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Article: Coagulation and sedimentation of particulate pollutants in marine waters after wastewater outfall discharge

TitleCoagulation and sedimentation of particulate pollutants in marine waters after wastewater outfall discharge
Authors
KeywordsCoagulation
Flocculation
Numerical simulation
Outfall
Particle
Sedimentation
Sewage
Issue Date2006
PublisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwst_ws
Citation
Water Science And Technology: Water Supply, 2006, v. 6 n. 1, p. 79-86 How to Cite?
AbstractOutfall discharge to seawater is generally used as a practical means of wastewater disposal in many coastal cities. However, deposition of solid pollutants from the wastewater on the seabed would affect the benthic communities. In the present study, both laboratory experiments and numerical simulations were carried out on the role of particle coagulation in the transport and sedimentation of sewage solid materials in marine waters after outfall discharge. Actual sewage samples were collected from two treatment plants in Hong Kong for the experimental study. A flocculator-imaging system was developed for characterization of the particle size distribution (PSD) dynamics during flocculation and dilution of sewage particles in seawater. The system consisted of an external flow-through cell, a microscopic CCD video recorder and an image analyzer. The laboratory results demonstrated that coagulation played an important role in regulating the transport of solid pollutants in marine waters. Flocculation of 30-45 min could shift the PSD considerably, transforming small particles to larger, fast-settling particle aggregates. With a growth in particle size by flocculation, the average settling velocity of the sewage particulates increased by a factor of 2 or more. In addition to the laboratory study, a mathematical model was developed to simulate the transport dynamic of wastewater particles in seawater after outfall discharge. The results of numerical simulations compared well with the experimental observations. Both laboratory and simulation results suggest the important role of coagulation in the transport and sedimentation dynamics of sewage particles in marine waters, especially in the early phase of outfall discharge. As a result, suspended solids from the wastewater discharge would deposit more closely in the vicinity of the outfall sites. © IWA Publishing 2006.
Persistent Identifierhttp://hdl.handle.net/10722/71235
ISSN
2015 Impact Factor: 0.532
2015 SCImago Journal Rankings: 0.315
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, JJen_HK
dc.contributor.authorLi, XYen_HK
dc.date.accessioned2010-09-06T06:30:09Z-
dc.date.available2010-09-06T06:30:09Z-
dc.date.issued2006en_HK
dc.identifier.citationWater Science And Technology: Water Supply, 2006, v. 6 n. 1, p. 79-86en_HK
dc.identifier.issn1606-9749en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71235-
dc.description.abstractOutfall discharge to seawater is generally used as a practical means of wastewater disposal in many coastal cities. However, deposition of solid pollutants from the wastewater on the seabed would affect the benthic communities. In the present study, both laboratory experiments and numerical simulations were carried out on the role of particle coagulation in the transport and sedimentation of sewage solid materials in marine waters after outfall discharge. Actual sewage samples were collected from two treatment plants in Hong Kong for the experimental study. A flocculator-imaging system was developed for characterization of the particle size distribution (PSD) dynamics during flocculation and dilution of sewage particles in seawater. The system consisted of an external flow-through cell, a microscopic CCD video recorder and an image analyzer. The laboratory results demonstrated that coagulation played an important role in regulating the transport of solid pollutants in marine waters. Flocculation of 30-45 min could shift the PSD considerably, transforming small particles to larger, fast-settling particle aggregates. With a growth in particle size by flocculation, the average settling velocity of the sewage particulates increased by a factor of 2 or more. In addition to the laboratory study, a mathematical model was developed to simulate the transport dynamic of wastewater particles in seawater after outfall discharge. The results of numerical simulations compared well with the experimental observations. Both laboratory and simulation results suggest the important role of coagulation in the transport and sedimentation dynamics of sewage particles in marine waters, especially in the early phase of outfall discharge. As a result, suspended solids from the wastewater discharge would deposit more closely in the vicinity of the outfall sites. © IWA Publishing 2006.en_HK
dc.languageengen_HK
dc.publisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwst_wsen_HK
dc.relation.ispartofWater Science and Technology: Water Supplyen_HK
dc.subjectCoagulationen_HK
dc.subjectFlocculationen_HK
dc.subjectNumerical simulationen_HK
dc.subjectOutfallen_HK
dc.subjectParticleen_HK
dc.subjectSedimentationen_HK
dc.subjectSewageen_HK
dc.titleCoagulation and sedimentation of particulate pollutants in marine waters after wastewater outfall dischargeen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1606-9749&volume=6&issue=1&spage=79&epage=86&date=2006&atitle=Coagulation+and+sedimentation+of+particulate+pollutants+in+marine+waters+after+wastewater+outfall+dischargeen_HK
dc.identifier.emailLi, XY:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2166/ws.2006.009en_HK
dc.identifier.scopuseid_2-s2.0-33744485803en_HK
dc.identifier.hkuros125587en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33744485803&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume6en_HK
dc.identifier.issue1en_HK
dc.identifier.spage79en_HK
dc.identifier.epage86en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhang, JJ=13807914500en_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK

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