摘要
对南京城区屋面雨水径流及某住宅小区的雨水调节池水质做了分析测定,发现屋面初期径流污染很严重,最大值能够达到CODcr290.08 mg/L,NH3+-N5.47μg/L,浊度220.5NTU。采用混凝-砂滤工艺对调节池雨水进行了中试规模的试验研究,结果表明选用硫酸铝作为混凝剂时,其最佳投加量为25 mg/L,此时CODcr的去除率为85.14%,浊度的去除率为88.79%,TP的去除率为63.18%。后续选用0.5 mm粒径石英砂过滤混凝沉淀后水,处理后出水水质均值分别为浊度7.5 NTU,TP 0.07 mg/L,NH3+-N3.68 mg/L,CODcr27.04 mg/L,水质满足《城市污水再生利用城市杂用水水质》(GB/T18920-2002)、《城市污水再生利用景观环境用水水质》(GB/T18921-2002)的水质要求。
Rain runoff water quality was monitored and analysed, detect that the pollution of the first flash of runoff is very se- rious. Coagulatory - sand filtration process was used to purify the rainwater in a pilot - scale. The experimental results show that when the concentration of coagulant Al2 （SO4）3 · 18H2O is 25 μg/L, the removal rate of CODer, turbidity, TP is 85. 14 % , 88. 79 %, 63. 18 % respectively. Then the water is treated with sand -filtration of 0. 5 mm and the quality parameter of treated water is turbidity 7. 5 NTU, TP O. 0722 μg/L, NH3^＋ - N 3. 678 μg/L, CODCr 27.04 μg/L respectively. The end effluent quality can reach national standards of the reuse of urban recycling water. Water quality standard for urban miscellaneous water consumpfiontion（GB/T 18920-2002 ） and the reuse of urban recycling water---Water quality standard for scenic environment use （GB/ T18921 -2002）.
出处
《环境科学与管理》
CAS
2008年第5期125-127,共3页
Environmental Science and Management
关键词
初期径流
雨水利用
混凝
砂滤
earlier runoff
rainwater utilization
eoagulatory
sand - filtration
