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Article: UASB treatment of wastewater with concentrated mixed VFA

TitleUASB treatment of wastewater with concentrated mixed VFA
Authors
Issue Date1995
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/ee.html
Citation
Journal Of Environmental Engineering, 1995, v. 121 n. 2, p. 153-160 How to Cite?
AbstractThe upflow anaerobic-sludge blanket (UASB) process consistently removed 97-99% of chemical oxygen demand (COD) from wastewater containing concentrated mixed volatile fatty acids (VFA) at 37Γ at loading rates of up to 24 g-COD/(L · d), corresponding to a food/microorganism ratio of 0.78 g- COD/[g-volatile suspended solids (VSS) · d]. It suggested that, with preacidification, the UASB process can be effective for a wide variety of wastewaters. The COD removal efficiency deteriorated at higher loading rates; there was no butyrate in the effluent, suggesting that buryrate degradation was not a rate-limiting step. Of the COD removed, 92.6% was converted to methane; the rest was converted to granular biomass with an average yield of 0.054 g-VSS/g-COD. The granules had a size of 1-2 mm and settled satisfactorily. Each gram of granule in the reactor was capable of converting a daily maximum of 0.86 g of COD into methane. The granules had a fluffy surface mostly composed of interwound filamentous Methanothrix-like bacteria. Syntrophic associations between Methanothrix-, Methanospirillum hungatei-, and Syntrophobacter-like bacteria were prevalent in the granule interior. The syntrophic relation between these species was elucidated by thermodynamics. | The upflow anaerobic-sludge blanket (UASB) process consistently removed 97-99% of chemical oxygen demand (COD) from wastewater containing concentrated mixed volatile fatty acids (VFA) at 37 °C at loading rates of up to 24 g-COD/(L·d), corresponding to a food/microorganism ratio of 0.78 g-COD/[g-volatile suspended solids (VSS)·d]. It suggested that, with preacidification, the UASB process can be effective for a wide variety of wastewaters. The COD removal efficiency deteriorated at higher loading rates; there was no butyrate in the effluent, suggesting that butyrate degradation was not a rate-limiting step. Of the COD removed, 92.6% was converted to methane; the rest was converted to granular biomass with an average yield of 0.054 g-VSS/g-COD. The granules had a size of 1-2 mm and settled satisfactorily. Each gram of granule in the reactor was capable of converting a daily maximum of 0.86 g of COD into methane. The granules had a fluffy surface mostly composed of interwound filamentous Methanothrix-like bacteria. Syntrophic associations between Methanothrix-, Methanospirillum hungatei-, and Syntrophobacter-like bacteria were prevalent in the granule interior. The syntrophic relation between these species was elucidated by thermodynamics.
Persistent Identifierhttp://hdl.handle.net/10722/70647
ISSN
2015 Impact Factor: 1.125
2015 SCImago Journal Rankings: 0.462
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorFang, HHPen_HK
dc.contributor.authorYu You Lien_HK
dc.contributor.authorHo Kwong Chuien_HK
dc.date.accessioned2010-09-06T06:24:51Z-
dc.date.available2010-09-06T06:24:51Z-
dc.date.issued1995en_HK
dc.identifier.citationJournal Of Environmental Engineering, 1995, v. 121 n. 2, p. 153-160en_HK
dc.identifier.issn0733-9372en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70647-
dc.description.abstractThe upflow anaerobic-sludge blanket (UASB) process consistently removed 97-99% of chemical oxygen demand (COD) from wastewater containing concentrated mixed volatile fatty acids (VFA) at 37Γ at loading rates of up to 24 g-COD/(L · d), corresponding to a food/microorganism ratio of 0.78 g- COD/[g-volatile suspended solids (VSS) · d]. It suggested that, with preacidification, the UASB process can be effective for a wide variety of wastewaters. The COD removal efficiency deteriorated at higher loading rates; there was no butyrate in the effluent, suggesting that buryrate degradation was not a rate-limiting step. Of the COD removed, 92.6% was converted to methane; the rest was converted to granular biomass with an average yield of 0.054 g-VSS/g-COD. The granules had a size of 1-2 mm and settled satisfactorily. Each gram of granule in the reactor was capable of converting a daily maximum of 0.86 g of COD into methane. The granules had a fluffy surface mostly composed of interwound filamentous Methanothrix-like bacteria. Syntrophic associations between Methanothrix-, Methanospirillum hungatei-, and Syntrophobacter-like bacteria were prevalent in the granule interior. The syntrophic relation between these species was elucidated by thermodynamics. | The upflow anaerobic-sludge blanket (UASB) process consistently removed 97-99% of chemical oxygen demand (COD) from wastewater containing concentrated mixed volatile fatty acids (VFA) at 37 °C at loading rates of up to 24 g-COD/(L·d), corresponding to a food/microorganism ratio of 0.78 g-COD/[g-volatile suspended solids (VSS)·d]. It suggested that, with preacidification, the UASB process can be effective for a wide variety of wastewaters. The COD removal efficiency deteriorated at higher loading rates; there was no butyrate in the effluent, suggesting that butyrate degradation was not a rate-limiting step. Of the COD removed, 92.6% was converted to methane; the rest was converted to granular biomass with an average yield of 0.054 g-VSS/g-COD. The granules had a size of 1-2 mm and settled satisfactorily. Each gram of granule in the reactor was capable of converting a daily maximum of 0.86 g of COD into methane. The granules had a fluffy surface mostly composed of interwound filamentous Methanothrix-like bacteria. Syntrophic associations between Methanothrix-, Methanospirillum hungatei-, and Syntrophobacter-like bacteria were prevalent in the granule interior. The syntrophic relation between these species was elucidated by thermodynamics.en_HK
dc.languageengen_HK
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/ee.htmlen_HK
dc.relation.ispartofJournal of Environmental Engineeringen_HK
dc.rightsJournal of Environmental Engineering. Copyright © American Society of Civil Engineers.en_HK
dc.titleUASB treatment of wastewater with concentrated mixed VFAen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9372&volume=121&issue=2&spage=153&epage=160&date=1995&atitle=UASB+treatment+of+wastewater+with+concentrated+mixed+VFAen_HK
dc.identifier.emailFang, HHP:hrechef@hkucc.hku.hken_HK
dc.identifier.authorityFang, HHP=rp00115en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1061/(ASCE)0733-9372(1995)121:2(153)en_HK
dc.identifier.scopuseid_2-s2.0-0029239877en_HK
dc.identifier.hkuros641en_HK
dc.identifier.volume121en_HK
dc.identifier.issue2en_HK
dc.identifier.spage153en_HK
dc.identifier.epage160en_HK
dc.identifier.isiWOS:A1995QC37300004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridFang, HHP=7402542625en_HK
dc.identifier.scopusauthoridYu You Li=7409734527en_HK
dc.identifier.scopusauthoridHo Kwong Chui=7409847937en_HK

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