Multi-simultaneous Absorption and Adsorption Processes for Biogas Purification using Ca(OH)2 Solution and Activated Clinoptilolite Zeolite/Chitosan Composites
This study examined the effects of acid/base activation and chitosan coating on clinoptilolite zeolite as an adsorbent for biogas purification from palm oil mill effluent (POME) using simultaneous absorption–adsorption methods. The effects of chitosan concentration in the clinoptilolite zeolite/...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2019-11-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | http://ijtech.eng.ui.ac.id/article/view/3695 |
| Summary: | This study examined
the effects of acid/base activation and chitosan coating on clinoptilolite zeolite
as an adsorbent for biogas purification from palm oil mill effluent (POME)
using simultaneous absorption–adsorption methods. The effects of chitosan
concentration in the clinoptilolite zeolite/chitosan (ZAC) composites were
studied to determine the best type of adsorbent for purifying biogas to obtain
the highest methane (CH4) concentration: the biogas produced from
POME via an anaerobic digestion process had a CH4 concentration of
87% and a carbon dioxide (CO2) concentration of 13%. In this study, the
Ca(OH)2 solution was used for the absorption process, and the ZAC
composite was used as the adsorbent in the adsorption process. To enhance the
adsorption efficiency of the adsorbent when purifying biogas, clinoptilolite
zeolite (ZA) was activated using strong acid (HCl) and base (NaOH) in various
concentrations (ranging from 1–3 M), calcination at 450°C for 2 h, and coating
with chitosan concentrations (ranging from 0.25–1 v/v%). The ZA was coated with
chitosan to increase its adsorption efficiency, as chitosan contains high
levels of amine and hydroxyl groups that interact with CO2
impurities and form carbamic acid, ultimately producing carbamate salt. The
composition of biogas before and after treatment was analyzed using gas
chromatography. Overall, the final content of
the biogas after the purification process with absorption using the Ca(OH)2
solution and adsorption in a fixed-bed column using the ZAC2-0.5 composite was
0.42% CO2 and 99.58% CH4. The purified biogas
had a very high methane gas content; thus, this study’s findings suggest that
purified biogas can be used as a clean energy source for wider industrial
applications. |
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| ISSN: | 2086-9614 2087-2100 |