Pretreatment of coking wastewater using anaerobic sequencing batch reactor (ASBR).
- Author:
Bing LI
1
;
Ying-lan SUN
;
Yu-ying LI
Author Information
1. Institute of Environmental Science and Engineering, Ocean University of China, Qingdao 266003, China. Lilibing188@sina.com
- Publication Type:Journal Article
- MeSH:
Bacteria, Anaerobic;
metabolism;
Bioreactors;
microbiology;
Cell Culture Techniques;
methods;
Coke;
microbiology;
Industrial Waste;
prevention & control;
Sewage;
microbiology;
Water Pollutants, Chemical;
metabolism;
Water Purification;
methods
- From:
Journal of Zhejiang University. Science. B
2005;6(11):1115-1123
- CountryChina
- Language:English
-
Abstract:
A laboratory-scale anaerobic sequencing batch reactor (ASBR) was used to pretreat coking wastewater. Inoculated anaerobic granular biomass was acclimated for 225 d to the coking wastewater, and then the biochemical methane potential (BMP) of the coking wastewater in the acclimated granular biomass was measured. At the same time, some fundamental technological factors, such as the filling time and the reacting time ratio (t(f)/t(r)), the mixing intensity and the intermittent mixing mode, that affect anaerobic pretreatment of coking wastewater with ASBR, were evaluated through orthogonal tests. The COD removal efficiency reached 38%-50% in the stable operation period with the organic loading rate of 0.37-0.54 kg COD/(m(3).d) at the optimum conditions of t(f)/t(r), the mixing intensity and the intermittent mixing mode. In addition, the biodegradability of coking wastewater distinctly increased after the pretreatment using ASBR. At the end of the experiment, the microorganism forms on the granulated sludge in the ASBR were observed using SEM (scanning electron microscope) and fluoroscope. The results showed that the dominant microorganism on the granular sludge was Methanosaeta instead of Methanosarcina dominated on the inoculated sludge.
