Effect of pH on biogas production during anaerobic digestion


Hussain A. ali, Johain J. Faraj, Fawziea M. Hussien
Middle Technical University Engineering Technical College-Baghdad, Baghdad Iraq.


The disposal of organic waste is one of the most important problems facing society at the present time, as letting it ferment in the open produces unpleasant odors and causes many diseases. It also contributes significantly to increasing the phenomenon of global warming as it helps to produce toxic gases that affect the environment and cause global warming Including methane gas resulting from the process of decomposition of waste. Therefore, the process of anaerobic decomposition is the best solution for disposing of waste in a safe way and at the same time biogas is produced that can be used for the purpose of cooking and heating, as this process produces good quality fertilizer that is used for the purpose of fertilizing the soil. This research is subjected to studying the effect of different pH on biogas production and studying the concentrations of methane and carbon dioxide during the fermentation period, which reached 55days. The results are presented in clear curves to facilitate the study. The substrate used is corn with the addition of suitable primers to speed up the fermentation process. The results showed that the highest production of biogas and methane gas was at the digester whose pH was 7, followed by the digester that had pH 6.5, 5.5 and 4.5, respectively.