| Summary: | The experimental study was undertaken in order to evaluate the effects of the initial pH on the anaerobic digestion of dairy waste. The biodegradability tests were carried out in a series of reactor of 400ml of volume with four arrangements of the initial pH (pH= 4; 5.5; 7; and 9.5) in thermophilic phase (T = 55 °C). The dairy wastewater was the only source of organic carbon.
After the incubation period (50 days), the result show that the height efficiency of removal COD (about de90.8 %) was obtained for initial pH = 7, allowed by Reactor of pH=9.5 79.64 %; pH=5.5 63.75 % and finally pH=4 (49.11%). Concerning the produced biogas it volume was: 163ml, 1000ml, 2000ml and 1500ml for pH= 4; 5.5; 7 and 9.5 respectively.
However the produced of CH4 for pH=4 is negligible, for the pH=5.5 and pH=9.5 is slightly over 50 % and 75 % respectively compared to the production of the test pH=7It can be concluded that dairy waste degradation in anaerobic process can happen optimum on range neutral pH.
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