旋流分离器在控制暴雨径流中的应用

为了改善镇江市水质环境,减少面源污染,在排水管网中安置水力旋流器,在梅雨季节进行现场试验.从产流后分时间间隔对进口和出口水质进行采样,检测总氮、总磷、SS、浊度、pH、COD这5个水质指标.经分析发现,污染物浓度峰值稍后于降雨量峰值,在产流后20 min内,ω（SS）从56.8 mg/L上升至203.9 mg/L,ω（COD）从69.2 mg/L上升至135.2 mg/L,浊度从49上升至128,管路中水体的水质在短时间内迅速恶化,但随着时间的延长,水质比较稳定且污染物较少.出口处ω（SS）平均为52.9 mg/L,ω（COD）平均为63.2 mg/L,浊度平均为45,对这3个指标的去除率高达75%.总氮在径流初期先下降,后略有上升.总磷改变幅度较小.氮磷去除率不高,但是出水也均达到排放标准.此水力旋流器可以较好地控制暴雨径流污染.

Application of hydrocyclone separator to pollution control in storm runoff

In order to control the non-point pollution and to improve the water quality environment of Zhenjiang, a hydrocyclone separator was installed in the underwater net to make spot experiment in the raining days. Water samples were taken in different time intervals and runoff yield. Five indexes, total nitrogen, total phosphorus, SS, turbidity, pH, and COD, were measured. By analysis, the peak of the concentration appeared later than that of the rainfall quantity. 20 minutes after runoff yield, the ω （SS） rised from 56.8 mg/L to 203.9 mg/L, ω（COD） rised from 69.2 mg/L to 135.2 mg/L, and turbidity rised from 49 to 128. The water quality in the pipeline worsened rapidly within short time. But with the extension of time, water quality was basically stabilized and there was less pollutant. The SS at the outlet was 52.9 mg/L, ω（ COD）was 63.2 mg/L , turbidity was 45 mg/L in average, and removal rate was up to 75% for these three indexes. TN droped in initial stage of the surface flow and then slightly rised. The change range of TP was relatively small. Though the removing rate of TN and TP was not high, they could meet the discharge standard. This kind of hydrocyclone separator performs well in controlling the pollution in storm runoff.