微藻对混凝除藻效率的影响及改善措施

EFFECT OF MICRO-ALGAL SPECIES ON ALGAE REMOVAL RATE IN COAGULATION AND MEASURES TO IMPROVE ALGAE REMOVAL

考察了富营养化水体中微型藻对混凝除藻效率的影响,以及控制"混凝-过滤"工艺出水中微藻的措施。微型藻含量增加会降低混凝除藻效率,因此微型藻的存在决定了混凝除藻效率的限度。微型藻大量存在时,预氧化可以改善混凝除藻的效率。增加过滤深度可以显著提高微型藻的去除效率,活性炭深度处理也可以有效地去除水中的微型藻。因此,决定富营养化源水除藻难易程度的主要因素是源水中藻类生物的种群结构,而不是叶绿素值。源水中藻类生物的种群结构决定了水厂除藻工艺的选择。加强水源水保护,生态调控优化源水中藻类生物种群结构是解决水厂除藻问题的根本途径。

The effect of micro-algal species on algae removal rate in coagulation, and the measures to control algae concentration in the effluent of coagulation- filtration process were investigated. The increase of micro-species fraetion would decrease algae removal rate in coagulation, consequently, the algae removal rate in coagulation was determined by micro-algal species. When more algal species existed, pre-oxidation might improve algae removal. The increase of filtration bed depth could increase micro-algal species removal rate noticeably. Moreover, deep treatment of activated carbon could also remove micro-algal species fi＇om water efficiently. Therefore, the difficulty in removing algae was mainly determined by structure of algal species population, rather than content of chlorophyll in the eutrophicated raw water. The choice of process to remove algae in water works was determined by structure of algal species population. Enhancing raw water conservation, regulating and optimizing structure of algal species population were fundamental approach to solve the problem of algae removal in water works.