空气氧化除Fe^(2+)理论与生物除Fe^(2+)除Mn^(2+)工艺技术研究(Ⅰ)

Study on the Mechanism of Iron Removal by Air Oxidation and the Technology of Biological Removal of Fe 2+ , Mn 2+ (I)

水质工程界认为MnO_2或Mn_3O_4是Mn^(2+)接触氧化的催化剂,但国内外除Fe^(2+)除Mn^(2+)水厂的出厂水中Mn^(2+)含量却一直达不到水质标准。通过滤柱模型试验和水厂的生产试验证实了曝气-过滤的除Mn^(2+)过程是生物的催化氧化作用的结果。随着除Mn^(2+)滤层中以除Mn^(2+)菌为核心的生物群系的增殖,Mn^(2+)的去除效率不断增强。在成熟滤层中每毫升湿砂上存在着不少于n×10~5～n×10~6个具有除Mn^(2+)能力的细菌。成熟砂和未成熟砂经高压灭菌后,仍然具有除Mn^(2+)能力,但经含Mn^(2+)溶液浸泡60h后,就丧失了除Mn^(2+)能力,灭菌后短暂的除Mn^(2+)能力是滤砂表面吸附容量再生了的结果。以此确立了生物固Mn^(2+)除Mn^(2+)机理。

MnO2 and Mn3O4 have been regarded as the contact oxidation catalyzer of Mn2+. The manganese in filtrate has not reached the drinking water standard. It has been proved that manganese removal is a process of biological catalysis oxidation. With the reproduction of biome with manganese removal bacteria as the nucleus, manganese removal efficiency increases. The population of manganese oxidizing bacteria is no less than nX105-nX106/mL. After sterilization mature and immature sands still have the capability of manganese removal, but after dipped in the solution of Mn2+ for 60 h, the capability disappeared. The transient manganese removal capability is the result of regeneration of adsorption capacity. The mechanism of biological fixation and removal of manganese is just based on these.