Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1 Roosevelt Road, Sec. 4, Taipei 106, Taiwan.
J Contam Hydrol. 2013 Dec;155:1-8. doi: 10.1016/j.jconhyd.2013.09.001. Epub 2013 Sep 14.
Arsenic (As) contamination of groundwater is a significant public health concern. In this study, the removal of arsenic from groundwater using biological processes was investigated. The efficiency of arsenite (As(III)) bacterial oxidation and subsequent arsenate (As(V)) removal from contaminated groundwater using bacterial biomass was examined. A novel As(III)-oxidizing bacterium (As7325) was isolated from the aquifer in the blackfoot disease (BFD) endemic area in Taiwan. As7325 oxidized 2300μg/l As(III) using in situ As(III)-contaminated groundwater under aerobic conditions within 1d. After the oxidation of As(III) to As(V), As(V) removal was further examined using As7325 cell pellets. The results showed that As(V) could be adsorbed efficiently by lyophilized As7325 cell pellets, the efficiency of which was related to lyophilized cell pellet concentration. Our study conducted the examination of an alternative technology for the removal of As(III) and As(V) from groundwater, indicating that the oxidation of As(III)-contaminated groundwater by native isolated bacterium, followed by As(V) removal using bacterial biomass is a potentially effective technology for the treatment of As(III)-contaminated groundwater.
地下水砷污染是一个重大的公共卫生问题。本研究探索了利用生物过程去除地下水中的砷。考察了利用细菌生物量从受污染的地下水中氧化亚砷（As(III)）并随后去除砷酸盐（As(V)）的效率。从台湾黑脚病（BFD）流行地区含水层中分离出一种新型的亚砷酸盐（As(III)）氧化细菌（As7325）。As7325 在有氧条件下，1 天内可将原位污染的地下水中 2300μg/l 的 As(III)氧化。在将 As(III)氧化为 As(V)后，进一步使用 As7325 细胞团块来考察 As(V)的去除。结果表明，冻干的 As7325 细胞团块可有效地吸附 As(V)，其效率与冻干细胞团块浓度有关。本研究考察了一种从地下水中去除 As(III)和 As(V)的替代技术，表明利用本地分离细菌氧化受 As(III)污染的地下水，然后利用细菌生物量去除 As(V)是一种处理受 As(III)污染地下水的有效技术。
