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Aster Rahayu
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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. 2 No. 2 (2024)" : 5 Documents clear
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
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.
Review : Exploration of Squalene from Natural Materials as its Potential in Health and Food Fields Permadi, Adi; Wilson, Mutiara
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.v2i2.1423

Abstract

Squalene, a natural isoprenoid, plays a critical role in sterol biosynthesis and exhibits various health benefits, including antioxidant, anti-inflammatory, and antitumor properties. Found in sources such as shark liver oil, amaranth, olive oil, and microbial species, its demand has surged across pharmaceutical, cosmetic, and food industries. However, traditional extraction methods, predominantly from shark liver, raise sustainability concerns. This study explores alternative sources and production strategies, focusing on plant-based and microbial synthesis of squalene. Amaranth seeds and olive oil were highlighted as promising renewable sources due to their high squalene content. Advances in synthetic biology and metabolic engineering have enabled microbial platforms, such as genetically modified yeasts and microalgae, to produce pharmaceutical-grade squalene sustainably. Moreover, the development of innovative extraction techniques, such as supercritical CO₂ extraction, enhances yield and purity while minimizing environmental impact. The research further emphasizes squalene’s potential as a precursor for cholesterol, hormones, and vitamins, alongside its role in improving human health through applications in vaccines, cardiovascular protection, and cancer prevention. Future work should prioritize optimizing extraction methods, exploring untapped natural sources, and scaling microbial production to address the growing global demand sustainably.

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