城市滞流河道黑臭发生及控制研究

为了研究常州市老城区典型河道—北市河的黑臭现象发生原因,采用自主研发的一套滞流型河道沉积物污染释放与抑制装置,通过综合黑臭指数分析表明黑臭现象的发生耗时很长,由此推断导致水体黑臭发生的主要原因是外源污染物的排入。此外还从曝气深度和净化剂2个方面出发,研究其对黑臭的控制作用。在实验装置中选定距表面50 cm、100 cm、150 cm 3个深度,采用间歇纯氧曝气方式对水体进行处理,水质变化情况表明采用100 cm深度进行曝气对水体黑臭的控制效果最好。在净化剂比选实验中,在实验柱中分别投加商品钝化剂、过氧化氢、过氧化钙,并设置空白对照实验,监测水质参数随时间的变化情况,采用层次分析法进行净化剂的优选,分析结果表明过氧化钙的净化效果最好。

Occurrence and Control of Black-odor in Urban Low-flowed River

To study the phenomenon of black-odor in Beishi River,a typical river in Changzhou urban area,an independently developed device of contamination release and inhibition about low-flowed river sediments was used,and analysis of comprehensive black-odor index indicated that the occurrence of black-odor took a long time,therefore inferred the main cause of the phenomenon was the discharging of ergogenic pollutants.Aeration depth and purifying agents were selected to study the control of black-odor.Three depths of 50 cm,100 cm and 150 cm from surface were chosen,and the water was treated using intermittent pure oxygen aeration,and the change of water quality showed that the depth of 100 cm had the best effects in controlling black-odor.On the experiments of selecting purifying agents,commodity passivation agent,hydrogen peroxide and calcium peroxide were respectively added into experiment columns,a blank test was also set,and then the change of water quality were monitored.Analysis of analytic hierarchy process showed that the best purification was calcium peroxide.