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中文摘要：
为研究夏季净水厂回用水中藻类繁殖问题,对天津某水厂各水处理单元内藻类含量变化进行调查,结果表明净水厂废水回用有可能导致四角角星鼓藻繁殖,构成新的污染源,原水与回用水混合后经预氯化—混凝沉淀—过滤工艺处理,沿程四角角星鼓藻可占藻类总量的16%～60%,是各单元处理后水中残留的主要藻类之一,并且少量四角角星鼓藻可穿透滤池,影响供水安全。对该藻繁殖原因分析研究表明,铁浓度0.6～2mg/L时四角角星鼓藻具有较快生长速率,混凝剂投加造成生产废水中铁残留量较高是四角角星鼓藻在回流池获得竞争优势的主要原因。
英文摘要：
Taking the square-pointed star desmids as case study,this paper studied the algae reproduction in the reclaimed water of water treatment plant.The variance of algae in water processing units of a water treatment plant in Tianjing were studied and the results showed：the reclaimed water in water treatment plant might be the cause of the square-pointed star desmids reproduction and produce the new pollution;if the mixture of raw water and reclaimed water was treated by the combination of prechlorination-coagulation and sedimentation-filtration,the proportion of square-pointed star desmids in all algae could be 16% to 60% and be the main remaining algae in processing units;small quantity of square-pointed star desmids could penetrate the filter and do harm to the water quality.Analysis of the reproduction of this kind of algae showed that the square-pointed star desmids could reproduce rapidly when the iron content was between 0.6～2 mg/L,and the high content of remaining iron in production wastewater caused by coagulant was the main reason for the advantage of square-pointed star desmids in the competition.
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