{"title":"Optimizations for tunnel drainage water system based on locations of crystallizations","authors":"Zhuanghong Lin, Kuangda Liu, Xuefu Zhang, Xiangge Chen, Peng Xie, Yong Tan","doi":"10.5004/dwt.2023.29681","DOIUrl":"https://doi.org/10.5004/dwt.2023.29681","url":null,"abstract":".","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Muhammad Vohra, Abdullah Basaleh, Fayzul Kabir, Mohammad Al-Suwaiyan, Mehvish Bilal
Aqueous phase bromate (BrO 3– ) treatment using a commercial granular activated carbon (GAC, FILTRASORB 400) indicated that bromate removal is highly influenced by the operational factors such as pH, initial bromate concentration, contact time and the adsorbent dosage. The effect of pH on bromate treatment indicated higher to significant bromate removal at pH ≤ 4, whereas for pH range 5–9 ~ 50% bromate removal was noted. At pH higher than 9, a significant decrease in the bro - mate removal was noted that was ascribed to changes in the GAC surface speciation. Furthermore, a higher mass-based bromate removal transpired with an increase in the initial bromate concen - tration that was explained based on higher mass transfer and diffusion. Also, the bromate adsorp - tion experimental data fitted well to the Freundlich adsorption isotherm, indicating a multilayer bromate ions accumulation on the GAC surface. Furthermore, an increasing ‘ q e vs. C e ’ trend also implied a multilayer bromate ions attachment on the GAC surface. Moreover, the kinetics exper - iments showed that the pseudo-second-order kinetic model better describes the respective GAC-based bromate removal as compared to pseudo-first-order kinetic model. This indirectly indicated that the removal of bromate using granular activated carbon is a more involved process, with both adsorption and reduction causing the noted bromate removal ( GAC-BrO 3 ↔ GAC-BrO ↔ GAC -Br). It is suggested that initially the adsorbed BrO 3 – ion is reduced to BrO – (hypobromite) followed by a further reduction of BrO – to Br – (bromide) ion. Additionally, as the surface bound bromate ion is reduced to bromide, it would cause further mass transfer of solution phase bromate ion towards the GAC surface, which is also indirectly supported by the aforementioned Freundlich based multilayer bromate removal trend.
{"title":"Aqueous bromate (BrO3-) removal using FILTRASORB 400 activated carbon: effect of process variables and modeling","authors":"Muhammad Vohra, Abdullah Basaleh, Fayzul Kabir, Mohammad Al-Suwaiyan, Mehvish Bilal","doi":"10.5004/dwt.2023.29671","DOIUrl":"https://doi.org/10.5004/dwt.2023.29671","url":null,"abstract":"Aqueous phase bromate (BrO 3– ) treatment using a commercial granular activated carbon (GAC, FILTRASORB 400) indicated that bromate removal is highly influenced by the operational factors such as pH, initial bromate concentration, contact time and the adsorbent dosage. The effect of pH on bromate treatment indicated higher to significant bromate removal at pH ≤ 4, whereas for pH range 5–9 ~ 50% bromate removal was noted. At pH higher than 9, a significant decrease in the bro - mate removal was noted that was ascribed to changes in the GAC surface speciation. Furthermore, a higher mass-based bromate removal transpired with an increase in the initial bromate concen - tration that was explained based on higher mass transfer and diffusion. Also, the bromate adsorp - tion experimental data fitted well to the Freundlich adsorption isotherm, indicating a multilayer bromate ions accumulation on the GAC surface. Furthermore, an increasing ‘ q e vs. C e ’ trend also implied a multilayer bromate ions attachment on the GAC surface. Moreover, the kinetics exper - iments showed that the pseudo-second-order kinetic model better describes the respective GAC-based bromate removal as compared to pseudo-first-order kinetic model. This indirectly indicated that the removal of bromate using granular activated carbon is a more involved process, with both adsorption and reduction causing the noted bromate removal ( GAC-BrO 3 ↔ GAC-BrO ↔ GAC -Br). It is suggested that initially the adsorbed BrO 3 – ion is reduced to BrO – (hypobromite) followed by a further reduction of BrO – to Br – (bromide) ion. Additionally, as the surface bound bromate ion is reduced to bromide, it would cause further mass transfer of solution phase bromate ion towards the GAC surface, which is also indirectly supported by the aforementioned Freundlich based multilayer bromate removal trend.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Due to climate change in recent years, the degradation of most glaciers on the Qinghai–Tibet Plateau has accelerated the expansion of glacial lakes. Based on the polarization entropy difference between water and non-water signals, this paper studies the classification method of glacial lake in snowmelt period by using the dual-polarization time series synthetic aperture radar (SAR) images as data sources, and proposes a method for extracting and dynamically monitoring glacial lake based on the normalized polarization entropy ratio of dual-polarization SAR images. In order to verify the feasibility of the method, the Sentinel-1 dual-polarization image sequence of ESA was selected to carry out the dynamic extraction of glacial lakes and the analysis of long-term temporal variations on a time span of 4a for the typical experimental area located in the glacier basin of A’nyemaqen. The spatial and temporal changes of the glacial lake at the end of the A’nyemaqen glacier during 2019–2022 were successfully obtained through experiments, and then it was found that the area of the glacial lake near 4a was decreasing.
{"title":"Monitoring of interannual variabilities of glacial lakes at the end of A’nyemaqen glacier utilizing PolSAR images","authors":"Rui Guo, Qiming Zeng","doi":"10.5004/dwt.2023.29693","DOIUrl":"https://doi.org/10.5004/dwt.2023.29693","url":null,"abstract":"Due to climate change in recent years, the degradation of most glaciers on the Qinghai–Tibet Plateau has accelerated the expansion of glacial lakes. Based on the polarization entropy difference between water and non-water signals, this paper studies the classification method of glacial lake in snowmelt period by using the dual-polarization time series synthetic aperture radar (SAR) images as data sources, and proposes a method for extracting and dynamically monitoring glacial lake based on the normalized polarization entropy ratio of dual-polarization SAR images. In order to verify the feasibility of the method, the Sentinel-1 dual-polarization image sequence of ESA was selected to carry out the dynamic extraction of glacial lakes and the analysis of long-term temporal variations on a time span of 4a for the typical experimental area located in the glacier basin of A’nyemaqen. The spatial and temporal changes of the glacial lake at the end of the A’nyemaqen glacier during 2019–2022 were successfully obtained through experiments, and then it was found that the area of the glacial lake near 4a was decreasing.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Contents Vol. 294","authors":"","doi":"10.5004/dwt.2023.29711","DOIUrl":"https://doi.org/10.5004/dwt.2023.29711","url":null,"abstract":"","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"215 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89199119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vortex cavitation may be harnessed to intensify many industrial processes. It is essential to develop a highly efficient vortex cavitator for refractory organics degradation. In the present work, a novel swirling vortex cavitator designed with a special structure of six vortex cavities and spiral flow passages was optimized using computational fluid dynamics (CFD) method by the aid of Gambit software and ANSYS fluid simulation software, and its oxytetracycline degradation characteris tics were investigated. The optimized vortex cavitaor was superior to the original vortex cavitator resulting from more hydroxyl radicals generated during operation and higher oxytetracycline deg radation efficiencies. The degradation efficiency was 89.52% and 92.41% of about 2.0 mg/L initial concentration of oxytetracycline in 10 L solution at 80 min by the original and optimized swirling vortex cavitator, respectively. The optimized vortex cavitator also showed good oxytetracycline deg radation ability in aquaculture simulation wastewater. All the degradation processes followed the secondorder kinetics model. In the two degradation pathways, multiple byproducts were gener ated by dealkylation, deamination, dihydroxylation and ringopening induced by vortex cavitation effect.
{"title":"CFD simulation optimization of a swirling vortex cavitator and its oxytetracycline degradation characteristics: kinetics and degradation pathway","authors":"Bao’e Wang, Rihong Zhang, Yiyong Li, Xiaomin Lian","doi":"10.5004/dwt.2023.29382","DOIUrl":"https://doi.org/10.5004/dwt.2023.29382","url":null,"abstract":"Vortex cavitation may be harnessed to intensify many industrial processes. It is essential to develop a highly efficient vortex cavitator for refractory organics degradation. In the present work, a novel swirling vortex cavitator designed with a special structure of six vortex cavities and spiral flow passages was optimized using computational fluid dynamics (CFD) method by the aid of Gambit software and ANSYS fluid simulation software, and its oxytetracycline degradation characteris tics were investigated. The optimized vortex cavitaor was superior to the original vortex cavitator resulting from more hydroxyl radicals generated during operation and higher oxytetracycline deg radation efficiencies. The degradation efficiency was 89.52% and 92.41% of about 2.0 mg/L initial concentration of oxytetracycline in 10 L solution at 80 min by the original and optimized swirling vortex cavitator, respectively. The optimized vortex cavitator also showed good oxytetracycline deg radation ability in aquaculture simulation wastewater. All the degradation processes followed the secondorder kinetics model. In the two degradation pathways, multiple byproducts were gener ated by dealkylation, deamination, dihydroxylation and ringopening induced by vortex cavitation effect.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"12 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87476374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Priyanka Shrivastava, M. Dwivedi, V. Malviya, P. Jain, A. Yadav, N. Jain
{"title":"Adsorption of crystal violet dye from aqueous solution by activated sewage treatment plant sludge","authors":"Priyanka Shrivastava, M. Dwivedi, V. Malviya, P. Jain, A. Yadav, N. Jain","doi":"10.5004/dwt.2023.29210","DOIUrl":"https://doi.org/10.5004/dwt.2023.29210","url":null,"abstract":"","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"27 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87535699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The sludge dewatering is a significant part of municipal wastewater treatment industry, and efficient disposal techniques for the sludge dewatering is still a challenge among worldwide environmental fields. To achieve sludge reduction, the research and exploitation of environment-friendly natural polymer dehydrating agents have caused broad attention. In this study, a coconut shell-based composite was prepared by grafting hydroxypropyltrimethyl ammonium chloride chitosan (HACC) on the surface of coconut shell skeleton particles as a novel type of dewatering agent. The response surface methodology was used to optimize the preparation process of grafted coco-nut shell-based skeleton particles. The consumption per unit area of HACC could reach 0.1732 g/g under the optimal preparation conditions: reaction temperature at 40°C, material particle size at 120–200 mesh, mass ratio of M1:M2 at 0.75 without dilution, and ultrasonic time for 5 min. Compared to the composites without graft, the dewatering rate of sludge was obviously improved by the grafted coconut shell-based composites under the same treatment procedures. Moreover, the grafted coconut shell-based composite also possessed the potential for effectively adsorbing the total organic matters in sludge dewatering filtrate. This work provides a promising dehydrating agent and disposal method for the practical application of municipal sludge dewatering.
{"title":"Preparation and application of coconut shell-based skeleton particles coupled with hydroxypropyltrimethyl ammonium chloride chitosan in sludge dewatering","authors":"Shici Zhang, Ying Zhang, Haohan Xu, Qi Liu, Xiang Wan, Jiajia Xia, Longkai Li, Hui Zhang, Xujie Lu","doi":"10.5004/dwt.2023.29658","DOIUrl":"https://doi.org/10.5004/dwt.2023.29658","url":null,"abstract":"The sludge dewatering is a significant part of municipal wastewater treatment industry, and efficient disposal techniques for the sludge dewatering is still a challenge among worldwide environmental fields. To achieve sludge reduction, the research and exploitation of environment-friendly natural polymer dehydrating agents have caused broad attention. In this study, a coconut shell-based composite was prepared by grafting hydroxypropyltrimethyl ammonium chloride chitosan (HACC) on the surface of coconut shell skeleton particles as a novel type of dewatering agent. The response surface methodology was used to optimize the preparation process of grafted coco-nut shell-based skeleton particles. The consumption per unit area of HACC could reach 0.1732 g/g under the optimal preparation conditions: reaction temperature at 40°C, material particle size at 120–200 mesh, mass ratio of M1:M2 at 0.75 without dilution, and ultrasonic time for 5 min. Compared to the composites without graft, the dewatering rate of sludge was obviously improved by the grafted coconut shell-based composites under the same treatment procedures. Moreover, the grafted coconut shell-based composite also possessed the potential for effectively adsorbing the total organic matters in sludge dewatering filtrate. This work provides a promising dehydrating agent and disposal method for the practical application of municipal sludge dewatering.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Author Index Vol. 282","authors":"","doi":"10.5004/dwt.2023.29402","DOIUrl":"https://doi.org/10.5004/dwt.2023.29402","url":null,"abstract":"","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"6 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77625904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Future vision of using nuclear energy for desalination plants in Egypt","authors":"Mohamed K. Shaat, L. Shouman, D. A. Fadel","doi":"10.5004/dwt.2023.29511","DOIUrl":"https://doi.org/10.5004/dwt.2023.29511","url":null,"abstract":".","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"39 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78966005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ji-wei Zhao, Zhihong Wei, Shang-pan Huang, Ling Li, Jinhuan Ma
{"title":"Photocatalytic properties of bismuth oxyiodide nanomaterials with different morphologies","authors":"Ji-wei Zhao, Zhihong Wei, Shang-pan Huang, Ling Li, Jinhuan Ma","doi":"10.5004/dwt.2023.29150","DOIUrl":"https://doi.org/10.5004/dwt.2023.29150","url":null,"abstract":"","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"141 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76611195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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