Toxicity of N-substituted aromatics to acetoclastic methanogenic activity in granular sludge

Article Abstract:

Toxicity of environmental aminoaromatic compounds towards acetoclastic methanogenic bacteria in waste sludge is 500 times less than that of their nitroaromatic counterparts. Anaerobic microbes in methanogenic sludge remove the nitro group of the chemical pollutant nitroaromatics producing aminoaromatic compounds which are less toxic. On treatment with aerobic bacteria, the initial reduction of the nitro group in these compounds results in the mineralization of nitro compounds which are normally resistant to degradation by aerobic bacteria.

Health aspects, Pollutants, Structure-activity relationships (Biochemistry), Anaerobic bacteria, Aromatic compounds

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Successive mineralization and detoxification of benzo(a)pyrene by the white rot fungus Bjerkandera sp. strain BOS55 and indigenous microflora

Article Abstract:

Research was conducted to examine the degradation and mineralization of the five-ring polycyclic aromatic hydrocarbon (PAH) benzo(a)pyrene by the white rot fungus, Bjerkandera sp. strain BOS55. The mutagenicity of the metabolites was monitored during the oxidation and mineralization of benzo(a)pyrene. Results suggest that benzo(a)pyrene is quickly oxidized in a polar-water-soluble compounds by the white rote fungus Bjerkandera sp. strain BOS55.

Fungi, Oxidation-reduction reaction, Oxidation-reduction reactions, Polycyclic aromatic hydrocarbons, Benzopyrene, Biomineralization

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Anaerobic mineralization of toluene by enriched sediments with quinones and humus as terminal electron acceptors

Article Abstract:

Humic substances in soil can act as terminal electron acceptors in the bioremediation of toluene and other aromatic hydrocarbons by anaerobic bacteria. Nitrate and amorphous manganese dioxide can also be used as terminal electron acceptors.

Bioremediation, Soil microbiology, Humus

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