We note from Fig. 3 that becomes flammable biogas from
9èmr days of digestion, neutral pH around 7, and the
degradation of organic matter is more readable because the
curve corresponding to the evolution of CDO begins to
decrease. Methanogenesis phase has not been inhibited by the
AGV (volatil fat acid), and NH4
+
. We notice a slight decrease
in the pH of the first day of the digestion until the fifth day of
digestion when the pH was lowered from 8.01 up to 6.76 as
shown in Fig. 4, when the pH increases this tells us that
acidogénège phase is exceeded and the degradation of organic
matter during methanogenesis and which is reflected in the
production of biogas. The temperature during digestion was
maintained around 35 ° C.