{"title":"SO3H covered nanofiltration composite membrane by taurine for selective removal of anionic solutes","authors":"Dongqing Liu, Xu Tian","doi":"10.2166/ws.2025.041","DOIUrl":"https://doi.org/10.2166/ws.2025.041","url":null,"abstract":"ABSTRACT Nanofiltration (NF) membranes have already been widely used owing to the merits of high permeability, energy saving, and selective separation. Here, a convenient way to prepare a functional layer of a composite NF membrane was investigated, which used taurine to replace a part of piperazine (PIP) in the aqueous phase in interfacial polymerization to decrease the cross-linking density of the polyamide network. Although the molecular weight cutoff by the membrane decreased to 2,000 Da, the interception to sulfates and negatively charged dyes was strengthened. As the taurine ratio increased, the surface layer thinned, and pure water permeation improved, but MgSO4 rejection showed a tendency of ‘first-increase-then-decrease’ under the synergism of size exclusion and the Donnan effect. At the apex ratio of 4:1 (taurine: PIP), the T80 membrane showed >98% retention to sulfates, MgSO4, Na2SO4, and (NH4)2SO4, and >98.7% rejection to anionic dyes, methyl blue, congo red, and acid chrome blue K (ABK). The film also exhibited excellent fouling resistance to emulsified oil, humic acid, and bovine serum albumin, and fractionation of ABK and NaCl.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"25 4","pages":"684-695"},"PeriodicalIF":0.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iwaponline.com/ws/article-pdf/doi/10.2166/ws.2025.041/1558825/ws2025041.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147908784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Upcycling of steel slag to activate persulfate for the degradation of chlortetracycline hydrochloride: Performance and mechanism","authors":"Jinyu Shi, Xiong Lan, Cuirong Yan, Xintao Zhou, Zhongqiu Luo, Shimin Zhao, Zhijun He","doi":"10.2166/wst.2024.358","DOIUrl":"https://doi.org/10.2166/wst.2024.358","url":null,"abstract":"ABSTRACT Steel slag has great potential as an Fe-based heterogeneous Fenton-like catalyst because of its high iron content and low cost. However, the iron compounds are often encapsulated by calcium or silicon compounds in the steel slag. Herein, steel slag powder was acid-modified with salicylic acid to remove some Ca–Si compounds and thus expose more iron active sites. The results showed that the calcium content significantly decreased from 36.33 to 20.54% after modification, and more transition metals of Fe and Mn with catalytic activities were exposed simultaneously. During the activation of peroxysulphate, the conversion of Fe(Ⅱ) to Fe(Ⅲ) occurs and large amounts of •OH and 1O2 are produced as the main reactive oxygen species. The removal rates of CTC and TOC are 93.42 and 46.05%, respectively, and a degradation process may also be inhibited by CO32−, H2PO4−, and humic acid (HA). The degradation pathways of CTC mainly include both dechlorination and demethylation. In addition, salicylic acid-modified steel slag shows good repeated usability, and its removal ability is maintained at higher than 80% after four times of recycling. This study provides a new idea for designing an efficient and cheap catalyst to treat organic wastewater.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"90 9","pages":"2660-2672"},"PeriodicalIF":0.0,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iwaponline.com/wst/article-pdf/90/9/2660/1506469/wst2024358.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147897931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experimental study on the treatment of high COD metal degreasing cleaning wastewater by coagulation and two-stage Fenton oxidation","authors":"Shengshu Ai, Siwen Yang, Xuejian Sun, Fan Wang, Ying Zhang, Haigang Zhang, Dejun Bian","doi":"10.2166/wst.2024.350","DOIUrl":"https://doi.org/10.2166/wst.2024.350","url":null,"abstract":"ABSTRACT In this study, based on the water quality characteristics of metal degreasing cleaning wastewater , wastewater treatment by coagulation combined with two-stage Fenton oxidation was proposed. The results showed that when the dosage of PAC was 5 g/L and the dosage of CPAM was 8 mg/L, with an initial pH of 8, rapid stirring at 350 rpm for 3 min followed by slow stirring at 200 rpm for 15 min, the optimal removal rate of chemical oxygen demand (COD) reached 74.08%. Primary Fenton oxidation is mainly aimed at decomposing macromolecular long-chain pollutants and removing some pollutants. The highest COD removal rate was achieved at 95.07% when the dosage of H2O2 was 4 mol/L, the dosage of FeSO4 was 40 g/L, the oxidation lasted for 60 min, the initial pH was 2, the effluent pH was 8, and the settling time was 90 min. The two-stage Fenton oxidation process provided further advanced treatment. With a reagent ratio of 1:0.5, the effluent COD concentration was reduced to 457 mg/L, meeting the third class standard of the `Integrated Wastewater Discharge Standard' (GB 8978 1996).","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"90 9","pages":"2572-2584"},"PeriodicalIF":0.0,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iwaponline.com/wst/article-pdf/doi/10.2166/wst.2024.350/1496851/wst2024350.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147913816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Conversion of waste paper sludge into magnetic biochar for activation of peroxydisulfate for tetracycline removal","authors":"Xin Zhang, Hongtao Zhang, Shuhan Cai, Zehong Hu","doi":"10.2166/wst.2024.339","DOIUrl":"https://doi.org/10.2166/wst.2024.339","url":null,"abstract":"ABSTRACT The Fe2+-peroxydisulfate (PDS) process is an effective method to enhance paper sludge dewaterability. However, the generated waste of iron-rich sludge cake needs to be disposed of properly. Converting sludge cake into magnetic biochar catalysts can help to shorten its environmental risks, recover resources, and reduce catalyst costs. In this work, the magnetic sludge biochar (Fe-SBC) was prepared and applied as a PDS activator to remove tetracycline (TC). Results showed that the Fe-SBC pyrolyzed at 600 °C presented excellent catalytic activity for PDS to degrade TC (rate of 74.89%) under the optimum conditions (intrinsic pH, 10 mM PDS, 0.5 g/L Fe-SBC, and 50 mg/L TC). It was found for the first time that the addition sequences of the biochar catalyst and PDS were insignificant on TC removal. Furthermore, the TC removal mechanism was proposed to be free radicals (·OH, SO4·−, and O2−·) and non-radical (1O2) pathways working together for TC removal, for which 1O2 was dominated. In addition, coexisting ions (Cl− and CO32−) had an inhibitory effect on TC degradation. This work will provide a new recycling approach for waste paper sludge in wastewater treatment.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"90 8","pages":"2327-2339"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iwaponline.com/wst/article-pdf/doi/10.2166/wst.2024.339/1492973/wst2024339.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147894753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Assistance of aminated straw on enhanced biodegradation of phenol through bacteria and potential prediction of machine learning for bioremediation","authors":"Lei Yu, Shuxin Gong, Jing Liang","doi":"10.2166/wst.2024.323","DOIUrl":"https://doi.org/10.2166/wst.2024.323","url":null,"abstract":"ABSTRACT How to treat phenol-containing wastewater harmlessly is an urgent problem to be solved. In this study, a kind of biomaterial was prepared through strain PAO1 immobilized on aminated straw to enhance the phenol removal rate and efficiency. The aminated straw assisted PAO1 to increase the phenol degraded concentration from 1,900 to 1,500 mg/L, and shorten the degraded time by 44 h at 1,500 mg/L phenol. The immobilized PAO1 could remove phenol at pH 10 and 11, which was 2.7 and 3.8 times higher than free bacteria, respectively. In addition, the immobilized PAO1 could totally remove phenol, which was twice as high as that of free bacteria, at 4% NaCl stress. Furthermore, the removal efficiency of immobilized PAO1 was higher than that of free bacteria under the stress of various metal ions, especially for Co2+ and Pb2+. The determination coefficients R2 and root mean square error showed that the back propagation artificial neural network model could predict the degradation of phenol under various conditions, saving time and economic cost. The present study envisions that this biomaterial has great potential in the bioremediation of organic pollutions.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"90 7","pages":"2174-2185"},"PeriodicalIF":0.0,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iwaponline.com/wst/article-pdf/90/7/2174/1495627/wst2024323.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147877437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Enhanced removal of antibiotic-resistant genes by sodium persulfate catalyzed by nanoscale zero-valent iron modified by <i>Ginkgo biloba</i> L. leaf","authors":"Wanjun Duan, Haijun Cao","doi":"10.2166/wst.2024.299","DOIUrl":"https://doi.org/10.2166/wst.2024.299","url":null,"abstract":"ABSTRACT In this study, nanoscale zero-valent iron (nZVI) modified by Ginkgo biloba L. leaf (G-nZVI), as an effective catalyst, exhibited excellent activation of sodium persulfate (PS), which could achieve higher removal efficiency of antibiotic-resistant genes (ARGs) in the Fen River than PS + nZVI system. This study utilizes forestry waste to address the limitations of using Fe2+/nZVI as an activator for the removal of ARGs. This approach adheres to the principle of employing waste to treat waste. The technology converts G. biloba L. leaf into plant extracts that are rich in a variety of bioactive components, rather than purifying natural biomolecules, which decreases operational complexity. In addition, the G-nZVI + PS system demonstrates superior removal performance to single components in the system. Consequently, the mechanism underlying the G-nZVI + PS treatment is attributed to peroxidation induced by radicals. In this context, the results of ARG removal by G-nZVI + PS with different G. biloba L. leaf /FeSO4·7H2O volume ratios indicated that the G. biloba L. leaf enhanced the conversion of Fe3+ to Fe2+, thereby generating more radicals through electron transfer between the biomass and G-nZVI. This research underscores the advantages of modifying G. biloba L. leaf for improved catalytic efficiency and the role of the components within the system.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"90 5","pages":"1706-1716"},"PeriodicalIF":0.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iwaponline.com/wst/article-pdf/90/5/1706/1478845/wst2024299.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147920469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. D. Champaneri, Ketan D. Desai, V. P. Sharma, Dnyaneshwar Arjun Madane, Sanket J. More
{"title":"A synoptic review of deficit irrigation methods: sustainable water-saving strategies in vegetable cultivation","authors":"D. D. Champaneri, Ketan D. Desai, V. P. Sharma, Dnyaneshwar Arjun Madane, Sanket J. More","doi":"10.2166/ws.2024.195","DOIUrl":"https://doi.org/10.2166/ws.2024.195","url":null,"abstract":"ABSTRACT It is elusive and highly challenging to sustain the productivity of vegetable commodities under limited available natural resources and anticipated future climatic scenarios. Amongst available natural resources, water remains the most limiting factor. Present vegetable cultivation practices involve the utilization of excessive quantities of water, thereby leading to the wastage of precious water resources. Therefore, sustainable management of irrigation water is crucial for future vegetable cultivation, as most vegetable crops are vulnerable to water scarcity at different growth stages, which can result in yield and post-harvest quality losses. Adoption of deficit irrigation (DI) is one of the sustainable irrigation water management approaches. DI is a sustainable water-saving approach, as irrigation water is applied in limited or lower quantities than the actual evapotranspiration-based crop water requirement. Strategic application of water at the right time and quantity with the right technique can greatly improve water use efficiency and water productivity. It could also enhance the post-harvest quality with marginal yield loss. Yield losses whatsoever could be compensated by expanding agricultural areas in water-scarce zones by adopting the DI strategy. This review discusses the concept and types of DI and examines its implications for the morpho-physiology and productivity of commercially important vegetable crops.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"24 9","pages":"3132-3147"},"PeriodicalIF":0.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://iwaponline.com/ws/article-pdf/doi/10.2166/ws.2024.195/1468150/ws2024195.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147877502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cuimin Feng, Sairui Guan, JiYue Jin, Renda Yao, Ziwei Wang, Haoxiang Li
{"title":"Disinfection performance and synthesis conditions of the EGCG–Cu complex","authors":"Cuimin Feng, Sairui Guan, JiYue Jin, Renda Yao, Ziwei Wang, Haoxiang Li","doi":"10.2166/ws.2023.302","DOIUrl":"https://doi.org/10.2166/ws.2023.302","url":null,"abstract":"Abstract Adopting the yield of the epicatechin gallate (EGCG)–Cu complex as an indicator, the impact of four conditions, such as pH, reaction time, temperature and reactant ratio, on the synthesis of the target complex was analyzed to identify the optimal conditions on synthesizing the compound. The reactant ratio between EGCG and Cu2+ was explored, and the characteristic peaks and functional groups of the EGCG–Cu complex were scrutinized by UV–Visible and Fourier-Transform Infrared spectrophotometers. Finally, the efficacy difference of bactericidal properties against Escherichia coli suspensions between EGCG and its complex was evaluated as the criteria. Furthermore, comparative studies were performed to gauge the antimicrobial activity of EGCG and its complex at equivalent concentrations. The results demonstrated that the optimal experimental conditions for the complex reaction were a pH of 7, at 40 °C, in a reaction time of 60 min and a reactant ratio of 1:2. By the molar ratio method, the reactant ratio was determined as n(EGCG):n(Cu2+) = 1:2, and the complex reaction was at the phenolic hydroxyl group on the benzene ring of EGCG. Compared to EGCG, the complex demonstrated significant enhancement in bactericidal properties against E. coli. Complexing enhances its antibacterial properties and the complex solution has lower chromaticity than EGCG during disinfection.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"37 39","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134954613","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}
{"title":"Developing an optimal plan to improve irrigation efficiency using a risk-based central force algorithm","authors":"Juming Jiang, Shi Chen","doi":"10.2166/ws.2023.303","DOIUrl":"https://doi.org/10.2166/ws.2023.303","url":null,"abstract":"Abstract Losses in surface irrigation include deep percolation and runoff, which is one of the ways to increase the efficiency of furrow irrigation, using a closed-end mode in irrigation systems. This research was conducted to evaluate the effects of geometrical variables (slope and length of furrow) and flow control (inflow rate and cut-off time) on application efficiency (AE) and the uniformity of water distribution in a closed-end furrow irrigation system. The length, slope, inflow rate, and cut-off time are considered as the decision-making variables for developing the multi-objective genetic algorithm based on the non-dominated sorting. For this purpose, three irrigation furrows with the closed-end system were considered. The optimization algorithm for calculating the objective functions involves maximizing the minimum water depth and minimizing the infiltration depth in a modeling loop. The optimization algorithm was linked to the WinSRFR software to calculate the objective functions. The results showed that the best combination of inflow rate and the cut-off time for 75 mm of required water depth was 1.9 l/s/m and 150 min, respectively, which increased AE and distribution uniformity to 79 and 78%. Furthermore, the AE in the closed-end furrow irrigation system is higher (30–50%) than the open-end method in different scenarios.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"36 30","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134954083","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}
{"title":"Selection of Real-Coded Genetic Algorithm parameters in solving simulation–optimization problems for the design of water distribution networks","authors":"Vidavaluru Hemanth Sai Kumar, Pramada S.K.","doi":"10.2166/ws.2023.301","DOIUrl":"https://doi.org/10.2166/ws.2023.301","url":null,"abstract":"Abstract The design of the water distribution network (WDN) is very difficult mainly due to the nonlinear relation between head and flow. The distribution network should also be cost-effective. In any simulation–optimization approach, the computational time requirement is very high for very complex problems. The optimization module plays a crucial role in reducing the computational time. This study aims to apply a simulation–optimization approach to designing a WDN. EPANET is selected as the simulation model and Real-Coded Genetic Algorithm (RCGA) is selected as the optimization module. To link the simulation module with the optimization module, a program is written in MATLAB. The developed simulation–optimization approach was applied to two benchmark network problems to check the suitability of the method. The parameters of the RCGA were optimized for the two networks. The computational efficiency of the developed simulation–optimization model is checked based on the number of function evaluations. For both networks, the number of function evaluations to get the optimum network design was less than the number of function evaluations required for other methods mentioned in the literature.","PeriodicalId":23573,"journal":{"name":"Water Science & Technology: Water Supply","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957772","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}