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All Journal Jurnal Akuakultur Rawa Indonesia Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia
Dwi Anggraini
Universitas Sriwijaya
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering

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POTENSI TANAMAN HERBAL SEBAGAI ANTIMIKROBIAL PADA IKAN LELE SANGKURIANG (Clarias sp.) Nora Simatupang; Dwi Anggraini
Jurnal Akuakultur Rawa Indonesia Vol 1, No 2 (2013): JURNAL AKUAKULTUR RAWA INDONESIA
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (158.072 KB) | DOI: 10.36706/jari.v1i2.1730

Abstract

ABSTRACT Motile aeromonad septicaemia (MAS) is caused by the bacterium Aeromonas hydrophila. The use of plant (natural materials) from herbal plants such as garlic, lime, turmeric and mengkudu can be as an alternative way to inhibit the activity of A. hydrophila by their active substances which have potency as an antibacterial and immunostimulant. The aim of this study was to analyze the potential of using a mixture of herbal plants to control of A. hydrophila in catfish sangkuriang (Clarias sp.). There were split in two kind of doses namely, preventive garlic;lemon 0,625% and turmeric;mengkudu 1,5%. The preventive treatment was given for two weeks before challenging test. The curative treatment was performed on one week after challenging test. Challenging test was carried out by intramuscularly injecting of 0,1 mL A. hydrophila (105cfu/ml) into the fish. The results of in vitro at doses of 5% of each extract showed antimicrobial. In the in vivo test, extracts of garlic and lime showed antimicrobial at a doses of 0.625%, while turmeric and mengkudu extracts effective inhibited in a doses of 1,5%. Key word: Herbal plants, antimicrobial, catfish sangkuriang 
Evaluation of Section Shift Converter (HTS and LTS) Catalyst Performance Based on CO Conversion Value, Pressure Drop, and ATE Prahady Susmanto; Alya Putri Yolanda; Riska Puspitasari; Dwi Anggraini
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6401

Abstract

The shift converter process uses Copper-promoted iron (HTS) and Copper/Zinc (LTS) catalysts to convert syngas into hydrogen through the water-gas shift reaction. Catalytic performance evaluation was conducted by analyzing parameters such as Approach Temperature Equilibrium (ATE), pressure drop, and CO conversion. The findings indicate that in the HTS unit, CO conversion ranged from 69% to 75%, with a significant decline to 69% in the fifth data set due to reduced catalyst activity. Key contributing factors to this decrease include catalyst deactivation caused by sintering and poisoning. Within the LTS unit, CO conversion reached a peak value of 94.08% following the catalyst replacement in January 2024. This observed pressure drop also significantly affected catalyst efficiency, as increased pressure drop reduced the contact time between reactant gases and the catalyst, decreasing optimal CO conversion efficiency. ATE analysis showed that the reaction did not always reach the expected thermodynamic equilibrium, particularly in the HTS unit, where ATE values exceeding design specifications indicated inefficient reaction performance. Catalyst efficiency in the shift converter is significantly influenced by catalyst lifespan, pressure drop, and various operational factors, thus requiring routine catalyst replacement to maintain optimal reactor performance.
Co-Authors Alya Putri Yolanda Nora Simatupang Riska Puspitasari Susmanto, Prahady