Formation of fatty acid-degrading, anaerobic granules by defined species

Article Abstract:

Microbial species having aggregate-forming ability produce fatty acid-degrading granules. A propionate-degrading bacterium fails to form aggregates with Methanobacterium formicicum without the presence of an acetate-degrading Methanosaeta sp. in the culture. A medium with a mixture of acetate, propionate and butyrate and defined cultures of species such as Methanobacterium formicicum T1N and Methanosaeta sp. strain M17 produce fatty acid-degrading methanogenic granules. Methanobacterium formicicum and Methanosaeta sp. appear to play a role in granulation.

Analysis, Physiological aspects, Microbial aggregation, Fatty acid metabolism

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Performance of anaerobic granules for degradation of pentachlorophenol

Article Abstract:

The practicality of developing highly-dechlorinating anaerobic methanogenic granules and their performance in treating wastewaters with high pentachlorophenol (PCP) concntrations were evaluated. A mixture of acetate, propionate, butyrate and methanol were used as the carbon source for the development of the granules in a laboratory-scale anaerobic upflow sludge blanket reactor. Higher PCP sensitivity was demonstrated by syntrophic propionate degraders and acetate-utilizing methanogens compared to syntrophc butyrate degraders.

Methods, Usage, Biodegradation, Anaerobic bacteria, Pentachlorophenol

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Composition and role of extracellular polymers in methanogenic granules

Article Abstract:

The two methanogens, Methanobacterium formicicum and Methanosarcina mazeii contribute in the production of extracellular polymers of methanogenic granules. The extracellular polysaccharides produced by M. formicicum is composed of rhamnose, mannose, galactose, glucose and amino sugars. Ribose, galactose, glucose and glucosamine are the sugars present in M. mazeii. The polymer production by M. formicicum is influenced by growth temperature, substrates and nitrogen and phosphate concentrations.

Evaluation, Microbial polysaccharides

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