his study was conducted to investigate the
treatment performance of anaerobic organism for stabilized
leachate under ambient air condition. The treatability of
landfill leachate was tested under various influences includ-
ing pH, dosage of anaerobic organism and contact time.
Laboratory experiment revealed that anaerobic organism was
in progressive state when the leachate in neutral condition. At
this phase, the removal efficiency of chemical oxygen
demand (COD), ammoniacal nitrogen (NH
3
–N) and colour of
76.84, 59.44 and 46.2 %, were experimentally attained. The
experimental results also showed that the the optimum vari-
ables condition was established at pH 7 of leachate sample,
dosage of 100 mL of anaerobic organism and required
14 days to reduce the COD, NH
3
–N and colour pollutants to
65.5, 60.2 and 46.3 %, respectively. The preliminary inves-
tigation shows that the anaerobic organisms were able to
remediate leachate pollutants by the microbial activity in the
leachate sample under ambient air condition