title: Characterization and flocculation mechanism of a bioflocculant from hydrolyzate of rice stover.
abstract: This study investigated the characterization and flocculation mechanism of a bioflocculant from hydrolyzate of rice stover. Production of the bioflocculant was positively associated with cell growth and a highest value of 2.4 g L(-1) was obtained. During the kaolin suspension flocculation, charge neutralization and inter-particle bridging were proposed as the reasons for enhanced performance. Apart from this, the bioflocculant showed good performances in sludge dewatering and swine wastewater pretreatment. After conditioning by the bioflocculant, dry solids (DS) and specific resistance to filtration (SRF) of the sludge reached 18.4% and 4.8×10(12) m kg(-1), respectively, which were much better than that by conventional chemical flocculants. In the swine wastewater pretreatment, the removal efficiencies of COD, ammonium, and turbidity reached 48.3%, 43.6% and 75.8% at pH 8.0 when the bioflocculant dose was adjusted to 20 mg L(-1).
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan 610225, China. Electronic address: gjy@cuit.edu.cn.
authors.forename: Junyuan
authors.initials: J
authors.lastname: Guo
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan 610225, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yu
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan 610225, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Xin
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan 610225, China.
authors.forename: Changwu
authors.initials: C
authors.lastname: Zou
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan 610225, China.
authors.forename: Qingfeng
authors.initials: Q
authors.lastname: Cheng
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan 610225, China.
authors.forename: Huaijin
authors.initials: H
authors.lastname: Yang
authors.affiliation: College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan 610225, China.
authors.forename: Lichao
authors.initials: L
authors.lastname: Nengzi
mesh_terms: D000818:Animals; D004795:Enzyme Stability; D005427:Flocculation; D006868:Hydrolysis; D007616:Kaolin / Q000737:chemistry; D012275:Oryza / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013535:Suspensions; D013552:Swine; D013696:Temperature; D013997:Time Factors; D014866:Waste Products; D062065:Wastewater; D018508:Water Purification
chemical_list: D007616:Kaolin; D012722:Sewage; D013535:Suspensions; D014866:Waste Products; D062065:Wastewater
keywords: Bioflocculant; Rice stover; Sludge dewatering; Swine wastewater pretreatment