a dosage of 4 g·L⁻¹, HAP could achieve a 99.1 % removal rate of 500 mg· L⁻¹ Cu(II) within 2 min, with a maximum adsorption capacity of 122.5 mg·g⁻¹. Kinetic and thermodynamic analyses confirmed that adsorption follows the pseudo-second-order kinetic model (R² 0.999) and the Langmuir isotherm model, with chemical adsorption (ion exchange) as the dominant mechanism, accompanied by surface precipitation (formation of compounds such as Cu₅(PO₄)₂(OH)₄). XPS analysis indicated that copper is enriched on the HAP surface in the form of Cu(II) after adsorption. Long-term leaching experiments confirmed that the leaching rate of immobilized copper was only 0.8 %, posing a low environmental risk. Additionally, HAP can be regenerated using 0.1 M HNO₃, maintaining 91.1 % of its adsorption capacity after five cycles, and exhibits selective adsorption of Cu(II) in multi-ion coexistence systems. This material provides an efficient and sustainable solution for copper pollution control and waste valorization.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108310"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671073","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}

{"title":"Response surface methodology and improved neural network coupled with optimized pulse electrochemical oxidation for rhodamine B degradation","authors":"Bo Wang ,&nbsp;Xinyue Zhang ,&nbsp;Yujie Zhou ,&nbsp;Zekai Chen ,&nbsp;Boyu Tang ,&nbsp;Siyu Li ,&nbsp;Xiaoyi Xiong ,&nbsp;Boyao Zheng ,&nbsp;Zhexi Fan ,&nbsp;Qunhuan Cai ,&nbsp;Junwei Song ,&nbsp;Tao Xu","doi":"10.1016/j.jwpe.2025.108340","DOIUrl":"10.1016/j.jwpe.2025.108340","url":null,"abstract":"<div><div>To address the challenges of dye pollutant removal and high energy consumption in industrial wastewater treatment, a novel boron-doped diamond (BDD) electrode bidirectional pulsed alternating electrochemical oxidation (BDD-PAEO) system was developed. Key operational parameters (current density, initial pH, and reaction time) were optimized via response surface methodology (RSM) to explore their combined influence on Rhodamine B (RhB) removal efficiency (<em>Re</em>) and Electrical energy consumption (<em>EEC</em>). To enable accurate process prediction and control, an enhanced intelligent model based on improved particle swarm optimization coupled with a backpropagation neural network (improved particle swarm optimization - back propagation (IPSO-BP)) was developed. Under optimized conditions (current density: 13 A/m², pH: 1, reaction time: 66 min), the system achieved a 98.870% removal of RhB with a minimal energy input of 0.124 kWh/m³. The IPSO-BP model demonstrated strong predictive performance, with a root mean square error (RMSE) of 6.26 and a determination coefficient (<em>R</em>²) of 0.96, outperforming traditional models in both nonlinear fitting accuracy and generalization capacity. Compared with conventional direct current systems, the bidirectional pulsed alternating mode approach lowered <em>EEC</em> by 44.69% and enhanced current efficiency by 90.30%. Mechanistic studies confirmed that RhB degradation primarily proceeds via hydroxyl radical (·OH)-driven heterogeneous oxidation and direct electrochemical combustion at the electrode surface. This advanced electrochemical strategy offers a promising and energy-efficient pathway for treating refractory industrial wastewater, with practical implications for improving water quality and supporting sustainable development.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108340"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671067","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}

{"title":"Enhanced Sb(V) removal from sulfate-rich wastewater by anaerobic granular sludge: Role of AQS-loaded iron sludge-derived hydrochar","authors":"Qi Li ,&nbsp;Yanping Zhu ,&nbsp;Xiong Zheng ,&nbsp;Yinguang Chen ,&nbsp;Hongying Yuan ,&nbsp;Nan Jiang ,&nbsp;Mengying Yan ,&nbsp;Manhong Huang","doi":"10.1016/j.jwpe.2025.108366","DOIUrl":"10.1016/j.jwpe.2025.108366","url":null,"abstract":"<div><div>Antimony(V) (Sb(V)) and high concentrations of sulfate are commonly present in Sb mine drainage and Sb-containing textile wastewater. To address this challenge and achieve resource utilization, this study utilized iron sludge as a raw material. AQS-loaded iron sludge-derived hydrochar (HCQ) was synthesized via hydrothermal carbonization followed by sodium anthraquinone-2-sulfonate (AQS) loading. The study investigated the impact of sulfate on Sb(V) removal by anaerobic granular sludge (AnGS) and evaluated the role of HCQ in mitigating this effect. The findings confirmed that sulfate significantly inhibited Sb(V) removal by AnGS. However, the addition of HC or HCQ markedly enhanced Sb(V) removal rates, which were 3.29 and 3.65 times higher than the sulfate-inhibited control (S + Sb group), respectively. Notably, the removal rate in the HCQ + S + Sb group exceeded that in the HC + S + Sb group. Crucially, effluent Sb(III) concentrations were negligible in HCQ group. Mechanistic insights revealed that: (1) The surface-loaded AQS on HCQ inhibited sulfate reduction, thereby freeing electron donors and favoring Sb(V) removal. (2) The HC component stimulated AnGS to produce soluble microbial products (SMP), which alleviated sulfate inhibition and further enhanced Sb(V) removal. Thus, AQS and HC in HCQ acted synergistically to promote Sb(V) bioreduction. Additionally, HCQ improved Sb(V) adsorption within extracellular polymeric substances (EPS) and enhanced the INT-ETS activity of AnGS, both contributing to the improved performance. Finally, HCQ altered the bacterial community structure, specifically increasing the relative abundance of <em>Chloroflexi</em>, a phylum associated with Sb(V) reduction.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108366"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680504","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}

{"title":"Integrated approach to textile wastewater treatment: Investigating electrocoagulation, MBBR, and adsorption synergy","authors":"Rachmad Ardhianto ,&nbsp;Ganjar Samudro ,&nbsp;Sarwoko Mangkoedihardjo ,&nbsp;Siti Taura Isratul Izmi","doi":"10.1016/j.jwpe.2025.108364","DOIUrl":"10.1016/j.jwpe.2025.108364","url":null,"abstract":"<div><div>The textile industry generates wastewater that high in colour, chemical oxygen demand (COD), and total suspended solids (TSS), and which is difficult to process using conventional biological or chemical techniques. This study presents the performance of a pilot-scale integrated treatment system combining electrocoagulation with clarifier air flotation (EC-CAF), a moving bed biofilm reactor (MBBR), and activated carbon adsorption for the advanced treatment of textile wastewater. Real effluent (50 m³/day) was treated under optimised operating conditions. The EC-CAF unit, operating at a current density of 628.90 ± 88.28 A/m², achieved removal efficiencies of 68.1 % for COD, 97.3 % for TSS, and 98.0 % for colour. The MBBR, designed with a media surface area of 500 m²/m³ and loaded at 1.07 ± 0.72 g COD/m³·day, achieved additional COD removal of 56 ± 19.5 %. The final adsorption stage using granular activated carbon (iodine number 1000 mg/g) removed 46.2 ± 23.3 % COD, 59.2 ± 25.9 % TSS, and 65.1 ± 20.2 % colour. Overall, the integrated system reached 93.74 % COD, 99.57 % TSS, and 99.62 % colour removal. The energy consumption was 5.18 kWh/m³, while the treatment cost was USD 0.435/m³, substantially lower than that for conventional chemical coagulation–adsorption systems, which cost USD 13.21/m³. Challenges such as electrode passivation and fluctuating influent loads were managed through operational controls and buffer tanks. The study provides evidence of a cost-effective, scalable, and energy-efficient approach for reusing textile wastewater, offering scope for improvement through the integration of renewable energy and more widespread industrial uses.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108364"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671076","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}

{"title":"Dual-chamber microbial fuel cells for oilfield produced water treatment: Insights into pollutant removal and microbial community dynamics","authors":"Xiaolong Xiao ,&nbsp;Yuanliang Yang ,&nbsp;Jianqiang Tao","doi":"10.1016/j.jwpe.2025.108368","DOIUrl":"10.1016/j.jwpe.2025.108368","url":null,"abstract":"<div><div>The treatment of oilfield produced water (OPW) using dual-chamber microbial fuel cells (MFCs) was investigated to evaluate pollutant removal efficiency and microbial community dynamics. Hydrocarbon and chemical oxygen demand (COD) degradation occurred at the anode, while aerobic nitrification was facilitated at the cathode using inoculated nitrifying sludge. Over 180 days of operation, the system achieved 71.14 % COD and 70.68 % total petroleum hydrocarbons (TPHs) removal at the anode, and 75.96 % ammonia nitrogen (NH₄⁺-N) removal at the cathode. Electrochemical performance stabilized at 360.42 mV, with a peak power density of 149.38 mW/m². Microbial diversity analysis showed functional specialization: <em>Shewanella</em> dominated anode for electron transfer, while <em>Nitrosococcus</em> enriched cathode for nitrification. Co-expression network analysis highlighted increased connectivity and robustness at the cathode, suggesting enhanced stability in microbial interactions over time. The modular structure of microbial networks demonstrated key functional shifts, correlating with pollutant removal performance. These findings highlight the synergy between redox-specific microbial processes and establish dual-chamber MFCs as a promising solution for sustainable OPW treatment.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"77 ","pages":"Article 108368"},"PeriodicalIF":6.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144671068","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}