不同水源预氧化混凝去除藻类及有机物研究

Research on the Removal of Algae and Organic Matter by Pre-oxidation and Coagulation of Different Water Sources

以微囊藻为优势藻的R水库原水及柱孢藻为优势藻的J水库原水为研究对象,分别进行预氧化混凝试验。采用二氧化氯与次氯酸钠作为预氧化剂,按照0∶1、1∶1及2∶1的质量浓度比搭配硫酸铝混凝剂,分析预氧化混凝对藻类及有机物的去除效果,建立合适的预氧化加药策略。结果表明,3种组合均可以提升混凝除藻效果。对于R水库原水,不建议使用二氧化氯及次氯酸钠进行预氧化;J水库原水使用二氧化氯搭配次氯酸钠比单独使用次氯酸钠去除藻类及有机物效果好。

The raw water of R reservoir with Microcystis as the dominant algae and the raw water of J reservoir with Cylindrospermopsis rackiborskii as the dominant algae are taken as the research objects,and the preoxidation coagulation processes are tested respectively. Chlorine dioxide and sodium hypochlorite are used as pre-oxidants,and the mass concentration ratios of 0∶1,1∶1 and 2∶1 are combined with aluminum sulfate coagulant to analyze the removal effect of pre-oxidation coagulation on algae and organic matter,and an appropriate pre-oxidation dosing strategy is established. The results showed that all the three combinations could improve the effect of algae coagulation. For raw water in R reservoir,chlorine dioxide and sodium hypochlorite are not recommended for pre-oxidation. The raw water of J reservoir using chlorine dioxide and sodium hypochlorite is better than that using sodium hypochlorite alone to remove algae and organic matter.