title: The numerical model of biosorption of Zn2+ and its application to the bio-electro tower reactor (BETR).
abstract: A 2-D numerical kinetic model considering flow velocity and adsorption is developed to simulate the bio-electro tower reactor (BETR). This new model considers the adsorbed amount when equilibrium qe as transient variable, which is superior to the old pseudo-first-order and the pseudo-second-order model which regards qe as a constant. We did research on the intensifying effect of electric field upon heavy metal ions adsorption process. The calculation result matches well with the experimental data. BETR is a coupling technique whose mechanism is that outer electric field can enhance the mass transfer rate when the solute is metal ions. Two kinds of carriers, pottery ball and 3-dimensional electrode (3DE), were used to support the biofilm layer; and organic wastewater that contains Zn(2+) is selected as a sample to validate the model. The 3DE carriers can be polarized by outer electric field, but pottery ball cannot. It is found that Zn(2+) transfers faster in 3DE carriers than in pottery ball (insulation materials); and an intensifying coefficientη is introduced to describe this effect in BETR.
authors.affiliation: State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin, 300387, China; School of Environmental & Chemical Engineering, Tianjin Polytechnic University, Tianjin, 300387, China. Electronic address: wangtao_20000@hotmail.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin, 300387, China; School of Environmental & Chemical Engineering, Tianjin Polytechnic University, Tianjin, 300387, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Computer Science & Software Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
authors.forename: Chunqing
authors.initials: C
authors.lastname: Li
authors.affiliation: School of Material Science & Chemical Engineering, Tianjin University of Sicence &Technology, Tianjin, 300457, China.
authors.forename: Bo-Tan
authors.initials: BT
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000465:Algorithms; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors / Q000382:microbiology*; D002413:Cations, Divalent / Q000032:analysis; D055664:Electrochemical Techniques / Q000379:methods*; D007700:Kinetics; D008962:Models, Theoretical; D012996:Solutions; D062065:Wastewater / Q000737:chemistry / Q000382:microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis*; D015032:Zinc / Q000032:analysis*
chemical_list: D002413:Cations, Divalent; D012996:Solutions; D062065:Wastewater; D014874:Water Pollutants, Chemical; D015032:Zinc
keywords: 3-Dimensional electrode; BETR; Biosorption; Mass transfer; Numerical model