At GreenEdge, we are working on the bio-energy landscape by focusing on renewable natural gas (RNG).

Get In Touch

Email info@greenedgerenewable.com
Phone +91 90193 72470
Location Bangalore - Karnataka

GreenEdge

Technology

Green Edge Renewable > Technology

The technology for producing Compressed Bio Gas (CBG), also known as Bio-CNG, involves a series of processes to convert organic waste into clean and renewable energy. Here’s a detailed overview:

1. Feedstock Collection and Preparation
  • Feedstock: Organic waste such as agricultural residue, poultry waste, municipal solid waste, food waste, or energy crops (e.g., Napier grass).
  • Pre-treatment: The feedstock is shredded and homogenized to improve the efficiency of the digestion process.
2. Anaerobic Digestion
  • The prepared feedstock is fed into a biogas digester, where microorganisms break down the organic material in the absence of oxygen.
  • This process generates biogas, which is a mixture of methane (CH₄), carbon dioxide (CO₂), and trace gases.
3. Biogas Purification
  • Raw biogas is purified to remove impurities like carbon dioxide (CO₂), hydrogen sulfide (H₂S), and moisture.
  • Common purification technologies:
    ○ Water scrubbing: Uses water to absorb CO₂ and H₂S.
    ○ Pressure Swing Adsorption (PSA): Separates gases using adsorption under pressure.
    ○ Membrane separation: Uses selective membranes to separate methane from CO₂ and other impurities.
    ○ Chemical scrubbing: Uses chemical solvents to remove CO₂ and H₂S.
4. Compression
  • The purified biogas, which is now predominantly methane, is compressed to 200-250 bar to produce Compressed Bio Gas (CBG), suitable for storage and transportation.
5. Storage and Distribution
  • CBG is stored in high-pressure cylinders or storage tanks.
  • It can be distributed via pipelines or transported to end-users for use as a fuel in vehicles, industrial applications, or cooking.
6. Byproduct Management
  • Digestate: The residue from the digester is rich in nutrients and can be processed into organic manure or bio-fertilizer.
Advanced Technologies for Efficiency
  • Pre-treatment innovations: Techniques like thermal hydrolysis, ultrasonic treatment, or enzymatic digestion to enhance biogas yield.
  • Real-time monitoring: Sensors and IoT systems for monitoring digester performance and gas quality.
  • Hybrid plants: Integrating bio-CNG with other renewable energy technologies like solar or biomass power plants for efficient energy use.
Applications
  • Replacement for conventional fossil-based CNG in vehicles.
  • Industrial energy use as a cleaner alternative to LPG or natural gas.
  • Feedstock for producing green hydrogen.