Settling behaviour of polymer flocculated water-treatment sludge I : analyses of settling curves

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Show simple item record Zhao, Y.Q. 2011-09-27T13:38:29Z 2011-09-27T13:38:29Z 2004 Elsevier B.V. en 2004-02
dc.identifier.citation Separation and Purification Technology en
dc.identifier.issn 1383-5866
dc.description.abstract Settling behaviour of polymer conditioned water-treatment sludge was investigated in this study for the purpose of a better understanding of a so-called “CML30 method”, which was developed in previous study to evaluate the optimum polymer dosage in sludge conditioning. The “CML30 method” is on the basis of a 30 min settling test in 100 ml measuring cylinders. In this study, the series of settling tests in 100, 500 and 1000 ml measuring cylinders were respectively performed and the settling curves (interfacial height to dose and time) were the main focuses for presentation and analyses in great detail in this paper. According to the experimental data presented in this study, settling behaviour may be controlled by both the growth of large sized floc and progressively decreased viscosity. The “speed-up” phenomenon in small polymer dose range obviously enhances the settlement and plays a critical role for the settling set in a 100 ml measuring cylinder at a special dose and at the settling time interval 5-30 min. It is such special observation that leads to the success of so-called ad hoc “CML30 method”. However, sludge settling behaviour could be controlled by the formation of networked structure which is involved in excess polymer during the large range (say over 10 mg/l for the case tested) of polymer doses. The higher liquid viscosity values derived from excess polymer will increase the drag force for the resistance of the settlement. In addition, wall effects are likely to interplay with the internal networked structure in large dosed region. en
dc.description.sponsorship Not applicable en
dc.format.extent 484418 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Elsevier en
dc.relation.requires Architecture, Landscape & Civil Engineering Research Collection en
dc.relation.requires Critical Infrastructure Group Research Collection en
dc.relation.requires Urban Institute Ireland Research Collection en
dc.rights This is the author’s version of a work that was accepted for publication in Separation and Purification Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Separation and Purification Technology, 35 (1): 71-80 DOI:10.1016/S1383-5866(03)00132-1 en
dc.subject Alum sludge en
dc.subject Flocculation en
dc.subject Polymer dosage en
dc.subject Settlement en
dc.subject Viscosity en
dc.subject Wall effect en
dc.subject.lcsh Water treatment plant residuals en
dc.subject.lcsh Flocculation en
dc.subject.lcsh Polymers en
dc.title Settling behaviour of polymer flocculated water-treatment sludge I : analyses of settling curves en
dc.type Journal Article en
dc.internal.availability Full text available en
dc.internal.webversions en
dc.status Peer reviewed en
dc.identifier.volume 35 en
dc.identifier.issue 1 en
dc.identifier.startpage 71 en
dc.identifier.endpage 80 en
dc.identifier.doi 10.1016/S1383-5866(03)00132-1
dc.neeo.contributor Zhao|Y.Q.|aut| en
dc.description.admin ti,SB-08/09/2011 en

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