title: Degradation properties of protein and carbohydrate during sludge anaerobic digestion.
abstract: Degradation of protein and carbohydrate is vital for sludge anaerobic digestion performance. However, few studies focused on degradation properties of protein and carbohydrate. This study investigated detailed degradation properties of sludge protein and carbohydrate in order to gain insight into organics removal during anaerobic digestion. Results showed that carbohydrate was more efficiently degraded than protein and was degraded prior to protein. The final removal efficiencies of carbohydrate and protein were 49.7% and 32.2%, respectively. The first 3 days were a lag phase for protein degradation since rapid carbohydrate degradation in this phase led to repression of protease formation. Kinetics results showed that, after initial lag phase, protein degradation followed the first-order kinetic with rate constants of 0.0197 and 0.0018 d(-1) during later rapid degradation phase and slow degradation phase, respectively. Carbohydrate degradation also followed the first-order kinetics with a rate constant of 0.007 d(-1) after initial quick degradation phase.
authors.affiliation: School of Environment & Natural Resource, Renmin University of China, 59 Zhongguancun Street, Beijing 100872, China.
authors.forename: Guang
authors.initials: G
authors.lastname: Yang
authors.affiliation: School of Environmental Science & Engineering, Beijing Forestry University, 35 Qinghudong Road, Beijing 100083, China.
authors.forename: Panyue
authors.initials: P
authors.lastname: Zhang
authors.affiliation: School of Environment & Natural Resource, Renmin University of China, 59 Zhongguancun Street, Beijing 100872, China. Electronic address: zgm@ruc.edu.cn.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhang
authors.affiliation: School of Environment & Natural Resource, Renmin University of China, 59 Zhongguancun Street, Beijing 100872, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environment & Natural Resource, Renmin University of China, 59 Zhongguancun Street, Beijing 100872, China.
authors.forename: Anqi
authors.initials: A
authors.lastname: Yang
mesh_terms: D000693:Anaerobiosis / Q000502:physiology; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002241:Carbohydrates / Q000737:chemistry*; D007700:Kinetics; D011506:Proteins / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods
chemical_list: D002241:Carbohydrates; D011506:Proteins; D012722:Sewage
keywords: Anaerobic digestion; Carbohydrate; Protein; Sludge