Amalia, Felisa Rizky (2025) KAJIAN EFEKTIVITAS ABSORPSI CO₂ PADA PEMURNIAN BIOGAS DENGAN MENGGUNAKAN BITTERN DAN LARUTAN ALKALI. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
Biogas is a renewable energy source with great potential to replace fossil fuels; however, the presence of CO₂ and H₂S reduces its quality and combustion efficiency, making purification necessary. This study aimed to evaluate the effectiveness of CO₂ absorption using Bittern and alkaline solutions (3N KOH, 3N NaOH) with absorbent volumes ranging from 600 to 1000 ml. The absorption process was carried out in a bubble column, and the gas composition was analyzed using an Orsat apparatus and titration method. The results indicated that increasing absorbent volume reduced CO₂ concentration to 10–15% and H₂S to below 1.2%, while increasing CH₄ content to more than 80%, in accordance with SNI 8019:2014 biogas standards. Stepwise absorption (Bittern–KOH/NaOH) was more effective than single absorbents, yielding up to 87% CH₄ and reducing CO₂ to 10%. XRF analysis of the precipitate showed calcium (84.58%) and magnesium (14%) dominance, confirming carbonate and sulfate precipitation. These findings demonstrate that Bittern and alkaline solutions are effective absorbents for biogas purification, with stepwise absorption providing the most optimal improvement in biogas quality.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TP Chemical technology > TP155 Chemical engineering | ||||||||
| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | Felisa Rizky Amalia | ||||||||
| Date Deposited: | 04 Nov 2025 06:12 | ||||||||
| Last Modified: | 04 Nov 2025 06:12 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/45954 |
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