Leachate Characteristics Of Different Types Of Bioreactor Landfill

With the development of our social economy, the speeding up of urbanization, people’s living standards improved, but the resulting is also in the rapid growth of urban living garbage emissions, waste treatment and disposal to become a major environmental problem in China. Even now, in the past dozens of years sanitary landfill is still the main mode of living garbage disposal in China. For traditional sanitary landfill, isolates garbage with the external environment, thus reducing pollutants and emissions is the dominant idea, this way of operating the landfill in various reactions are completely out of control state, managers can only passive measures for operation and management of landfill site. This topic with aerobic respectively, aerobic and anaerobic landfill structure, through the same frequency, simulated rainfall recharge based on comprehensive analysis of the experimental system of liquid index, the in-situ injection under different types of water quality characteristics of leachate in bioreactor landfill were studied.The results show that compared with the aerobic type and quasi aerobic landfill, type anaerobic bioreactor landfill waste decomposition rate is relatively slow, the concentration of the organic pollutants in landfill leachate will maintain at a high level for a long time, at the same time with high ammonia nitrogen, but the concentration of chloride ions and some heavy metal ions will be late to very low levels.Aerobic type bioreactor landfill site adopting dynamic oxygen, garbage aerobic decomposition, decomposition rate is fast, the concentration of the organic pollutants in landfill leachate are falling fast, COD removal rate reached 97.3%, the concentration of ammonia nitrogen is low, the removal rate of 99.9%, but the concentrations of heavy metals and nitrate ions, and the concentration of carbonate ions will be high for a long time.Quasi aerobic bioreactor landfill, the natural ventilation, makes waste in the body at the same time there are aerobic, anaerobic and oxygen area, the pollution characteristics of leachate and the change trend between aerobic and anaerobic landfill site landfill site, the early leachate organic pollution concentration is high, but the downward trend is very obvious, and VFA removal rate reached 99.2%, COD removal rate reached 98.3%. Type and quasi aerobic bioreactor landfill can more quickly into the leachate organic pollutants concentration in the stage of rapid decline, especially ammonia nitrogen removal effect is remarkable, at 99.9%.