Research On Test Of Domestic Sewage Treatment By Yellow Soil

China is short of water resource and water pollution is very severe in China.Sichuan is hard to construct wastewater treatment plant because of its own landform, its investment restriction and other reasons. But Sichuan has very abundant land resouce, and it is propitious to use land processing technology.Because yellow soil is Sichuan's zonal soil, the yellow soil is used as the-research object. Through simulating slow filtering land treatment system and finding the movement law, transportation law and degradation law of C, N, P in the wast water, the reaction dynamics equation is found out. Then in order to apply the system to practicality, slow filtering land treatment system is builded used yellow soil and under the climate condition of Sichuan, hoping to provide some data foundition to futher research.The results are as follows:when the system is stable, removal rates of CODcr, TN and TP are stable and high, they are about 83%,55% and 90% separately. The best hydraulic load of this system is 0.06m/d. Under this condition, the change of inlet pollutant concentration can influent the removal rate of N, P; but it can not influent the concentration of CODCr,TN. The removal rate of NH4+-N descends with the rise of inlet NH4+-N concentration. The removal rate of TP is always above 94%, no matter whether the inlet TP concentration rises. In all, shock resistance of the system is good.About 20-30cm,below the yellow soil surface,COD, NH4+-N have been almost removed. In the bottom, the removal rate of TN is the highest. The removal rate of TP varies directly with the deepth of yellow soil. About 50cm, below the yellow soil surface, P can be removed totally. The yellow soil which has 50cm deepth can remove C, N, P effectively.The removement effect of COD by Reineckea carnea(Andr.)Kunth is obvious,and the removement effect of N, P by Reineckea carnea(Andr.)Kunth is obvious. 28.8% of removed N is in the body of Reineckea carnea(Andr.)Kunth 13.8% of removed P is in the body of Reineckea carnea(Andr.)Kunth.When hydraulic load is 0.06m/d, wet and dry ratio is 5:1, the system with yellow soil whose deepth is 50cm and Reineckea carnea(Andr.)Kunth has the best purifying capacity to purify the domestic sewage whose COD concentration is 300mg/L, the outlet concentration of COD, TN and TP reach the standard of GB. Through the simulating test and result analysis,it is good for other reseachers to use land treatment system effectively and it is very significant to develop land treatment technology to purify domestic sewage.