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Appl Environ Microbiol. 1987 July; 53(7): 1589-1592
Copyright © 1987, American Society for Microbiology. All Rights Reserved.

Effects of pH, Temperature, and Nutrients on Propionate Degradation by a Methanogenic Enrichment Culture

Environmental and Occupational Health Sciences, School of Public Health, University of California, Los Angeles, California 90024

ABSTRACT

Enrichment cultures were used to determine the conditions promoting fastest methanogenic propionate degradation and growth by adapting the cultures to various physical and chemical conditions and measuring the specific growth rate. We found that the fastest growth of propionate oxidizers occurred at pH 6.8 to 8.5 and 32 to 45°C. Acetate-degrading populations showed narrower optima for fastest growth (pH 6.8 to 7.2 and 37 to 43°C). Enrichment cultures grew as well in minimal medium as in complex medium, although individual microbial populations appeared to require growth factors which could be met by cross-feeding.

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