Dog waste along with landscape waste and food waste contain complex organic molecules such as carbohydrates, proteins and lipids is first put in water through a process called Hydrolysis. This process makes complex organic molecules break down into simpler organic molecules. Then the next stage is Acidogenesis, where the simple organic molecules are converted into fatty acids by acidogenic (fermentative) bacteria. The third stage is Acetogenesis. In this process, simple molecules created through the acidogenesis phase are further digested by acetogens to produce largely acetic acid, as well as carbon dioxide and hydrogen. Finally, it gets to Methanogenesis, where molecules that have been converted into a suitable food source (or substrate) for methanogenic microorganisms. These organisms then in the end convert them into methane.
The optimum pH range for anaerobic digestion is neutral to slightly basic (pH 6.6 to 7.6). And the temperature should be maintained around optimally 35 ℃ for Mesophilic methanogens to be active. The higher the temperature the faster the process, but ultimately under 50 ℃.