title: New insight into the biological treatment by activated sludge: the role of adsorption process.
abstract: The objective of this study was to evaluate the effect of adsorption on the biological treatment process of wastewater. In the absence of substrate in the water, activated sludge developed well in the first hour, indicating that the growth of microorganism was not directly related to substrate concentration and the dissolved organic matter in the water assays were performed, no organic matter was detected out, revealing that there was no desorption in the activated sludge adsorption process. Activated sludge batch growth experiments in the presence of different adsorption capacities indicated that specific growth rate increased as specific adsorption capacity increased. The experiment on the relationship of adsorption capacity and substrate concentration or sludge concentration was also carried out. Specific adsorption capacity increased as sludge load increased, presenting linear correlation. The experiment results showed that adsorption should be taken into account in the study of the biological treatment process of wastewater.
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China. Electronic address: zxccxz623@ysu.edu.cn.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Xinrun
authors.initials: X
authors.lastname: Li
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China. Electronic address: zhangqr@ysu.edu.cn.
authors.forename: Qingrui
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Qiuming
authors.initials: Q
authors.lastname: Peng
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
authors.forename: Faming
authors.initials: F
authors.lastname: Gao
mesh_terms: D000327:Adsorption; D001419:Bacteria / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D012722:Sewage / Q000382:microbiology*; D062065:Wastewater / Q000382:microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D062065:Wastewater
keywords: Activated sludge; Adsorption; Microorganism; Specific growth rate