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Conference Paper: Nitrogen removal from the saline sludge liquor by electrochemical denitrification

TitleNitrogen removal from the saline sludge liquor by electrochemical denitrification
Authors
KeywordsDenitrification
Electrochemical
Sludge liquor treatment
Wastewater treatment
Issue Date2006
PublisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwst
Citation
Water Science And Technology, 2006, v. 54 n. 8, p. 171-179 How to Cite?
AbstractSludge liquor from the sludge dewatering process has a high ammonia content. In the present study, a lab-scale electrochemical (EC) system with a pair of Ti electrode plates was used for treating the sludge centrate liquor of digested wastewater sludge with a NH4 + - N content of around 500 mg/L. The sludge liquor had a high salinity due to seawater being used for toilet flushing in Hong Kong. The results show that the EC process is highly effective for denitrification of the saline sludge liquor. Complete nitroger removal could be achieved within 1 hr or so. The rate of EC denitrification increased with the current intensity applied. The best current efficiency for nitrogen removal was obtained for a gap distance between the electrodes at 8 mm. Electro-chlorination was considered to be the major mechanism of EC denitrification. The formation of chlorination by-products (CBPs) appeared to be minimal with the total trihalomethanes (THM) detected at a level of 300 μg/L or lower. The power consumption for EC denitrification was around 23 kWh/kg N. Additional electro-flocculation with a pair of iron needle electrodes could enhance the flocculation and subsequent sedimentation of colloidal organics in the sludge liquor, increasing the organic removal from less than 30% to more than 70%. Therefore, the EC process including both electro-denitrification and electro-flocculation can be developed as the most cost-effective method for treatment of the saline sludqe liquor. © IWA Publishing 2006.
Persistent Identifierhttp://hdl.handle.net/10722/69172
ISSN
2014 Impact Factor: 1.106
2013 SCImago Journal Rankings: 0.600
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXie, ZMen_HK
dc.contributor.authorLi, XYen_HK
dc.contributor.authorChan, KYen_HK
dc.date.accessioned2010-09-06T06:11:13Z-
dc.date.available2010-09-06T06:11:13Z-
dc.date.issued2006en_HK
dc.identifier.citationWater Science And Technology, 2006, v. 54 n. 8, p. 171-179en_HK
dc.identifier.issn0273-1223en_HK
dc.identifier.urihttp://hdl.handle.net/10722/69172-
dc.description.abstractSludge liquor from the sludge dewatering process has a high ammonia content. In the present study, a lab-scale electrochemical (EC) system with a pair of Ti electrode plates was used for treating the sludge centrate liquor of digested wastewater sludge with a NH4 + - N content of around 500 mg/L. The sludge liquor had a high salinity due to seawater being used for toilet flushing in Hong Kong. The results show that the EC process is highly effective for denitrification of the saline sludge liquor. Complete nitroger removal could be achieved within 1 hr or so. The rate of EC denitrification increased with the current intensity applied. The best current efficiency for nitrogen removal was obtained for a gap distance between the electrodes at 8 mm. Electro-chlorination was considered to be the major mechanism of EC denitrification. The formation of chlorination by-products (CBPs) appeared to be minimal with the total trihalomethanes (THM) detected at a level of 300 μg/L or lower. The power consumption for EC denitrification was around 23 kWh/kg N. Additional electro-flocculation with a pair of iron needle electrodes could enhance the flocculation and subsequent sedimentation of colloidal organics in the sludge liquor, increasing the organic removal from less than 30% to more than 70%. Therefore, the EC process including both electro-denitrification and electro-flocculation can be developed as the most cost-effective method for treatment of the saline sludqe liquor. © 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=iwapwsten_HK
dc.relation.ispartofWater Science and Technologyen_HK
dc.rightsWater Science and Technology. Copyright © I W A Publishing.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rights©IWA Publishing 2006. The definitive peer-reviewed and edited version of this article is published in Water Science and Technology, 2006, v. 54 n. 8, p. 171-179; DOI: 10.2166/wst.2006.716 and is available at www.iwapublishing.com-
dc.subjectDenitrificationen_HK
dc.subjectElectrochemicalen_HK
dc.subjectSludge liquor treatmenten_HK
dc.subjectWastewater treatmenten_HK
dc.subject.meshBioreactors-
dc.subject.meshElectrochemistry-
dc.subject.meshNitrogen - chemistry - metabolism-
dc.subject.meshSewage - chemistry - microbiology-
dc.subject.meshWaste Disposal, Fluid - instrumentation - methods-
dc.titleNitrogen removal from the saline sludge liquor by electrochemical denitrificationen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0273-1223&volume=54&issue=8&spage=171&epage=179&date=2006&atitle=Nitrogen+removal+from+the+saline+sludge+liquor+by+electrochemical+denitrificationen_HK
dc.identifier.emailLi, XY:xlia@hkucc.hku.hken_HK
dc.identifier.emailChan, KY:hrsccky@hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.identifier.authorityChan, KY=rp00662en_HK
dc.description.naturepostprint-
dc.identifier.doi10.2166/wst.2006.716en_HK
dc.identifier.pmid17163026en_HK
dc.identifier.scopuseid_2-s2.0-33845287686en_HK
dc.identifier.hkuros134740en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33845287686&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume54en_HK
dc.identifier.issue8en_HK
dc.identifier.spage171en_HK
dc.identifier.epage179en_HK
dc.identifier.isiWOS:000242677200021-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridXie, ZM=36055453500en_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridChan, KY=7406034142en_HK

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