Study on anaerobic treatment of wastewater containing hexavalent chromium.
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.
Xu
Yan-bin
YB
Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510090, China. hopeybxu@tom.com
Xiao
Hua-hua
HH
Sun
Shui-yu
SY
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods*; D002857:Chromium / Q000302:isolation & purification / Q000493:pharmacokinetics*; D007220:Industrial Waste / Q000517:prevention & control*; D012722:Sewage / Q000382:microbiology*; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D012722:Sewage; D002857:Chromium