Biogas Production from Cow Manure and Pineapple Peels by Anaerobic Digestion Process

Abstract

This research study on biogas production from cow manure and pineapple peels by anaerobic
digestion process. The objectives of this research were to copare the ratio of cow manure : pineapple peels, to
compare the hydraulic retention time for the volume of biogas and to examine percentage of methane
generated by the fermentation. This research use 5 ratios; cow manure:pineapple peels:water were 1:0:1,
2:1:3, 1:1:2, 1:2:3 and 0:1:1.The biogas measured by the overflow siphon from the reaction tank (3
replications) and GC-MS was used for measuring the percentage of methane gas.
The results showed the highest volume of biogas from 1:0:1 ratio was 133.57 ± 0 cm3/day, 2:1:3 ratio,
1:1:2 retio, 1:2:3 retio, 0:1:1 retio was 125.71. ± 0 cm3/day, 117.86 ± 0 cm3/day, 110 ± 0 cm3/day, and 110 ± 0
cm3/day, respectively. The volume of biogas from 5 ratios were not significantly difference at 0.05 (p-value =
0.119). Then, the biogas from 1:0:1 was analyzed at 10 days, 20 day, 30 day, 40 day and 50 day retention
time. The biogas volume were 0 cm3/day, 68.1 ± 9.07 cm3/day, 130.95 ± 4.54 cm3/day, 36.07 ± 4.54 cm3/day
and 0 cm3/day, respectively, The volume of biogas from 5 retention time were significantly difference at p
<0.05. The highest volume showed at 30 days of the fermentation. The biogas fermentation in a 1:0:1 ratio had
methane gas 46.19% v / v.