2.2.6 pH (pH).In general, plaque build methane will do well in the pH of about 6.7-7.4 by appropriate value in 7.0-7.2 and the system will fail when pH down until 6.0 due within the fermenter bacteria in the production of volatile fatty acid If the system is in equilibrium. At lower down, this will be restored by bicarbonate manufactured by microorganisms generate methane. On the other hand, if the balance of the system lost. The state of the buffer will disappear. Procedure to generate methane will halt (Jenkins et al, 1983; Borja et al, 1995b; Hu et al, 2002).
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