Using Enzymes in Biogas Production
Biogas is a renewable source of energy produced from organic materials such as agricultural waste, household waste, and livestock waste. Methane fermentation is the primary process in biogas production. During fermentation, organic materials are broken down into simple substances, which are then converted into biomethane. Various methods are used to enhance the biogas production process, one of which is the use of enzymes that break down different components of organic matter.
Enzymes used in biogas production include:
- Cellulolytic enzymes – break down cellulose, which is a primary component of plant material.
- Glycosidases – break glycosidic bonds, which are a primary type of bond in carbohydrates.
- Proteases – break down proteins.
- Lipases – break down fats.
Recommendations for enzyme applications (different enzyme preparations are used in various cases):
- Decomposing the outer layers of the substrate.
- Dealing with high viscosity and mixing issues.
- High cellulose content (e.g., silage, grass, straw).
- High starch content, corn grains.
- High sugar beet content (sugar beet pulp as a byproduct).
- High fat and protein content (organic waste).
Examples of enzyme use in biogas production
Agricultural waste: Enzymes can be used to break down agricultural waste, such as manure, ash, straw, and plant residues. This can help reduce the amount of waste going to landfills and produce biogas that can be used for electricity and heat generation. Household waste: Enzymes can be used to break down household waste, including food waste, paper, and plastic. This can help reduce landfill waste and produce biogas for electricity and heat production. Livestock waste: Enzymes can be used to break down livestock waste, such as manure and urine. This can help reduce waste sent to landfills and produce biogas for electricity and heat generation. Research on biomass processing with enzymes has shown an increase in methane yield from corn by 5-18%.
Results of enzyme use in biogas production
The advantages of implementing this technology include: reducing the breakdown and degradation of biomass outer layers, decreasing viscosity, and optimizing energy consumption for mixing processes, enhancing resistance to degradation, reducing organic matter loading, and improving residual gas potential.
