Although AD offers these benefits, its application to certain types of organic waste has been difficult to implement because of technical limitations and issues of process stability. It is possible that some of these limitations might be overcome by a better understanding of the microbiology and biochemistry of the methanogenic microbial consortium and adaptation of the engineering design of the process. Factors that need to be considered include: balancing the nutrient requirements, understanding critical process control parameters, overcoming issues of inherent toxicity, engineering to improve biogas productivity and minimise fugitive emissions, and producing a residue (effluent or digestate) of suitable quality for release to the environment (Speece, 1983).
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