Anaerobic Treatment of Landfill Leachate: A Case Study of Shiraz Landfill Leachate

Document Type : Research Paper


1 M.Sc. Dept. of Civil and Environmental Engineering, University of Shiraz

2 Assist. Prof., Dept. of Civil and Environmental Engineering, University of Shiraz


Degradation of the organic part of landfill in along with rainwater percolation produces a polluted liquid named "leachate", which poses a considerable hazard to the environment because of its toxic and hazardous compounds. In this research, the treatability of leachate was investigated using combined anaerobic digesters. Each digester had an effective volume of 150 l, a flow rate of 10 l/d, and a HRT of 15 d working at a temperature of 31°C (mesophilic). The OLR applied to the system was gradually increased from 0.07 to 3.4 g/l.d in 5 steps. TCOD concentration was 48552-62150.4 mg/l and BOD5/COD ratio was more than 0.7 during the study period. At an OLR of 2.2 g/l.d, the total maximum COD removal efficiency achieved in both digesters was 93.59%. Not only did ammonia concentration not reduce in the anaerobic system but it increased. Ammonia concentrations at optimum OLR in the influent to the 1st and 2nd digesters were 721, 952, and 1054 mg/l, respectively. Maximum biogas production was 9.823 l/day in the 1st digester and 6.298 l/day in the 2nd digester, both of which occurred at an OLR of 3.4 g/l.d.


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