Study On Treatment Of The Landfill Leachate

The quality characteristics of the leachates from municipal landfills was determined through the analysis of the production process of leachates in landfills in this paper .It was concluded that there are large differences in quality and treatment is the continuation and intensified of the purification in landfills. The difficulty of leachate treatment is not only the organic pollutants of high concentration in the early leachate, but also the high ammonium concentration and low C/N ratio of the old leachates.In order to treat the landfill leachate, recent years, people found aerobic denitrification, Anaerobic Ammonium Oxidation (ANAMMOX) and nitrification/denitrification via nitrite. In the process of aerobic denitrification, there are enough carbon resources for denitrification. In the process of ANAMMOX, ammonium is converted to nitrogen gas under anoxic conditions with nitrite as the electron acceptor. Nitrification/denitrification via nitrite can save lots of carbon resources and energy. But, to our regret, these new ways65need high investment and further research on the appliance.In the first part of our test, the feasibility of united treatment of SBR and anaerobic landfill is discussed. We find that, nitrification in the SBR will be destroyed when the COD load is higher than 0.91 kg/m3/d. We also find that a lot of ammonium is tripped in the SBR.In the second part, the anaerobic landfill test is built only. Through above research, we put forward the mathematical model of the concentration of ammonium in the landfill leachate of stable landfills under recirculating. The function is seen in the next page. We found that the relationship between the temperature and the concentration of ammonium was quadritic after the municipal anaerobic landfills were stable. The best function is: Y= 1.3811 X2 + 2.2964 X + 639.39 and the correlation-R2 is 0.9185.In the third part of our test, the feasibility of united treatment of continuous aerobic reactor and anaerobic landfill is discussed. The influent of the reactor is mixtures of new and old landfill leachate. In this way, the degradability is improved. When the rate between new and old landfill leachate is 2:3, influent COD and ammonium are664987.36 mg/L and 493.54 mg/L, the volume loads of influent COD and ammonium are 1.54kg/ m3/d and 0.4kg/ m3/d, the effluent concentrations of COD and ammonium are 357.57mg/L and 135.67 mg/L. The removal rates of COD and ammonium are 92.83% and 72.51%, respectively.At the same time, we also find that when the volume load is 1.2g/m3, the 99% of the NOX-N is removed in the anaerobic landfill.