title: Combined effect of sodium dodecyl sulfate and enzyme on waste activated sludge hydrolysis and acidification.
abstract: The combined effect of sodium dodecyl sulfate (SDS) and enzyme system on hydrolysis and acidification of waste activated sludge (WAS) was investigated. The results showed that the combined system was more effective in the promotion of sludge hydrolysis than sole SDS and sole enzyme, and the SDS+mixed-enzymes (ME) system had better hydrolysis performance than SDS+single enzyme system. Compared with SDS+protease and SDS+amylase systems, the soluble protein concentration in SDS+ME system increased respectively by 20.0% and 44.4%, and the soluble carbohydrate concentration increased by 78.3% and 37.0%, respectively. During the WAS acidification stage, the SDS, ME and SDS+ME system could make the maximum short-chain fatty acids (SCFAs) concentration increased by 1.82 (6th day), 2.04 (5th day), 2.32 (7th day) times, respectively. The composition analysis of SCFAs produced in SDS+ME system indicated that acetic acid was the most prevalent product and propionic acid was the second one.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
authors.forename: Kun
authors.initials: K
authors.lastname: Luo
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.forename: Jing
authors.initials: J
authors.lastname: Yu
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Li
authors.forename: Guo-jing
authors.initials: GJ
authors.lastname: Yang
authors.forename: Bing-xin
authors.initials: BX
authors.lastname: Xie
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
authors.forename: Guang-ming
authors.initials: GM
authors.lastname: Zeng
mesh_terms: D000143:Acids / Q000737:chemistry*; D000704:Analysis of Variance; D002241:Carbohydrates / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D006868:Hydrolysis / Q000187:drug effects; D009584:Nitrogen / Q000032:analysis; D010447:Peptide Hydrolases / Q000494:pharmacology*; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012037:Refuse Disposal; D012722:Sewage / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000494:pharmacology*; D012995:Solubility / Q000187:drug effects; D000516:alpha-Amylases / Q000494:pharmacology*
chemical_list: D000143:Acids; D002241:Carbohydrates; D005227:Fatty Acids; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D012967:Sodium Dodecyl Sulfate; D000516:alpha-Amylases; D010447:Peptide Hydrolases; D009584:Nitrogen