Design of secondary settling tanks using a CFD model

Stamou, AI; Theodoridis, G; Xanthopoulos, K

dc.contributor.author	Stamou, AI	en
dc.contributor.author	Theodoridis, G	en
dc.contributor.author	Xanthopoulos, K	en
dc.date.accessioned	2014-03-01T01:30:07Z
dc.date.available	2014-03-01T01:30:07Z
dc.date.issued	2009	en
dc.identifier.issn	0733-9372	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19479
dc.subject	Computational fluid dynamics technique	en
dc.subject	Density currents	en
dc.subject	Flow simulation	en
dc.subject	Sedimentation tanks	en
dc.subject	Simulation models	en
dc.subject	Wastewater treatment	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	CFD models	en
dc.subject.other	Completely-mixed	en
dc.subject.other	Computational fluid dynamics technique	en
dc.subject.other	Density currents	en
dc.subject.other	Design condition	en
dc.subject.other	Empirical design	en
dc.subject.other	Scaling parameter	en
dc.subject.other	Secondary settling tanks	en
dc.subject.other	Sedimentation tanks	en
dc.subject.other	Simulation models	en
dc.subject.other	Suspended solids	en
dc.subject.other	Three-layer	en
dc.subject.other	Type II	en
dc.subject.other	Wastewater treatment plants	en
dc.subject.other	Chemical oxygen demand	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Design	en
dc.subject.other	Effluents	en
dc.subject.other	Flocculation	en
dc.subject.other	Flow simulation	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Pumps	en
dc.subject.other	Sedimentation	en
dc.subject.other	Settling tanks	en
dc.subject.other	Sewage	en
dc.subject.other	Sewage treatment	en
dc.subject.other	Simulators	en
dc.subject.other	Tanks (containers)	en
dc.subject.other	Wastewater	en
dc.subject.other	Wastewater reclamation	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	Water recycling	en
dc.subject.other	Water treatment plants	en
dc.subject.other	Sewage settling tanks	en
dc.subject.other	computational fluid dynamics	en
dc.subject.other	design	en
dc.subject.other	flocculation	en
dc.subject.other	modeling	en
dc.subject.other	performance assessment	en
dc.subject.other	sedimentation	en
dc.subject.other	sewage	en
dc.subject.other	wastewater	en
dc.subject.other	water treatment	en
dc.subject.other	Psyttalia	en
dc.title	Design of secondary settling tanks using a CFD model	en
heal.type	journalArticle	en
heal.identifier.primary	10.1061/(ASCE)0733-9372(2009)135:7(551)	en
heal.identifier.secondary	http://dx.doi.org/10.1061/(ASCE)0733-9372(2009)135:7(551)	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	A computational fluid dynamics (CFD) model is presented and applied in the design of the secondary settling tanks of Psyttalia Wastewater Treatment Plant in Athens, Europe's largest sewage treatment facility. The tanks are of the Gould Type II consisting of the following regions: an inlet-flocculation chamber with an inlet baffle, two zones of settling separated by an intermediate baffle, an outlet region, and a sludge collection region. The number of tanks and their dimensions were determined with an empirical design procedure. Then, theoretical considerations, information from similar existing tanks, and preliminary CFD calculations were combined to determine the dimensions of the main regions and the positions of the baffles. Finally, detailed CFD calculations were performed to examine the performance of the tanks for various design conditions. Computations showed that the flow in the inlet-flocculation region was completely mixed; while in the settling regions a ""three-layer"" structure with relatively constant layer heights was observed. CFD results were processed to determine parameters of practical interest, including the heights of the sludge blankets and the effluent suspended solids concentrations; these parameters were correlated satisfactorily with the Hazen number, which is used as a scaling parameter in primary settling tanks. © 2009 ASCE.	en
heal.publisher	ASCE-AMER SOC CIVIL ENGINEERS	en
heal.journalName	Journal of Environmental Engineering	en
dc.identifier.doi	10.1061/(ASCE)0733-9372(2009)135:7(551)	en
dc.identifier.isi	ISI:000267055100009	en
dc.identifier.volume	135	en
dc.identifier.issue	7	en
dc.identifier.spage	551	en
dc.identifier.epage	561	en