Combined Liquid and Solid Phase Anaerobic Digester

The Need: Transforming Waste into Energy with Enhanced Efficiency and Cost-Effectiveness

In the world of renewable energy and waste management, the demand for sustainable solutions that effectively convert organic materials into valuable energy sources is increasing. Conventional anaerobic digestion systems face significant challenges related to the handling and treatment of effluents, limiting their potential as both waste management tools and energy production methods. Additionally, solid state anaerobic digestion systems encounter issues with the high amount of inoculum required and the need for nitrogen supplementation. To meet the growing need for efficient waste-to-energy processes, a groundbreaking technology has been developed, combining the strengths of liquid anaerobic digestion with solid state anaerobic digestion to create a novel and cost-effective approach to waste conversion and energy production.

The Technology: A Synergistic Combination of Liquid and Solid State Anaerobic Digestion

The technology at hand presents a cutting-edge process and system for generating biogas from solid organic materials, with a particular focus on lignocellulosic biomass. By harnessing the power of both liquid and solid state anaerobic digestion systems, this innovative approach revolutionizes waste-to-energy processes. The liquid anaerobic digestion system provides digestion effluent, rich in nitrogen, which serves as both a nutrient source and inoculum for the solid state anaerobic digester. This ingenious combination overcomes the challenges faced by traditional systems and paves the way for improved efficiency and cost-effectiveness in methane production.

Commercial Applications:

  • Waste-to-Energy Facilities: The technology can be utilized in waste-to-energy facilities for converting various organic waste materials, such as food waste, agricultural waste, and lignocellulosic biomass, into biogas, thus contributing to sustainable energy production.

  • Municipal Solid Waste Processing: Solid state anaerobic digestion is ideal for processing the organic fraction of municipal solid waste, enabling efficient waste management and energy generation.

  • Agricultural Residue Conversion: Agricultural residues, like animal manure and crop waste, can be effectively processed using this technology, offering an environmentally friendly method of waste disposal while harnessing valuable energy.


  • Enhanced Efficiency: The combination of liquid and solid state anaerobic digestion maximizes methane production while reducing energy consumption, resulting in improved overall efficiency.

  • Cost-Effectiveness: By utilizing liquid anaerobic digestion effluent as inoculum and nutrient source, the technology eliminates the need for costly nitrogen supplementation and other additives, lowering production costs.

  • Reduced Environmental Impact: The efficient conversion of organic waste into biogas reduces greenhouse gas emissions, mitigating environmental impacts and contributing to a cleaner, greener future.

  • Versatile Feedstock: The technology accommodates a wide range of feedstocks, including sewage sludge, food waste, lignocellulosic biomass, and more, providing flexibility in waste management applications.

  • Combined Heat and Power (CHP) Generation: The methane produced from the system can be used in a CHP unit, generating electricity while utilizing the heat for promoting digestion processes, further optimizing energy use.

In summary, this pioneering technology represents a significant step forward in waste-to-energy solutions. By seamlessly integrating liquid and solid state anaerobic digestion systems, it not only addresses the limitations of conventional approaches but also unlocks new possibilities for efficient, cost-effective, and environmentally sustainable waste management and energy production.


Patent # Title Country
8771980 Combined Liquid to Solid-Phase Anaerobic Digestion for Biogas Production from Municipal and Agricultural Wastes United States of America

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