Microbial Community Analysis in Bio-filter Bed of Iron and Manganese Removal Treating High Iron, Manganese and Ammonia Nitrogen Groundwater

摘要

The integrated process of spray aeration, falling water aeration and bio-filter bed was used for treating groundwater with high iron, manganese and ammonia nitrogen (NH_4~+-N). The removal efficiencies of iron, manganese and NH_4~+-N reached 99.1%, 95.0% and 85.2%, and corresponding effluent iron and manganese decreased to 0.1 and 0.05 mg/L. Microbial analysis results indicated that the β-Proteobacteria was predominant microorganisms, in which Gallionella and Leptothrix were main iron-removal bacteria and manganese-removal bacteria, respectively. Simultaneously, Pseudomona, belonged to γ-Proteobacteria, could absorb and oxidize free manganese to be manganese dioxide (MnO_2) by extracellular oxidase.