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Resti Nurmala Dewi
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Jurusan Teknik Kimia Universitas Syiah Kuala, Jl. Tgk. Syech Abdur Rauf No.7, Kopelma Darussalam, Banda Aceh, INDONESIA
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JURNAL REKAYASA KIMIA & LINGKUNGAN
Published by Universitas Syiah Kuala
ISSN : 14125064     EISSN : 23561661     DOI : https://doi.org/10.23955/rkl.v18i2.34018
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Engineering
The Journal of Chemical Engineering and Environment is an open access journal that publishes papers on chemical engineering and environmental engineering. The following topics are included in these sciences: Food and biochemical engineering Catalytic reaction engineering Clean energy technology Environmental and safety technology Fundamentals of chemical engineering and applied industrial engineering Industrial chemical engineering Material science engineering Process and control engineering Polymer and petrochemical technology Membrane technology Agro-industrial technology Separation and purification technology Environmental modelling Environmental and information sciences Water and waste water treatment and management Material flow analysis Mechanisms of clean development
Arjuna Subject : Teknik Kimia (semua kategori) - Bioengineering
Articles 319 Documents
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Pemanfaatan Zeolit Alam Teraktivasi untuk Adsorpsi Logam Krom (Cr3+) Emelda, Lisanti; Putri, Suhardini Martiana; Ginting, Simparmin
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 4 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i4.1229

Abstract

Pertukaran ion antara Cr3+ dan H+ menggunakan zeolit sebagai penukar ion adalah salah satu metode untuk memurnikan air dari ion kromium. Zeolit adalah senyawa aluminosilikat tetrahedral dengan struktur ikatan 3-dimesi, memiliki pori bagian dalam, dan luas permukaan yang tinggi, karena itu dapat digunakan sebagai adsorben. Tujuan penelitian ini adalah untuk mengevaluasi pengaruh waktu kontak optimum, suhu, dan konsentrasi kromium terhadap kapasitas penyerapan. Tahap pertama adalah mencampur zeolit yang telah diaktifkan dengan larutan kromium (10 ppm kromium) dalam tangki berpengaduk pada 25oC. Selanjutnya larutan diambil setiap 60 menit hingga konsentrasi residu larutan kromium konstan. Proses adsorpsi dilangsungkan pada suhu berbeda yaitu: 25, 30, 35, 40, 45, dan 50 oC. Untuk uji adsorpsi isotermal, pada suhu dengan hasil penyerapan terbaik divariasikan konsentrasi kromiumnya yaitu: 10, 20, 40, 60, dan 100 ppm. Dosis adsorben yang digunakan adalah 3 gram adsorbent/200 mL larutan krommium dengan kecepatan pengaduk 240 rpm. Larutan kromium dideteksi dengan menggunakan Atomic Absorption Spectroscopy (AAS) atau Spektroskopi Serapan Atom. Waktu kontak optimum diperoleh 3 jam menggunakan zeolit yang diaktifkan dengan asam, diperoleh nilai adsorpsi optimum 99,275%. Proses adsorpsi berjalan secara eksoterm, memiliki ?Ho = -3.9574,6 J/mol dan ?So = -117.227 J/moloK. Model isotermal adsorpsi mengikuti isoterm Freundlich menurut persamaan Qe = 0,044463C1/2,5125, kapasitas penyerapan Kf = 0,044463 mmol/gram adsorben, dan intensitas adsorpsi n = 2,5125.
Kajian Kinerja Penukar Panas Tipe Shell and Tube Satu Haluan dengan Pengontrolan Suhu Outlet Syah, Hendri
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 4 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i4.1228

Abstract

Kajian ini bertujuan untuk menentukan kinerja penukar panas tipe shell and tube dengan pengaturan suhu outlet. Penukar panas yang digunakan dalam kajian ini adalah penukar panas tipe shell and tube dengan bahan bakar kerosen. Parameter kinerja yang dianalisis adalah konsumsi kerosen, suhu keluaran, koefisien perpindahan panas keseluruhan, laju perpindahan panas, number of heat transfer units (NTU), dan efektivitas. Hasilnya menunjukkan bahwa laju perpindahan panas dalam penukar panas berkisar dari 69,24 hingga 83,13 kW. Energi panas yang dihasilkan dalam eksperimen III lebih tinggi karena temperaturnya paling tinggi, ini berbeda dengan efektivitas dan NTU-nya karena masing-masing memiliki nilai terendah (0,77 dan 2,55). Perbedaan tekanan total yang terjadi dalam penukar panas tersebut adalah 366,8 Pa. Nilai ini jauh lebih kecil dibandingkan tekanan statik kipas yang dipakai yaitu 78 mm H2O.
Feasibility of In-Situ Aeration of Old Dumping Ground for Land Reclamation Tong, Huan-Huan; Yin, Ke; Chia, Charles Yong-Han; Ahmad, Omar; Xin, Ling; Wang, Jing-Yuan
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 4 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i4.1227

Abstract

Dumping grounds are characterized by the absence of engineering controls such as base liners and cover layer. Consequently, these dumping grounds present risks for surrounding resources such as soil, groundwater and air. The concern for groundwater contamination by leachate from tropical dumping grounds is heightened due to the greater amounts of rainfall and subsequent infiltration and percolation through the waste mass. The emergent demand for old dumping grounds reclamation drives the need to employ remediation technologies. Generally, in-situ aeration is a remediation method that promotes aerobic conditions in the later stage of dumping ground. It accelerates carbon transfer, reduces remaining organic load, and generally shortens the post closure period. However, high rainfall in tropical areas straitens this technique. For example, pollutants could be easily flushed out and more energy should be required to overcome hydrostatic pressure. Although heavy rainfall could supply sufficient water to the substrate and accelerate degradation of organic matter, it may inhibit aerobic activities due to limited air transfer. The waste characterization from Lorong Halus Dumping Ground (closed dumping ground in Singapore) showed that the waste materials were stabilized after 22 years closure. According to the Waste Acceptance Criteria set by European Communities Council, the waste materials could be classified as inert wastes. One interesting finding was that leachate layer detected was about of 5 - 8 meter depth, which entirely soaked the waste materials. Hence, the reclamation design and operation should be carefully adjusted according to these characters. Lorong Halus Dumping Ground case study can provide a guideline for other tropical closed landfills or dumping grounds.
Effect of Inoculum Age, Carbon and Nitrogen Sources on the Production of Lipase by Candida Cylindracea 2031 in Batch Fermentation Noor, I. M.; Hasan, M.; Ramachandran, K. B.
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Production of extracellular lipase by Candida cylindracea DSMZ 2031 was studied in a seven liters batch bioreactor, using palm oil (PO), palmitic acid (PA), lauric acid (LA), olive oil (OO) and cooking oil (CO) as carbon source. The effect of carbon and nitrogen sources were studied by measuring the lipase activity. The maximum lipase activity was found to be 12.7 kLU on palm oil as carbon source, urea as nitrogen sources and at 36 h inoculum age. This was achieved at a temperature of 30o C, pH of 6.0, agitation speed of 500 rpm and aeration of 1vvm.
Hydrogen Absorbing Material in Carbonaceous-Metal Hydride Mulana, Farid
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

One of the most promising materials for storing hydrogen in solid state would be included in metal-carbon composites. In order to obtain nanocrystalline metal particles encapsulated by crystalline or amorphous carbon, mechanosynthesis of zirconium-carbonaceous composites and alkali metal-carbonaceous composites was performed. For zirconium-carbonaceous composites, only zirconium-carbon black composite absorbed more hydrogen than expected for a mere mixture with the same composition. The higher hydrogen capacity on the zirconium-carbon black composite would be due to some specific sites on the carbonaceous material created during the milling. Another effect of the composite formation was stabilization of zirconium, that is, the composites did not ignite in air. On alkali metal-carbonaceous composites, carbon black has superior effect in composite formation compared with graphite in which some cooperative effect was only detected on alkali metal-carbon black composite. The effect of the carbonaceous composite formation was resistance to air and anti-sticking characteristics to balls and the wall of the vial during the ball milling.
Rapid Determination of Microbial Quinones using Supercritical CO2 Extraction Faisal, Muhammad; Irvan, Irvan; Atsuta, Yoichi; Daimon, Hiroyuki; Fujie, Koichi
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

The supercritical CO2 extraction of microbial quinones from activated sludge samples obtained from various activated sludge was investigated and compared to the conventional method using organic solvent extraction. The extraction was carried out in a supercritical fluid extraction (SFE) system in the temperature range of 25 to75 oC and the pressure up to 30 MPa. Different extraction conditions, such as the temperature, pressure, extraction time and modifier were employed to maximize the SFE efficiency. Significant amount of microbial quinones (ubiquinones and menaquinones) could be extracted rapidly with supercritical CO2. Results on the value of diversity and dissimilarity suggested that the SFE with supercritical CO2 extraction was a reliable technique for quinones extraction.
Pembuatan Membran Komposit Khitosan-Selulosa dari Limbah Kulit Kepala Udang Aprilia, Sri
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Khitosan adalah produk yang dapat diasetilasi dari khitin, dan banyak terdapat di alam. Khitin diisolasi dari limbah kulit udang yang merupakan polimer alam yang mempunyai struktur mirip dengan selulosa. Khitosan ini bersifat hidrofilik dan merupakan material biodegradable. Dengan pesatnya teknologi pemisahan, maka khitosan telah digunakan sebagai bahan pembuat membran. Membran khitosan bersifat hidrofilik yang memiliki kemampuan yang tinggi dalam melewatkan permeat berupa air. Pada penelitian ini khitosan diisolasi dari khitin pada temperatur 120oC dan waktu deasetilasi 120 menit. Kandungan air yang diperoleh adalah 7% dan kandungan abu adalah 1,28%. Membran komposit khitosan dan selulosa dibuat dengan metode inversi fasa dan teknik polimerisasi antar muka. Hasil peneletian dilakukan karakterisasi membran dengan permeasi pelarut. Fluks besar diperoleh pada membran dengan konsentrasi khitosan terkecil yaitu 0,25%. Koefisien permeabilitas (Lp) terbesar diperoleh pada membran dengan konsentrasi khitosan 0,25%, yaitu sebesar 1,522 l/m2jam bar.
Use of Reactive Distillation for Biodiesel Production: A Literature Survey Supardan, Muhammad Dani; Satriana, Satriana
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Biodiesel has been shown to be the best substitute for fossil-based fuels to its environmental advantages and renewable resource availability. There is a great demand for the commercialization of biodiesel production, which in turn calls for a technically and economically reactor technology. The production of biodiesel in existing batch and continuous-flow processes requires excess alcohol, typically 100%, over the stoichiometric molar requirement in order to drive the chemical reaction to completion. In this study, a novel reactor system using a reactive distillation (RD) technique was discussed for biodiesel production. RD is a chemical unit operation in which chemical reactions and separations occur simultaneously in one unit. It is an effective alternative to the classical combination of reactor and separation units especially when involving reversible or consecutive chemical reactions such as transesterication process in biodiesel production.
Batch and Continuous Lactic Acid Production from Cassava by Streptococcus bovis Razi, Fachrul; Yuwono, S D
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Process variables were optimized for the production of lactic acid from cassava by Streptococcus bovis for batch and continuous fermentations. In the batch fermentation, maximum yield 82.5% and maximum lactic acid productivity 2.43 was achieved at 39 oC, pH 5.5 with 50 g/l cassava concentration. In the continuous fermentation maximum productivity lactic acid 1.25 g/l.h was obtained at dilution rate 0.05 /h.
Studi Oksidasi Etanol Menjadi Asetaldehida Menggunakan Katalis Molibdenum Oksida Berpenyangga Al2O3, TiO2, dan SiO2 Husin, Husni; Hasfita, Fikri
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Penelitian ini bertujuan untuk mengevaluasi pengaruh penyangga Al2O3, SiO2, dan TiO2 pada MoO3 terhadap kinerjanya dalam oksidasi etanol menjadi asealdehida. Katalis disiapkan dengan metode impregnasi dengan kandungan MoO3 of 25% dan 50%. Hasil identifikasi dengan X-ray Difraction (XRD) menunjukkan bahwa komponen katalis terdiri dari kristal MoO3, TiO2, Al2O3, dan SiO2. Reaksi uji kinerja katalis dilangsungkan dalam reaktor pipa lurus berunggun tetap, beroperasi pada 150-300oC dan tekanan atmosfir. Produk dianalisis menggunakan gas kromatografi GC 8A buatan Shimadzu dengan kolom porapak Q 80/100 mesh. Konversi etanol tertinggi diperoleh 83% menggunakan katalis 50%MoO3/TiO2. Selektivitas asetaldehida tertinggi dihasilkan 96% menggunakan katalis 25%MoO3/SiO2. Yield asetadehida tertinggi dicapai 51% menggunakan katalis 25%MoO3/TiO2.Kata kunci: katalis MoO3/TiO2, Al2O3, SiO2, impregnasi, oksidasi etanol, asetaldehida

Page 20 of 32 | Total Record : 319

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