title: Substrate consumption and excess sludge reduction of activated sludge in the presence of uncouplers: a modeling approach.
abstract: A mathematical model with a consideration of energy spilling is developed to describe the activated sludge in the presence of different levels of metabolic uncouplers. The consumption of substrate and oxygen via energy spilling process is modeled with a Monod term, which is dependent on substrate and inhibitor. The sensitivity of the developed model is analyzed. Three parameters, maximum specific growth rate (micro(max)), energy spilling coefficient (q(max)), and sludge yield coefficient (Y(H)) are estimated with experimental data of different studies. The values of micro(max), q(max), and Y(H) are found to be 6.72 day(-1), 5.52 day(-1), and 0.60 mg COD mg(-1) COD for 2, 4-dinitrophenol and 7.20 day(-1), 1.58 day(-1), and 0.62 mg COD mg(-1) COD for 2, 4-dichlorophenol. Substrate degradation and sludge yield could be predicted with this model. The activated sludge process in the presence of uncouplers that is described more reasonably by the new model with a consideration of energy spilling. The effects of uncouplers on substrate consumption inhibition and excess sludge reduction in activated sludge are quantified with this model.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Wen-Ming
authors.initials: WM
authors.lastname: Xie
authors.forename: Bing-Jie
authors.initials: BJ
authors.lastname: Ni
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Sheng
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
authors.forename: Min
authors.initials: M
authors.lastname: Yang
mesh_terms: D003470:Culture Media; D008954:Models, Biological; D012722:Sewage / Q000382:microbiology*; D014475:Uncoupling Agents / Q000494:pharmacology*
chemical_list: D003470:Culture Media; D012722:Sewage; D014475:Uncoupling Agents