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Anaerobic Digestion Explained

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Anaerobic digestion (AD) is a sustainable process used to convert organic materials into renewable energy and nutrient-rich digestate. By harnessing the power of microorganisms in an oxygen-free environment, AD plays a vital role in reducing waste, generating biogas, and supporting a circular economy.

 

How Does Anaerobic Digestion Work In Practice?

 

Anaero CSTR (Laboratory Scale)

 

    1.    Start by setting up a small-scale anaero auto-fed system with feedstock (organic matter) for testing.

    2.    Biomass from the syringe is fed into the reactors feeding syringe to enable automatic feeding.

    3.    Biomass is systematically fed into the reactor and AD takes place, converting the biomass into gas and digestate. 

    4.    Excess biomass is collected in designated digestate bottles for further analysis.

 

Full-Scale AD Plant

 

    1.    Organic feedstock is delivered by trucks to the inlet tank for pre-treatment and storage.

    2.    The feedstock is pumped into the feeding system for regular input into the digester.

    3.    Every 1–2 hours, the digester is fed with the prepared material to maintain optimal performance.

    4.    Excess biomass flows into a digestate tank for storage, where it can be used as a bio-fertiliser.

Benefits of Anaerobic Digestion

    •    Environmental Benefits: Reduces greenhouse gas emissions by diverting organic waste from landfills.

    •    Energy Production: Generates biogas, which can be used for electricity, heat, or upgraded into biomethane.

    •    Resource Recovery: Produces nutrient-rich digestate, an excellent alternative to chemical fertilisers.

    •    Soil Replenishment:  Microbial activity and nutrients in digestate enhances soil fertility and structure.

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