广州市区水系发达，在城区布满了汇入珠江的大小河涌16条，这些原本是泻洪和美化城市景观的重要河涌，如今由于城市的发展和污水处理的滞后，导致这些河涌都受到严重的污染，也导致珠江水的污染。作者在调查广州珠江河段及广州市河涌水质污染状况的基础上，在实验室模拟河涌建立了渠式混凝反应器，针对河涌污水的水质状况，对污水进行涌内处理的研究，结果表明，分段投加聚合氯化铝，渠式混凝沉淀，可以有效地改善城市污水。实验采取分段加药的方式，控制污水流速在42.2L/h，CODCr的去除率比一次加药提高15%，混凝后生成的絮体体积沉淀速度比一次加药提高近2倍。

Based on investigating the water pollution status in municipal sewage canals，anewcanal reactor of coagulation is designed in simulated canalsinthe laboratory.Adding drug swith canal coagulant precipitation can improve municipal sewage efficiently.The experimental results show when the drugs are added section ally and the flow speedis controlled at42.2L/h，the removal rate of COD_Cris increased by 15%than the drug sweread dedat one time.The volume of sewage flocculantis nearly doubled