Study On The Wastewater Treatment By Constructed Soil System With Artifical Aeration

Soil purification system because of low expenditure, without secondary pollution etc, increasingly become one of the hotspots of sewage disposal technical research. But at present soil purification system of sewage has disadvantage of large space,low hydraulic loading and so on. Therefore, these research originalitily bring up a kind of artificial reaeration constructed soil purification system. By contrasting removal rate in five different compound matrix, we fix the best compose of soil purification system,and then through artificial reaeration quantitative research confirms some kinds of working parameter's contribution on pollutant. At the same time, we in this reasearch preliminary discuss engineering application and removal mechanism of pollutant in the system.The research indicates that structure soil purification system using soil,dewatered sludge,cinder,attapulgite clay etc.as matrice. After system uniformity of operation,when the soil system match is 30% original soil, 15%attapulgite,15% cindery,the removal rate of COD,TP,NH3-N are higer.So we can assume that this matrices compose is the best matrices compose of the system.With soil purification effect research, the matrice containing 60% original soil and matrice contain 30% original soil, 15% attapulgite clay , 15% cindery system have high removal rate of COD,NH₃-N,TP.The average COD removal rate is high in two systems. One is 69.08%,the other is 72.26%.COD concentration of effluent is below 100mg/L. The removal rate of TP is in 92.00%～98.00%, TP concentration in effluent is in 0.05～0.3mg/L.The removal rate of NH₃-N is above 95%, concentration in effluent basically is less than 1 mg/L. COD clarification load and sewage organic load submit notable linear correlation.On artificial reaeration constructed soil stage,the purification effect has notability increased, when air quantity is in 1～4L/min,the best removal rate of COD is 90%.The system containing sludgy has higher removal rate of TP. With sludge quantitative increased, the removal rate of TP are 15%,20%,70%.Reaeration has less effect in the removal rate of TP than others; in this system different match of matrice has higer removal rate of NH₃-N. In this system, DO in enfluent are apparently higher than influent,then maintains better oxygenium state in soil and validity prevents swamp of system.Finally,with enginneering research artificial reaeration constructed system is a kind of simplie operation,convenience operational guidance,little consume,low invest and low operational guidance charges sewage disposal system.