Hafiza, Putri Nur (2026) 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 that contains methane (CH₄) as the main energy component, along with impurities such as carbon dioxide (CO₂), hydrogen sulfide (H₂S), and oxygen (O₂), which reduce its calorific value and combustion efficiency. This study aims to evaluate the effectiveness of Bittern, a by-product of salt production, and alkaline solutions (KOH and NaOH) as absorbents in the purification of biogas, as well as to examine the influence of absorbent volume on the absorption of CO₂. The research was conducted using a bubble column absorption system with absorbent volumes ranging from 600–1000 mL. Gas composition before and after absorption was analyzed using an Orsat apparatus and XRF analysis was performed on the precipitate. The results show that the combination of Bittern and 3N KOH with an absorbent volume of 1000 mL was the most effective treatment, reducing CO₂ concentration in biogas from 38.8% to around 10% and increasing CH₄ concentration up to 87%. The increase in absorbent volume correlated with a more significant decrease in CO₂ and a corresponding increase in CH₄. In addition, impurities such as H₂S and O₂ also decreased after the absorption process. XRF analysis of the precipitate revealed that it was predominantly composed of calcium (84.58%) and magnesium (14%), indicating the formation of carbonate and sulfide compounds during absorption. This study demonstrates that Bittern, when combined with alkaline solutions, can serve as an effective and low-cost absorbent for biogas purification. The utilization of Bittern not only improves biogas quality but also provides added value to salt production waste, offering an environmentally friendly and sustainable alternative for renewable energy development.
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > T Technology (General) T Technology > TP Chemical technology T Technology > TP Chemical technology > TP155 Chemical engineering |
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| Divisions: | Faculty of Engineering > Departement of Chemical Engineering | ||||||||
| Depositing User: | Putri Nur Hafiza | ||||||||
| Date Deposited: | 27 Feb 2026 02:42 | ||||||||
| Last Modified: | 27 Feb 2026 02:42 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/49895 |
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