Hydraulic investigations into decanting from IEA wastewater treatment plants. January 1988. Witheridge, G. M. en_US Wilkinson, D. L. en_US 2021-11-25T12:39:47Z 2021-11-25T12:39:47Z 1988 en_US
dc.description.abstract Describes an investigation into the mechanisms responsible for sludge carry-over during decant from intermittent aeration tanks. Three possible modes of failure were identified: 1. early carry-over which may occur during the transient phase at the start of decant; 2. a failure selectively to withdraw from the supernatant alone; 3. scour failure of the sludge blanket when the interfacial shear stress exceeds some critical value. This mode of failure is analagous to the onset of erosion in cohesive sediments. A variety of experiments were conducted to develop design criteria to ensure against sludge carry-over. The experiments indicated that modes one and three were the most significant, and that the critical parameter was the velocity of the supernatant as it approached the weir. It is therefore concluded that a maximum upstream velocity is the most appropriate design criterion for a decant mechanism. Appreciation of the failure mechanisms has indicated certain design improvements which might be made to existing aeration tanks, in particular to the rate of change of weir loading, and the design of scum barriers. en_US
dc.description.sponsorship Public Works Department, N.S.W. en_US
dc.identifier.isbn 0858243555 en_US
dc.language English
dc.language.iso EN en_US
dc.publisher University of New South Wales - Water Research Laboratory en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.source WRL Digitisation
dc.subject.other selective withdrawal en_US
dc.subject.other wastewater treatment en_US
dc.subject.other wastewater facilities en_US
dc.subject.other activated sludge process en_US
dc.subject.other Hastings Municipal Council en_US
dc.subject.other Wingecarribee Shire en_US
dc.subject.other Shoalhaven City en_US
dc.title Hydraulic investigations into decanting from IEA wastewater treatment plants. January 1988. en_US
dc.type Report en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.description.notePublic Supplementary notes: See Research report 175 for more detail.. en_US
unsw.identifier.doi en_US Sydney en_US
unsw.relation.faculty Engineering
unsw.relation.ispartofreportnumber UNSW Water Research Laboratory Report No. 172 en_US
unsw.relation.originalPublicationAffiliation Witheridge, G. M., Water Research Laboratory, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Wilkinson, D. L., Water Research Laboratory, Faculty of Engineering, UNSW en_US School of Civil and Environmental Engineering *
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