不同HRT条件下生态塘与人工湿地复合系统对受污染河水中TP的处理效果

Total Phosphorus Removal of Polluted River Water by Ecological Pond and Constructed Wetland Compound System under Different Hydraulic Retention Time

通过中试规模的生态塘1(EP1)-水平潜流人工湿地(HSFCW)-生态塘2(EP2)复合系统,在不同HRT(3,2,1 d)条件下对昆明市新运粮河水中总磷(TP)的去除效果进行研究。结果表明,复合系统在HRT为3,2,1 d的条件下,对TP去除率分别为82.20%、57.32%、34.45%,处理出水质量浓度分别为0.31,0.78,0.86 mg/L,均达到城镇污水处理厂污染物排放标准一级标准(GB18918—2002)。系统对河水中TP的处理效果总体上随着HRT的延长而提高。在较长的HRT(3,2 d)条件下,人工湿地对TP的去除率要高于生态塘,在较短的HRT(1 d)条件下,生态塘对TP的去除率要高于人工湿地。在不同HRT条件下,生态塘对河水中TP的处理效果的稳定性要高于人工湿地。

A pilot scale of ecological pond1-horizontal subsurface flow constructed wetland-ecological pond2(EP1-HSFCW-EP2)is built to treat the total phosphorus(TP)removal of Xinyunliang river water in Kunming city,and this compound system is operated under three different hydraulic retention time(HRT)as 3 d,2 d and 1 d.The research indicates that:when hybrid system operates under HRT as 3 d,2 d and 1 d,the removal rate of TP is 82.20%,57.32%and 34.45%respectively,and the concentration after treatment of TP is 0.31 mg/L,0.78 mg/L and 0.86 mg/L respectively,which achieve the first class discharge standard of urban sewage treatment factory(GB18918—2002).The system’s treatment effect is reduced with the shortening of the HRT.Under the condition of long HRT(3 d,2 d),the removal rate of TP in constructed wetland is higher than that in ecological pond.Under the short HRT(1 d)condition,the removal rate of TP in the ecological pond is higher than that in constructed wetland.Under different HRT conditions,the treatment effect of TP in ecological pond is more stable than that in constructed wetland.