- Authors: Margaretha Arnita Wuri
- From: Master Program of Technology for Sustainable Development, Department of Environmental Science, The Graduate School of Universitas Gadjah Mada
Abstract:
Although biogas is claimed clean and environmental friendly, its existence is often unsustainable especially in rural area. Consumption energy still dominated by energy from fossil fuel because it?s cheaper, higher in energy efficiency and more ready to use than biogas. The efforts to make biogas can compete with fossil fuel energy had been done by increasing calorific value. The lower calorific value is due to the presence of carbon dioxide (CO2) in biogas. Reduction of CO2 by adsorption is able to enhance calorific value that evidenced by methane (CH4) enrichment. In this report, we investigated the effect of zeolite (Z-Z) and combination of zeolite-biochar from chicken manure without or with modification (Z-A1U dan Z-A1N) on CO2 and CH4 contents. These adsorbents were characterized by infrared spectrophotometer (FTIR) and surface area analyzer (SAA). FTIR spectra showed that functional groups of zeolite were represented by Si-O or Al-O bands at 1050, 796, 466 cm-1. Zeolite?s spesific surface area was 27,9 m2/g and pores width were dominated at 2,67 nm. The other hand, modified biochar showed the typical bands of nitorgenous group at 1039, 1047 and 1079 cm-1 that confirmed vibration of C-N streching. A board peak at 3393 and 1799 cm-1 corresponded to N-H and C=O band respectively. The result indicated that there was interaction between biochar and ammonia. Adsorption was carried out at room temperature with gas pressure ranging from 2 to 7 kg/cm2. Before and after adsorption, biogas were analyzed by gas chromatography (GC) to determine the effect adsorbent against CO2 and CH4 contents.
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