The effect of natural organic matters(humic acid, fulvic acid) on algae removal by coagulation process was investigated and the mechanism thereof was also analyzed. The results of the test showed that: natural organic matter would compete against algae cells for flocculant. As natural organic matter had a strong affinity for PAC, it would be combined with PAC first, and then with algae cells; with the increase of nature organic matters in water, the algae-removal performance of coagulation process decreased. When the mass concentration of humic acid was 20.2 mg/L, the removal rate of algae was only 2.16%. The influences of the two kinds of natual organic matters on algae removal by coagulation process showed different rules: when the mass concentration of humic acid was higher than 10 mg/L, the removal rate of algae dropped sharply; when the mass concentration of fulvic acid was higher than 6 mg/L, the removal rate of algae began to decrease slowly.%试验研究了天然有机物(腐植酸、富里酸)对混凝除藻的影响,以及在含有天然有机物水体中混凝除藻的机理.结果表明,天然有机物会与藻细胞争夺絮凝剂,由于天然有机物与PAC亲和力强,PAC优先与天然有机物结合,再与藻细胞结合,当水体中天然有机物含量较多时,混凝除藻效果降低.当腐植酸质量浓度为20.2 mg/L时,藻去除率仅为2.16％.2种天然有机物对混凝除藻的影响也呈现不同的规律:腐植酸的质量浓度大于10mg/L时,藻去除率大幅下降;富里酸的质量浓度大于6mg/L时,藻去除率开始缓慢下降.
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