High performance fermentation process using methanol utilizing bacteria

Abstract

In a process running more than five months it was proved that a nonsterile processing is possible at a stable microbial composition as well as stable performance parameters like productivity, growth yield, and product quality. For the stable processing it is important that methanol and dissolved oxygen concentration must not simultaneously exceed the threshold values (methanol> 1 g/1; dissolved oxygen > 0,5 mg/1). The postulated transfer rate obstructs at higher biomass concentrations did not occur in the examined ranges up to 80 kg biomass/1. Consequently, the growth rate did not depend on high biomass concentrations in this range.

Calculation of optimal gas retention time using a logarithmic equation applied to a bio-trickling filter reactor for formaldehyde removal from synthetic contaminated air

“…Acidophilic and thermophilic bacteria have a low yield coefficient, generating little biomass and having the advantage of reducing the pressure drop of the biofilter. 4,18 Even though each type of research design [19][20][21][22] has its own standards for reliability and validity in treating VOCs, the determination of optimal gas retention time for FA removal in terms of the removal efficiency of a biotrickling filter is not fully understood.…”

Evaluation of gas retention time effects on the bio-trickling filter reactor performance for treating air contaminated with formaldehyde

“…On the basis of the previous reports describing risk-based models applied around the world, the use of a bio-trickling filter reactor (BTFR) is a cost-effective and environmentally friendly process for the separation of air pollutants from waste gases. [7][8][9][10][11][12] Biological treatment processes do not yield any emissions of undesirable by-products, as those produced by chemical scrubbing or thermal waste gas treatment processes do. 3 In the past, BTFRs were commonly used to remove odours by capturing the odour causing compounds in a media bed where they were oxidised by naturally occurring microorganisms.…”