砂柱对济南城市屋面雨水径流净化效果的试验

针对屋面雨水回灌裂隙岩溶含水层要求快速量大和水质要求高的特点,设计了相适宜的砂滤柱.采用室内砂滤试验研究了济南市屋面雨水径流回灌裂隙岩溶含水层之前的雨水净化效果.结果表明,砂柱对屋面雨水径流污染物有明显的去除效果,浊度的平均去除率达到87%,悬浮物的平均去除率达到70%以上,对色度、挥发酚、Pb和Zn也有一定的去除效果,对NH3-N、NO2-N的去除效果较差.浊度、色度和悬浮物等大部分污染物的去除主要集中在上层完成,因此,砂柱的上层需要定期更换.

Purification of roof rainwater in Jinan by sand fileration column

To fulfill the requirements of high speed,large volume and high water quality for roof rainwater recharging fracture-karst aquifer,sand filtration column was designed.Sand filtration test in the laboratory was conducted to investigate the effect of roof rainwater purification in Jinan as pretreatment for fracture-karst aquifer recharge.The results show that the sand filtration column is effective in removing pollutants in roof rainwater.The average removal rate of turbidity reached 87%,and the average removal rate of suspended solids was above 70%;The sand column was also effective in removing color,volatile phenol,lead and zinc to a certain degree.However,it had a poor effect in removing ammonia nitrogen and nitrite nitrogen.In addition,the removal of most pollutants such as turbidity,color and suspended solids mainly occurred in the upper layer,which needs to be replaced regularly.