Recalcitrant Organic Compounds
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Ferro zero: uma nova abordagem para o tratamento de águas contaminadas com compostos orgânicos poluentes
Anthropogenic pollution of groundwater and surface water has become a very serious environmental problem around the world. A wide range of toxic pollutants is recalcitrant to the conventional treatment methods, thus there is much interest in the development of more efficient remediation processes. Degradation of organic pollutants by zero-valent iron is one
Química Nova. Publicado em: 2005-02
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14. RemediaÃÃo de solos contaminados por derivados de petrÃleo utilizando processo foto-fenton
In the manipulation of petroleum derivatives may occur the contamination of soil, because of leaks, spills and other accidents during the exploration, refining, transport and storage. Those accidents have been increasing in the last years due to the growing demand of energy of the country. Many of these pollutants are highly impactants for man and environmen
Publicado em: 2005
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15. Redução de poluentes de efluentes das indústrias de papel e celulose pela floculação/coagulação e degradação fotoquímica
The abatement of recalcitrant lignin macromolecules from effluents of pulp and paper industry was investigated by combined process. Flocculation and coagulation with aluminum sulfate and natural polyelectrolytes extracted from cactus Cereus peruvianus were used in the first step. After separation of solid residues by filtration, the photochemical methods usi
Química Nova. Publicado em: 2002-09
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16. Fungos degradadores de compostos organicos recalcitrantes sob condições microaerobia e anaerobia
The industrial activities of modern society produce great amounts of toxic compounds, which persist in rivers, soils and oceans, causing disturbance to ecosystems. Owing to an extracellular and non-specificenzymatic system produced by whiterot fungi, degradation of these xenobióticos became a viable alternative for environmental bioremediation. Such lignino
Publicado em: 2002
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17. Tratamento biológico de efluentes de indústrias de papel após floculação e coagulação com sais de alumínio e polieletrólitos naturais
The flocculation and sedimentation of recalcitrant organic compounds of high molecular weight using natural polyelectrolytes, extracted from the cactus Cereus peruvianus and Opuntia ficus indica, have been studied. Organic compounds of high molecular weight from effluents of paper and pulp industries are difficult for biological degradation. However, using a
Brazilian Archives of Biology and Technology. Publicado em: 2000
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18. Colloidal and Dissolved Organic Matter Excreted by a Mixotrophic Flagellate during Bacterivory and Autotrophy
Excretion of dissolved and colloidal organic carbon by a mixotrophic flagellate, the chrysophyte Poterioochromonas malhamensis, was studied. Flagellates were incubated either with 14C-labeled bacteria or with inorganic 14C, in order to compare organic exudates originating from primary production with exudates originating from ingested bacteria. Colloids of >
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19. Biodegradation of halogenated organic compounds.
In this review we discuss the degradation of chlorinated hydrocarbons by microorganisms, emphasizing the physiological, biochemical, and genetic basis of the biodegradation of aliphatic, aromatic, and polycyclic compounds. Many environmentally important xenobiotics are halogenated, especially chlorinated. These compounds are manufactured and used as pesticid
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20. Heterotrophic activity and biodegradation of labile and refractory compounds by groundwater and stream microbial populations.
The bacteriology and heterotrophic activity of a stream and of nearby groundwater in Marmot Basin, Alberta, Canada, were studied. Acridine orange direct counts indicated that bacterial populations in the groundwater were greater than in the stream. Bacteria that were isolated from the groundwater were similar to species associated with soils. Utilization of
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21. Dechlorination of chloroacetanilide herbicides by thiosulfate salts
Halogenated organic compounds (XOCs) are among the most widely used synthetic chemicals. Many XOCs are recalcitrant to natural degradation and have become prominent environmental contaminants. One group of such XOCs are the heavily used chloroacetanilide herbicides. We have found that chloroacetanilide herbicides are rapidly dechlorinated in water, sand, and
National Academy of Sciences.
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22. Biological Degradation of 2,4,6-Trinitrotoluene
Nitroaromatic compounds are xenobiotics that have found multiple applications in the synthesis of foams, pharmaceuticals, pesticides, and explosives. These compounds are toxic and recalcitrant and are degraded relatively slowly in the environment by microorganisms. 2,4,6-Trinitrotoluene (TNT) is the most widely used nitroaromatic compound. Certain strains of
American Society for Microbiology.
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23. Utilization of Trihalogenated Propanes by Agrobacterium radiobacter AD1 through Heterologous Expression of the Haloalkane Dehalogenase from Rhodococcus sp. Strain m15-3
Trihalogenated propanes are toxic and recalcitrant organic compounds. Attempts to obtain pure bacterial cultures able to use these compounds as sole carbon and energy sources were unsuccessful. Both the haloalkane dehalogenase from Xanthobacter autotrophicus GJ10 (DhlA) and that from Rhodococcus sp. strain m15-3 (DhaA) were found to dehalogenate trihalopropa
American Society for Microbiology.