Study on anaerobic treatment of wastewater containing hexavalent chromium.
- Author:
Yan-bin XU
1
;
Hua-hua XIAO
;
Shui-yu SUN
Author Information
1. Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510090, China. hopeybxu@tom.com
- Publication Type:Journal Article
- MeSH:
Bacteria, Anaerobic;
metabolism;
Biodegradation, Environmental;
Bioreactors;
microbiology;
Cell Culture Techniques;
methods;
Chromium;
isolation & purification;
pharmacokinetics;
Industrial Waste;
prevention & control;
Sewage;
microbiology;
Water Purification;
methods
- From:
Journal of Zhejiang University. Science. B
2005;6(6):574-579
- CountryChina
- Language:English
-
Abstract:
A self-made anaerobic bio-filter bed which was inoculated with special sludge showed high efficiency in removing hexavalent chromium. When pump flow was 47 ml/min and COD(Cr) of wastewater was about 140 mg/L, it took 4 h to decrease the Cr6+ concentrations from about 60 mg/L to under 0.5 mg/L, compared with 14 h without carbon source addition. Cr6+ concentrations ranged from 64.66 mg/L to 75.53 mg/L, the system efficiency was excellent. When Cr6+ concentration reached 95.47 mg/L, the treatment time was prolonged to 7.5 h. Compared with the contrast system, the system with trace metals showed clear superiority in that the Cr6+ removal rate increased by 21.26%. Some analyses also showed that hexavalent chromium could probably be bio-reduced to trivalent chromium, and that as a result, the chrome hydroxide sediment was formed on the surface of microorganisms.
