Study On Sewage Treatment With Sandy Soil

Paper based on the basic requirements of land treatment systems, constructed with sand to fill the soil-plant processing equipment,By examining the device operating performance, determine the best conditions of reaction control, and to study the related control parameters on the removal of pollutants;And monitoring the water quality of effluent at different depths, exploring the transformation rules and removal mechanism of pollutant to provide the theoretical basis and technical support for the treatment of dispersion wastewater; By comparing blank and plant equipment test, analysising the sewage purification ability of plants in soil-plant system.In the hydraulic loading experiment,we research the performance of the system under the refered four hydraulic loading when the D/W ration is 3:1,the results indicate that the 0.08 m3/m2.d is the optimal hydraulic loading andthe effluent concentration of COD,TN,NH3-N,TP is 32.78mg/L,24.76 mg/L,3.58mg/L,1.70mg/L,the removal rate is 88.50%,28.31%,83.54%,48.01% respectively.When the hydraulic loading rises form 0.08 m3/m2.d to 0.10 m3/m2.d.d,hydraulic loading is contrary to the removal rate of COD and N,hydraulic loading has no relation to the removal of TP.In the mechanism experiment, we reseach the height transformation of the system.The results suggest that the COD and NH3-N of effluent at 50cm meet the A target requirements in "municipal wastewater treatment plant emission standards" (GB18918-2002),but TN and TP not. The surface 30cm contributes great for the pollutants removal,lots of ss,COD and the other pollutants assemble in the surface,as a result,the surface soil is easily clogged.In comparison experiment, mainly on the purification of sewage of Pink Reineckia, results indicate that:the COD removal rate is 7.58% which is 8.56% of the total removal rate;TN removal rate is 2.8% which is 9.89% of the total removal rate; TP removal rate is 2.42% which is 5.04% of total removal rate. In comparison, Pink Reineckia on the TN removal efficiency than the COD, TP is better.When the D/W ratio is 3:1 and The hydraulic loading is 0.08 m3/m2.d the plant equipment can reach a good condition.the effluent concentration of COD, NH3-N meet the A target requirements in "municipal wastewater treatment plant emission standards" (GB18918-2002),but TN and TP are exceeded.The experiment indicate that the soil-plant system has a high ability of removal of organisms.The advantage of the system is smaller land area,low operating cost and convenient management.So it is convenient for small towns water treatment technology, but the removal Mechanism of nitrogen and phosphorus to be further explored to enhance the nitrogen and phosphorus processing of installation.