title: Biological sulfate reduction in the acidogenic phase of anaerobic digestion under dissimilatory Fe (III)--reducing conditions.
abstract: In this study, a novel approach was developed for sulfate - containing wastewater treatment via dosing Fe₂O₃ in a two - stage anaerobic reactor (A1, S1). The addition of Fe₂O₃ in its second stage i.e. acidogenic sulfate-reducing reactor (S1) resulted in microbial reduction of Fe (III), which significantly enhanced the biological sulfate reduction. In reactor S1, increasing influent sulfate concentration to 1400 mg/L resulted in a higher COD removal (27.3%) and sulfate reduction (57.9%). In the reference reactor without using Fe₂O₃ (S2), the COD and sulfate removal were 15.6% and 29%, respectively. The combined performance of the two-stage anaerobic reactor (A1, S1) also showed a higher COD removal of 74.2%. Denaturing gradient gel electrophoresis (DGGE) and phylogenetic analysis showed that the dominant bacteria with high similarity to IRB species as well as sulfate reducer Desulfovibrio and acidogenic bacteria (AB) were enriched in S1. Quantitative Polymerase Chain Reaction (qPCR) analysis presented a higher proportion of sulfate reducer Desulfovibrio marrakechensis and Fe (III) reducer Iron-reducing bacteria HN54 in S1.
authors: Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
authors: Jingxin
authors: J
authors: Zhang
authors: Yaobin
authors: Y
authors: Zhang
authors: Jinghui
authors: J
authors: Chang
authors: Xie
authors: X
authors: Quan
authors: Qi
authors: Q
authors: Li
mesh_terms: D061271:Acidobacteria / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism; D019149:Bioreactors / Q000382:microbiology*; D002681:China; D003901:Desulfovibrio / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000378:metabolism; D005285:Fermentation; D005290:Ferric Compounds / Q000737:chemistry / Q000378:metabolism*; D006089:Gram-Negative Anaerobic Bacteria / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D006094:Gram-Positive Bacteria / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D006812:Humic Substances / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D010084:Oxidation-Reduction; D010802:Phylogeny; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D013431:Sulfates / Q000032:analysis / Q000378:metabolism*; D013559:Symbiosis; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology; D018508:Water Purification
chemical_list: D001426:Bacterial Proteins; D005232:Fatty Acids, Volatile; D005290:Ferric Compounds; D006812:Humic Substances; D012722:Sewage; D013431:Sulfates; D062065:Wastewater; C000499:ferric oxide