曝气强度对地下水生物除铁除锰影响的研究

Effect of aeration in the biological iron and manganese removal of groundwater

为了研究曝气在生物除铁除锰中的作用，确定合理的曝气方式和曝气强度。采用曝气＋一级过滤工艺进行现场试验，三座试验滤柱曝气强度分别为高强度曝气、低强度曝气和不曝气三种，对三座滤柱的出水铁、锰含量及生物相进行了对比研究，并从水中DO、碳源、Fe^2＋、Fe^3＋絮凝物的影响等方面进行了机理分析。结果表明：原水Fe^2＋、Mn^2＋含量不超过5～6mg·L^-1和1．8～3．2mg·L^-1时，采用低强度曝气（DO=7mg·L^-1左右），处理效果较好，出水铁、锰的合格率分别可达100％和83％。

The effects of aeration on biological iron and manganese removal in groundwater were investigated and the appropriate aeration pattern was established. The mechanism of the effects of DO, carbon source., Fe^2＋ and Fe^3＋ flocculation on Iron and manganese removal from three filters which under high aeration levels, low aeration levels and not aeration was analyzed. The results show that the removal rate of iron is 100% and manganese is 83% under low aeration levels（DO is about 7mg·L^-1）when Fe^2＋ 〈 5 -6 mg·L^-1and Mn^2＋ 〈 1.8 -3.2mg·L^-1 in groundwater.