Performance of Anaerobic Baffled Reactor (ABR) in Landfill Leachate Treatment

Document Type : Research Paper


1 M.Sc. Student, Department of Civil Eng., Shiraz University

2 Assistant Professor, Department of Civil Eng., Shiraz University

3 Professor, Department of Civil Eng., Shiraz University


Landfill leachate is one of the most contaminated wastewaters. Because of the widespread use of municipal landfills for final disposal of solid waste, there is an increasing concern over their public health and environmental hazards. In this study, the landfill leachate of city of Shiraz was successfully treated using an ABR system of 4 compartments with a capacity of 64 litters volume and a hydraulic retention time of 4 days. COD removal efficiencies of 82.38, 85.19, 82.53, 82.22, and 80.12 per cent were achieved for organic loading rates (OLR) of 1.2, 2, 3, 5, and 7.75 kg COD/m3/day, respectively. Sampling and test results revealed that the highest activity of acidogenesis bacteria belonged to the 1st compartment with the least amount of pH=6.54. It was shown that due to the formation of ammonia alkalinity in the reactor, there was a slight increase in the alkalinity of leachate with the maximum effluent amount of 6291 mg/l (as CaCO3)  in OLR=7.75 kg COD/m3/day. In this study, hydrodynamic characteristics and biological performance of an anaerobic baffled reactor (ABR) was also investigated. Residence time distribution (RTD) test with step input method was carried out on ABR. According to the graphs and theoretical model results, the number of CFSTRs was equal to the number of the ABR compartments (N=4).


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