A Study On The Variation Of Lechate In The Anareobic-Semiaerobic Bioreactor Landfill

Because of the municipal solid waste with high organic content, low calorific value, high moisture content, the sanitary landfill is one of the main ways of dealing the municipal solid waste in China. And the resulting leachate treatment is the main point to achieve sustainable development of the landfill. Anaerobic Bioreactor Landfills were studying more in the domestic and international scholars, but the problem of high ammonia nitrogen content of leachate could not be solved while the stabilization process of landfill were slower. To solve the problems, the anaerobic bioreactor landfill (ANBL) and semi-aerobic aged refuse biofilter (SAARB) were combined to devise an anaerobic-semiaerobic bioreactor landfill in this experiment. Through the laboratory simulations, the variations of leachate indicators were studying, and the degradation mechanism of leachate were preliminary studying in the anaerobic-semiaerobic bioreactor landfill.Studying respectively on the variations of leachate indicators in an anaerobic bioreactor landfill (ANBL) and an anaerobic-semiaerobic bioreactor landfill (AN-SABL), the results show that:Due to the different operation ways of the landfills, the variations of leachate indicators show the significant differences. In hydrolysis acidification phase, the leachate producation in the anaerobic-semiaerobic bioreactor landfill2#with1time per3days of the recirculation frequency was more than that in the anaerobic-semiaerobic bioreactor landfill3#with1time per1days of the recirculation frequency, and the concentration of leachate COD, TC, TOC, TN and NH4+-N had shown that the degradation rate of the anaerobic-semiaerobic bioreactor landfill were faster than the anaerobic bioreactor landfill, moreover, low recirculation frequency(1time per3days) was better for the waste degradation than high recirculation frequency(1time per1days); according to the leachate pH value and Eh value, the order of three reactor landfill into the methanogenic phase was in turn:the anaerobic-semiaerobic bioreactor landfill with1time per3days of the recirculation frequency、the anaerobic-semiaerobic bioreactor landfill with1time per1days of the recirculation frequency、the anaerobic bioreactor landfill; In the methane fermentation phase, the concentrations of leachate indications in the anaerobic bioreactor landfill were still the largest, and the degradation rate were slowest. Further, the COD concentration degradation rate in the anaerobic-semiaerobic bioreactor landfill3#(the recirculation frequency was1time per1days) was faster than the anaerobic-semiaerobic bioreactor landfill2#(the recirculation frequency was1time per3days); In the late experiments, due to the impact of leachate carbon source, microbial degradation rates in the semi-aerobic aged refuse biofilter were suppressed, so the removal efficiency of COD and TN decreased. In summary, the results show that, in hydrolysis acidification phase, the low recirculation frequency(1time per3days) was good for the waste degradation, on the contrast, in the methanogenic phase, the high recirculation frequency(1time per1days) was favorable for that...