{"title":"Antimicrobial Resistance Profiles of Bacterial Community in Premise Plumbing before and after Water Stagnation","authors":"Nga Thi Nguyen, F. Kurisu, H. Furumai, I. Kasuga","doi":"10.2965/jwet.22-063","DOIUrl":"https://doi.org/10.2965/jwet.22-063","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69271125","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}
Naturally occurring colloids, particles of diameter < 2 μm, are ubiquitous in geo environments and can potentially facilitate transport of numerous contaminants in soil via colloid-facilitated transport (CFT). Colloid mobilization, transport and CFT in various geo-media are highly sensitive to physico-chemical perturbations. This study investigated colloid, and colloid facilitated cadmium transport in saturated porous media with a series of column experiments. Soil colloids were extracted from soils belonging to two areas affected by chronic kidney disease of unknown etiology (CKDu) in Sri Lanka. Colloid breakthrough curves were obtained from the column studies under different flow rates (0.50, 1.60, and 4.00 ± 0.05 cm3/s) and ionic strengths (0.01, 0.05, and 0.10 M NaCl). The CFT was studied using Cd(II) as a model contaminant together with colloidal suspension under selected scenarios for high colloidal deposition. Elevated colloid concentrations were observed in highly CKDu affected area. The experimental results were numerically simulated on an advection-diffusion/dispersion modelling framework coupled with first-order attachment, detachment and straining parameters inversely estimated using Hydrus 1D software. Experimental and simulated colloid breakthrough curves showed a good agreement and recognized colloid attachment as the key retention mechanism. Both colloids and CFT of Cd(II) showed pronounced deposition under low flow rates and high ionic strengths.
天然存在的胶体，即直径< 2 μm的颗粒，在地质环境中普遍存在，并且可能通过胶体促进运输(CFT)促进土壤中许多污染物的运输。胶体在各种地质介质中的动员、运输和CFT对物理化学扰动高度敏感。本研究通过一系列的柱实验研究了胶体对镉在饱和多孔介质中运移的促进作用。土壤胶体是从斯里兰卡两个受病因不明的慢性肾病(CKDu)影响地区的土壤中提取的。得到了不同流速(0.50、1.60和4.00±0.05 cm3/s)和离子强度(0.01、0.05和0.10 M NaCl)下的胶体突破曲线。以Cd(II)和胶体悬浮液为模型污染物，在选定的高胶体沉积条件下对CFT进行了研究。高CKDu感染区胶体浓度升高。实验结果在平流-扩散/弥散模型框架上进行了数值模拟，并使用Hydrus 1D软件反演了一阶附着、分离和应变参数。实验与模拟的胶体突破曲线吻合较好，认为胶体附着是关键的截留机制。在低流速和高离子强度条件下，Cd(II)的胶体和CFT均有明显的沉积。
{"title":"Transport of Colloids and Colloid-facilitated Cadmium in a Sri Lankan Agricultural Soil","authors":"Balakrishnan Banithy, Thilini Gunawardhana, Chamindu Deepagoda","doi":"10.2965/jwet.22-102","DOIUrl":"https://doi.org/10.2965/jwet.22-102","url":null,"abstract":"Naturally occurring colloids, particles of diameter < 2 μm, are ubiquitous in geo environments and can potentially facilitate transport of numerous contaminants in soil via colloid-facilitated transport (CFT). Colloid mobilization, transport and CFT in various geo-media are highly sensitive to physico-chemical perturbations. This study investigated colloid, and colloid facilitated cadmium transport in saturated porous media with a series of column experiments. Soil colloids were extracted from soils belonging to two areas affected by chronic kidney disease of unknown etiology (CKDu) in Sri Lanka. Colloid breakthrough curves were obtained from the column studies under different flow rates (0.50, 1.60, and 4.00 ± 0.05 cm3/s) and ionic strengths (0.01, 0.05, and 0.10 M NaCl). The CFT was studied using Cd(II) as a model contaminant together with colloidal suspension under selected scenarios for high colloidal deposition. Elevated colloid concentrations were observed in highly CKDu affected area. The experimental results were numerically simulated on an advection-diffusion/dispersion modelling framework coupled with first-order attachment, detachment and straining parameters inversely estimated using Hydrus 1D software. Experimental and simulated colloid breakthrough curves showed a good agreement and recognized colloid attachment as the key retention mechanism. Both colloids and CFT of Cd(II) showed pronounced deposition under low flow rates and high ionic strengths.","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"72 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":"136054216","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}
H. Ishizawa, Yukiko Kaji, Yuki Shimizu, M. Kuroda, D. Inoue, Ayaka Makino, R. Nakai, H. Tamaki, M. Morikawa, M. Ike
{"title":"Spontaneous Cell Lysis by Pelomonas saccharophila MRB3 Provides Plant-Available Macronutrients in Hydroponic Growth Media and Accelerates Biomass Production of Duckweed","authors":"H. Ishizawa, Yukiko Kaji, Yuki Shimizu, M. Kuroda, D. Inoue, Ayaka Makino, R. Nakai, H. Tamaki, M. Morikawa, M. Ike","doi":"10.2965/jwet.22-054","DOIUrl":"https://doi.org/10.2965/jwet.22-054","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69270992","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":"Causal Relationships between Stream NO3− Concentrations at Baseflow Conditions and Key Regulating Factors in the Kinki Region of Japan, Including the Japan-sea Side Area and Encompassing a Climatic Gradient","authors":"S. Makino, N. Tokuchi, Y. Komai","doi":"10.2965/jwet.22-078","DOIUrl":"https://doi.org/10.2965/jwet.22-078","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69271319","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}
Akimasa Miwa, A. K. Maharjan, K. Nishida, K. Mori, T. Toyama
{"title":"Characterization of Laboratory-scale Tidal Flow Constructed Wetlands in the Removal of Organic Carbon and Nitrogen from Sewage","authors":"Akimasa Miwa, A. K. Maharjan, K. Nishida, K. Mori, T. Toyama","doi":"10.2965/jwet.22-116","DOIUrl":"https://doi.org/10.2965/jwet.22-116","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69271472","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}
K. Hosoda, Yasutaka Yasui, Mitsuharu Nishikawa, Kento Iwatani, T. Ohara, Syunichiro Fujiwara, T. Segawa
{"title":"Levels of Two Earthy and Musty Odor Compounds, 2-Methylisoborneol and Geosmin, in Wastewater and Concentration Variations during Treatment","authors":"K. Hosoda, Yasutaka Yasui, Mitsuharu Nishikawa, Kento Iwatani, T. Ohara, Syunichiro Fujiwara, T. Segawa","doi":"10.2965/jwet.23-007","DOIUrl":"https://doi.org/10.2965/jwet.23-007","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69271632","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":"Control of Microcystis Buoyancy by Reducing Cellular Carbohydrate Content at High Temperature","authors":"Thoriq Teja Samudra, Y. Amano, M. Machida","doi":"10.2965/jwet.22-067","DOIUrl":"https://doi.org/10.2965/jwet.22-067","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69270757","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":"Growth Characteristics and Changes in Elemental Composition of Microcystis sp. under Various N:P Mass Ratios","authors":"Yuki Nariyama, Y. Amano, M. Machida","doi":"10.2965/jwet.22-064","DOIUrl":"https://doi.org/10.2965/jwet.22-064","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69271170","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":"Methane Emissions and Related Physicochemical Soil and Water Parameters in the Peat Swamp and Melaleuca Forests of U Minh Thuong National Park in Vietnam","authors":"D. Phuong, N. Loc, H. Diem","doi":"10.2965/jwet.22-133","DOIUrl":"https://doi.org/10.2965/jwet.22-133","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69271533","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":"Estimating Green and Blue Water Footprint of Major Cereal and Vegetable Crops in Salale Zone, Oromia, Ethiopia","authors":"Habtamu Adenew Ulatu, Tolossa Lamma Tola, Megersa Adugna","doi":"10.2965/jwet.21-156","DOIUrl":"https://doi.org/10.2965/jwet.21-156","url":null,"abstract":"","PeriodicalId":17480,"journal":{"name":"Journal of Water and Environment Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69270900","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}
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