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SM ISO690:2012 COVALIOV, Victor, BOBEICA, Valentin, NENNO, Vladimir, COVALIOVA, Olga. Phyto-chemical intensification of biomethane and biohydrogen formation as “green energy” agents in the anaerobic digestion of agroindustrial waste waters. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 152. |
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The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014 | ||||||
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova" Chișinău, Moldova, 28-30 mai 2014 | ||||||
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The problem of biogas formation and using with high contents in mehtane (CH4) and |
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The problem of biogas formation and using with high contents in mehtane (CH4) and |
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<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Covaliov, V.V.</dc:creator> <dc:creator>Bobeică, V.A.</dc:creator> <dc:creator>Nenno, V.E.</dc:creator> <dc:creator>Covaliova, O.V.</dc:creator> <dc:date>2014</dc:date> <dc:description xml:lang='en'><p>The problem of biogas formation and using with high contents in mehtane (CH4) and<br />hydrogen (H2) as a renewable energy agent is a serious challenge for the experts in various<br />fields, in view to resolve a fundamental ecological-economic component of sustainable<br />development – transition to the renewable energy sources. As it is known, hydrogen emission<br />occurs on the acetogenic phase of the organic matter anaerobic digestion, due to the acetogenic<br />bacteria activity (Methanobacillus omelianskii etc.), splitting the alcohols and greasy acids,<br />which are formed in the hydrocarbons degradation of vegetable matter. The hydrogen emitted is<br />mostly consumed in the methane formation reacton: 4Н2+ СО2 → СН4 + 2Н2О, and is<br />accumulated in biogas. When its quantity exceeds certain concentration (up to 10%) in biogas,<br />the anaerobic fermentation is inhibited. The amount of CH4 in biogas depends on the rate of this<br />Н2 level attaining. This fact is responsible for the technological difficulties in reaching of more<br />than 70% methane in biogas, its amount in most cases being about 60%. The methanogenesis<br />inhibition prevents the further formation of hydrogen.<br />The essence of phyto-chemical intensification of biohydrogen and biomethane formation,<br />presented in this work, consists in the anaerobic fermentation of agro-industrial wastewaters with<br />high contents in digestible organic substances, in the presence of stimulating additives of phytochemical<br />nature. The vinasse resulted from the alcohol distillation from wine material was used<br />as a biomass – a renewable vegetable substrate. The biologically active vegetable substances of<br />isoprenoid nature have been tested as stimulating additives in anaerobic digestion. These<br />substances, being applied in the amounts of 1x10-3- 5x10-4 mass % of a reacting mixture, have<br />either partially inhibited the methane formation, promoting the accumulation of hydrogen in<br />biogas, or have stimulated the methane formation and appropriate increase in methane<br />concentration.<br />Some spirostanolic substances and triterpenic glicozides introduced in the anaerobic<br />digestion mixture, have significantly reoriented the methanogenesis process towards the selective<br />formation of molecular hydrogen. In the presence of mentioned biostimulators, hydrogen<br />contents in the biogas volume on the 12th day of digestion have reached about 40 and 68% for<br />spirostanolic stimulator and triterpenic glicozide, accordingly. The process was shown to be<br />more efficient within the range pH=5.2 ÷7.5 under the mesophylic thermal conditions.<br />The other phyto-chemical compounds of triterpenoid series (squalene, betulinol), being<br />introduced in the agroindustrial waste waters, have intensified the anaerobic digestion in the<br />laboratory tests up to 2-3 times, with the increase in CH4 contents in biogas up to about 90%.<br />Having revealed this phenomena, we have focused our studies on biogas emission intensification<br />as an agent for „green energy” production in the processes of agroindustrial waste waters and<br />liquid wastes purification with the contents in hydrocarbons, through the anaerobic digestion.<br />The further research have been concentrated on three directions: 1. Biochemical<br />formation of hydrogen, 2. Phyto-chemical intensification of biomethane formation and emission,<br />3. Winery waste water treatment through the beneficial ecologic-economical process of the<br />simultaneous formation of biogas with high contents in methane or hydrogen.</p></dc:description> <dc:source>The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova () 152-152</dc:source> <dc:title>Phyto-chemical intensification of biomethane and biohydrogen formation as “green energy” agents in the anaerobic digestion of agroindustrial waste waters</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>