Study on the Landfill Density of Semi-aerobic Aged Refuse Bioreactor

[Objective]The research aimed to study the effects of landfill density of semi-aerobic aged refuse bioreactor on the leachate treatment.[Method]Semi-aerobic aged refuse bioreactors were set up in the laboratory.And the effects of landfill density of semi-aerobic aged refuse bioreactor on the leachate were compared by the determination of COD,NH3-N and TN.[Result]The results showed that at a hydraulic load of about 45 L/d and an organic load of about 540 g/d for per cubic aged refuse,removal efficiency of COD,NH3-N and TN was up 86%,92% and 88% respectively.When landfill density reduced from 1 426 kg/m3 to 858 kg/m3,removal efficiency of the COD,NH3-N and TN was increased to near 99%,100% and 96%respectively.The increase was attributed to extension of leachate retention time and improvement of natural ventilation conditions in the bioreactor with the least density.Based on analysis of the efficiency and the effects on leachate treatment,the fit landfill density was preliminarily considered to be near 860 kg/m3.[Conclusion]This study could give quantitative guidance for establishment and application of the bioreactor.