The performance of an anaerobic bioreactor in treating mechanically biologically treated municipal solid waste was investigated using experimental and modelling techniques. The key parameters measured during the experimental test period included the gas yield, leachate generation and settlement under applied load. Modelling of the anaerobic bioreactor was carried out using the University of Southampton landfill degradation and transport model. The model was used to simulate the actual gas production and settlement. A sensitivity analysis showed that the most influential model parameters are the monod growth rate and moisture. In this case, pH had no effect on the total gas production and waste settlement, and only a small variation in the gas production was observed when the heat transfer coefficient of waste was varied from 20 to 100 kJ/(m d K). The anaerobic bioreactor contained 1.9 kg (dry) of mechanically biologically treated waste producing 10 L of landfill gas over 125 days.
The study aims to investigate the application of anaerobic (AN), aerobic (AER) and semi-aerobic (SA) laboratory scale landfill bioreactors for stabilization of mechanically and biologically treated (MBT) waste of Bangalore city. All major parameters pertaining to the waste, leachate and biogas are continuously monitored during the experiment. Carbon (C) and nitrogen (N) mass balance are carried out to understand the recovery/removal of C and N from the system. The biochemical oxygen demand, chemical oxygen demand and nitrogen removal efficiency of the bioreactors are in the range of 83%–87%, 81%–87% and 96%–99%, respectively. Total settlement observed in the AN, AER and SA bioreactors is 15.25%, 23.92% and 10.80%, respectively. The performance of the three bioreactors are compared, and their suitability in treating the MBT waste from Bangalore city is discussed. The study shows that the AER bioreactor landfills can be used for remediating the existing municipal solid waste dumpsites in Bangalore city.
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