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Aster Rahayu
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ijce@che.uad.ac.id
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Campus IV, Jl. Ringroad Selatan, Kragilan, Tamanan, Kec. Banguntapan, Bantul, Daerah Istimewa Yogyakarta 55191.
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INDONESIA
Indonesian Journal of Chemical Engineering
Published by Universitas Ahmad Dahlan
ISSN : -     EISSN : 30256674     DOI : https://doi.org/10.26555/ijce
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Materials Science & Nanotechnology
Indonesian Journal of Chemical Engineering aims to provide an international platform for scientists, researchers, and academicians to promote, share and discuss new findings, current issues, and developments in the different areas of Chemical Engineering. This journal encourages a forum for publishing research related to the Sciences, Energy, Environmental and Food Pharmaceutical fields. This journal encompasses Original Research Articles, Review Articles, and Short Communications, including Fundamental and applied chemical reaction engineering, Materials engineering, Catalyst, Environmental chemical engineering, Sustainable science and engineering, Food, Drugs and Cosmetics, Renewable energy (Biomass and Hydropower) and Non-Renewable energy (petroleum, natural gas and coal).
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 3 No. 1 (2025)" : 5 Documents clear
Optimizing Catalyst Loading for Improved Quality of SF-05 in Hydrocracker Reactor C-3-03B at HCU RU V Balikpapan Adi Sampurno; Totok Eka Suharto; Zahrul Mufrodi
Indonesian Journal of Chemical Engineering Vol. 3 No. 1 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v3i1.873

Abstract

PT Kilang Pertamina Internasional RU V Balikpapan innovated the Unibon Hydrocracker unit to increase the production of Smooth Fluid (SF-05), a high-quality base oil for drilling mud. Because the catalyst was approaching the end of run and the product did not yet meet specifications, the catalyst (Change of Catalyst - COC) was replaced with a new configuration in Reactor I C-3-03B. This research aims to optimize the hydrocracking process by changing catalyst loading and operating settings for the C-3-16B fractionation column. It is hoped that this effort will produce high-quality SF-05, meet market demand, and increase efficiency and environmental friendliness. The research results show that the Smooth Fluid SF-05 product meets all specifications with an average hydrogen consumption of 231,649 Nm3/m3 (purity 94.83%) in the HCU Train B reactor. This condition helps improve the quality of products that are more competitive in the market, thus having a positive impact on increasing company profits. Hydrogen consumption is influenced by various process variables and increases with changes in hydrogen partial pressure, CFR, H2/HC ratio, conversion rate, WABT, and LHSV. All process variables are still within the specified operating design range.
Evaluation of Conventional Methods in Reducing Heavy Metal Concentrations in Industrial Waste Nurmustaqimah; Zahrul Mufrodi; Siti Jamilatun
Indonesian Journal of Chemical Engineering Vol. 3 No. 1 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v3i1.1413

Abstract

The rapid growth of the chemical industry has increased liquid waste containing heavy metals (Cadmium, Zinc, Lead), which threaten ecosystems and human health due to persistence and biomagnification. The handling of these effluents requires specific methods according to the characteristics of the effluents. Electrochemical processes stand out in heavy metal removal efficiency, while adsorption using natural materials (fruit peels, sawdust) offers lowcost effectiveness. Ion flotation utilizes surfactants, although its efficiency depends on operational conditions. Chemical precipitation with lime is a cheap solution to reduce metal solubility, while phytoremediation relies on plants as an environmentally friendly alternative. The selection of methods is based on the type of metal, waste concentration, and economic-environmental factors. The implementation of this appropriate technology is expected to minimize the risk of heavy metal pollution in a sustainable manner.
Utilization of Snails as Liquid Organic Fertilizer (POC) with the Anaerobic Composter Tube Method Syahrani Pramia Lestari; Dwi Rossani Nur Afifah; Lukhi Mulia Shitophyta; Aster Rahayu
Indonesian Journal of Chemical Engineering Vol. 3 No. 1 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v3i1.1414

Abstract

Indonesia is a country with thousands of islands inhabited by flora and fauna, with these conditions, many organisms such as snails are found. Snails are often considered pests by vegetable farmers. Snails contain amino acids, nitrogen, phosphorus, potassium, and protein that can help increase plant growth and development. The purpose of this study was to utilize snails as liquid organic fertilizer, to find out the process of making liquid organic fertilizer from snails, to find out the differences in the content of liquid organic fertilizer from the three samples, to find out the comparison of growth in eggplant as a test medium, and to find out the effect of the comparison of molasses and snails. The research methods include preparation of raw materials, boiling and crushing snails, mixing materials, and the fermentation process. After that, the fertilizer from the study was analyzed to determine the content of N, P, K. The results showed that for the analysis of NPK content obtained in a sample of 100 grams of snails, the N content value was 0.028%, P 2 O 5 0.016%, K 2 O 0.003%. In a sample of 300 grams of snails, the N content value is 0.041%, P 2 O 5 0.043%, K 2 O 0.050%. Comparative analysis of purple eggplant plants given snail POC and not given snail POC can be seen the difference in stem height and leaf width. In sample 1 which was not given snail POC, the stem height was 9 cm and the leaf width was 5.4 cm, sample 2 with 100 grams of snails had a stem height of 11.2 cm and a leaf width of 7.1 cm, in sample 3 with 300 grams of snails had a stem height of 12.3 cm and a leaf width of 7.7 cm, while in sample 4 with 500 grams of snails which had a stem height of 15.4 cm and a leaf width of 9.5 cm. This shows that sample 4 with 500 grams of snails has a very good growth rate. The differences in the research test results are due to differences in the dosage or variation and weight of snails and molasses given to each sample.  
Metal Adsorption in Batik Liquid Waste Using Adsorbents from Duck Eggshell and Durian Skin Waste Huda, Muhammad Farkhan Fikri; Mustopa; Aktawan, Agus; Hakika, Dhias Cahya
Indonesian Journal of Chemical Engineering Vol. 3 No. 1 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v3i1.1419

Abstract

If industrial factory waste is directly disposed of into the surrounding environment, it can cause pollution, damaging the areas affected by the waste. Therefore, it is necessary to process the waste to reduce the harmful substances contained in the waste. This study conducted an experiment to reduce the metal content in batik liquid waste (Cu and Cd) using duck egg shells and durian peels as adsorbents. Before the production of activated charcoal, the duck egg shells and durian skins were washed and then sun-dried. Next, the duck egg shells are crushed into small granules, and the durian skins are cut into small pieces to facilitate carbonization. The carbonization process is carried out using a device called a furnace at a temperature of 600 °C for 2 hours for duck egg shells, and 300 °C for 1 hour for durian peels. Then, the obtained charcoal is ground and sieved using a 140 mesh sieve, followed by activation using a 4 N H3PO4 solution for 24 hours. The adsorption process is differentiated based on variations in contact time of 30, 90, and 180 minutes as the independent variable in the study, with adsorbent weight and stirring speed as the constant variables. After being analyzed using atomic absorption spectrophotometry, a reduction in Cu metal content by 27% and Cd metal content by 19% was obtained. The pH decreased from 13 to 10.
Optimizing Hospital Waste Management Systems through Statistical Approaches: Evidence from a Central Java Hospital Adi Permadi; Viola Lulu Aulia; Aulia Audistia Rohmah; Tiara Eka Supriyanti; Ahmad Lupi
Indonesian Journal of Chemical Engineering Vol. 3 No. 1 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v3i1.1425

Abstract

Hospital wastewater contains various contaminants that can endanger both environmental and public health if not managed properly. This study investigates the optimization of a hospital wastewater treatment system in Purwokerto using descriptive statistical analysis. Data were collected for the year 2023 from one hospital and included parameters such as Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), ammonia, oils and grease, pH, total coliform, and several heavy metals including cadmium. Results indicate that most parameters met environmental quality standards set by the Ministry of Environment Regulation No. 68/2016, except for total coliform and cadmium, which occasionally exceeded the thresholds. The study suggests several optimization strategies including improved disinfection methods, regular monitoring, technological upgrades, and better staff training to enhance the treatment system's efficiency and ensure compliance with environmental regulations.

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