Abstract
The natural methane formed by bacteria in anaerobic conditions is known as biogenic gas. Gas trapped in coal, formed through thermogenesis as well as biogenesisis known as coal-bed methane (CBM). The availability of organic material as decomposition of this material into methane is continuously required for the production of methane in the coal aquifer. The aim of this research was to investigate whether or not cattle feces bacteria were able to grow and produce methane in coal. Parameters measured were Volatile Fatty Acids (VFA) and the production of biogas, such as nitrogen, hydrogen, carbon dioxide, and methane. Explorative method was used and data obtained was analyzed by descriptive approach. The results showed that the bacteria found in the feces survived in the coal and produce biogas. On day 2 when the process was at the acidogenesis phase, it produced VFA with the largest component of acetic acid. Acetic acid would undergo decarboxylation and reduction of CO2 followed by reactions of H2and CO2 to produce methane (CH4) and carbon dioxide (CO2) as the final products. ,
Highlights
Biogas in general consists of methane (CH4), carbon dioxide (CO2), hydrogen (H2) and small amounts of other gases
It is an alternative source of organic material that can be utilized to maintain the continuity of coalbed methane production
Cattle feceswere utilized as bacteria sources, while coal was utilized as microbial culture media
Summary
Biogas in general consists of methane (CH4), carbon dioxide (CO2), hydrogen (H2) and small amounts of other gases. Methane (CH4) is a gas that can be used as an alternative and environmental friendly energy source. Non-conventional energy sources, such as coal-bed methane have been widely utilized. In Indonesia, several types of coal, namely Anthracite, Bituminous, Subbitumminous, and Lignite have been utilized as sources of energy (Tim Kajian Batubara Nasional, 2006). In order to sustain its utilization, this material need to be further processed by using methane-forming microbes (methanogens) derived from cattle feces ina digester scale. Cattle feces still contain microorganisms which can be reduced over anaerobic degradationor biogas process to prevent environmental pollution. It is an alternative source of organic material that can be utilized to maintain the continuity of coalbed methane production.
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