生物除锰滤池对砷(Ⅲ)的去除效果研究

Effect of Arsenic(Ⅲ)Removal by Biofilter for Manganese Removal

砷是对人体有毒害作用的典型元素,且在水源水中普遍存在.为此人工配制了含As（Ⅲ）为0.05～0.25 mg/L、Mn2＋为0.5～3.0 mg/L的原水,并通过已培养成熟的生物除锰滤池进行过滤,分别考察了滤速为3、5、7 m/h时滤池对As（Ⅲ）及Mn2＋的去除效果.结果表明,在开始阶段由于受原水中As（Ⅲ）的影响,滤池的除锰能力有所下降,出水As（Ⅲ）也不能达标;经过15 d左右的运行培养后,滤池表现出了良好的除锰和除砷能力,出水As（Ⅲ）、Mn2＋浓度分别为0.02mg/L和0.05 mg/L左右.经过对不同取样口的水样进行检测,发现滤池的除砷能力集中在厚度为0～800 mm的滤层.

Arsenic is a typical element poisonous to human, and exists generally in source water. Synthetic raw water is prepared, including As（Ⅲ） of 0.05-0.25 mg/L and Mn2^＋ of 0.5 - 3.0 mg/L, then filtrated by the biofilter that has been brought up to well-rounded. The effect of As（Ⅲ） and Mn2^＋ removal at filtering rate of 3.5 and 7 m/h. The results indicate that in the beginning, as a result of As （Ⅲ） in the raw water, the ability of manganese removal by the biofiher declines, and the As（Ⅲ） concentration in the filtrated water can not reach the standard. After cultivation for 15 days, good effects of arsenic and manganese removal are appeared. The concentrations of As （Ⅲ） and Mn2^＋ in the filtrated water are 0.02 mg/L and 0.05 mg/L respectively. The ability of arsenic removal by the biofilter is found concentrating in the 0 - 800 mm deepness of the filter bed ＂after measuring the samples from different sampling places.