Enhanced sulfate reduction with acidogenic sulfate-reducing bacteria 教程.pdf

Available online at Journal of Hazardous Materials 154 (2008) 1060–1065 Enhanced sulfate reduction with acidogenic sulfate-reducing bacteria Aijie Wang a , Nanqi Ren a , Xu Wang a , Duujong Lee a,b,∗ a School of Municipal Environmental Engineering, Harbin Institute of Technology, P.O. Box 2614, 202 Haihe Road, Harbin 150090, China b Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan Received 3 May 2007; received in revised form 10 October 2007; accepted 6 November 2007 Available online 17 November 2007 Abstract 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/SO4 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. © 2007 Elsevier B.V. All rights reserved. Keywords: Sulfate-reducing; COD/SO4 2− ratio; Acetate; Metabolism 1. Introduction