津河水体藻污染监测识别及无机混凝剂除藻效能研究

Monitoring and identification of algae contamination in Jinhe River and purification effect of inorganic coagulants

针对津河水体开展长达18个月的定点采样监测分析,对造成藻华现象的优势藻种进行了显微识别。结果表明,近两年津河水体总体为富营养化状态,其中每年7、8月份藻华暴发,呈现重富营养化特征,经观察鉴别属于微囊藻型蓝藻污染。以Chl-a、浊度及UV254为主要水质参数,探索投加无机混凝剂用于藻污染控制的可行性,并对4种混凝剂的藻污染控制效果进行了比较。结果表明,投加无机混凝剂控制津河藻污染效果显著(聚合氯化铝对Chl-a和浊度去除率分别高达89%和92%),相同实验环境下混凝净化效能依次为:PAC(聚合氯化铝)>PFS(聚合硫酸铁)>FC(三氯化铁)>AS(硫酸铝)。

Sampling and monitoring analysis was conducted over a period of 18 months in the Jinhe River Basin, and the dominant species causing the algae bloom in the river were identified through microscopic examination. The results show that the Jinhe River has been in a eutrophic state on the whole over the last two years, especially in July and August, when severe eutrophication has taken place, and microcystic cyanobacteria have largely contributed to the algae contamination. The applicability of inorganic coagulants to algae contamination control was investigated, using chlorophyll a, turbidity, and UV254 as the major water quality parameters. The effects of four kinds of coagulants in controlling the algae contamination were compared. The results show that the inorganic coagulants were effective in controlling algae contamination of the Jinhe River （ the removal rates of chlorophyll a and turbidity reached 89% and 92%, respectively, when polyaluminium chloride was used ） . Under the same experimental conditions, the four coagulants were ranked by performance in the following descending order：polyaluminium chloride, polymeric ferric sulfate, ferric chloride, and aluminum sulfate.