Operators Briefing Note – Anaerobic Digestion Operators Guidance Note – Effective Digestion of Food Waste

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2.0 What are the challenges? There are two groups of ‘biogas generating’ organisms available within an Anaerobic Digestion process: acetoclastic methanogens and hydrogenotrophic methanogens. Food waste has a high nitrogen content due to the high protein component. During anaerobic digestion this generates a high level of ammonia which is toxic to the acetoclastic methanogens. Whilst biogas production can still take place via the hydrogenotrophic methanogens, food waste digestion processes have been shown to be lacking in sufficient key trace elements to enable this process to continue efficiently. The interaction is complex, but the deficiency in certain trace elements results in an increase in Volatile Fatty Acids (VFA) which (over time) cause the inhibition of the hydrogenotrophic methanogens, and subsequent failure of the digestion process.

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تاریخ انتشار 2011