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Article: Formation of interim by-products in methanogenic degradation of butyrate

TitleFormation of interim by-products in methanogenic degradation of butyrate
Authors
KeywordsButyrate
By-products
Caproate
Formate
Free-energy
Hydrogen
Methanogenesis
Propionate
Valerate
Issue Date1999
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 1999, v. 33 n. 8, p. 1791-1798 How to Cite?
AbstractThe formation of interim by-products during the methanogenic degradation of butyrate was monitored and analyzed in this study. Two series of experiments were conducted at various butyrate concentrations and under the influence of increased partial pressure of hydrogen (P(H2)). In all batches, acetate was found most abundant in the mixed liquor, accounting for over 52-83% of carbon in the original butyrate. This confirms that the degradation of butyrate was through acetate by β-oxidation, and the rate of butyrotrophic acetogenesis was considerably higher than that of acetotrophic methanogenesis. Assuming the degradation followed the Monod equation, the maximum-rate constant μ(max) was found in the range of 3.4-6.0 mg (mg VSS d)-1 and the half-rate concentration K(s) was 700-1150 mg l-1. Other interim by-products included hydrogen (up to 10-3.8 atm), propionate (up to 25 mg l-1), i-butyrate (up to 780 mg l-1), and several higher-molecular-weight carboxylic acids (up to 21 mg l-1). All these by-products became fully degraded eventually after reaching the maximum levels, except propionate which remained at the peak concentration. This suggests that the butyrate-degrading sludge was incapable of degrading propionate. Addition of formate to the feed solution increased the P(H2), which enhanced the formation of propionate but did not affect butyrate degradation. The effect of P(H2) on propionate was in accordance with the chemical energy analysis. The chemical energy analysis also suggests that the formation of caproate, one of the higher-molecular-weight acids, was independent of the increase of P(H2). | The formation of interim by-products during the methanogenic degradation of butyrate was monitored and analyzed in this study. Two series of experiments were conducted at various butyrate concentrations and under the influence of increased partial pressure of hydrogen (PH(2)). In all batches, acetate was found most abundant in the mixed liquor, accounting for over 52-83% of carbon in the original butyrate. This confirms that the degradation of butyrate was through acetate by β-oxidation, and the rate of butyrotrophic acetogenesis was considerably higher than that of acetotrophic methanogenesis. Assuming the degradation followed the Monod equation, the maximum-rate constant μmax was found in the range of 3.4-6.0 mg (mg VSS d)-1 and the half-rate concentration Ks was 700-1150 mg l-1. Other interim by-products included hydrogen (up to 10-3.8 atm), propionate (up to 25 mg l-1), i-butyrate (up to 780 mg l-1), and several higher-molecular-weight carboxylic acids (up to 21 mg l-1). All these by-products became fully degraded eventually after reaching the maximum levels, except propionate which remained at the peak concentration. This suggests that the butyrate-degrading sludge was incapable of degrading propionate. Addition of formate to the feed solution increased the PH(2), which enhanced the formation of propionate but did not affect butyrate degradation. The effect of PH(2) on propionate was in accordance with the chemical energy analysis. The chemical energy analysis also suggests that the formation of caproate, one of the higher-molecular-weight acids, was independent of the increase of PH(2).
Persistent Identifierhttp://hdl.handle.net/10722/70950
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorFang, HHPen_HK
dc.contributor.authorJia, XSen_HK
dc.date.accessioned2010-09-06T06:27:33Z-
dc.date.available2010-09-06T06:27:33Z-
dc.date.issued1999en_HK
dc.identifier.citationWater Research, 1999, v. 33 n. 8, p. 1791-1798en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70950-
dc.description.abstractThe formation of interim by-products during the methanogenic degradation of butyrate was monitored and analyzed in this study. Two series of experiments were conducted at various butyrate concentrations and under the influence of increased partial pressure of hydrogen (P(H2)). In all batches, acetate was found most abundant in the mixed liquor, accounting for over 52-83% of carbon in the original butyrate. This confirms that the degradation of butyrate was through acetate by β-oxidation, and the rate of butyrotrophic acetogenesis was considerably higher than that of acetotrophic methanogenesis. Assuming the degradation followed the Monod equation, the maximum-rate constant μ(max) was found in the range of 3.4-6.0 mg (mg VSS d)-1 and the half-rate concentration K(s) was 700-1150 mg l-1. Other interim by-products included hydrogen (up to 10-3.8 atm), propionate (up to 25 mg l-1), i-butyrate (up to 780 mg l-1), and several higher-molecular-weight carboxylic acids (up to 21 mg l-1). All these by-products became fully degraded eventually after reaching the maximum levels, except propionate which remained at the peak concentration. This suggests that the butyrate-degrading sludge was incapable of degrading propionate. Addition of formate to the feed solution increased the P(H2), which enhanced the formation of propionate but did not affect butyrate degradation. The effect of P(H2) on propionate was in accordance with the chemical energy analysis. The chemical energy analysis also suggests that the formation of caproate, one of the higher-molecular-weight acids, was independent of the increase of P(H2). | The formation of interim by-products during the methanogenic degradation of butyrate was monitored and analyzed in this study. Two series of experiments were conducted at various butyrate concentrations and under the influence of increased partial pressure of hydrogen (PH(2)). In all batches, acetate was found most abundant in the mixed liquor, accounting for over 52-83% of carbon in the original butyrate. This confirms that the degradation of butyrate was through acetate by β-oxidation, and the rate of butyrotrophic acetogenesis was considerably higher than that of acetotrophic methanogenesis. Assuming the degradation followed the Monod equation, the maximum-rate constant μmax was found in the range of 3.4-6.0 mg (mg VSS d)-1 and the half-rate concentration Ks was 700-1150 mg l-1. Other interim by-products included hydrogen (up to 10-3.8 atm), propionate (up to 25 mg l-1), i-butyrate (up to 780 mg l-1), and several higher-molecular-weight carboxylic acids (up to 21 mg l-1). All these by-products became fully degraded eventually after reaching the maximum levels, except propionate which remained at the peak concentration. This suggests that the butyrate-degrading sludge was incapable of degrading propionate. Addition of formate to the feed solution increased the PH(2), which enhanced the formation of propionate but did not affect butyrate degradation. The effect of PH(2) on propionate was in accordance with the chemical energy analysis. The chemical energy analysis also suggests that the formation of caproate, one of the higher-molecular-weight acids, was independent of the increase of PH(2).en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.subjectButyrateen_HK
dc.subjectBy-productsen_HK
dc.subjectCaproateen_HK
dc.subjectFormateen_HK
dc.subjectFree-energyen_HK
dc.subjectHydrogenen_HK
dc.subjectMethanogenesisen_HK
dc.subjectPropionateen_HK
dc.subjectValerateen_HK
dc.titleFormation of interim by-products in methanogenic degradation of butyrateen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=33 &issue=8&spage=1791 &epage= 1798&date=1999&atitle=Formation+of+interim+by-products+in+methanogenic+degradation+of+butyrateen_HK
dc.identifier.emailFang, HHP:hrechef@hkucc.hku.hken_HK
dc.identifier.authorityFang, HHP=rp00115en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0043-1354(98)00409-6en_HK
dc.identifier.scopuseid_2-s2.0-0033151270en_HK
dc.identifier.hkuros51641en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033151270&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue8en_HK
dc.identifier.spage1791en_HK
dc.identifier.epage1798en_HK
dc.identifier.isiWOS:000080017200005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridFang, HHP=7402542625en_HK
dc.identifier.scopusauthoridJia, XS=7201933791en_HK

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