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Article: Effect of temperature shock to thermophilic granules

TitleEffect of temperature shock to thermophilic granules
Authors
KeywordsAnaerobic
Biogranule
Shock
SMA
Temperature
Thermophilic
UASB
Issue Date1997
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 1997, v. 31 n. 10, p. 2626-2632 How to Cite?
AbstractEffects of temperature shock to the activity of thermophilic biogranules in two upflow anaerobic sludge blanket (UASB) reactors were investigated, Treating wastewater containing 9450 mg litre-1 of sucrose, equivalent to 10000 mg litre-1 of COD (chemical oxygen demand) at 55°C and 24 h of hydraulic retention time (corresponding to a loading rate of 10 g-COD litre-1 day-1, both reactors consistently removed 85-90% of COD. The temperature in Reactor-I was raised to 65°C for 8 days, while that in Reactor-D was lowered to 37°C for 16 days. The temperature shocks significantly reduced the reactors' performance: COD removal efficiencies were lowered to 60% for Reactor-I and to, only 40% for Reactor-D. Sludge yields during temperature shock were lowered by 25%. In addition, the temperature shock also caused severe biomass washout, lowering of pH and accumulation of fatty acids, in particular propionate, However, both reactors were able to fully recover their efficiencies within 18 days, after the pH was rectified by the addition of alkaline and the temperature was re-adjusted to the normal 55°C. Results of specific methanogenic activity (SMA) tests show that acetotrophic methanogens were not as sensitive to the temperature shock as other bacteria. | Effects of temperature shock to the activity of thermophilic biogranules in two upflow anaerobic sludge blanket (UASB) reactors were investigated. Treating wastewater containing 9450 mg litre-1 of sucrose, equivalent to 10000 mg litre-1 of COD (chemical oxygen demand) at 55 °C and 24 h of hydraulic retention time (corresponding to a loading rate of 10 g-COD litre-1 day-1 both reactors consistently removed 85-90% of COD. The temperature in Reactor-I was raised to 65 °C for 8 days, while that in Reactor-D was lowered to 37 °C for 16 days. The temperature shocks significantly reduced the reactors' performance: COD removal efficiencies were lowered to 60% for Reactor-I and to only 40% for Reactor-D. Sludge yields during temperature shock were lowered by 25%. In addition, the temperature shock also caused severe biomass washout, lowering of pH and accumulation of fatty acids, in particular propionate. However, both reactors were able to fully recover their efficiencies within 18 days, after the pH was rectified by the addition of alkaline and the temperature was re-adjusted to the normal 55 °C. Results of specific methanogenic activity (SMA) tests show that acetotrophic methanogens were not as sensitive to the temperature shock as other bacteria.
Persistent Identifierhttp://hdl.handle.net/10722/70709
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLau, IWCen_HK
dc.contributor.authorFang, HHPen_HK
dc.date.accessioned2010-09-06T06:25:24Z-
dc.date.available2010-09-06T06:25:24Z-
dc.date.issued1997en_HK
dc.identifier.citationWater Research, 1997, v. 31 n. 10, p. 2626-2632en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70709-
dc.description.abstractEffects of temperature shock to the activity of thermophilic biogranules in two upflow anaerobic sludge blanket (UASB) reactors were investigated, Treating wastewater containing 9450 mg litre-1 of sucrose, equivalent to 10000 mg litre-1 of COD (chemical oxygen demand) at 55°C and 24 h of hydraulic retention time (corresponding to a loading rate of 10 g-COD litre-1 day-1, both reactors consistently removed 85-90% of COD. The temperature in Reactor-I was raised to 65°C for 8 days, while that in Reactor-D was lowered to 37°C for 16 days. The temperature shocks significantly reduced the reactors' performance: COD removal efficiencies were lowered to 60% for Reactor-I and to, only 40% for Reactor-D. Sludge yields during temperature shock were lowered by 25%. In addition, the temperature shock also caused severe biomass washout, lowering of pH and accumulation of fatty acids, in particular propionate, However, both reactors were able to fully recover their efficiencies within 18 days, after the pH was rectified by the addition of alkaline and the temperature was re-adjusted to the normal 55°C. Results of specific methanogenic activity (SMA) tests show that acetotrophic methanogens were not as sensitive to the temperature shock as other bacteria. | Effects of temperature shock to the activity of thermophilic biogranules in two upflow anaerobic sludge blanket (UASB) reactors were investigated. Treating wastewater containing 9450 mg litre-1 of sucrose, equivalent to 10000 mg litre-1 of COD (chemical oxygen demand) at 55 °C and 24 h of hydraulic retention time (corresponding to a loading rate of 10 g-COD litre-1 day-1 both reactors consistently removed 85-90% of COD. The temperature in Reactor-I was raised to 65 °C for 8 days, while that in Reactor-D was lowered to 37 °C for 16 days. The temperature shocks significantly reduced the reactors' performance: COD removal efficiencies were lowered to 60% for Reactor-I and to only 40% for Reactor-D. Sludge yields during temperature shock were lowered by 25%. In addition, the temperature shock also caused severe biomass washout, lowering of pH and accumulation of fatty acids, in particular propionate. However, both reactors were able to fully recover their efficiencies within 18 days, after the pH was rectified by the addition of alkaline and the temperature was re-adjusted to the normal 55 °C. Results of specific methanogenic activity (SMA) tests show that acetotrophic methanogens were not as sensitive to the temperature shock as other bacteria.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.subjectAnaerobicen_HK
dc.subjectBiogranuleen_HK
dc.subjectShocken_HK
dc.subjectSMAen_HK
dc.subjectTemperatureen_HK
dc.subjectThermophilicen_HK
dc.subjectUASBen_HK
dc.titleEffect of temperature shock to thermophilic granulesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=31&issue=10&spage=2626 &epage= 2632&date=1997&atitle=Effect+of+temperature+shock+to+thermophilic+granulesen_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(97)00110-3en_HK
dc.identifier.scopuseid_2-s2.0-0031259946en_HK
dc.identifier.hkuros29824en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031259946&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume31en_HK
dc.identifier.issue10en_HK
dc.identifier.spage2626en_HK
dc.identifier.epage2632en_HK
dc.identifier.isiWOS:A1997XZ55400028-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLau, IWC=7006768100en_HK
dc.identifier.scopusauthoridFang, HHP=7402542625en_HK

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