title: Treatment of domestic wastewater by an integrated anaerobic fluidized-bed membrane bioreactor under moderate to low temperature conditions.
abstract: The performance of a novel integrated anaerobic fluidized-bed membrane bioreactor (IAFMBR) for treating practical domestic wastewater was investigated at a step dropped temperature from 35, 25, to 15°C. The COD removal was 74.0 ± 3.7%, 67.1 ± 2.9% and 51.1 ± 2.6% at 35, 25 and 15°C, respectively. The COD removal depended both on influent strength and operational temperature. The accumulation of VFAs (Volatile Fatty Acids) was affected by temperature, and acetic acid was the most sensitive one to the decrease of temperature. The methanogenic activity of the sludge decreased eventually and the methane yield was dropped from 0.17 ± 0.03, 0.15 ± 0.02 to 0.10 ± 0.01 L/Ld. And as compared with a mesophilic temperature, a low temperature can accelerate membrane biofouling. Proteins were the dominant matters causing membrane fouling at low temperature and membrane fouling can be mitigated by granular active carbon (GAC) through protein absorption.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: gaodw@hit.edu.cn.
authors.forename: Da-Wen
authors.initials: DW
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Yao
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Nan-Qi
authors.initials: NQ
authors.lastname: Ren
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000382:microbiology; D057919:Biological Oxygen Demand Analysis; D001704:Biopolymers / Q000032:analysis; D019149:Bioreactors / Q000382:microbiology*; D003080:Cold Temperature; D005232:Fatty Acids, Volatile / Q000378:metabolism; D008567:Membranes, Artificial; D008697:Methane / Q000096:biosynthesis; D011312:Pressure; D012995:Solubility; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D056804:Biofuels; D001704:Biopolymers; D005232:Fatty Acids, Volatile; D008567:Membranes, Artificial; D008697:Methane; D062065:Wastewater
keywords: Anaerobic membrane bioreactor (AnMBR); Domestic wastewater; Membrane fouling; Resource recovery; Temperature