Enhanced sulfate reduction with acidogenic sulfate-reducing bacteria.
Sulfate reduction in a continuous flow, acidogenic reactor using molasses wastewater as the carbon source was studied at varying chemical oxygen demand/sulfate (COD/SO4(2-)) ratios. At a critical COD/SO4(2-) ratio of 2.7, neither COD nor sulfate were in excess for extra production of ethanol or acetate in the reactor. An acetic-type microbial metabolism was established with sulfate-reducing bacteria (SRB) significantly consuming hydrogen and volatile fatty acids produced by acidogenic bacteria and hydrogen producing acetogens in degrading COD, thereby yielding sulfate removal rate>94.6%. A low critical COD/SO(4)2- ratio of 1.6 was also observed with the enriched ASRB population in reactor which overcomes the barrier to the treatment capability of sulfate-laden wastewater treatment with limited COD supply.
Wang
Aijie
A
School of Municipal & Environmental Engineering, Harbin Institute of Technology, P.O. Box 2614, 202 Haihe Road, Harbin 150090, China.
Ren
Nanqi
N
Wang
Xu
X
Lee
Duujong
D
D019149:Bioreactors; D008965:Molasses; D010084:Oxidation-Reduction; D013431:Sulfates / Q000378:metabolism*; D016999:Sulfur-Reducing Bacteria / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D013431:Sulfates; D014874:Water Pollutants, Chemical