基质混配地下渗滤系统脱氮除磷机理研究

Nitrogen and Phosphorus Removal Mechanism of Matrix Mixed in Subsurface Infiltration System

为更好地去除生活污水中的氮、磷元素,将腐熟牛粪、粉煤灰与土壤混配,设置分层装填(系统1)和混合装填(系统2)2种渗滤系统模拟农村生活污水净化研究。结果表明,2个系统出水TP含量均能达到GB 3838-2002的Ⅲ类限值,单因素方差分析,2个处理系统差异性极显著(P<0.01)。系统1和系统2对TN平均去除率分别为75.1%和71.3%;2个系统对NO_3--N的净化效果差异显著,系统1、系统2出水NO_3--N的质量浓度平均分别为3.11、4.94 mg/L,但均能达到GB 3838-2002的III类。综合考虑,腐熟牛粪与粉煤灰混配,能够提高系统的脱氮除磷能力,且分层装填净化性能要优于混合装填。

In order to remove nitrogen and phosphorus in domestic sewage in a better way, the composting manure and fly ash were mixed with the soil, and two kinds of SWIS were set, i,e. the layered filling （system 1） and mixed loading （system 2）. The results showed that the indices of total phosphorus could reach the class III of the Gi3 3838--2002 for both systems. Single factor analysis of variance showed that there were extremely significant differences between the two treatments （P 〈 0.0l）. In system 1 the average removal rate of total nitrogen was 75.1%, while that in system 2 was 71.3%. The purification effect of nitrate nitrogen was significantly different by the two treatments. In system 1 the average mass concentrations of nitrate nitrogen was 3.11 mg/L, while that in system 2 was 4,94 mg/L. However, these two systems could achieve class III of the GB 3838--2002. With overall consideration, the removal ability of nitrogen and phosphorus could be improved by rotten cow dung mixed with fly ash, and the layered filling was better than mixed loading.