节水是我国现阶段大力提倡的国策，水资源的短缺和水体污染已经严重制约了我国社会的可持续发展，而中水回用则是有效解决水资源利用的重要途径之一，并能提高污水的处理效率。本文针对分散型建筑小区污水状况及杂用水的要求，提出将处理达标后污水作为小区的中水回用，是一种典型中水利用的好方法。而在特殊的小区环境中，采用土壤渗滤法工艺可以充分利用土壤中的动物、植物、微生物及土壤的物理、化学性质，从而对污水进行就地的处理，因此它与建筑小区的中水处理系统具有良好的结合性，宜于推广应用。 本课题基于土壤渗滤法的生态原理基础上，加入现代的厌氧、好氧的污水处理技术，对建筑小区的生活污水利用进行试验研究。试验中主要对污水中的化学需氧量(COD)、五日生化需氧量(BOD5)、总氮(TN)、总磷(TP)变化进行了观察和相关数据测试。当土壤渗滤系统启动调试达到熟化稳定的程度后，实验结果表明，出水均能够满足中水水质要求，COD的平均去除效率为82.3%，BOD5的平均去除率可达80%以上。而TN的去除效果没有前两者好，究其原因主要是因为系统中硝化比反硝化进行得好，造成总氮主要是以硝态氮的形式存在的。事实上土壤渗滤法更擅长去除氨态氮，为了进一步确定其氨态氮的去除率，在保证进出水量平衡的前提下，通过利用COD的变化趋势来重新确立了系统对氨态氮的去除效果，去除结果为94.1%。另外TP的平均去除率可以达到85%以上，从而也证明了该系统不仅对有机污染物具有很强的去除能力，同时也有较好的抗冲击能力。在此基础上，还运用水环境虚拟设备(WEEfz_3.2)对水质中固体悬浮物(SS)的去除效率进行了模拟。 最后，本文以湖州某区的土壤渗滤系统的污水处理回用工程为例，对解决了预处理效率低以及堵塞问题后，污水在处理中受水土势和重力的合力由渗滤沟向沟间土壤浸润扩散，经过土壤一系列的新陈代谢以及酶的作用，同时还受到植物对原水中一些有毒物质的脱毒作用，通过吸收作用、光合作用和蒸腾作用对有机物进行转化、固定、区隔富集、络合、硝化、反硝化后，工程表明了各项中水出水水质指标均达到国家回用标准，从而再次证明土壤渗滤系统值得在今后中水回用中推广，并有着十分广阔的应用前景。

Water saving work is strongly advocated national policy at the present stage in China's , and the shortage of water resources and water pollution has seriously restricted the sustainable development of the society, water reuse is one of the important ways to effectively use water resources and improve the efficiency of wastewater treatment. Aiming at requirements of distributed building plot sewage condition and miscellaneous water, Put forward a well way to typical water that use the sewage after treatment to standard as water reuse of the village. In particular the residential environment, soil aquifer treatment is a method that making full use of animals, plants, microorganisms in the soil and soil physical and chemical, thus treatment sewage on-site, therefore it has a good combination with water treatment of building village and suit to popularizable application. This topic aims to the experimental study of construction sewage based on the soil infiltration method ecological principles, and combine into modern anaerobic and aerobic sewage treatment technology.The experiment mainly observe and test the chemical oxygen demand (COD), five days biochemical oxygen demandment (BOD5) , total nitrogen (TN), total phosphorus (TP) in the sewage, when the system get the degree of maturation stability, judging from the results, the effluent can meet the water quality requirements, the average removal efficiency of COD is 82.3%, the average removal rate of BOD5 can reach more than 80%, TN removal efficiency is not better than the first and two, the mainly reason is nitrification better than denitrification in the system, resulting in total nitrogen mainly exist with the form of nitrate nitrogen.In factly soil aquifer treatment is more effective removal ammonia nitrogen, in order to determine its ammonia nitrogen remove rate furtherly under the premise of guarantee the in and out of the water balance, by using the change trend of COD to determine the efficiency of ammonia nitrogen again, the results show that the removal rate up to 94.1%. the average removal rate of TP is above 85%. Thus prove the treatment system not only has a strong ability to removal for organic pollutants, but also has good impact resistance. Based on this also use the virtual equipment (WEEfz_3.2) of water environment simulation of water quality of solid suspended solids (SS) removal rate. At the end, this paper take the sewage reuse project of huzhou district soil infiltration system as an example, sewage infiltrate and spread toward gap between the soil by join forces of water and soil power and gravity force after solved the low efficiency in the pretreatment and congestion, with a serise of metabolism and enzymes of the soil as well as some toxic substances in raw water by plants of detoxification, after through absorption, photosynthesis and transpiration of organic matter transformation, fixed, enrichment of segments, complexation, nitrification, denitrification the effluent water quality indicators meet the national recycling standards, and once again proved that the soil infiltration system is worth popularizing in the water reuse in the future and has a very borad application prospects.