Leachate treatment using a sequencing batch reactor

Background and Objectives: The objective of this paper is to investigate the COD removal efficiency of the Kermanshah landfill leachate by applying the aerobic sequencing batch reactor (ASBR). Martials and Methods: The ASBR was operated to investigate the COD removal efficiency at the various HRT and COD concentrations. In order to study the effects of COD concentration and HRT based on response surface methodology at three-level, two-variable central composite design (CCD) of experiments was used. Results: The results showed that the leachate could be effectively treated with 90% of COD removal at the lowest COD concentration (16000mg/L) in influent. The removal efficiency decreased gradually down to 30.9% when COD increased to 48000 mg/L. The system has strong tolerance to organic shock loading in this experiment. The five suggested models based on the mentioned variables were applied to predict the response values. Conclusion: The value of the HRT as important variables showed that efficiency of reactor decreased from 70% to 50%, when the HRT decreased from 6 to 2 days. This study contributed to a better understanding of the function of HRT and COD concentration in system.

Keywords:

Landfill leachate , Kermanshah , Aerobic treatment , SBR reactor , CCD