高效藻类塘处理太湖地区农村生活污水研究

Study on Taihu Rural Domestic Wastewater Treatment Performance in a High Rate Algal Pond System

对高效藻类塘处理太湖地区农村生活污水进行了试验研究,系统水力停留时间为夏季4 d、冬季8 d.结果表明:高效藻类塘出水化学需氧量(COD)的质量浓度受藻类生长影响较大,但出水溶解性COD的质量浓度比较稳定,平均去除率在70%以上.氨氮的去除效果好,平均去除率为93%,氨氮主要通过硝化、挥发和生物同化吸收三种途径去除.塘内磷主要通过沉淀去除,总磷平均去除率在50%左右.冬季水力停留时间的延长对保障系统的整体运行效果是有效的.高效藻类塘用来处理太湖地区农村生活污水具有一定的应用前景.

The performance of a high rate algal pond （HRAP） with the hydraulic retention time （HRT） of 4d in the hot season and 8d in the cold season is presented in this paper. The system was fed with domestic wastewater of Taihu Lake rural village. The results show that COl） concentration of effluent is influenced markedly by algal growth, but dissolved COD of effluent is comparatively steady. The average removal rate of dissolved COD, ammonia-N and total phosphorus were 70 %, 93 % and 50 %, respectively. The main removal mechanism of ammonia-N was nitrification, assimilation of algae and volatilization, and phosphorus removal was mainly depended on precipitation. The results also show that long HRT is very useful during the cold season and the HRAP is effective in treating Taihu Lake rural domestic wastewater.