Non-thermal plasma and ultrasound-assisted open lactic acid fermentation of distillery stillage

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dc.citation.issue35
dc.citation.rankM22
dc.citation.spage35543
dc.citation.volume26
dc.contributor.authorĐukić-Vuković, Aleksandra
dc.contributor.authorLazović, Saša
dc.contributor.authorMladenović, Dragana
dc.contributor.authorKnežević-Jugović, Zorica
dc.contributor.authorPejin, Jelena
dc.contributor.authorMojović, Ljiljana
dc.date.accessioned2024-06-26T13:44:09Z
dc.date.available2024-06-26T13:44:09Z
dc.date.issued2019-04-04
dc.description.abstractStillage is the main by-product of bioethanol production and the cost of its treatment significantly affects the economy of bioethanol production. A process of thermal sterilization before lactic acid fermentation (LAF) is energy demanding and is causing deterioration of valuable compounds in stillage. In this study, ultrasound (UT) and plasma (PT) treatments were used for microbial inactivation, and a significant reduction in the number of viable microorganisms in the stillage after PT and UT was observed. After application of treatment, LAF by Lactobacillus rhamnosus ATCC 7469 was initiated. The concentration of LA is used to quantify the efficiency of the stillage revalorization. The highest LA productivity of 1.21 g/Lh and yield of 0.82 g/g were obtained after PT, while UT of 10 min provided productivity of 1.02 g/Lh and LA yield of 0.69 g/g. The results were benchmarked against closed LAF. Around 20% better revalorization of stillage by PT was achieved when compared with conventional sterilization. In addition, an excellent L (+) LA stereoselectivity of 95.5% was attained after PT. From the aspect of energy efficiency, that of PT was three times lower than UT and almost ten times lower than thermal sterilization, but it is the most expensive due to the high consumption of gas which could reduce application of closed Ar atmosphere on larger scales. This way, a simpler and energy efficient process for LA production on stillage was accomplished by “open” fermentation.
dc.identifier.doi10.1007/s11356-019-04894-9
dc.identifier.issn0944-1344
dc.identifier.issn1614-7499
dc.identifier.scopus2-s2.0-85072189191
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/153
dc.identifier.wos000507276300025
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofEnvironmental Science and Pollution Research
dc.relation.ispartofabbrEnviron. Sci. Pollut. Res.
dc.rightsrestrictedAccess
dc.titleNon-thermal plasma and ultrasound-assisted open lactic acid fermentation of distillery stillage
dc.typeArticle
dc.type.versionpublishedVersion
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