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Groundwater arsenic removal by coagulation using ferric(III) sulfate and polyferric sulfate: A comparative and mechanistic study
Cui, Jinli; Jing, Chuanyong; Che, Dongsheng; Zhang, Jianfeng; Duan, Shuxuan
2015-06-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
Volume32Issue:1Pages:42-53
AbstractElevated arsenic (As) in groundwater poses a great threat to human health. Coagulation using mono-and poly-Fe salts is becoming one of the most cost-effective processes for groundwater As removal. However, a limitation comes from insufficient understanding of the As removal mechanism from groundwater matrices in the coagulation process, which is critical for groundwater treatment and residual solid disposal. Here, we overcame this hurdle by utilizing microscopic techniques to explore molecular As surface complexes on the freshly formed Fe flocs and compared ferric(III) sulfate (FS) and polyferric sulfate (PFS) performance, and finally provided a practical solution in As-geogenic areas. FS and PFS exhibited a similar As removal efficiency in coagulation and coagulation/filtration in a two-bucket system using 5 mg/L Ca(ClO)(2). By using the two-bucket system combining coagulation and sand filtration, 500 L of As-safe water (< 10 mu g/L) was achieved during five treatment cycles by washing the sand layer after each cycle. Fe k-edge X-ray absorption near-edge structure (XANES) and As k-edge extended X-ray absorption fine structure (EXAFS) analysis of the solid residue indicated that As formed a bidentate binuclear complex on ferrihydrite, with no observation of scorodite or poorly-crystalline ferric arsenate. Such a stable surface complex is beneficial for As immobilization in the solid residue, as confirmed by the achievement of much lower leachate As (0.9 mu g/L-0.487 mg/L) than the US EPA regulatory limit (5 mg/L). Finally, PFS is superior to FS because of its lower dose, much lower solid residue, and lower cost for As-safe drinking water. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Department环境化学与生态毒理学国家重点实验室
KeywordGroundwater As Removal Ferric(Iii) Sulfate (Fs) Polyferric Sulfate (Pfs) Coagulation Exafs Leaching
WOS Research AreaEnvironmental Sciences
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Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/32586
Collection环境化学与生态毒理学国家重点实验室
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GB/T 7714
Cui, Jinli,Jing, Chuanyong,Che, Dongsheng,et al. Groundwater arsenic removal by coagulation using ferric(III) sulfate and polyferric sulfate: A comparative and mechanistic study[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2015,32(1):42-53.
APA Cui, Jinli,Jing, Chuanyong,Che, Dongsheng,Zhang, Jianfeng,&Duan, Shuxuan.(2015).Groundwater arsenic removal by coagulation using ferric(III) sulfate and polyferric sulfate: A comparative and mechanistic study.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,32(1),42-53.
MLA Cui, Jinli,et al."Groundwater arsenic removal by coagulation using ferric(III) sulfate and polyferric sulfate: A comparative and mechanistic study".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 32.1(2015):42-53.
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