Biogas Production from Waste Potato Skin and Cow Dung by Anaerobic Co-digestion: Study of C/N Ratio, EM-4 Bacteria and pH

IJEP 42(14): 1714-1719 : Vol. 42 Issue. 14 (Conference 2022)

Hashfi Hawali Abdul Matin1*, Bonifasius Yulidesra Damarjati2, Muhammad Idham Gaffar Shidqi2 and Budiyono Budiyono2

1. Sebelas Maret University, Environmental Science Department, Faculty of Mathematics and Natural Science, Surakarta 57126, Indonesia
2. Diponegoro University, Chemical Engineering Department, Faculty of Engineering, Semarang 50275, Indonesia


Bioenergy is seen as a solution to the problem of energy security. One of the renewable energy sources comes from biological natural resources, which are developed during biogas production. The composition of biogas is in the form of methane gas (CH4), carbon dioxide (CO2) and a small amount of gas in the form of H2, N2 and H2S. This study aims to examine the effect of C/N ratio, EM-4 ratio and pH on biogas yield. In this biogas production research, the variables used were the C/N ratio of 25 and 30, the addition of 10% EM-4 bacteria and pH variations of 6.8 and 7. This research includes three stages: the preparation stage, operation stage and results analysis stage, which was conducted on a laboratory scale with a batch system. This article also discusses the kinetics of biogas production using the Gompertz equation. The experiments show that biogas with C/N ratio of 30 produces more biogas upto 17.6-26.1% than the C/N ratio of 25. The addition of EM-4 bacteria will result in more biogas production upto 17.8-23.4%. A pH value of 7 resulted in more biogas production, 26-29%, than a pH of 6.8. The variable C/N ratio of 30, with the addition of 10% EM-4 and pH 7, resulted in the values of A (maximum biogas production), U (maximum biogas production rate) and l (time of the lag phase), which were the largest.


Biogas production, Waste potato skin, Cow dung, Anaerobic co-digestion


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