新型曝气自净式雨水桶设计与试验

Design and Experimental of a New Aeration Self-Purification Rain Barrel

针对雨水桶内的雨水放置时间过长后易出现黑臭现象的问题,结合初期弃流、周期曝气、活性炭过滤技术,在传统雨水桶的基础上设计了一种新型曝气自净式雨水桶,与传统雨水桶相比,新型雨水桶增加了桶内水体的流动性、提高了水体内的污染物去除及吸附的程度,采用南京市2017年9、10月的屋面雨水作为试验水样,通过周期对比试验分析传统雨水桶与新型曝气自净式雨水桶内雨水的水质状况。结果表明,相较于传统雨量桶,新型曝气自净式雨水桶浊度去除率提升87.4%、氨氮含量降低71.89%、BOD5减少70.1%、溶解氧增长47.82%、COD降低39.51%、pH值提高32.46%、总磷含量降低13.48%、总氮含量降低39.76%。

In view of the problem that the rainwater in the rainwater bucket is easy to appear black-odor after being placed for too long,combined with the technology of initial abandonment,periodic aeration and activated carbon filtration,this paper designed a new-type of self-cleaning aeration rainwater bucket on the basis of the traditional rainwater bucket.Compared with the traditional rain barrel,new rain barrel increased the mobility of water in barrel,improved the body’s water pollutant removal and the degree of adsorption.The roofing rainwater of Nanjing in September and October in 2017 was taken as experimental samples.The experiment cycle analysis was used to compare with the rain water quality in the traditional rain barrels and new-type aeration self-purification rain barrel.The results show that the turbidity removal rate of the new aerated self-purification rain bucket increased by 87.4%,ammonia nitrogen content decreased by71.89%,BOD5 decreased by 70.1%,dissolved oxygen increased by 47.82%,COD decreased by 39.51%,pH value increased by 32.46%,the total phosphorus content decreased by 13.48%,and the total nitrogen content decreased by39.76%.