北方某水厂蓝藻低温暴发期原水污染特征分析及去除

Characteristic Analysis of Raw Water Pollution and Its Removal during Low Temperature Outbreak of Cyanobacteria in a Water Plant in North China

北方某水源地于2015年9月17日—10月22日持续发生蓝藻水华,水质分析检测结果表明,蓝藻暴发期原水呈现低温、高藻、高浊、高有机物(CODMn)的特点,通过对自然条件、库区生态环境进行分析,结果表明水体富营养化是蓝藻暴发的主要原因。水厂通过采取优化预氧化、强化混凝、调整各工艺段的运行参数、适度降低运行负荷等综合运行措施,有效保证了出厂水水质达到国标要求,实现了安全平稳度过蓝藻水华期。

Cyanobacteria bloom took place in a water source in the north from September 17 to October 22,2015.By analyzing and monitoring the water quality,it was shown that the raw water had the characteristics of low temperature,high algae concentration,high turbidity and high organic(CODMn)concentration during cyanobacteria outbreak period.Natural condition and ecological environment of the reservoir area were analyzed.It was found that water eutrophication was the main cause of cyanobacteria outbreak.By adopting the measures of optimizing preoxidation process,enhancing coagulation,adjusting the operational parameters of each section and reducing running load moderately,effluent quality of the water plant could always meet the requirements of the national standard,and the water plant passed the cyanobacteria bloom period safely and smoothly.