地下渗滤污水处理系统的氮磷去除机理

Nitrogen and phosphorus removal mechanism in subsurface wastewater infiltration system.

对地下渗滤系统处理生活污水的氮磷去除机理进行了研究.结果表明,在2cm/d的水力负荷下,系统对氨氮、COD、总磷的去除率可达到90%以上;出水中氨氮、COD、总磷分别低于0.2,30,0.025mg/L;系统对总氮亦有良好的去除效果,达63.5%.强化布水措施可以有效地提高系统对污染物质的去除率.地下渗滤系统中通过硝化、反硝化作用可以去除约50%的进水总氮,是地下渗滤系统去除氮的主要途径.改善条件以促进反硝化反应是提高地下渗滤系统总氮去除率的关键.土壤吸附与沉淀作用是地下渗滤系统去除磷的主要途径.

Nitrogen and phosphorus removal mechanism in subsurface wastewater infiltration system treating domestic wastewater was studied. The hydraulic loading was 2 cm/d. The experimental results showed that the removal rates of NH4+-N, COD and total phosphorus were all over 90%. The effluent concentrations of NH4+-N, COD and totalphosphorus below 0.2, 30 and 0.025 mg/L respectively. The total nitrogen removal rate was achieved as 63.5%. The removal efficiency of contaminants could be improved through strengthening equalization of flow distribution. Biological nitrogen removal through nitrification and denitrification was the main removal mechanism of nitrogen, which could remove about 50% of influent total nitrogen. How to improve denitrification process was the key to enhance nitrogen removal rate. Phosphorus in sewage was mainly removed by fixation processed in the soil, such as adsorption andchemical precipitation.