Abstract
Earlier work by the authors has shown that batch anaerobic digestion of waste milk and cattle slurry is feasible at COD loadings of up to 29.3 kg COD m−3. Higher COD loadings were added to batch anaerobic digestion systems in an attempt to determine the maximum COD loading which could be applied without causing digester failure. Biogas methane concentration was found to give a good indication of the effect of the shock loading on the digestion system. COD removal was significantly reduced in digesters receiving the highest shock loading. Reduced NH4 +-N and NH3 concentrations in this system suggested depressed biological activity.
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