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Article: Use of limestone for pH control in autotrophic denitrification: Batch experiments

TitleUse of limestone for pH control in autotrophic denitrification: Batch experiments
Authors
KeywordsAlkalinity
Autotrophic denitrification
Limestone dissolution
Nitrate removal
pH control
Sulphur/limestone reactor
Issue Date2002
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/procbio
Citation
Process Biochemistry, 2002, v. 37 n. 8, p. 885-893 How to Cite?
AbstractThe autotrophic denitrification process using elemental sulphur consumes about 4 g alkalinity (as CaCO3) per gram nitrate nitrogen reduced and is severely inhibited at pH lower than 5.5. Using limestone as an alkalinity source to control the pH, the autotrophic denitrification of synthetic wastewater with varying initial alkalinity to NO3-N ratios was evaluated in laboratory-scale batch reactors, which contained sulphur and limestone granules in different volumetric ratios. The results demonstrated that limestone supplies effective buffering capacity, if the initial alkalinity is insufficient for complete denitrification. The alkalinity supplied by limestone is a function of the pH, which in turn depends on the initial alkalinity of the wastewater and the extent of the biological denitrification. Given the specific denitrification rates, in mg NO3-N/g S h, and limestone dissolution rates, in mg CaCO3/g CaCO3 h, as a function of pH, the required volumetric ratio of limestone to sulphur for maintaining a given pH can be quantitatively established. It was found that the optimum volumetric ratio of limestone to sulphur for minimization of the reactor volume equals approximately 1:1. © 2002 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/71580
ISSN
2015 Impact Factor: 2.529
2015 SCImago Journal Rankings: 0.937
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, LHen_HK
dc.contributor.authorKoenig, Aen_HK
dc.date.accessioned2010-09-06T06:33:17Z-
dc.date.available2010-09-06T06:33:17Z-
dc.date.issued2002en_HK
dc.identifier.citationProcess Biochemistry, 2002, v. 37 n. 8, p. 885-893en_HK
dc.identifier.issn1359-5113en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71580-
dc.description.abstractThe autotrophic denitrification process using elemental sulphur consumes about 4 g alkalinity (as CaCO3) per gram nitrate nitrogen reduced and is severely inhibited at pH lower than 5.5. Using limestone as an alkalinity source to control the pH, the autotrophic denitrification of synthetic wastewater with varying initial alkalinity to NO3-N ratios was evaluated in laboratory-scale batch reactors, which contained sulphur and limestone granules in different volumetric ratios. The results demonstrated that limestone supplies effective buffering capacity, if the initial alkalinity is insufficient for complete denitrification. The alkalinity supplied by limestone is a function of the pH, which in turn depends on the initial alkalinity of the wastewater and the extent of the biological denitrification. Given the specific denitrification rates, in mg NO3-N/g S h, and limestone dissolution rates, in mg CaCO3/g CaCO3 h, as a function of pH, the required volumetric ratio of limestone to sulphur for maintaining a given pH can be quantitatively established. It was found that the optimum volumetric ratio of limestone to sulphur for minimization of the reactor volume equals approximately 1:1. © 2002 Elsevier Science Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/procbioen_HK
dc.relation.ispartofProcess Biochemistryen_HK
dc.rightsProcess Biochemistry. Copyright © Elsevier Ltd.en_HK
dc.subjectAlkalinityen_HK
dc.subjectAutotrophic denitrificationen_HK
dc.subjectLimestone dissolutionen_HK
dc.subjectNitrate removalen_HK
dc.subjectpH controlen_HK
dc.subjectSulphur/limestone reactoren_HK
dc.titleUse of limestone for pH control in autotrophic denitrification: Batch experimentsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1359-5113&volume=37&issue=8&spage=885 &epage= 893&date=2002&atitle=Use+of+limestone+for+pH+control+in+autotrophic+denitrification:+Batch+experimentsen_HK
dc.identifier.emailKoenig, A:kalbert@hkucc.hku.hken_HK
dc.identifier.authorityKoenig, A=rp00125en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0032-9592(01)00302-8en_HK
dc.identifier.scopuseid_2-s2.0-0036177869en_HK
dc.identifier.hkuros66525en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036177869&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume37en_HK
dc.identifier.issue8en_HK
dc.identifier.spage885en_HK
dc.identifier.epage893en_HK
dc.identifier.isiWOS:000174514600012-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLiu, LH=23980547100en_HK
dc.identifier.scopusauthoridKoenig, A=7103178143en_HK

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