2种典型预氧化工艺对混凝去除假鱼腥藻及其代谢嗅味物质2-MIB的影响机制

Effect of two typical pre-oxidation processes on removal of preudanabaena sp.and its metabolites 2-MIB during coagulation

以原水中常见产嗅假鱼腥藻为对象,研究Al3+混凝工艺对假鱼腥藻及其代谢嗅味物质2-甲基异莰醇(2-Methylisoborneol简称2-MIB)的去除效果.结果表明最优Al^(3+)投量为3 mg/L.同时,研究了高锰酸钾与次氯酸钠预氧化对混凝效果的影响:低浓度高锰酸钾对混凝效果影响不明显,浓度增加至2 mg/L时,混凝效果开始下降;次氯酸钠预氧化不仅会降低混凝效果,还会导致胞内2-MIB释放.三维荧光数据表明预氧化会导致藻细胞破裂使得胞内有机物释放,并影响混凝效果.

With preudanabaena sp.,the common algae in raw water,as research object,the removal efficiency of preudanabaena sp.and the metabolized odor and taste compound,2-MIB was studied by using Al^（3＋） coagulation.The results show that the optimal dosage of Al^（3＋） is 3 mg/L.Meanwhile,pre-oxidation with potassium permanganate and sodium hypochlorite were applied in order to enhance the coagulation.It is observed that low concentrations of potassium permanganate has no significant effect on coagulation while the peroxidation exhibits negative impact on the coagulation when MnO_4-is increased to 2 mg/L,and the pre-oxidation with sodium hypochlorite even leads to the release of intracellular 2-MIB.Three-dimensional fluorescence data indicates that pre-oxidation process leads the release of intracellular organisms by cell lysis,which will have effect on the coagulation.