title: Effects of various pretreatments on biological sulfate reduction with waste activated sludge as electron donor and waste activated sludge diminution under biosulfidogenic condition.
abstract: The current study focused on the influences of various pretreatments, including alkaline, ultrasonic and thermal pretreatments on biological sulfate reduction with waste activated sludge (WAS) as sole electron donor. Our results showed that thermal and ultrasonic pretreatments increased the sulfate reduction percentage by 14.8% and 7.1%, respectively, compared with experiment with raw WAS, while alkaline pretreatment decreased the sulfate reduction percentage by 46%. By analyzing the WAS structure, particle size distribution, organic component, and enzyme activity after different pretreatments, we studied the effects of these pretreatments on WAS as well as on the mechanisms of how biological sulfate reduction was affected. The reduction of WAS and variation of WAS structure in the process of sulfate reduction were investigated. Our results showed that biosulfidogenesis was an efficient method of diminishing WAS, and various pretreatments could enhance the reduction efficiency of volatile solid in the WAS.
authors.affiliation: National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, P.O. Box 353, Beijing 100190, China.
authors.forename: Yuxing
authors.initials: Y
authors.lastname: Sheng
authors.forename: Hongbin
authors.initials: H
authors.lastname: Cao
authors.forename: Yuping
authors.initials: Y
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D001673:Biodegradation, Environmental; D002681:China; D002851:Chromatography, High Pressure Liquid; D004583:Electrons; D005232:Fatty Acids, Volatile / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D010100:Oxygen / Q000032:analysis; D010316:Particle Size; D010447:Peptide Hydrolases / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000032:analysis*; D013431:Sulfates / Q000737:chemistry*; D000516:alpha-Amylases / Q000737:chemistry / Q000378:metabolism; D000520:alpha-Glucosidases / Q000737:chemistry / Q000378:metabolism
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D013431:Sulfates; D000516:alpha-Amylases; D000520:alpha-Glucosidases; D010447:Peptide Hydrolases; D010100:Oxygen