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All Journal Indonesian Journal of Biotechnology and Biodiversity Jurnal Polimesin
Praswasti PDK Wulan, Praswasti PDK
Universitas Indonesia
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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BIOADSORPSI SPESI SULFUR DALAM ION TIOSULFAT OLEH THIOBACILLUS THIOPARUS DENGAN BANTUAN ZEOLIT ALAM LAMPUNG SEBAGAI MEDIUM ADSORPSI Hidayanto, Ariyo Prabowo; Dianursanti, Dianursanti; Karamah, Eva F; Wulan, Praswasti PDK
Indonesian Journal of Biotechnology and Biodiversity Vol 1, No 1 (2017): Indonesian Journal of Biotechnology and Biodiversity
Publisher : Universitas Esa Unggul

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Abstract

AbstrakSelain dapat menurunkan keekonomisan gas bumi, gas buang yang mengandung senyawa sulfur juga memiliki potensi yang dapat menimbulkan pencemaran udara jika terlepas ke udara. Untuk mengurangi kadar senyawa ini, proses bioadsorpsi dapat digunakan dengan menggabungkan proses degradasi oleh aktivitas mikroba dalam hal ini melalui aktivitas bakteri Thiobacillus thioparus dengan proses adsorpsi melalui bantuan material berpori yaitu zeolit alam Lampung sebagai adsorben. Pada tahap pembuatan medium dan fase tumbuh kultur Thiobacillus thioparus, koloni sel dijaga pada fase log yang akan terbentuk mulai hari ke 4 dan berhenti pada hari ke 8 dengan pH optimum harus stabil pada rentang 6 – 8. Pada fase inilah kultur digunakan pada proses bioadsorpsi. Zeolit sebagai bahan pengisi kolom bioadsorpsi juga sebelumnya di preparasi dengan proses mekanik untuk menyeragamkan ukuran diameter partikel yaitu sebesar ± 1 – 2 mm. BET autosorb digunakan untuk mengetahui profil fisik dari zeolit yaitu luas permukaan, volume pori, dan diameter pori. Pada proses bioadsorpsi, persentase reduksi tertinggi spesi sulfur pada ion tiosulfat dicapai sebesar 41,31 % pada jam ke 8. Sedangkan, proses bioadsorpsi akan terus berlanjut sampai mencapai jam ke 24 hingga tak tersedianya lagi sulfur yang dapat didegradasi oleh Thiobacillus thioparus, maka sel memasuki fase kematian hingga mengakhiri proses yang terjadi.Kata kunci : Thiobacillus thioparus, zeolit alam lampung, bioadsorpsi
Hydrogen co-firing simulation for emission reduction and efficiency in an 880 MW combined cycle power plant Mulyadi, Eka Octaviyatna; Wulan, Praswasti PDK
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.6735

Abstract

This study evaluates the environmental and performance impacts of hydrogen co-firing with natural gas in an 880 MW Combined Cycle Power Plant (CCPP) in Jakarta, Indonesia. CO₂ emissions were estimated using the IPCC Tier-2 Method, while Aspen Plus simulation analyzed combustion performance under 10% and 20% hydrogen blending. Fuel composition was determined through Gas Chromatography analysis and processed using a weighted average method. The results show that hydrogen blending significantly reduces CO₂ emissions to approximately 10% at 10% hydrogen and 20% at 20% hydrogen, equivalent to 409,420 tons annually. NOₓ emissions increased moderately, by about 2.16% at 20% hydrogen, due to higher flame temperatures, yet remained far below  regulatory limit of 400 mg/Nm³. Thermal efficiency improved from 54.08% (baseline) to 56.88% and 60.06% with 10% and 20% hydrogen, respectively, although net power output slightly declined. These findings highlight the role of hydrogen as a transitional energy carrier, capable of decarbonizing gas-fired power plants while improving efficiency with manageable environmental trade-offs. Although the study is based on steady-state simulations without pilot-scale validation, the integration of actual operational data strengthens its applicability. Hydrogen co-firing presents a technically viable pathway for reducing CO₂ emissions in the power sector.
Co-Authors Desi Heltina Dianursanti Hidayanto, Ariyo Prabowo Ismail Marzuki Kamarza Mulia, Kamarza Karamah, Eva F Mahmud Sudibandriyo, Mahmud Mubarokah Nuriaini Dewi Mulyadi, Eka Octaviyatna Slamet . Wahyu Widodo Widodo Wahyu Purwanto Yuswan Muharam