Merits of Anaerobic Digestion of Wastes

Anaerobic digestion is the natural biological process which stabilizes organic waste in the absence of air and transforms it into biofertilizer and biogas. It is a reliable technology for the treatment of wet, organic waste.  Organic waste from various sources is biochemically degraded in highly controlled, oxygen-free conditions circumstances resulting in the production of biogas which can be used to produce both electricity and heat. Almost any organic material can be processed with anaerobic digestion.

Anaerobic digestion is particularly suited to wet organic material and is commonly used for effluent and sewage treatment.  This includes biodegradable waste materials such as waste paper, grass clippings, leftover food, sewage and animal waste. The exception to this is woody wastes that are largely unaffected by digestion as most anaerobic microorganisms are unable to degrade lignin.

There are many advantages associated with anaerobic digestion process which may be classified into three groups viz. environment, energy and financial:

Environmental Benefits

  • Elimination of malodorous compounds.
  • Reduction of pathogens.
  • Deactivation of weed seeds.
  • Production of sanitized compost.
  • Decrease in GHGs emission.
  • Reduced dependence on inorganic fertilizers by capture and reuse of nutrients.
  • Promotion of carbon sequestration
  • Beneficial reuse of recycled waterProtection of groundwater and surface water resources.
  • Improved social acceptance

Energy Benefits

  • Anaerobic digestion is a net energy-producing process.
  • A biogas facility generates high-quality renewable fuel.
  • Surplus energy as electricity and heat is produced during anaerobic digestion of biomass.
  • Anaerobic digestion reduces reliance on energy imports.
  • Biogas facility contributes to decentralized, distributed power systems.
  • Biogas is a rich source of electricity, heat, and transportation fuel.

Financial Benefits

  • Anaerobic digestion transforms waste liabilities into new profit centers.
  • The time devoted to moving, handling and processing manure is minimized.
  • Anaerobic digestion adds value to negative value feedstock.
  • Revenues can be generated from processing of waste (tipping fees), sale of organic fertilizer, carbon credits and sale of power.
  • Anaerobic digestion plants increases self-sufficiency.

Many industries in the Middle East produce liquid and solid wastes that are suitable for anaerobic digestion, such as food processing, pharmaceuticals, organic chemicals, paper manufacturing and tannery industries. Some of the wastes might be difficult to digest as a sole substrate, but they can be biochemically degraded in combination with manure or sewage sludge. The combined digestion of different wastes is called co-digestion.

The relevance of biogas technology for the Middle East lies in the fact that it makes the best possible utilization of industrial organic waste as a renewable source of clean energy. Diversion of industrial waste from landfill sites and taking it to plants which can turn it into biogas and biofertilizer will ensure that it is treated in such a way that it becomes a useful product instead of a harmful one.  

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About Salman Zafar

Salman Zafar is the Founder of EcoMENA and a renowned expert in waste management, renewable energy, environment protection and sustainability. He is widely acknowledged as an authority on environment and sustainability sector in the Middle East and regularly consulted on environmental projects by top firms in the region and beyond. Salman is proactively engaged in creating mass awareness on clean energy, environment and sustainability through his websites, blogs, articles and projects. He has participated in numerous conferences as session chair, keynote speaker and panelist. Salman is a prolific professional cleantech writer and has authored numerous articles in reputed journals, magazines and newsletters. He holds Masters and Bachelors degree in Chemical Engineering and can be contacted on salman@ecomena.org or salman@bioenergyconsult.com
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One Response to Merits of Anaerobic Digestion of Wastes

  1. Mohamed Sarifdeen Rakeeb says:

    Dear Mr. Salman
    Assalamu Alaikkum

    Thanks for the article.

    There is a huge potential to produce bio gas from organic waste which is adequately available in the GCC countries. As natural gas is available for cheaper rate in the GCC Countries, there is a question that how far the bio gas produced by organic waste will be succeeded?

    Regards
    Mohamed Sarifdeeen Rakeeb

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