Sequential biological anaerobic-aerobic treatment of oil shale ash dump leachate was studied using laboratory-scale reactors and bioassays. The COD of the leachate wad 2.0-3.0 g dm -3 . The leachate was known to contain several phenolic compounds and to have a high sulphur concentration. The proportion of the leachate in the feed of the biological process was gradually increased during a 309 day test period. With 100% leachate in the feed, COD removal was 35% in the anaerobic stage while in the combined process the COD and BOD 7 removals were up to 75% and 99%, respectively. The removal of total phenols was insignificant in the anaerobic stage, while up to 85% removal was obtained by the combined anaerobic-aerobic process. In the anaerobic stage, degradation of organic compounds was mainly a result of sulphide production. The results demonstrated that the leachates were amenable to biological treatment
[1]
L. Young,et al.
Methanogenic degradation of four phenolic compounds
,
1985
.
[2]
S. Masunaga,et al.
Biodegradation pathway of o-cresol by heterogeneous culture Phenol acclimated activated sludge
,
1986
.
[3]
Gatze Lettinga,et al.
Biotechnological sulphide removal from effluents.
,
1991
.
[4]
Asher Brenner,et al.
Treatment of a high-strength, mixed phenolic waste in an SBR
,
1992
.
[5]
A. E. Greenberg,et al.
Standard methods for the examination of water and wastewater : supplement to the sixteenth edition
,
1988
.
[6]
M. Suidan,et al.
Anaerobic Treatment of Coal Gasification Wastewater
,
1987
.
[7]
Peter Fox,et al.
Anaerobic treatment of a biologically inhibitory wastewater
,
1988
.