Modeling oxidation ditches using the IAWPRC activated sludge model with hydrodynamic effects

Stamou, AI

dc.contributor.author	Stamou, AI	en
dc.date.accessioned	2014-03-01T02:41:02Z
dc.date.available	2014-03-01T02:41:02Z
dc.date.issued	1994	en
dc.identifier.issn	0273-1223	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30334
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0028033013&partnerID=40&md5=de641a2223b68269158b8b7a58ef003e	en
dc.subject	Dispersion coefficient	en
dc.subject	Hydrodynamics	en
dc.subject	IAWPRC model	en
dc.subject	Mathematical models	en
dc.subject	Oxidation ditches	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Biomass	en
dc.subject.other	Chemical oxygen demand	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Finite element method	en
dc.subject.other	Finite volume method	en
dc.subject.other	Hydrodynamics	en
dc.subject.other	Mathematical models	en
dc.subject.other	Oxidation	en
dc.subject.other	Aerobic oxidation ditch	en
dc.subject.other	Dissolved oxygen	en
dc.subject.other	Heterotrophs	en
dc.subject.other	Hydrodynamic effects	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	dissolved oxygen	en
dc.subject.other	activated sludge	en
dc.subject.other	biomass	en
dc.subject.other	chemical oxygen demand	en
dc.subject.other	concentration	en
dc.subject.other	conference paper	en
dc.subject.other	hydrodynamics	en
dc.subject.other	mathematical model	en
dc.subject.other	nonhuman	en
dc.subject.other	oxidation	en
dc.subject.other	oxygen consumption	en
dc.subject.other	productivity	en
dc.subject.other	steady state	en
dc.subject.other	velocity	en
dc.subject.other	waste water management	en
dc.subject.other	water flow	en
dc.subject.other	Ditches	en
dc.subject.other	Hydrodynamics	en
dc.subject.other	Modelling-Mathematical	en
dc.subject.other	Oxidation	en
dc.subject.other	Sewage Treatment	en
dc.title	Modeling oxidation ditches using the IAWPRC activated sludge model with hydrodynamic effects	en
heal.type	conferenceItem	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	A mathematical model is presented to predict the concentrations of the active heterotrophic biomass, the readily biodegradable substrate (soluble COD) and the dissolved oxygen (DO) in a completely aerobic oxidation ditch. The model involves the one-dimensional convection-dispersion equations for biomass, COD and DO. Hydrodynamic effects are represented in the model by the values of the average flow velocity and the dispersion coefficient. Biological processes are described in the model according to the IAWPRC activated sludge model, using typical values for the model parameters at 10°C. The equations are solved with the finite volume method. The application of the model leads to the following conclusions: (i) Steady state biomass concentrations are almost constant throughout the ditch. (ii) Steady state COD concentrations in the ditch are very low, and COD removal efficiency is practically independent of the values of the flow velocity and the dispersion coefficient. The distribution of the COD concentration in the ditch is less uniform, when small values of the dispersion coefficient are used. (iii) The distribution of the DO concentration in the ditch is very sensitive to the values of the flow velocity, the dispersion coefficient and to the capacity of the rotors. DO concentrations increase when the dispersion coefficient decreases or the flow velocity increases. (v) Daily sludge production, oxygen requirements and sludge age are calculated equal to 0.44 g (g COD removed)-1, 0.56 g (g incoming COD)-1 and 6.3 days, respectively.A mathematical model is used to predict the concentrations of the active heterotrophic biomass, the readily biodegradable substrate (soluble COD) and the dissolved oxygen (DO) in a completely aerobic oxidation ditch. It involves the one-dimensional convection-dispersion equations for biomass, COD, and DO. Hydrodynamic effects are represented in the model by the values of the average flow velocity and the dispersion coefficient. Biological processes are described in the model according to the IAWPRC activated sludge model. The equations are solved with the finite volume method.	en
heal.publisher	Pergamon Press Inc, Tarrytown, NY, United States	en
heal.journalName	Water Science and Technology	en
dc.identifier.isi	ISI:A1994PW23700021	en
dc.identifier.volume	30	en
dc.identifier.issue	2 pt 2	en
dc.identifier.spage	185	en
dc.identifier.epage	192	en