title: Effect of co-substrate, biomass and sulfate concentration on the performance of a control strategy used to determine the anaerobic stage length of an anaerobic/aerobic SBR degrading p-nitrophenol.
abstract: The effect of the p-nitrophenol to propionic acid ratio, the biomass concentration, and the presence of sulfates on the performance of a control strategy of an anaerobic/aerobic SBR degrading p-nitrophenol was studied. The duration of the anaerobic stage was controlled by an algorithm based on the on-line measurement of the oxidation-reduction potential, which indicates the end of the reduction of p-nitrophenol to p-aminophenol. It was observed that no significant influence on the performance of the algorithm was found when the co-substrate, the biomass concentration and the presence of sulfates were varied, indicating the robustness of the control strategy. Only for the case when a low concentration of cosubstrate was used, was there no transformation of p-nitrophenol.
authors.affiliation: Department of Environmental Bioprocesses, Institute of Engineering, National University of Mexico, Apartado Postal 70-472, 04510, Mexico DF, Mexico. gbm@pumas.iingen.unam.mx
authors.forename: G
authors.initials: G
authors.lastname: Buitrón
authors.forename: G
authors.initials: G
authors.lastname: Moreno
authors.forename: M E
authors.initials: ME
authors.lastname: García
authors.forename: J
authors.initials: J
authors.lastname: Moreno
mesh_terms: D000332:Aerobiosis; D000465:Algorithms; D000693:Anaerobiosis; D001420:Bacteria, Aerobic / Q000254:growth & development / Q000378:metabolism; D001421:Bacteria, Anaerobic / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology*; D009596:Nitrophenols / Q000378:metabolism*; D010084:Oxidation-Reduction; D011422:Propionates / Q000378:metabolism*; D012722:Sewage; D013431:Sulfates / Q000378:metabolism*
chemical_list: D009596:Nitrophenols; D011422:Propionates; D012722:Sewage; D013431:Sulfates; C029658:propionic acid; C024836:4-nitrophenol