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Aster Rahayu
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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 33 Documents
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Study of Ethylene 1-Hexene Addition on Elongation, Tensile Strength and Cling Values of Stretch Wrap Plastics Helmi Mustafa, Yoga Nawaki; Hanum, Farrah Fadhillah; Rahayu, Aster; Febriani, Annisa Vada
Indonesian Journal of Chemical Engineering Vol. 2 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i1.693

Abstract

Stretch wrap plastic is a very important packaging material on a variety of scales. It provides flexibility, strength, and transparency that make it indispensable for packaging goods efficiently. This research aims to investigate the effect of stretch wrap plastic thickness on its mechanical properties and analyze the impact of ethylene 1-hexene addition on these properties. The research was conducted using stretch wrap plastic samples made from linear low-density polyethylene (LLDPE) with varying thickness and percentage of ethylene 1-hexene addition. The test method involved elongation, tensile strength, and cling testing using a Universal Testing Machine (UTM). The results showed that the thickness of stretch wrap plastic affects its mechanical properties. The thicker the plastic, the higher the elongation and tensile strength values, while the stickiness tends to decrease.  The optimal thickness of stretch wrap plastic is 20 µm. The addition of ethylene 1-hexene also has a positive effect on the elongation and tensile strength properties, with the optimal percentage of addition at 55% with respect to components such as density and melt index
A Review: Analysis Atomic Absorption Spectrometry (AAS) of Heavy Metal Content in Crude Palm Oil Veranica; Rahayu, Aster; Maryudi; Lim , Lee Wah; Anggresani, Lia
Indonesian Journal of Chemical Engineering Vol. 2 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i1.694

Abstract

Indonesia, the world's largest producer of crude palm oil (CPO), turns its oil through a series of refinement processes that include degumming, bleaching, and deodorization before it is used as cooking oil. Still, heavy metals are the main focus of CPO research. Elements known as heavy metals can have harmful effects on the human body, even in small doses. Making sure the amount of metal in CPO doesn't go over the limit is crucial. To find out how much this ingredient contributes to the heavy metal contamination in crude palm oil, more research is required. The CPO refining process is carried out with the aim of reducing free fatty acids and removing dirt or metals dissolved in CPO, which can affect the quality of cooking oil. AAS can detect metals in small amounts and provide analytical differences of up to 0.006 mg/kg.
Optimization of Liquid Organic Fertilizer Production from Tofu Liquid Waste Using EM-4 Activator and Additional Ingredients of Rice Washing Water and Goat Urine Maryudi, Maryudi; Kurniawan, Lutfi; Astuti, Erna; Yahya, Asdarina
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.707

Abstract

Liquid organic fertilizer is organic fertilizer in liquid form which is partly or wholly derived from organic compounds such as plant, animal and industrial waste, either in solid or liquid form. The nutrients contained in it are in the form of a very fine solution so that it is easily absorbed by plants, even the leaves or stems. Organic fertilizer is one solution to restore soil minerals physically, chemically and biologically from the bad effects of synthetic fertilizers. The benefits of liquid organic fertilizer include providing nutrients for plants, improving soil structure, suppressing bacteria that can be detrimental to the soil, and continuous use of soil will improve the physical, chemical and biological properties of the soil as a result being conducive to the environment. In the fermentation process, the role of microbes greatly determines the product produced. The aim of this research is to determine the potential of liquid waste. in the form of liquid organic fertilizer with the addition of goat urine and rice washing water with variations of 15 mL and 30 mL to increase micro and micro nutrients with the bacterial activator EM-4 through a fermentation process. The results of the optimum organic fertilizer content show that the Biological Oxygen Requirement is 969,549 ppm, the Chemical Oxygen Requirement is 14,801.04 ppm and the Total Suspended Solids is 5.360 ppm. Optimal macro nutrient results show Nitrogen 0.2527%, phosphorus 0.1359%, potassium 0.15435%. And the highest degree of acidity (pH) is 4.415. on the first day
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.
The Utilization of Nickel Slag and Oyster Shell to Improve the Concrete Strength Selang, Sartika S.; Maryudi, Maryudi; Mufrodi, Zahrul; Widyaningrum, Sri Rahayu
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.1021

Abstract

The increasing mining industry activity will produce increasing industrial waste. Nickel slag is one of the wastes produced from the nickel refining process by-products that have not been optimally utilized. The chemical composition of nickel slag is mostly silica with a percentage of 47.93%. Silica can be used as a material for making concrete, where a high percentage of silica is expected to strengthen the concrete structure. This study was conducted to determine the effect of nickel slag on the compressive strength of concrete and the right composition in the concrete mixture. The research method used an experimental method with different nickel slag compositions (0%, 5%, 10%, 15%, and 20%) with concrete compressive strength testing at the age of 28 days. The results of the concrete compressive strength test were that the higher the nickel slag content, the higher the compressive strength and flexural strength of the concrete. The addition of shells with different variations (0%, 5%, 10%, 15%, and 20%) showed that the best results were with the addition of 10% shells with a compressive strength of 28.1 MPa. Meanwhile, the water absorption capacity with the lowest absorption power was obtained by adding 20% ​​nickel slag, which was 8.95 %.
Mechanical Characteristics of Concrete with Addition of Nickel Slag Waste as Aggregates Pelupessy, Safriyati; Mufrodi, Zahrul; Suharto, Totok Eka
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.1102

Abstract

Ferronickel slag is a waste product of the nickel metal smelting industry. PT. Virtue Dragon Nickel Industry is a company located in Konawe, Southeast Sulawesi Province, which is the first ferronickel and stainless-steel industrial area in Indonesia. Since 2017 until now, the capacity of the ferronickel smelting industry in the company is 600,000 tons. From the ferronickel smelting process, slag waste of around 3 million tons has also been produced which has not been processed or utilized. Slag waste is feared to disrupt the environment if not managed or utilized properly. This study aims to study the utilization of nickel slag waste as a substitute for fine and coarse aggregate in concrete. This study compares the mechanical properties of concrete using nickel slag material with the use of natural materials in the form of gravel and sand taken from the Konaweha River. The study was started with the preparation of nickel slag in the size of coarse aggregate 10-20 mm, and fine aggregate that passes 20 mesh. Nickel slag was tested for its content or composition. Slag was mixed into a concrete mixture containing sand, gravel, cement with a certain composition. The slag content was added at 0, 10, 20 and 30%. The stirred mixture was then tested for slump with an Abrams cylinder with a lower diameter of 20 cm, an upper diameter of 10 cm and a height of 30 cm. The mixture was molded in the form of a cube measuring 15 cm x 15 cm x 15 cm for density testing and compressive strength testing after 28 days. The test results showed that the largest slag content was silica and iron. The addition of nickel slag provided a slump value that was still included in the type of mixture with good performance. The addition of nickel slag up to 30% increased the density and compressive strength of concrete. The density of concrete increased by 6.7-21.9%. The increase in concrete compressive strength ranges from 8.43 to 33.79%. The mixture with the addition of 20% fine slag has the highest compressive strength of 33.23 MPa.
Utilization of Coal Ash as an Ameliorant to Enhance Growth and Nutrient Availability for Chili Plants (Capsicum annuum L.) on Peat Soil Farrah Fadhillah Hanum; Budi Setya Wardhana; Imran; Annisa Vada Febriani
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.1412

Abstract

Peat soil has limitations in nutrient content and low pH, thus requiring improvement efforts to support optimal plant growth.This study aims to examine the effect of adding coal ash (fly ash and bottom ash) on the growth of chili plants in peat soil media.The research design uses a combination of peat soil, manure, and coal ash from the power plant, which are tested under several treatments.The main parameters observed were plant height and nutrient analysis in the growing medium.The results show that the combination of peat soil, manure, and bottom ash from PLTU 2 (GA-B2B) produced the highest plant growth (26.3 cm).The addition of coal ash increases the CaO content in the growing medium, which plays a role in improving the chemical properties of the soil.However, nitrogen levels tend to decrease with the increase in coal ash dosage.Thus, coal ash has the potential to act as an ameliorant to improve the productivity of peat soil, especially when combined with organic fertilizers.
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.

Page 3 of 4 | Total Record : 33

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