Experimental Study On Improving The Treatment Of Rural Domestic Sewage By Biofilter

In recent years,the construction and modernization of beautiful rural infrastructure have brought about great changes in rural areas.At the same time of the rapid development of the rural economy,the pollution of rural domestic sewage has caused the problem of rural ecological environment to become increasingly serious.At the same time,due to lack of environmental awareness and lack of environmental protection facilities,the ecological water environment has also been seriously damaged,which has seriously affected the lives of rural residents.Due to its centralized treatment,mature urban sewage treatment technology is not suitable for the dispersion of rural sewage and large changes in water volume,and cannot be directly applied.Promoting the comprehensive development of beautiful rural construction makes it urgent to find a sewage treatment technology that is more suitable for the actual situation in rural areas.In this study,rural domestic sewage was treated as the object of treatment,and the experimental research on rural domestic sewage treatment was carried out using the ventilated biofilter simulation device using fly ash ceramsite as filter material.The removal effect of the device on various pollutants in rural domestic sewage was investigated.Explore the best operating parameters of this method to treat rural domestic sewage in Hebei.This study can be divided into three parts:The first part is the study on the membrane starting of ceramsite biofilter.It takes about 30 days to use the natural film hanging method.During membrane hanging,the removal rate of pollutants such as COD,NH₄⁺-N,TP and turbidity in the filter can be detected to determine whether the filter is successfully hung.At the later stage of membrane hanging,the removal effect of COD,NH₄⁺-N,TP and turbidity gradually stabilized,and all reached the standard of irrigation water quality for farmland?GB 5084-2005?.The results showed that the membrane of ceramsite biofilter was successfully suspended.The biofilter can be restarted after being idle for a short period of time,but the removal effect can still be guaranteed and the stable operation can be resumed quickly.The second part is the study on the optimal operation condition of ceramsite biofilter.The effects of hydraulic load,reflux ratio,ventilation pipe height difference and other factors on the treatment effect of improved biofilter were investigated.According to the test results,when hydraulic load,reflux ratio and ventilation pipe height difference are the optimal operating conditions,the removal effects of COD,NH₄⁺-N and TP are all good,and the detected effluent quality indexes all reach the standard for irrigation water quality of farmland?GB 5084-2005?.Based on one-way anova of SPSS system,the experiment analyzed the influence of ventilation pipe height difference on COD removal rate,and the results showed that the influence was significant.The test results of the height differences of different ventilation pipes are analyzed by using SPSS Curve Estimation and the regression equations are synthesized.The third part is the kinetic model study of the treatment of rural domestic sewage by ceramsite biofilter.The Monod equation and the Eckenfelder equation in the matrix degradation kinetics can better fit the removal effect and characteristics of the activated sludge method.Among them,the Eckenfelder equation is more suitable for the dynamic analysis of biofilters.According to the analysis,the Eckenfelder kinetic model describes the removal effect of ceramsite biofilter on COD,NH₄⁺-N and TP,and the correlation coefficient is greater than 0.80,indicating that the kinetic equation obtained by Eckenfelder model can better fit the ceramsite pair.Removal process of COD,NH₄⁺-N,TP.