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
2011 Impact Factor: 1.122
2011 SCImago Journal Rankings: 0.067
DOIhttp://dx.doi.org/10.2166/wst.2006.716
ISI Accession Number IDWOS:000242677200021
ReferencesReferences in Scopus
DC Field
Value
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
2011 Impact Factor: 1.122
2011 SCImago Journal Rankings: 0.067
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
Author Affiliations
  1. The University of Hong Kong