Articolul precedent |
Articolul urmator |
289 5 |
Ultima descărcare din IBN: 2022-12-12 01:05 |
Căutarea după subiecte similare conform CZU |
66.:628.31:628.35 (1) |
Tehnologie chimică. Industrii chimice și înrudite (1496) |
Tehnică sanitară. Apă. Igienă sanitară. Tehnica iluminatului (286) |
SM ISO690:2012 AVDEEVA, Lidiya, SARATOVSKIKH, Elena, YARULLIN, Rushit. Biological oxidation of high-energy compounds from industrial wastewater on example of nitrated cellulose. In: Ecological and environmental chemistry : - 2022, Ed. 7, 3-4 martie 2022, Chișinău. Chisinau: Centrul Editorial-Poligrafic al USM, 2022, Ediția 7, Vol.2, p. 22. ISBN 978-9975-159-08-1.. 10.19261/eec.2022.v2 |
EXPORT metadate: Google Scholar Crossref CERIF DataCite Dublin Core |
Ecological and environmental chemistry Ediția 7, Vol.2, 2022 |
|||||
Conferința "Ecological and environmental chemistry 2022" 7, Chișinău, Moldova, 3-4 martie 2022 | |||||
|
|||||
CZU: 66.:628.31:628.35 | |||||
Pag. 22-22 | |||||
|
|||||
Descarcă PDF | |||||
Rezumat | |||||
The ideal economic activity of humanity should be based on the principle of natural ecosystems that optimally consume matter and energy, the waste of some organisms serves as a habitat for others, i.e. waste-free recycling technologies. Accordingly, the purification of chemical production effluents is possible only with the use of biological oxidation methods. In the middle climatic zone a high-energy compounds as nitrated cellulose (NC) practically does not decompose. The resistance of NC to biodegradation leads to the accumulation of waste in settling ponds, which has a negative impact on the environment and on human health. The search for effective microorganisms-destructors and the development of a method of biological oxidation of effluents produced by NC are an acute scientific and economic task. The effluents of typical NC productions contain significant amounts of sulfates, therefore, sulfate-reducing bacteria are a promising model for studying the transformation of NC. They belong to the genera Desulfobacter, Desulfococcus, Desulfobacterium, Desulfosarcina, Archaeoglobus, and belong to chemoorganotrophic microorganisms. Some species of Desulfotomaculum are able to bring oxidation to CO2 and H2O. We performed studies on the oxidation of NC with a nitrogen content of 10.7 and 13.38 wt% using Desulfovibrio desulfuricans. Incubation of NC on bacteria was carried out for up to 65 days. The content of nitrate and nitrite groups in the solution was measured; changes in the molecular weight distribution, viscosity, heat release rate and heat of the thermal decomposition reaction and the elemental composition of the isolated and dried NC. Microorganisms intended for the oxidation of effluents produced by NC should be able to metabolize lignin and its derivatives. The microorganism must grow rapidly, competitively prevail in the environment and degrade low- and high-molecular derivatives of lignin. White rot mushrooms meet these requirements. The oxidation of NC was carried out using a mycelial fungus of the genus Fusarium solani IFO 31093. It was shown that in the presence of F. solani, the N content was 10.61% (16 days) and 10.51% (38 days). During 65 days of incubation, the pH decreased from 7.15 to 6.53. The decomposition of NC was indicated by the appearance of nitrate and nitrite groups in the culture medium – 11.4 mcg/ml and 3.38 mcg/ml. After 5 days of F. solani incubation, the proportion of low molecular weight products was 15%, by 65 days the molecular weights of these fragments had significantly decreased, which is promising from the point of view of practical application. Acknowledgments. This work was carried out in the framework of the state task (state registration no. AAAA-A19- 119071890015-6), theme 0089-2019-0014. |
|||||
|