复合式渗流试验装置对微污染河道水的脱氮除磷研究

针对微污染河道水体的水质特点,考察了复合式渗流试验装置对此类河道水的处理效能。试验结果表明:在10 cm/d和20 cm/d水力负荷条件下,两个阶段TN的平均去除率分别为36.34%、28.53%;TN平均出水浓度分别为6.15,12.45 mg/L;TP的平均去除率分别为90.86%、64.15%;TP平均出水浓度分别为0.05,0.42 mg/L。氮的去除主要发生在前两个格室,前两个格室填充的腐木作为补充碳源,有利于微生物的反硝化脱氮作用;磷的去除主要发生在后两个格室,原因是后两个格室填充了水泥砖块,水泥砖块对磷具有较好的吸附性能,但随着时间的推移,系统的除磷能力会因填料对磷的吸附饱和而逐渐下降,故需要及时更换填料。

STUDY ON TREATMENT OF MICRO-POLLUTED RIVER WATER BY THE COMPOSITE FLOW TEST APPARATUS

Based on the quality characteristics of micro-polluted river water，this study investigated treatment performance by using the composite flow test． The results showed that: Under the hydraulic loading conditions of 10 cm/d and 20 cm/d，the average removal rates of TN in two phases were 36. 34%，28. 53%，respectively; average effluent concentrations of TN were 6. 15 mg /L，12. 45 mg /L; the average removal rates of TP were 90. 86%， 64. 15%; average effluent concentrations of TP were 0. 05 mg /L，0. 42 mg /L． Nitrogen was mainly removed in the first and second zone， and the two parts were filled with rotten wood and zeolites as external carbon source for denitrification process． Phosphorus was removed during the third and fourth zone， the two zones were filled with cement bricks． The cements bricks had a better adorption performance of the low concentration phosphorus，but as time went on，phosphorus removal capacity of the system decreased due to saturated filler，so the reactor need change the filler timely．