淡江大學機構典藏:Item 987654321/123112
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    题名: Evaluation of the dual-process approach for in-situ groundwater arsenic removal
    作者: Wang, Sheng-Wei;Pan, Shu-Yuan;Kao, Yu-Hsuan;Kim, Hyunook;Fan, Chihhao
    关键词: Groundwater;arsenic removal;dual process;irrigation
    日期: 2022-07-20
    上传时间: 2023-04-28 16:58:45 (UTC+8)
    出版者: Taylor & Francis
    摘要: While the worldwide distribution of geogenic arsenic (As)-affected groundwater is highly overlapped with the areas with abundant groundwater, utilization of As-contained groundwater is an inevitable compromise in those areas where surface water is not enough for irrigation. Since the occurrence of As in groundwater is often accompanied by high iron (Fe) contents, the facilitation of As and Fe precipitation without adding additional oxidizers and adsorbents is considered an environmental-friendly approach to removing As in groundwater. In the present study, the oxidation/filtration dual-process with sprinkling height of 25 cm and 120 kg filter media efficiently increased the dissolved oxygen (DO) concentration (0.36–1.52 mg/L) and oxidation–reduction potential (ORP) (24–63 mV), which facilitated the formation of Fe oxides and As co-precipitation. The correlation of As removal efficiencies with their respective flow rates indicated that a decrease in groundwater Fe and an increase of Fe in sands and gravels filters as the flow rate increased evidenced the rapid oxidation of Fe to form the Fe hydroxides. In a 40-hour continuous aeration/filtration operation, As and Fe concentrations in groundwater were reduced by 79.5% and 64.88% within 40 hrs, respectively. The ease of filter replacement and cost-effectiveness in operation can be the major attractions and innovations for future field practices.
    關聯: Environmental Technology
    DOI: 10.1080/09593330.2022.2100283
    显示于类别:[水資源及環境工程學系暨研究所] 期刊論文

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