Abstract
The major difference between dairy cattle waste and swine, poultry or beef wastes is the considerably smaller fraction which is biodegradable. Thus, methane yields for dairy waste, when compared with beef, swine and poultry waste at identical operating conditions, are much lower, of the order of 50% of beef waste yields. The VS reduction is similarly about half that of beef and a third that of swine and poultry. This assumes the dairy herd is fed a roughage diet. Two temperatures were studied for dairy waste: 35°C and 60°C. As with beef, considerable literature reports exist for both these temperatures, but all full scale operations now use 35°C. The simulations lead to the following recommended designs for operation in the mesophilic and thermophilic ranges, respectively: temperatures—40°C and 60°C; influent VS concentrations—82·5 and 103 g litre −1 and detention times—8 and 6 days. Since dairy waste is only about half as biodegradable as beef waste, considerable differences exist in start-up and recovery techniques. The minimum detention times as determined by these simulations are 8, 6 and 4 days for 35°C, 40°C and 60°C operation, respectively.
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