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Design, implementation, and challenges of floating treatment wetlands for wastewater treatment: A review 浮式处理湿地用于污水处理的设计、实施和挑战:综述
Pub Date : 2026-03-01 Epub Date: 2026-01-19 DOI: 10.1016/j.clwat.2026.100208
Jayanta Kumar Gogoi , Vrinda K. Kumar , K. Nirmal Das , M. Devasena , Praveena Gangadharan
Rapid population growth has significantly increased the demand for water and land and has contributed to surface water pollution and global warming. These issues can be addressed collectively through floating treatment wetlands (FTWs), which treat water bodies such as lakes, ponds, reservoirs, and stormwater systems without occupying land space. Constructed floating wetlands are a type of surface-flow wetland that generally consists of a floating platform supporting plants, with roots extending into the water. They are designed to treat various wastewaters like stormwater, sewage effluent, eutrophic lakes, streams, industrial wastewater, and tertiary wastewater from agri-food sources. The long fibrous roots either treat wastewater directly or indirectly by promoting microbial biofilm growth in the rhizosphere. With design improvements, FTWs have the potential to enhance water treatment, increase resilience to climate change, provide community benefits, and support biodiversity. Various software and analytical approaches can be used to design and predict the system's optimal treatment efficiency. The integration of technologies such as biofilm carriers, microbial fuel cells, and microbial consortia into FTWs is an emerging area of research. While FTW can reduce pollutant levels, it faces several challenges, including longer setup times, limited or uneven treatment, limited adaptability to seasonal shifts, and scalability and maintenance issues that must be addressed for large-scale use. This review examines FTW's design criteria, modelling tools, treatment mechanisms, obstacles to practical application, emerging innovations, and future innovations.
人口的快速增长大大增加了对水和土地的需求,并造成了地表水污染和全球变暖。这些问题可以通过浮动处理湿地(FTWs)来共同解决,浮动处理湿地在不占用土地空间的情况下处理湖泊、池塘、水库和雨水系统等水体。人工漂浮湿地是一种表流湿地,一般由支撑植物的漂浮平台组成,其根伸入水中。它们被设计用于处理各种废水,如雨水、污水、富营养化湖泊、溪流、工业废水和农业食品来源的三级废水。长纤维根直接或间接地通过促进根际微生物生物膜的生长来处理废水。通过改进设计,FTWs有可能加强水处理,增强对气候变化的适应能力,提供社区效益,并支持生物多样性。可以使用各种软件和分析方法来设计和预测系统的最佳处理效率。将生物膜载体、微生物燃料电池和微生物群落等技术整合到fts中是一个新兴的研究领域。虽然FTW可以降低污染物水平,但它面临着一些挑战,包括设置时间较长,处理有限或不均匀,对季节性变化的适应性有限,以及大规模使用时必须解决的可扩展性和维护问题。本文综述了FTW的设计标准、建模工具、处理机制、实际应用障碍、新兴创新和未来创新。
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引用次数: 0
Enhanced pollutant removal from real petrochemical wastewater by the combination of solar-powered electrocoagulation and plant-based coagulants: Optimization and mechanistic study 太阳能电混凝与植物基混凝剂联合强化石化废水污染物去除:优化与机理研究
Pub Date : 2026-03-01 Epub Date: 2026-02-03 DOI: 10.1016/j.clwat.2026.100217
Reyidan Abuduaini , Zhuo Chen , Ying-Lin He , Ghizlane Achagri , Jincheng Wu , Ümüt Halik , Rimeh Ismail , Peng-Cheng Ma , Abudukeremu Kadier
Petrochemical and petroleum extraction industries are discharging increasing amounts of oily wastewater, posing a serious threat to the ecological environment, water supplies, and human health. Therefore, developing efficient, green technologies for oily wastewater treatment is particularly urgent. Traditional wastewater treatment technologies have limitations in terms of efficiency and cost-effectiveness for treating oily wastewater with low chemical oxygen demand (COD). This study reports a novel hybrid system, combining solar-powered electrocoagulation (SPEC) with natural plant-based coagulants (PBCs), derived from Hami melon seeds, to treat petrochemical wastewater. Using the removal rates of COD, turbidity, color, and suspended solids as evaluation indicators, the effects of factors, including coagulant dosage, pH value, stirring speed, and stirring time, on the treatment efficiency were deeply explored through single-factor experiments. The experimental results show that under the optimized conditions of a coagulant dosage of 5 mg/L, a pH value of 2, a stirring speed of 150 rpm, and a stirring time of 30 min, the coagulation treatment achieves the highest efficiency. Furthermore, the efficiency of the combined SPEC-PBCs was investigated, and the response surface methodology was adopted to optimize the key operating parameters of the coupled system. With the help of the Box-Behnken experimental design and taking the COD removal rate as the response value, the effect of pH, dosage, and stirring speed on the treatment efficiency were systematically studied. The results show that under the optimal conditions of pH= 5, dosage= 3.2 mg/L, and stirring speed= 246 rpm, the COD removal rate is as high as 62.18 %. Moreover, the application of solar energy significantly reduced the dominant operational costs, thereby, enhancing the economic feasibility of the overall process. In conclusion, the obtained results proved that combining both technologies is a feasible approach that paves the way for green growth and ecological balance in treating oily wastewater.
石油化工和石油采掘行业含油废水排放量不断增加,对生态环境、供水和人体健康构成严重威胁。因此,开发高效、绿色的含油废水处理技术显得尤为迫切。传统的污水处理技术在处理低化学需氧量(COD)含油废水的效率和成本效益方面存在局限性。本研究报道了一种新型的混合系统,将太阳能电絮凝(SPEC)与从哈密瓜籽中提取的天然植物基絮凝剂(pbc)相结合,用于处理石化废水。以COD、浊度、色度、悬浮物去除率为评价指标,通过单因素实验,深入探讨混凝剂投加量、pH值、搅拌速度、搅拌时间等因素对处理效果的影响。实验结果表明,在混凝剂投加量为5 mg/L、pH值为2、搅拌速度为150 rpm、搅拌时间为30 min的优化条件下,混凝处理效率最高。在此基础上,研究了SPEC-PBCs组合的效率,并采用响应面法对耦合系统的关键工作参数进行了优化。采用Box-Behnken实验设计,以COD去除率为响应值,系统研究了pH、投加量、搅拌速度对处理效果的影响。结果表明,在pH= 5、投加量= 3.2 mg/L、搅拌速度= 246 rpm的最佳条件下,COD去除率高达62.18 %。此外,太阳能的应用大大降低了主要的运营成本,从而提高了整个过程的经济可行性。综上所述,两种技术相结合是一种可行的方法,为含油废水的绿色生长和生态平衡铺平了道路。
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引用次数: 0
Ecogenomic profiling of spatial variations in sediment microbial communities of a freshwater lake 某淡水湖沉积物微生物群落空间变化的生态基因组分析
Pub Date : 2026-03-01 Epub Date: 2026-01-31 DOI: 10.1016/j.clwat.2026.100214
Surya Balakrishnan , Bharathkumar Rajagopal , Abiraj Velusamy , Lathika Shanmugam , Boobal Rangaswamy
Freshwater lake sediments integrate physicochemical conditions and provide sensitive indicators of spatial variation in microbial community structure. This study investigated sediment bacterial communities from four sites in Singanallur Lake, Coimbatore, using 16S rRNA V3–V4 amplicon sequencing to characterize spatial heterogeneity in sediment microbial communities under uniform seasonal conditions. Across all samples, a total of 44 phyla, 114 classes, 257 orders, 466 families, and 1107 genera were detected, reflecting high taxonomic richness and spatial variability within the lake sediments. The community was dominated by Pseudomonadota, which ranged from 80.9 % in S1–51.8 % in S4, followed by Bacillota, Bacteroidota, and Cyanobacteriota. At the genus level, Caulobacter decreased from 30.6 % in S1–12.5 % in S4, along with notable genera such as Bosea and Phreatobacter. Alpha diversity increased steadily from S1 to S4, with observed OTUs ranging from 1722 to 13,796 and Shannon index values increasing from 5.14 to 8.44. Sequencing coverage ranged from 0.34 to 0.74, indicating incomplete sampling depth and representing a methodological limitation, while Gini coefficients (0.64–0.83) reflected uneven community structures, particularly in S1. Several low-abundance and site-enriched genera, including Akkermansia, Helicobacter, and Candidatus Saccharimonas, showed localized enrichment, indicating site-specific environmental conditions within the lake. Venn diagram analysis showed a core of five shared genera representing 31.3 % of total abundance, while rare and unique taxa exhibited minimal overlap (4.0 % and 3.8 %), highlighting strong spatial differentiation among sampling sites. Heatmap-based multivariate analysis integrating microbial OTU abundance with measured physicochemical water quality parameters and sediment heavy metal concentrations revealed clear associations between microbial assemblages and localized environmental gradients. These patterns indicate that sediment microbial communities respond sensitively to present-day physicochemical heterogeneity within the lake. This study provides a baseline spatial ecogenomic framework for Singanallur Lake and highlights the value of integrating microbial community profiling with water quality and metal measurements for future monitoring and comparative assessments.
淡水湖沉积物综合了理化条件,是微生物群落结构空间变化的敏感指标。本研究利用16S rRNA V3-V4扩增子测序技术,对哥印拜登Singanallur湖4个样点沉积物微生物群落进行了研究,分析了均匀季节条件下沉积物微生物群落的空间异质性。所有样本共检测到114纲257目466科1107属44门,反映了湖泊沉积物的分类丰富度和空间变异性。群落以假单胞菌属为主,s1为80.9 % ~ S4为51.8 %,其次为杆状菌属、拟杆菌属和蓝藻属。在属水平上,Caulobacter从s1的30.6 %下降到S4的12.5 %,Bosea和Phreatobacter等显著属也有所下降。从S1到S4, α多样性稳步增加,otu值在1722 ~ 13796之间,Shannon指数从5.14增加到8.44。测序覆盖范围为0.34 ~ 0.74,表明采样深度不完整,表明方法存在局限性,而基尼系数(0.64 ~ 0.83)反映了群落结构的不均匀,特别是S1。Akkermansia、Helicobacter和Candidatus Saccharimonas等几个低丰度和位点富集的属显示了局部富集,表明了湖泊内特定位点的环境条件。Venn图分析显示,5个共有属占总丰度的31.3 %,而稀有和独特分类群的重叠度最小(4.0 %和3.8 %),显示出强烈的空间分异。基于热图的多变量分析将微生物OTU丰度与测量的理化水质参数和沉积物重金属浓度相结合,揭示了微生物组合与局部环境梯度之间的明确关联。这些模式表明,沉积物微生物群落对当今湖泊内的物理化学异质性反应敏感。该研究为Singanallur湖提供了一个基本的空间生态基因组框架,并强调了将微生物群落分析与水质和金属测量相结合对未来监测和比较评估的价值。
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引用次数: 0
From wells to well-being 从井到幸福
Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.clwat.2025.100195
Haojie Xu , Qiman Liu
Access to safe drinking water remains a persistent global challenge. This short communication presents a historical analysis of safe water well practices in China, spanning from the Song Dynasty (960–1279 AD) to the modern era. By examining visual documentation, including the painting Along the River During the Qingming Festival and records from the 1930s ‘Dingxian Model’ public health intervention, we identify a recurring, effective feature: the construction of raised well edges to prevent surface contamination. This case study demonstrates that historical practices can offer valuable, low-cost insights for sustainable water management and safety, highlighting the importance of learning from past socio-technical adaptations to address contemporary water security issues.
获得安全饮用水仍然是一项持久的全球挑战。这篇简短的文章介绍了中国从宋朝(公元960-1279年)到现代的安全水井实践的历史分析。通过考察视觉文献,包括《清明上河图》和20世纪30年代“定县模式”公共卫生干预的记录,我们发现了一个反复出现的有效特征:建造凸起的井边以防止表面污染。本案例研究表明,历史实践可以为可持续水管理和安全提供有价值的、低成本的见解,强调了从过去的社会技术适应中学习以解决当代水安全问题的重要性。
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引用次数: 0
Optimization of Fe3O4/TiO2-based biopolymer nanocomposite for heavy metal removal from aqueous solution using artificial neural network modelling and response surface methodology 基于人工神经网络建模和响应面法优化Fe3O4/ tio2基生物聚合物纳米复合材料去除水中重金属
Pub Date : 2026-03-01 Epub Date: 2026-02-11 DOI: 10.1016/j.clwat.2026.100221
Koffi Sossou , Alfred O. Mayabi , Negusse Zeraebruk Kahsay , Charles K. Cheruiyot
This study applied Response Surface Methodology (RSM) and Artificial Neural Network (ANN) modeling to optimize and predict the removal efficiencies of chromium (VI), cadmium (II), and lead (II) ions from aqueous solutions using a Fe3O4/TiO2 banana peel biopolymer nanocomposite. Batch adsorption experiments were conducted using a fixed solution volume of 100 mL and designed according to a Box–Behnken experimental design to investigate the effects of pH, initial metal ion concentration, adsorbent dosage, and contact time. The RSM quadratic model for Cr(VI) (F = 5.91, p = 0.0010; R2 = 0.86) and the linear models for Cd(II) (F = 6.70, p = 0.0005; R² = 0.87) and Pb(II) (F = 2.95, p = 0.0406; R2 = 0.33) were statistically significant, identifying the dominant factors influencing adsorption efficiency. Optimization using the desirability function predicted maximum removal efficiencies of 95.95 % for Cr(VI) at pH 8.4, initial concentration 47.30 mg/L, adsorbent dosage 16.7 g/L, and contact time 56.77 min; and complete removal (100 %) for Cd(II) and Pb(II) at pH 6.5, initial concentration 30 mg/L, adsorbent dosage 15 g/L, and contact time 65 min. The ANN models demonstrated superior predictive performance compared to RSM, with high coefficients of determination (R2 = 0.97, 0.98, and 0.95 for Cr(VI), Cd(II), and Pb(II), respectively) and low prediction errors (RMSE = 0.464–8.88; MAE = 0.375–5.45), effectively capturing nonlinear interactions among process variables. The Fe3O4/TiO2/banana peel nanocomposite exhibited high adsorption efficiency, magnetic recoverability, and strong potential for simultaneous multi-metal removal, while a hybrid RSM–ANN modeling framework provided robust process optimization and accurate predictive capability.
本研究采用响应面法(RSM)和人工神经网络(ANN)建模来优化和预测Fe3O4/TiO2香蕉皮生物聚合物纳米复合材料对水溶液中铬(VI)、镉(II)和铅(II)离子的去除效率。采用Box-Behnken实验设计,采用固定溶液体积100 mL进行批量吸附实验,考察pH、初始金属离子浓度、吸附剂用量、接触时间等因素对吸附效果的影响。对Cr(VI) (F = 5.91, p = 0.0010,R2 = 0.86)和Cd(II) (F = 6.70, p = 0.0005,R²= 0.87)和Pb(II) (F = 2.95, p = 0.0406,R2 = 0.33)的二次曲线模型均具有统计学意义,表明影响吸附效率的主要因素。优选结果表明,在pH 8.4、初始浓度47.30 mg/L、吸附剂用量16.7 g/L、接触时间56.77 min条件下,Cr(VI)的最大去除率为95.95 %;在pH为6.5、初始浓度为30 mg/L、吸附剂投加量为15 g/L、接触时间为65 min的条件下,对Cd(II)和Pb(II)的去除率为100 %。与RSM模型相比,人工神经网络模型具有较高的预测系数(Cr(VI), Cd(II)和Pb(II)分别为R2 = 0.97, 0.98和0.95)和较低的预测误差(RMSE = 0.464-8.88; MAE = 0.375-5.45),有效地捕获了过程变量之间的非线性相互作用。Fe3O4/TiO2/香蕉皮纳米复合材料具有较高的吸附效率、磁性可恢复性和同时去除多种金属的强大潜力,而混合RSM-ANN建模框架提供了稳健的工艺优化和准确的预测能力。
{"title":"Optimization of Fe3O4/TiO2-based biopolymer nanocomposite for heavy metal removal from aqueous solution using artificial neural network modelling and response surface methodology","authors":"Koffi Sossou ,&nbsp;Alfred O. Mayabi ,&nbsp;Negusse Zeraebruk Kahsay ,&nbsp;Charles K. Cheruiyot","doi":"10.1016/j.clwat.2026.100221","DOIUrl":"10.1016/j.clwat.2026.100221","url":null,"abstract":"<div><div>This study applied Response Surface Methodology (RSM) and Artificial Neural Network (ANN) modeling to optimize and predict the removal efficiencies of chromium (VI), cadmium (II), and lead (II) ions from aqueous solutions using a Fe<sub>3</sub>O<sub>4/</sub>TiO<sub>2</sub> banana peel biopolymer nanocomposite. Batch adsorption experiments were conducted using a fixed solution volume of 100 mL and designed according to a Box–Behnken experimental design to investigate the effects of pH, initial metal ion concentration, adsorbent dosage, and contact time. The RSM quadratic model for Cr(VI) (F = 5.91, p = 0.0010; R<sup>2</sup> = 0.86) and the linear models for Cd(II) (F = 6.70, p = 0.0005; R² = 0.87) and Pb(II) (F = 2.95, p = 0.0406; R<sup>2</sup> = 0.33) were statistically significant, identifying the dominant factors influencing adsorption efficiency. Optimization using the desirability function predicted maximum removal efficiencies of 95.95 % for Cr(VI) at pH 8.4, initial concentration 47.30 mg/L, adsorbent dosage 16.7 g/L, and contact time 56.77 min; and complete removal (100 %) for Cd(II) and Pb(II) at pH 6.5, initial concentration 30 mg/L, adsorbent dosage 15 g/L, and contact time 65 min. The ANN models demonstrated superior predictive performance compared to RSM, with high coefficients of determination (R<sup>2</sup> = 0.97, 0.98, and 0.95 for Cr(VI), Cd(II), and Pb(II), respectively) and low prediction errors (RMSE = 0.464–8.88; MAE = 0.375–5.45), effectively capturing nonlinear interactions among process variables. The Fe<sub>3</sub>O<sub>4/</sub>TiO<sub>2</sub>/banana peel nanocomposite exhibited high adsorption efficiency, magnetic recoverability, and strong potential for simultaneous multi-metal removal, while a hybrid RSM–ANN modeling framework provided robust process optimization and accurate predictive capability.</div></div>","PeriodicalId":100257,"journal":{"name":"Cleaner Water","volume":"5 ","pages":"Article 100221"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microbial detoxification of heavy metals in wastewater: Mechanisms, current perspectives and emerging bioremediation strategies 废水中重金属的微生物解毒:机制,目前的观点和新兴的生物修复策略
Pub Date : 2026-03-01 Epub Date: 2026-02-02 DOI: 10.1016/j.clwat.2026.100216
Varsha Bisht , Shruti Singh , Veeranna Channashettar , Nanthakumar Kuppanan , Banwari Lal
The rapid expansion of industrial activities and their consequent discharge into the environment is causing severe threats to ecosystems and public health. Toxic heavy metals such as cadmium, arsenic, copper, chromium, lead, cobalt, and others are of particular concern. It has become a long-term challenge to treat such wastes polluted with these persisting contaminants. They bioaccumulate in food chains and therefore possess harmful effects. Microorganisms serve as effective biological tools for heavy metal removal and detoxification from water and wastewater. The role of microbes in biotransformation of heavy metals into lesser toxic forms has been explored in this review. Bacterial-mediated mechanisms such as biosorption, bioleaching, bioaccumulation, bioprecipitation, and biotransformation involved in the detoxification of heavy metals have been discussed. Biotechnological implication of metal-contaminated waste has been highlighted with reference to use of bioreactor technology, nanobiotechnology, genomics, heavy metal-accumulating plants, and mechanism of metal removal and tolerance in microbes. Understanding these processes further contributes to the development of approaches which are effective yet sustainable in remediating wastewaters contaminated with heavy metals.
工业活动的迅速扩大及其排放到环境中,对生态系统和公众健康造成严重威胁。有毒的重金属,如镉、砷、铜、铬、铅、钴等,尤其值得关注。如何处理这些被持久性污染物污染的废物已成为一项长期挑战。它们在食物链中生物积累,因此具有有害影响。微生物是水和废水中重金属去除和解毒的有效生物工具。本文综述了微生物在重金属转化为毒性较小的形式中的作用。细菌介导的机制,如生物吸附,生物淋滤,生物积累,生物沉淀和生物转化参与重金属的解毒进行了讨论。从生物反应器技术、纳米生物技术、基因组学、重金属富集植物、微生物对金属的去除和耐受机制等方面阐述了金属污染废物的生物技术意义。了解这些过程进一步有助于制定有效而可持续的方法来修复被重金属污染的废水。
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引用次数: 0
Nanotechnological solutions for endocrine disrupting compounds in water: From advanced detection to sustainable remediation – A review 纳米技术解决水中内分泌干扰物:从先进检测到可持续修复综述
Pub Date : 2026-03-01 Epub Date: 2026-01-08 DOI: 10.1016/j.clwat.2026.100206
N.A.P.M. Nishshanka , Thilini Jayasinghe , U.S. Liyanarachchi , W.A.M. Weerasinghe , Harshi Jayasingha , Gayan Amarasooriya
Endocrine-disrupting compounds (EDCs) pose a significant threat to global water security due to their environmental persistence, bioaccumulation, and potent biological activity at low concentrations. Conventional water treatment is often ineffective, necessitating advanced remediation strategies. This comprehensive review examines the transformative potential of nanotechnology for EDC mitigation, highlighting its application in detection, adsorption, and degradation. Nano-enabled approaches demonstrate remarkable efficiencies, including > 99.9 % rejection by graphene oxide membranes, > 95 % photocatalytic degradation within 60 min using N-doped TiO2, and adsorption capacities exceeding 480 mg/g for functionalized metal-organic frameworks. However, challenges regarding nanomaterial environmental fate, economic viability, and scalability remain. The review underscores the need for green synthesis and thorough toxicity assessments. Future directions point to the integration of multi-functional nanocomposites and AI-guided material design as a promising path toward sustainable and intelligent water treatment solutions.
内分泌干扰化合物(EDCs)由于其环境持久性、生物蓄积性和低浓度下的强生物活性,对全球水安全构成了重大威胁。传统的水处理往往是无效的,需要先进的补救策略。这篇综合综述探讨了纳米技术在减缓EDC方面的变革潜力,重点介绍了其在检测、吸附和降解方面的应用。纳米化方法显示出显著的效率,包括氧化石墨烯膜的去除率>; 99.9 %,n掺杂TiO2在60 min内的光催化降解>; 95 %,以及功能化金属有机框架的吸附容量超过480 mg/g。然而,关于纳米材料的环境命运、经济可行性和可扩展性的挑战仍然存在。该综述强调了绿色合成和全面毒性评估的必要性。未来的发展方向是多功能纳米复合材料和人工智能指导材料设计的结合,这是一条通往可持续和智能水处理解决方案的有前途的道路。
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引用次数: 0
Nature-based wastewater treatment technologies: A comprehensive review of constructed wetlands and vermifiltration 基于自然的污水处理技术:人工湿地和渗滤的综合综述
Pub Date : 2026-03-01 Epub Date: 2026-01-07 DOI: 10.1016/j.clwat.2026.100204
Amanpreet Kaur , Sudipti Arora , Ajendra Kumar , Arun Karnwal , Rattandeep Singh
Water scarcity and inefficient wastewater management are critical global challenges. Nature-based solutions (NBS) such as Constructed Wetlands (CWs) and Vermifiltration (VF) have emerged as sustainable, decentralized approaches for wastewater treatment. This systematic review (PRISMA-guided) synthesizes recent evidence on CW and VF performance across multiple wastewater types (domestic, greywater, hospital, dairy, agricultural, and textile). Findings reveal that CWs consistently outperform in nutrient (TP, NH4 +-N) and chemical pollutant removal, while VFs excel in TSS removal, rapid stabilization, and pathogen reduction. Importantly, this review highlights knowledge gaps in large-scale implementation and head-to-head trials. The innovative contribution of this work lies in proposing an integrated hybrid CW-VF framework, wherein VF units provide initial solid and organic load reduction, followed by CWs for nutrient polishing and advanced contaminant removal. This hybrid pathway can optimize land use, enhance efficiency, and improve resilience under varying wastewater profiles. Positioned within the global push for SDG 6 (Clean Water & Sanitation), this review provides both a synthesis of current research and a forward-looking strategy for advancing decentralized, eco-friendly wastewater management.
水资源短缺和废水管理效率低下是重大的全球挑战。基于自然的解决方案(NBS),如人工湿地(CWs)和蠕虫过滤(VF),已经成为可持续的、分散的污水处理方法。本系统综述(prisma引导)综合了多种废水类型(家庭、污水、医院、乳制品、农业和纺织)中连续水和VF性能的最新证据。研究结果表明,CWs在去除营养物质(TP、NH4 +-N)和化学污染物方面一直表现优异,而VFs在去除TSS、快速稳定和减少病原体方面表现优异。重要的是,本综述强调了大规模实施和面对面试验方面的知识差距。这项工作的创新贡献在于提出了一个集成的混合CW-VF框架,其中VF单元提供初始的固体和有机负荷减少,然后是cw用于营养物质抛光和高级污染物去除。这种混合路径可以优化土地利用,提高效率,并改善不同废水剖面下的恢复能力。在全球推动可持续发展目标6(清洁水和卫生设施)的背景下,本综述对当前研究进行了综合,并为推进分散、环保的废水管理提供了前瞻性战略。
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引用次数: 0
A critical review of low-cost biosorbents derived from animal dung for effective adsorption of dye pollutants 从动物粪便中提取的低成本生物吸附剂对染料污染物的有效吸附
Pub Date : 2026-03-01 Epub Date: 2025-12-13 DOI: 10.1016/j.clwat.2025.100191
Stephen Sunday Emmanuel , Odunayo T. Ore , Ajibola A. Bayode , Hamza Badamasi , Saheed O. Sanni , Obianuju Patience Ilo , Ademidun Adeola Adesibikan , Mustapha Omenesa Idris
Valorization of biomass waste into adsorbents that can remove pollutants remains one of the key synergetic strategies to promote environmental sustainability. This study aimed to review the adsorptive removal of dyes from aqueous media using animal dung-based biosorbents (ADBBs) as a low-cost material. Notably, findings from this study showed that modified animal dung-based biochar and activated carbon were the most effective ADBB classes for dye removal. Specifically, the highest adsorption capacity (qm = 1241 mg/g) was recorded for rhodamine B using activated cow-dung biochar. Also, findings revealed that H-bonding, electrostatic interactions, and π–π interactions are the main mechanisms of dye uptake by the ADBBs. Furthermore, in most studies, dye adsorption followed the Langmuir isotherm and pseudo-second-order kinetics, indicating monolayer adsorption governed by pore availability on the ADBBs surface. This study also established that ADBBs have good reusability potential, with over 70 % of the original efficiency maintained after 3–10 cycles. The implications of these findings highlight that ADBBs provide a sustainable and cost-effective route for wastewater treatment while simultaneously promoting the waste-to-wealth initiative. Additionally, the demonstrated efficiency and reusability suggest ADBBs' suitability for industrial-scale applications.
将生物质废物转化为可以去除污染物的吸附剂仍然是促进环境可持续性的关键协同战略之一。本研究旨在综述利用动物粪便基生物吸附剂(ADBBs)作为一种低成本材料吸附去除水中染料的研究进展。值得注意的是,本研究结果表明,改性动物粪便基生物炭和活性炭是去除染料最有效的ADBB类别。其中,活性牛粪生物炭对罗丹明B的吸附量最高,qm = 1241 mg/g。研究结果还表明,氢键、静电相互作用和π -π相互作用是ADBBs吸附染料的主要机制。此外,在大多数研究中,染料吸附遵循Langmuir等温线和拟二级动力学,表明ADBBs表面的单层吸附受孔隙可用性控制。本研究还确定了ADBBs具有良好的重复利用潜力,在3-10次循环后,其效率保持在70%以上 %。这些发现的意义突出表明,adbs为废水处理提供了可持续和具有成本效益的途径,同时促进了废物转化为财富的倡议。此外,演示的效率和可重用性表明adbb适合工业规模的应用。
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引用次数: 0
A comparative analysis of defatted pumpkin seed extract and conventional coagulants for sustainable turbidity reduction in water and wastewater treatment 脱脂南瓜籽提取物和常规混凝剂在水和废水处理中可持续降低浊度的比较分析
Pub Date : 2025-12-01 Epub Date: 2025-08-22 DOI: 10.1016/j.clwat.2025.100114
Amal Al-Hanaktah , Rahma Adel Al-Rafayia , Ala' Haitham AL-Ghbabsheh , Aiman Eid Al-Rawajfeh , Bandita Mainali , Muhammad Kashif Shahid
Utilizing novel coagulants as a pretreatment is essential before purification processes like RO membranes, as it helps reduce turbidity from clogging particles. There is an increasing demand for effective plant-based coagulants, and defatted pumpkin seed extract offers a cost-effective alternative to traditional synthetic coagulants. Coagulation experiments were conducted to assess the effectiveness of defatted pumpkin seed extract and identify optimal treatment conditions. Results from synthetic turbid water samples indicated optimal performance at a dosage of 5.5 v/v%, pH 7.38, and a slow mixing time of 10 min, achieving an impressive turbidity removal efficiency of 96.87 %. Conversely, the highest turbidity removal efficiency for industrial wastewater was observed at a dose of 1.5 v/v% and pH 6.05, achieving a removal efficiency of 79.4 %. All statistical estimators indicate that the developed models are statistically validated for simulating the coagulation process. Furthermore, a comparative analysis with Alum, PVA, and chitin was undertaken to assess the effectiveness of pumpkin seeds in reducing turbidity. The outcomes demonstrated that Alum achieved a removal percentage of 98.76 % at 4 v/v%, while combining it with pumpkin seed extract resulted in 98.68 % removal at 3 v/v%. Similarly, PVA showed 94.18 % removal at 1 v/v%, increasing to 97.44 % with pumpkin seeds at 6 v/v%. Additionally, Chitin removed 97.35 % of turbidity at 4 v/v%, with a slight increase to 97.66 % when combined with pumpkin seeds at the same dose. This study characterized the pumpkin seed, highlighting the active content responsible for coagulation. In addition, the estimated treatment cost suggests that pumpkin seed is cost-effective. These findings highlight the effectiveness of defatted pumpkin seed extract as a potential substitute for traditional coagulants in water treatment processes.
在RO膜等净化过程之前,使用新型混凝剂作为预处理是必不可少的,因为它有助于减少堵塞颗粒的浊度。对有效的植物基混凝剂的需求不断增加,脱脂南瓜籽提取物为传统的合成混凝剂提供了一种具有成本效益的替代品。通过凝血实验对脱脂南瓜籽提取物的效果进行了评价,并确定了最佳处理条件。合成混浊水样品的结果表明,当投加量为5.5 v/v%, pH值为7.38,缓慢混合时间为10 min时,效果最佳,浊度去除率为96.87 %。相反,在浓度为1.5 v/v%、pH为6.05时,工业废水的浊度去除率最高,达到79.4% %。所有的统计估计都表明,所建立的模型在统计上是有效的,可以模拟混凝过程。此外,还与明矾、聚乙烯醇和几丁质进行了对比分析,以评估南瓜籽降低浊度的有效性。结果表明,明矾在4 v/v%时去除率为98.76 %,与南瓜籽提取物在3 v/v%时去除率为98.68 %。同样,在1 v/v%时,PVA的去除率为94.18 %,在6 v/v%时,PVA的去除率为97.44 %。在4 v/v%的浓度下,甲壳素去除97.35 %的浊度,当与南瓜籽混合使用时,其浊度略有增加,达到97.66 %。本研究对南瓜籽进行了表征,突出了负责凝血的活性成分。此外,估计的处理费用表明南瓜籽具有成本效益。这些发现突出了脱脂南瓜籽提取物在水处理过程中作为传统混凝剂的潜在替代品的有效性。
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Cleaner Water
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