常规工艺下原水中藻类去除效果的研究

Study on the removal effect of algae in raw water under conventional treatment process

对某水厂原水、过程水和出厂水藻类进行为期1 a的采样监测和分析发现,原水全年均处于富营养水平,且在3月和4月的富营养水平较为显著;混凝沉淀阶段可以去除原水中绝大部分藻类,藻类去除率通常在90%以上,后续工艺主要是通过消毒剂抑制藻类的生长繁殖;出厂水中少量的藻类对水质感官指标影响不大。当原水藻类大量增长时,可通过强化混凝沉淀和预处理提高常规工艺去除藻类的能力,同时有必要对原水藻类和出厂水消毒剂指标进行常规监测。

An one-year sampling,monitoring and analysis of algae in the raw water,processing water and treated water of a waterworks showed that the raw water was in eutrophication level all year round,and more significant in March and April.Most of the algae from the raw water could be removed by the coagulation and sedimentation stages,with removal rate usually above 90%.Growth and reproduction of algae was inhibited mainly through disinfectants in the following process,and small amount of algae in the treated water had little effect on the sensory index of water quality.When the algae in raw water increased greatly,the ability of algae removal by conventional process could be improved through enhanced coagulation-sedimentation and pretreatment.At the same time,it was necessary to carry out routine monitoring on algae in raw water and disinfectant in treated water.