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Article: Acidogenesis of dairy wastewater at various pH levels

TitleAcidogenesis of dairy wastewater at various pH levels
Authors
Issue Date2002
PublisherIWA Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwst
Citation
Water Science And Technology, 2002, v. 45 n. 10, p. 201-206 How to Cite?
AbstractContinuous experiments were conducted to study the influence of pH in the range 4.0-6.5 on the acidification of dairy wastewater at 37 degrees C with 12 hours of hydraulic retention in an upflow reactor. Results showed that degradation of dairy pollutants increased with pH from pH 4.0 to 5.5. At pH 5.5, 95% of carbohydrate, 82% of protein and 41% of lipid were degraded. Based on chemical oxygen demand (COD), 48.4% of dairy pollutants were converted into volatile fatty acids and alcohols in the mixed liquor, 6.1% into hydrogen and methane in biogas, and the remaining 4.9% into biomass. The biomass yield at pH 5.5 was estimated as 0.32 mg-VSS/mg-COD. Further increase of pH, up to 6.5, increased degradation of carbohydrate, protein and lipid only slightly, but resulted in the lowering of overall acid and alcohol production due to their increased conversion into methane. Acetate, propionate, butyrate and ethanol are the main products of acidogenesis. Productions of propionate and ethanol were favored at pH 4.0-4.5, whereas productions of acetate and butyrate were favored at pH 6.0-6.5.
Persistent Identifierhttp://hdl.handle.net/10722/150202
ISSN
2015 Impact Factor: 1.064
2015 SCImago Journal Rankings: 0.469
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYu, HGen_US
dc.contributor.authorFang, HHen_US
dc.date.accessioned2012-06-26T06:02:14Z-
dc.date.available2012-06-26T06:02:14Z-
dc.date.issued2002en_US
dc.identifier.citationWater Science And Technology, 2002, v. 45 n. 10, p. 201-206en_US
dc.identifier.issn0273-1223en_US
dc.identifier.urihttp://hdl.handle.net/10722/150202-
dc.description.abstractContinuous experiments were conducted to study the influence of pH in the range 4.0-6.5 on the acidification of dairy wastewater at 37 degrees C with 12 hours of hydraulic retention in an upflow reactor. Results showed that degradation of dairy pollutants increased with pH from pH 4.0 to 5.5. At pH 5.5, 95% of carbohydrate, 82% of protein and 41% of lipid were degraded. Based on chemical oxygen demand (COD), 48.4% of dairy pollutants were converted into volatile fatty acids and alcohols in the mixed liquor, 6.1% into hydrogen and methane in biogas, and the remaining 4.9% into biomass. The biomass yield at pH 5.5 was estimated as 0.32 mg-VSS/mg-COD. Further increase of pH, up to 6.5, increased degradation of carbohydrate, protein and lipid only slightly, but resulted in the lowering of overall acid and alcohol production due to their increased conversion into methane. Acetate, propionate, butyrate and ethanol are the main products of acidogenesis. Productions of propionate and ethanol were favored at pH 4.0-4.5, whereas productions of acetate and butyrate were favored at pH 6.0-6.5.en_US
dc.languageengen_US
dc.publisherIWA Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwsten_US
dc.relation.ispartofWater Science and Technologyen_US
dc.subject.meshAcids - Analysisen_US
dc.subject.meshAgricultureen_US
dc.subject.meshAnimalsen_US
dc.subject.meshBiomassen_US
dc.subject.meshBioreactorsen_US
dc.subject.meshCattleen_US
dc.subject.meshFatty Acids - Analysisen_US
dc.subject.meshHydrogen-Ion Concentrationen_US
dc.subject.meshVolatilizationen_US
dc.subject.meshWaste Disposal, Fluid - Methodsen_US
dc.titleAcidogenesis of dairy wastewater at various pH levelsen_US
dc.typeArticleen_US
dc.identifier.emailFang, HH:hrechef@hkucc.hku.hken_US
dc.identifier.authorityFang, HH=rp00115en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.pmid12188545-
dc.identifier.scopuseid_2-s2.0-0036044089en_US
dc.identifier.hkuros67251-
dc.identifier.volume45en_US
dc.identifier.issue10en_US
dc.identifier.spage201en_US
dc.identifier.epage206en_US
dc.identifier.isiWOS:000177331900032-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridYu, HG=7405855195en_US
dc.identifier.scopusauthoridFang, HH=7402542625en_US

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