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Conference Paper: Nitrogen removal from the saline sludge liquor by electrochemical denitrification
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TitleNitrogen removal from the saline sludge liquor by electrochemical denitrification
 
AuthorsXie, ZM1
Li, XY1
Chan, KY1
 
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
 
CitationWater Science And Technology, 2006, v. 54 n. 8, p. 171-179 [How to Cite?]
DOI: http://dx.doi.org/10.2166/wst.2006.716
 
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.
 
ISSN0273-1223
2013 Impact Factor: 1.212
2013 SCImago Journal Rankings: 0.600
 
DOIhttp://dx.doi.org/10.2166/wst.2006.716
 
ISI Accession Number IDWOS:000242677200021
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorXie, ZM
 
dc.contributor.authorLi, XY
 
dc.contributor.authorChan, KY
 
dc.date.accessioned2010-09-06T06:11:13Z
 
dc.date.available2010-09-06T06:11:13Z
 
dc.date.issued2006
 
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.
 
dc.description.naturepostprint
 
dc.identifier.citationWater Science And Technology, 2006, v. 54 n. 8, p. 171-179 [How to Cite?]
DOI: http://dx.doi.org/10.2166/wst.2006.716
 
dc.identifier.doihttp://dx.doi.org/10.2166/wst.2006.716
 
dc.identifier.epage179
 
dc.identifier.hkuros134740
 
dc.identifier.isiWOS:000242677200021
 
dc.identifier.issn0273-1223
2013 Impact Factor: 1.212
2013 SCImago Journal Rankings: 0.600
 
dc.identifier.issue8
 
dc.identifier.openurl
 
dc.identifier.pmid17163026
 
dc.identifier.scopuseid_2-s2.0-33845287686
 
dc.identifier.spage171
 
dc.identifier.urihttp://hdl.handle.net/10722/69172
 
dc.identifier.volume54
 
dc.languageeng
 
dc.publisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwst
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofWater Science and Technology
 
dc.relation.referencesReferences in Scopus
 
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.subject.meshBioreactors
 
dc.subject.meshElectrochemistry
 
dc.subject.meshNitrogen - chemistry - metabolism
 
dc.subject.meshSewage - chemistry - microbiology
 
dc.subject.meshWaste Disposal, Fluid - instrumentation - methods
 
dc.subjectDenitrification
 
dc.subjectElectrochemical
 
dc.subjectSludge liquor treatment
 
dc.subjectWastewater treatment
 
dc.titleNitrogen removal from the saline sludge liquor by electrochemical denitrification
 
dc.typeConference_Paper
 
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Author Affiliations
  1. The University of Hong Kong