Abstract
The effects of volatile fatty acids, ammonia and copper on methane production by growing cultures of Methanobacterium formicicum were studied. Acetate and butyrate were not inhibitory, but propionate was inhibitory above certain concentrations, as was ammonia. Copper was inhibitory, but inhibitory concentrations are difficult to define as varying amounts may be precipitated as the sulphide. The results are compared with those from piggery-waste digesters and it is suggested that failure of farm-waste digesters from such inhibitions is unlikely.
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