title: Determination and discussion hydraulic retention time in membrane bioreactor system.
abstract: Based on the microorganism kinetic model, the formula for computing hydraulic retention time in a membrane bioreactor system (MBR) is derived. With considering HRT as an evaluation index a combinational approach was used to discuss factors which have an effect on MBR. As a result, the influencing factors were listed in order from strength to weakness as: maximum specific removal rate K, saturation constant Ks, maintenance coefficient m, maximum specific growth rate mu m and observed yield coefficient Yobs. Moreover, the formula was simplified, whose parameters were experimentally determined in petrochemical wastewater treatment. The simplified formula is theta = 1.1(1/beta-1) (Ks + S)/KX0, for petrochemical wastewater treatment K and Ks equaled 0.185 and 154.2, respectively.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (CAS), Beijing 100085, China. syzhang@rci.rutgers.edu
authors.forename: Shao-yuan
authors.initials: SY
authors.lastname: Zhang
authors.forename: Renze
authors.initials: R
authors.lastname: van Houten
authors.forename: Dick H
authors.initials: DH
authors.lastname: Eikelboom
authors.forename: Zhao-chun
authors.initials: ZC
authors.lastname: Jiang
authors.forename: Yao-bo
authors.initials: YB
authors.lastname: Fan
authors.forename: Ju-si
authors.initials: JS
authors.lastname: Wang
mesh_terms: D019149:Bioreactors; D007220:Industrial Waste; D007700:Kinetics; D008962:Models, Theoretical; D009716:Numerical Analysis, Computer-Assisted; D010578:Petroleum / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000378:metabolism; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D007220:Industrial Waste; D010578:Petroleum; D014874:Water Pollutants, Chemical