Durable continuous fermentation of a model mixture of d(+)-glucose and l(−)-sodium monoglutamate under non-axenic conditions

The possible durability of non-axenic fermentation profiles is of major importance in controlled environmental biotechnology. The durability of the non-axenic anaerobic fermentation profile of a model mixture of d(+)-glucose and l(–)-sodium monoglutamate was documented in a fabricated bioreactor for a period of more than 6 months. A cyclic scheme of reactor loading induced a cyclic, reproducible and durable fermentation profile. Equimolar amounts of n-butyric acid as well as acetic acid, and of H₂ and CO₂ were observed as steady metabolites.Correspondence to: E.-J. Nyns     

Toxicity of a mixture of polychlorinated organic compounds towards an unacclimated methanogenic consortium

Summary The toxicity of a mixture of polychlorinated aliphatic compounds towards an unacclimated methanogenic consortium was assayed in carrier-free, continuously-stirred batch experiments. Results obtained indicate that a 50 % inhibition of methanogenesis occurs at 3.3 mg toxic mixture per litre mixed liquor and that at 100 mg toxic mixture per litre mixed liquor, the inhibition of methanogenesis is complete.     

Fermentation profiles in bioconversions

Biotechnology Letters - Any complex substrate biomass can be characterised by its “fermentation profile”, i.e. a complex substrate biomass, in the presence of an ubiquitous microbial...