title: Modeling of the denitrification/anaerobic digestion process of salmon fishery wastewater in a biofilm tubular reactor.
abstract: The literature has paid scarce attention to the modeling of the denitrification-anaerobic digestion process in packed bed biofilm tubular reactors used to treat wastewater. The present study obtained a steady-state model for industrial salmon fishery wastewater treatment in a biofilm tubular reactor, including pH as a variable and the effect of biomass on hydrolysis. The axial profile of the reactor components and process efficiency were predicted with deviations below 6%. The optimal operating zone for the process was found at hydraulic retention time (HRT)>1.5d and inlet protein concentration (S(prot,0))<3000 mgTOCL(-1). Based on our results, we concluded that the removal of organic matter and nitrogen compounds depended mainly on HRT. The effluent pH was mainly affected by the C/N ratio, where a decrease increases pH. Organic matter removal was related with the anaerobic digestion process, while denitrification influenced mostly nitrate and nitrite removal.
authors.affiliation: Department of Chemical Engineering, University of Santiago of Chile, Santiago, Chile. cesar.huilinir@usach.cl
authors.forename: César
authors.initials: C
authors.lastname: Huiliñir
authors.forename: Estrella
authors.initials: E
authors.lastname: Aspé
authors.forename: Marlene
authors.initials: M
authors.lastname: Roeckel
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000502:physiology*; D018441:Biofilms; D019149:Bioreactors; D002244:Carbon / Q000032:analysis; D002849:Chromatography, Gas; D058440:Denitrification / Q000502:physiology*; D005398:Fisheries / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008954:Models, Biological; D009584:Nitrogen / Q000032:analysis; D012474:Salmon; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D002244:Carbon; D009584:Nitrogen