Effects of Aerobic Bioreactor Landfill Technology on Leachate Treatment and MSW Stabilization

Anaerobic bioreactor landfill technology would result in long time of acidogenesis phase and accumulation of ammonia nitrogen in leachate. To solve the problems, 4 simulated bioreactors were built up, including an anaerobic bioreactor(C1) and 3 aerobic bioreactors(C2, C3, C4) with aeration on the upper layer. All the bioreactors were recirculated with leachate every day, and aeration intensity for C2, C3 and C4 were 2 h/d, 4h/d and 8h/d respectively. Results showed that organic matters in leachate from all aerobic bioreactors decreased quickly over time. At the end of experiment, COD and BOD5in leachate from C2, C3, C4 were all reduced above 90%. Increasing aeration time could accelerate the degradation of nitrogen compounds significantly. In the end, concentrations of NH3-N in leachate from C3 and C4 decreased to 99 mg/L and 39mg/L respectively. Waste settlements of 7.1%, 8.6%, 17.1% and 21.4% were observed in C1, C2, C3, C4, indicating faster stabilization and more space saved under longer aeration time.