Bioaugmentation Solution for Anaerobic Digesters
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Solution Overview
Problem
There is a need for a rapid spore incubation and activation method that allows for the generation of active Bacillus species at a point-of-use location for bioaugmentation in anaerobic digesters to increase methane production efficiently, as existing methods often require multiple steps and are prone to washout and competition from native microorganisms.
Innovation Solution
A nutrient-spore composition comprising a nutrient germinant composition and anaerobic or facultative anaerobic bacteria is heated to an elevated temperature, forming a bioaugmentation solution that can be added to the anaerobic digestion system in a single step, utilizing L-amino acids, sugars like D-glucose or D-fructose, and industrial preservatives to enhance spore germination and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-step spore activation methods are used, then spore germination can be achieved, but the process is time-consuming and prone to washout and competition from native microorganisms
Solution Approach 1:
The patent combines heat activation and nutrient germination into a single simultaneous step, eliminating the sequential multi-step process. The spores are exposed to both thermal energy and nutrient germinants at the same time, which accelerates the germination process while maintaining effectiveness, thereby reducing incubation time and minimizing washout risks.
Solution Approach 2:
The patent uses pre-concentrated nutrient germinant solutions that are prepared in advance with optimal compositions. These pre-formulated solutions contain specific amino acids, sugars, and other nutrients in precise concentrations that are known to effectively trigger spore germination, allowing the process to proceed rapidly without requiring extended incubation or multiple adjustment steps.
2Productivity
If concentrated nutrient-germinant solutions are used, then spore germination is enhanced, but contamination risk increases
Solution Approach 1:
The patent employs industrial preservatives in the concentrated nutrient-germinant solutions to prevent contamination. These preservatives, such as sodium benzoate, potassium sorbate, or parabens, are specifically selected to inhibit the growth of contaminating microorganisms while not interfering with the germination of the target spores. This converts the potential harm of contamination into a controlled environment that protects the germination process.
Solution Approach 2:
The nutrient-germinant solutions are formulated as composite compositions containing multiple components: specific amino acids (like L-alanine and L-valine), sugars (such as D-glucose or D-fructose), buffers (like phosphate buffers), and preservatives. This composite formulation provides synergistic effects where each component contributes to either germination promotion or contamination prevention, allowing high productivity with controlled safety.
3Adaptability or versatility
If point-of-use incubation is implemented, then active Bacillus species can be generated on-site, but the system complexity increases
Solution Approach 1:
The patent designs the system so that the point-of-use location performs its own spore activation using locally available resources. The concentrated nutrient-germinant solutions are stable at room temperature and can be stored without special equipment. When needed, they are simply mixed with water and heated in a standard water bath or incubator, eliminating the need for complex automated systems or specialized facilities at the point of use.
Solution Approach 2:
The patent uses concentrated nutrient-germinant solutions that can be easily diluted to working concentrations. This parameter change from concentrated to diluted form allows flexible adaptation to different application scales. The solutions are formulated to maintain stability across a range of temperatures and concentrations, enabling simple point-of-use preparation without requiring precise control equipment, thus reducing system complexity while maintaining versatility.
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
This method enables rapid germination of Bacillus species, resulting in increased methane production by 1 to 10% compared to non-bioaugmented systems, with a preferred increase of 5 to 7% in methane production when the bioaugmentation solution is used, enhancing the efficiency of anaerobic digestion processes.
Implementation Method 1
Nutrient germinants bind to receptors in the inner-membrane of the spore to initiate germination
Implementation Method 2
concentrated Bacillus spores can be combined with a concentrated nutrient-germinant solution at an elevated temperature (e.g. 41-44° C.) to induce germination
Implementation Method 3
Anaerobic digesters use bacteria to break up contaminants in the absence of oxygen. The anaerobic digestion of waste produces gas (methane or biomethane)
Implementation Method 4
sugars have been shown to increase the binding affinity of L-amino acids for their cognate receptors
Data Source
AI summary
A spore germination composition and method to produce a bioaugmentation solution that is added to an anaerobic digester or partially aerobic digester to increase biogas production. A nutrient-germinant composition comprises L-amino acids a phosphate buffer, an industrial preservative, and an optional source of potassium. The composition and spores of one or more Bacillus species are heated to a preferred elevated temperature range of 35° C. to 60° C. for an incubation period of around 20 to 60 minutes to form a bioaugmentation solution that is dispensed to the digester, preferably to the hydrolysis stage of the digester. A dose of bioaugmentation solution is added to the digester around once per day in an amount to provide at least 1000 CFU per mL of the full volume capacity of the digester, which can increase methane production by around 5 to 10% over operation of the digester without the bioaugmentation solution.