Analysis Of The Removal Rules Of Domestic Wastewater Pollutants By LM System And Establishment Of Empirical Model

As a newly introduced artificially enhanced sewage treatment technology,LM system?Living Machine systems?has an excellent application prospect in the domestic sewage recycling.This project select LM system to remove residential sewage.The experiment inspect the removal effect of the main pollutants by the stable operation of the LM system,and analyzed the removal rules of various pollutants along the processing unit.Through Response surface methodology,the effects of different HRT?hydraulic residence time?,aeration volume and aeration time on pollutant removal in LM system were determined.Finally,the predictive model of each factor and the empirical model of pollutant removal were established.The main results summarized as follows:?1?The LM system has high removal efficiency for CODcr,NH₃-N,TN and TP during stable operation.The average removal rates of various pollutants were 91.66%,95.66%,86.65%,and 91.62%,respectively.?2?The removal rate of pollutants in LM system is influenced by HRT,aeration volume and aeration time.The best factors for pollutant removal at different levels of HRT,aeration volume and aeration time are as follows:HRT for 6?15 h,aeration volume for 0.6?3.0 m³/h,and aeration time for 10?20 min.?3?Response surface methodology was used to analyze the interaction rules of HRT,aeration volume and aeration time on the removal of various pollutants,and the optimal conditions for the removal of domestic sewage pollutants in LM system were predicted to be HRT of 13 h,aeration volume of 2.4 m³/h and aeration time of 21 min per hour.?4?The linear correlation coefficient R² between the removal rates of COD_cr,NH₃-N,TN and TP in LM system and the predicted values of the empirical model and the actual values of different influencing factors were 0.921,0.898,0.906 and 0.865,respectively.