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All Journal Jurnal Teknik Mesin Indonesia Advance Sustainable Science, Engineering and Technology (ASSET)
Francisca Gayuh Utami Dewi
Universitas Brawijaya
Aerospace Engineering Automotive Engineering Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh persentase CO2 terhadap temperatur dan kecepatan api premixed laminar pada oxy-butane combustion Lilis Yuliati; Francisca Gayuh Utami Dewi; Ichtiaraka Amarullah
Jurnal Teknik Mesin Indonesia Vol. 18 No. 1 (2023): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v18i1.428

Abstract

Oxy-combustion is one of the technologies developed to reduce the amount of CO2 released into the atmosphere in order to reduce the greenhouse effect and global warming. Gas recirculation in oxy-combustion results in the presence of CO2 in the oxidizer. This study was conducted to determine the effect of the percentage of CO2 on the laminar premixed flame speed in the oxy-butane combustion process. Experiment was conducted on equivalent ratios of 0.6, 0.8, 1, 1.2 and 1.4. CO2 content were varied by 50%, 55%, 60%, 65% and 70%, calculated based on the amount of oxygen in the combustion process. The measurement of laminar premixed flame speed was carried out on a cylindrical tube burner. The results showed that the flame temperature and the laminar premixed flame speed decreased with the increasing of CO2 percentage in the oxidizer. The presence of CO2 causes the heat generated from the combustion process absorbed by CO2, so that the flame temperature is reduced. The decreasing in the flame temperature is an important factor which caused the decreasing in laminar premixed flame speed in a mixture with CO2 content. Furthermore, the presence of CO2 in the reactants prevents the butane and oxygen from mixing and reacting, hence the flame speed becomes lower. In addition, it is known that for every percentage of CO2 in the oxidizer, the flame has a maximum flame temperature and speed at an equivalent ratio of unity.
Comparative Efficacy of Two Bamboo-Derived Activated Carbons for Hospital Wastewater Remediation Putu Hadi Setyarini; Hanum Surya Pembayun; Dwi Hadi Sulistyarini; Nuretha Hevy Purwaningtyas; Francisca Gayuh Utami Dewi
Advance Sustainable Science Engineering and Technology Vol. 7 No. 3 (2025): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i3.1895

Abstract

Liquid medical waste containing pathogens and hazardous chemicals can pollute the environment and endanger human health. The increasing volume of waste during the COVID-19 pandemic adds urgency to find effective and sustainable treatment methods. However, environmentally friendly and efficient solutions are still limited. This study aims to explore the utilization of activated carbon from two local bamboo species, Gigantochloa apus (GA) and Bambusa vulgaris (BV) as alternative adsorbents in the treatment of liquid medical waste. Two-year-old bamboo was traditionally carbonized and activated using 0.3 M sodium chloride solution. The 50 mesh charcoal powder was tested using BET surface area analysis with QUADRASORB evo™ instrument, morphology using FESEM (FEI Quanta 650), and pollutant reduction efficiency through pH, TDS (HAIK EZ 9909), COD (HACH DBR 200 closed reflux method), and BOD (Winkler method with BOD 6 VELP system) measurements. The results showed that GA activated carbon exhibited a much higher adsorption capacity due to its larger BET surface area compared to BV. In addition, pH and Total Dissolved Solids (TDS) analysis showed that wastewater treated with GA activated carbon exhibited a greater reduction in TDS levels. The study also evaluated the reduction of Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD), which confirmed that GA provided higher pollutant removal efficiency than BV. These findings underscore the potential of GA and BV as effective adsorbents for medical wastewater treatment, offering a sustainable solution to improve water quality and reduce environmental impacts associated with liquid medical waste.
Co-Authors Dwi Hadi Sulistyarini Hanum Surya Pembayun Ichtiaraka Amarullah Lilis Yuliati Nuretha Hevy Purwaningtyas Putu Hadi Setyarini