Clostridium Microbial Consortium for 1,3-Propanediol Production
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Solution Overview
Problem
Current methods for producing 1,3-propanediol from glycerol are inefficient, generating waste and requiring expensive cofactors, and are not suitable for continuous production with high glycerol concentrations from industrial sources, especially from biodiesel production.
Innovation Solution
A microbial consortium comprising at least 85% Clostridium acetobutylicum, less than 0.2% Clostridium sporogenes, and less than 15% Clostridium sphenoides is used for continuous fermentation in a culture medium with high glycerol content, optimizing 1,3-propanediol production and reducing residual glycerol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pure cultures of PDO-producing organisms (Klebsiella pneumoniae, C. butyricum, or C. pasteurianum) are used for fermentation, then PDO can be produced from glycerol, but the maximal productivity is limited to 0.8-1.1 g.L-1 and the process is discontinuous due to strain instability
Solution Approach 1:
The patent combines multiple microorganism strains (C. acetobutylicum, C. sporogenes, and C. sphenoides) into a microbial consortium to overcome the limitations of single-strain systems. This merging of different organisms with complementary metabolic capabilities enables both high productivity and process stability in continuous fermentation operations.
2Productivity
If vitamin B12-independent glycerine-dehydratase and PDO-dehydrogenase from C. butyricum are introduced into C. acetobutylicum, then PDO production capability is improved, but the behavior remains globally similar to the original strain with limited productivity enhancement
Solution Approach 1:
The patent creates a composite microbial system by combining multiple strains with different metabolic characteristics. The consortium integrates the vitamin B12-independent pathway from C. butyricum with the capabilities of C. acetobutylicum and other strains, achieving both high productivity and adaptive versatility that single engineered strains cannot provide.
3Productivity
If adapted strains of C. acetobutylicum are used to grow in medium with high glycerol concentration (up to 120 g.L-1), then PDO production is achieved, but residual glycerol remains high and productivity is limited
Solution Approach 1:
The microbial consortium performs multiple functions simultaneously: C. acetobutylicum and its adapted strains produce PDO from glycerol while other consortium members consume residual glycerol and by-products. This multi-functional system achieves both high PDO production and complete glycerol utilization, eliminating the trade-off between productivity and substrate exhaustion.
4Ease of manufacture
If chemical routes are used to produce PDO, then production cost can be controlled, but waste streams containing extremely polluting substances are generated
Solution Approach 1:
The patent converts the previously harmful waste stream (glycerol from biodiesel production) into a valuable resource for PDO production. The microbial consortium efficiently transforms this abundant, low-cost substrate into high-value PDO while generating environmentally friendly by-products, thereby eliminating pollution and reducing production costs simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The consortium achieves higher titers and yields of 1,3-propanediol with reduced residual glycerol, improving the efficiency and sustainability of the production process, particularly with glycerol concentrations up to 105 g/L from industrial sources.
Implementation Method 1
PDO can be produced by different chemical routes but they generate waste streams containing extremely polluting substances... PDO is a typical product of glycerine fermentation... C. butyricum was previously described as being able to grow and produce PDO from glycerol contained in industrial glycerine in batch and two-stage continuous fermentation
Data Source
AI summary
The present invention relates to a microbial consortium, especially adapted for growth and production of 1,3-propanediol from a culture medium with high glycerinecontent and specifically with a high concentration of industrial glycerine. More particularly, this microbial consortium comprises at least one strain C. acetobutylicum and at least one strain chosen among strains of C. sporogenes and/or strains of C. sphenoides. The invention also relates to a method for the production of 1,3-propanediol by culturing this microbial consortium resulting in a co-culture of these particular different microorganisms.