砾石人工湿地处理小区雨水径流的试验研究

Treatment of Rainfall Runoff in Green Building Community by Gravel Constructed Wetland

利用天然地势坡度开发了一种用于处理绿色建筑小区雨水径流的砾石人工湿地系统,并在深圳市进行了中试研究。结果表明:当雨水径流的SS、TN、NH_3-N、NO_3^--N和TP浓度分别为26.38~432.33、1.23~5.33、0.54~1.36、0.28~3.52、0.06~0.46 mg/L时,砾石湿地系统对其净化效果较好,出水浓度分别为6.22~9.21、0.63~3.16、0.11~0.30、0.11~2.81、0.07~0.11mg/L,各项指标都满足《城市污水再生利用景观环境用水水质》(GB/T 18921—2002)的要求。当进水COD浓度为15.21~53.38 mg/L时,出水浓度为4.25~9.97 mg/L,满足《建筑与小区雨水利用工程技术规范》(GB 50400—2006)中观赏性水景用水水质的要求。但当雨水径流的COD和TP浓度较高,分别为112.50~187.35、0.93~1.57 mg/L时,系统出水浓度分别为60.53~75.95、0.61~0.95 mg/L,不能满足上述标准的要求,因此建议在砾石湿地系统前增加预处理设施,如植被浅沟缓冲带等。

A gravel constructed wetland system was developed for the treatment of rainfall runoff in green building community with the natural slope gradient, and the pilot test was carried out in Shenzhen. Results showed that ： when the influent SS, TN, NH3 - N, NO3- - N and TP concentrations were 26.38 - 432.33 mg/L, 1.23 - 5.33 rag/L, 0.54 - 1.36 rag/L, 0.28 - 3.52 mg/L and 0.06 - 0.46 mg/L respectively, the system showed the better water quality purification effect as the effluent concentrations were 6.22 -9.21 mg/L, 0.63 -3.16 rag/L, 0.11 -0.30 mg/L, 0.11 -2.81 mg/L and 0.07 -0.11 mg/L respectively, meeting the standard of Reuse of Urban Recycling Water-Water Quality Standard for Scenic Environment Use （GB/T 18921 -2002 ）. When the influent COD eoneentration was 15.21 -53.38 mg/L, the effluent concentration was 4.25 - 9.97 mg/L, meeting the standard of Engineering Technical Code for Rain Utilization in Building and Sub-district （GB 50400 -2006 ）. However, when the influent TP and COD were at higher concentrations of 112.50 - 187.35 mg/L and 0.93 - 1.57mg/L, the effluent concentrations were 60.53 - 75.95 mg/L and 0.61 - 0.95 mg/L, which could not meet the water quality standard above. Therefore, it was advised that a pretreatment equipment was necessary to be added to the system such as the buffer zone of