Pengaruh Penambahan EM4 Pada Pembuatan Biogas dengan Bahan Baku Kotoran Sapi Menggunakan Digester Fix Dome Sistem Batch

Abstract

Biogas is a gas produced from the fermentation process of organic materials by
microorganisms in closed conditions (anaerobic). Biogas consists of ± 60% CH4 (methane), ±
38% CO2 (carbon dioxide), ± 2% N2 (nitrogen), O2 (Oxygen), H2 (hydrogen), and H2S
(hydrogen sulfide). In this research, the making of biogas uses raw materials from cow dung.
Cow dung is the right raw material because it contains methane-producing bacteria. This
research aims to determine the influence of the EM4 addition of biogas quality produced. This
research was conducted in the Basic laboratory system of energy generation of the Surabaya
State Polytechnic electronics. The method of the research is to use a comparison of cow and
water in raw materials, with a ratio of 1:1 with the addition of EM4 (Effective microorganism)
as much as 3 liters on variations of 1 and 1.5 liters on variation 2. Biogas making is carried out
on the digester with a volume of 200 liters with a batch system with stirring 3 times a day with
fermentation for 25 days. The result of this research is with the addition of EM4 as much as 3
liters produce biogas with methane gas content with the amount of 53.6%. The resulting biogas
combustion test has a yellowish blue flame, a long flame of 56 seconds. While the addition of
EM4 with a total of 1.5 liters produces biogas with methane gas content with the amount of
46.8% yellow flame color with a long flame of fire for 34 seconds