Department of Civil and Environmental Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA.
Department of Environmental Engineering, Kwangwoon University, Seoul, South Korea.
Environ Technol. 2021 Jan;42(3):397-409. doi: 10.1080/09593330.2019.1629634. Epub 2019 Jun 20.
People who drink groundwater in rural areas of Southeast Asia are exposed to pathogens and arsenic (As)-related health problems. A water treatment system consisting of electrocoagulation reactors, using iron (Fe) electrodes and a filtration tank, was designed to treat complex contaminated groundwater for drinking. Its applicability was demonstrated near the Red River in Vietnam. The water treatment system reduced 10.3 CFU/mL of total coliform and 376 μg/L of As(III) in the groundwater to 0 CFU/mL and 6.68 μg/L, respectively. Total coliforms were attenuated by Fe(II) infiltration or enmeshed during Fe precipitate formation. Of the total As, 43% formed As(III) complexation with the Fe precipitates and the other 57% was oxidized to As(V) then adsorbed to Fe precipitates. The Fe precipitates, containing total coliforms and As, were separated from the discharge water in the filtration tank. The system required 49 W of power to operate, which equates to 423 kWh/year, to continuously purify 0.5 t water/day. This requirement was powered by a 380-750 W solar panel, without external energy supply, making the water treatment system an appropriate option for addressing drinking water problems in rural areas.
在东南亚农村地区饮用地下水的人们面临病原体和与砷（As）相关的健康问题。一个由电凝反应器组成的水处理系统，使用铁（Fe）电极和过滤罐，旨在处理受污染的复杂地下水以供饮用。该系统在越南红河附近得到了应用。该水处理系统将地下水中的总大肠菌群减少了 10.3 CFU/mL，将砷（III）减少了 376 μg/L，分别降至 0 CFU/mL 和 6.68 μg/L。总大肠菌群通过 Fe(II)的渗透或在 Fe 沉淀物形成过程中被包裹而被衰减。总砷的 43%与 Fe 沉淀物形成 As(III)络合物，其余 57%被氧化为 As(V)，然后被吸附到 Fe 沉淀物上。含有总大肠菌群和砷的 Fe 沉淀物在过滤罐中从排放水中分离出来。该系统每天连续净化 0.5 吨水需要 49 瓦的功率，相当于每年 423 千瓦时，这一需求由一个 380-750 瓦的太阳能电池板提供，无需外部能源供应，使水处理系统成为解决农村地区饮用水问题的合适选择。
