title: Distribution and mass transfer of dissolved oxygen in a multi-habitat membrane bioreactor.
abstract: This work investigated the DO distribution and the factors influencing the mass transfer of DO in a multi-habitat membrane bioreactor. Through the continuous measurements of an on-line automatic system, the timely DO values at different zones in the bioreactor were obtained, which gave a detailed description to the distribution of oxygen within the bioreactor. The results indicated that the growth of biomass had an important influence on the distribution of oxygen. As the extension of operational time, the volumetric oxygen mass transfer coefficient (kLa) was generally decreased. With the difference in DO values, a complex environment combining anoxic and oxic state was produced within a single bioreactor, which provided a fundamental guarantee for the total removal of TN. Aeration rate, the concentration and apparent viscosity of MLSS have different influences on kLa, but adjusting the viscosity is a feasible method to improve the mass transfer of oxygen in the bioreactor.
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, 510006 Guangzhou, PR China. Electronic address: renytang@163.com.
authors.forename: Bing
authors.initials: B
authors.lastname: Tang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, 510006 Guangzhou, PR China.
authors.forename: Bing
authors.initials: B
authors.lastname: Qiu
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, 510006 Guangzhou, PR China.
authors.forename: Shaosong
authors.initials: S
authors.lastname: Huang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, 510006 Guangzhou, PR China.
authors.forename: Kanghua
authors.initials: K
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, 510006 Guangzhou, PR China.
authors.forename: Liying
authors.initials: L
authors.lastname: Bin
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, 510006 Guangzhou, PR China.
authors.forename: Fenglian
authors.initials: F
authors.lastname: Fu
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, 510006 Guangzhou, PR China.
authors.forename: Huiwen
authors.initials: H
authors.lastname: Yang
mesh_terms: D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors; D004867:Equipment Design; D008567:Membranes, Artificial; D010100:Oxygen / Q000737:chemistry; D014783:Viscosity; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods; D062065:Wastewater / Q000737:chemistry
chemical_list: D008567:Membranes, Artificial; D010100:Oxygen; D062065:Wastewater
keywords: Dissolved oxygen; Mass transfer; Membrane bioreactor; Multi-habitat