Dry Anaerobic Digestion Systems

Microbial Dry Anaerobic Digestion (AD) is a biological process with microorganisms, like bacteria, breaking down biodegradable organic materials in an environment with no oxygen (O2) present. The high total solids (TS) content is within the range of 15%-40%. Unlike 'wet' AD systems that operate with lower solids concentrations, Dry AD is tailored to feedstocks with limited, free water. Through complex metabolism, archaea, mesophilic and thermophilic bacteria convert complex organic compounds (i.e., carbohydrates, proteins, fats) into simpler molecules, then biogas (a mix of methane, CH4, and carbon dioxide CO2) is produced alongside a solid residue known as digestate.

• Batch Systems: These systems are found in garage and tunnel reactors. Feedstock is added in batches and is digested over a set time after which it is removed. Best suited for heterogeneous waste streams.
• Continuous Systems: Utilize vertical plug-flow or horizontal agitated reactors that have nozzles for continuous feeding of the feedstock and the removal of digestate, leading to constant biogas production.
• We customize the type of system to our clients based on the characteristics and volume of feedstock in combination with operational preferences.

• Waste Diversion: Reduction in the volume of biodegradable waste that goes to landfill sites.
• Greenhouse Gas Reduction: Captures methane (CH4), a potent greenhouse gas that would otherwise be emitted during landfill decomposition, and uses it to produce energy.
• Renewable Energy Production: Biogas formed can produce heatand electricity through Combined Heat and Power (CHP) units, and be upgraded to biomethane for vehicle fuel or injection into the grid.

• Feasibility Studies & Waste Audits: Assessment of feedstock availability and composition, site selection, and economic analysis for dry AD waste streams.
• Custom System Design & Engineering: Adapting the Dry AD technology (batch/continuous and reactor type) to specific client needs and waste streams.
• Equipment Procurement & Supply: Acquisition of reputable and dependable parts for the digestion plant.
• Biogas Utilization Strategy: Advising on the most technically and economically viable options for generating biogas (e.g., CHP, upgrading, grid injection).
• Digestate Management Solutions: Supporting clients in the analysis and compliance for digestate quality and identifying commercially beneficial reuse pathways like in the fertilizer or soil amendment markets.