改良型人工快渗系统脱氮除磷效果研究

Study on nitrogen and phosphorus removal effect of improved constructed rapid infiltration system

人工快渗(CRI)系统是一种广为人知的无动力生态处理技术措施,但传统CRI系统存在对氮、磷去除率普遍较低的问题。本研究采用海绵铁、沸石、火山岩、红壤土和杂沙作为填料,构建了一个改良型CRI系统,在水力负荷为1 m3/(m3·d)的条件下,以实际生活污水为试验进水,进行为期20天的试验。实验结果表明,该系统在运行16天后出水TP、TN和NH3-N浓度均趋于稳定,稳定后出水平均浓度分别为0.21 mg/L、8.38 mg/L和2.34 mg/L,能分别满足《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A排放标准的0.5 mg/L、15 mg/L和5 mg/L的限值。TP、TN和NH3-N三项指标的总平均去除率为84.44%,远高于传统CRI系统的44.06%总平均去除率。该研究成果为治理农村生活污水提供了一项行之有效的生态治理技术措施。

Constructed rapid infiltration(CRI) system is a well-known non-dynamic ecological treatment technique, but the removal rate of nitrogen and phosphorus is generally low in the traditional CRI system.In this study, sponge iron, zeolite, volcanic rock, red loam and mixed sand were used as fillers to construct an improved CRI system. Under the hydraulic load of 1 m3/(m3·d), the actual domestic sewage was used as the experimental inlet water for a period of 20 days. The experimental results show that the effluent TP,TN and NH3-N concentration tends to be stable after 16 days of operation,and the average effluent concentration is 0.21 mg/L,8.38 mg/L and 2.34 mg/L,respectively,which can meet the limits of 0.5 mg/L,15 mg/L and 5 mg/L of the "Discharge standard of pollutants for municipal wastewater treatment plant"(GB18918-2002). The total average removal rate of TP, TN and NH3-N is 84.44%, far higher than that of the traditional CRI system(44.06%). The results of this study provide an effective technical measure for ecological treatment of rural domestic sewage.