title: Performance of the lysozyme for promoting the waste activated sludge biodegradability.
abstract: The fresh waste activated sludge (WAS) from a lab-scale sequencing batch reactor was used to determine the performance of the lysozyme for promoting its biodegradability. The results showed that a strict linear relationship presented between the degree of disintegration (DDM) of WAS and the lysozyme incubation time from 0 to 240min (R(2) was 0.992, 0.995 and 0.999 in accordance with the corresponding lysozyme/TS, respectively). Ratio of net SCOD increase augmented significantly by lysozyme digestion for evaluating the sludge biodegradability changes. Moreover, the protein dominated both in the EPS and SMP. In addition, the logarithm of SMP contents in supernatant presented an increasing trend similar with the ascending logarithmic relation with the lysozyme incubation time from 0 to 240min (R(2) was 0.960, 0.959 and 0.947, respectively). The SMP, especially the soluble protein, had an important contribution to the improvement of WAS biodegradability.
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: junguohe@263.net.
authors.forename: Jun-Guo
authors.initials: JG
authors.lastname: He
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Xin
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Qiu
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Zhi-Dan
authors.initials: ZD
authors.lastname: Wen
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Tang
mesh_terms: D001673:Biodegradation, Environmental; D002244:Carbon / Q000378:metabolism; D009113:Muramidase / Q000378:metabolism*; D011134:Polysaccharides / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D012722:Sewage / Q000032:analysis / Q000382:microbiology*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D011134:Polysaccharides; D011506:Proteins; D012722:Sewage; D002244:Carbon; D009113:Muramidase
keywords: Degree of disintegration (DD(M)); Extracellular polymeric substances; Lysozyme digestion; Sludge biodegradability; Soluble microbial products