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Eksergi: Chemical Engineering Journal
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 1410394X     EISSN : 24608203     DOI : https://doi.org/10.31315
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Eksergi is an open-access, peer-reviewed scientific journal that focuses on research and innovation in the fields of energy and renewable energy. The journal aims to provide a platform for scientists, researchers, engineers, and practitioners to share knowledge and advancements that contribute to sustainable development and energy transition. In addition to energy topics, the journal also accepts high-quality manuscripts related to, but not limited to, the following areas: Separation processes Bioprocesses related to food, energy, and environmental applications Wastewater treatment and resource recovery Process optimization and intensification Carbon capture, utilization, and storage (CCUS) Chemical reaction engineering and reactor design Life cycle assessment (LCA) and sustainability evaluation Process Design and Control Engineering Process Simulations Process System Engineering The journal welcomes original research articles, reviews, and short communications that demonstrate novelty, scientific rigor, and relevance to chemical engineering and interdisciplinary applications.
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 6 Documents
 1 
Search results for , issue "Vol 16, No 2 (2019)" : 6 Documents clear
Aplikasi Tuning Metode Cohen-Coon pada Pengendali pH di Tangki Neutralisasi, Unit Pengolahan Limbah Profiyanti Hermien Suharti; Khalimatus Sa&#039;diyah
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.2993

Abstract

Wastewater generated in industry should be treated, in order to meet the standards set by the Government. pH became important parameters in the process of wastewater treatment. One of waste in industrial synthetic fibers contain ions that make pH of wastewater ranged from 2 to 3. The value of the threshold for the pH of the wastewater, based on regulation of the Minister of environment, ranged from 6 to 9. The main process to achieve this standar was the neutralization process. In order to fulfilment the pH target, pH controller has been used to monitor the pH at neutralization tank. pH controller which is used is a type of PID (proportional, integral, derivative) controller. The PID parameter that used in the controller are proportional gain (Kc) 10, integral time (τi) 1 minutes and 10 second as derivative time (τD). This parameter yields an oscillation response. This research aims to get the optimum PID parameters that can be applied to keep wastewater pH around 7. The experiment results show that the parameters of the PID controller Kc = 0.251, τi = 151 second = 2.51 minutes and τD = 12.5 second, had better performance than the PID controller parameters used previously.
Pelindian Neodymium dari Magnetik Coal Fly Ash menggunakan Asam Asetat sebagai Pelarut haries handoyo; I Made Bendiyasa; Agus Prasetya
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.3027

Abstract

Neodymium (Nd) has been known as a vital component in the modern industry such as for very strong permanent magnets (NdFeB magnet). Some countries are starting to look for alternative sources of Nd such as coal fly ash (CFA), which is the waste from coal combustion. This study aims to look at the potential for Nd extraction from CFA using acetic acid at atmospheric pressure. The effect of CH3COOH concentrations (0,1-1,0 N), and leaching temperature (26-60 oC) was investigated. The experiment was carried out under a constant agitation speed (400 rpm), S/L ratio (3,75 % (W/V)) and CFA particle size (-400 mesh). The highest leaching eficiencies (72%) were achieved for concentration of acetic acid 0,5 N at 60 oC. The leaching kinetics results showed that it best fits the shrinking core model: [t.kap=1-3(1-XB) 2/3 +2(1-XB)] ensuring the overall leaching process is controlled by difussion ash layer. The activation energy determined from the experimental study was of 15,38 kJ/mol.
METODE KOAGULASI DAN ELEKTROKOAGULASI DENGAN PENAMBAHAN HIDROGEN PEROKSIDA PADA PROSES PENGOLAHAN LIMBAH CAIR BUANGAN LAUNDRY Bambang Hari Prabowo; Hendriyana Hendriyana; Lulu Nurdini; Mutiara C. Firdaus; Tengku Leinaldy P.
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.2812

Abstract

Problems with laundry waste, especially in the content of surfactants in detergents. Surfactants have properties as surface tension reducers. In the body of water can cause foam that can mediate itching. As domestic waste, this laundry waste is generally disposed directly to the environment without any treatment, which if left unchecked, of course, will be bad for the environment. The content in laundry wastes such as COD, BOD, TDS, pH, phosphate level and turbidity that do not comply with quality standards can cause polluted environments and can disrupt public health and the environment. In this study, two water treatment methods were applied, namely coagulation and electrocoagulation by adding 7 ml of 5% peroxide. This research was carried out in a batch process both electrocoagulation and coagulation. The parameters reviewed were COD, TSS, pH, phosphate level, PO4- and turbidity. Coagulation using alum coagulant (Aluminum sulfate). The variation of the two coagulation processes is, for coagulation, the stirring speed is 300 rpm for 10 minutes and the coagulant dose (500 ppm, 600 ppm, 700 ppm, 800 ppm and 900 ppm). In electrocoagulation contact times were varied (15 minutes, 20 minutes, 25 minutes, 30 minutes). The best results obtained were wastewater treatment using the Electrocoagulation method with a COD reduction of 76%, BOD 83%, turbidity 98% and phosphate 99.9%.
Karakteristik Hidroksiapatit Porous dari Prekursor Cangkang Keong Sawah dan Bahan Porogen Pati Sukun Endang Sulistyawati; Robertinus Filustra Siregar Siregar
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.3082

Abstract

Hydroxyapatite [Ca10(PO)4(OH)2] is a biomaterial used in bone implants to repair damaged tissue bones. Hydroxyapatite has biocompatible and osteoconductive properties. Hydroxyapatite synthesis is carried out by reacting Ca and P with a mole ratio of 1,67. One source of calcium precursors is conch shell with a CaCO3 content of 48,02%. The addition of porogen breadfruit starch serves to form pores so that it can accelerate the process of nutrient infiltration in bone. The study began with the calcination of conch shells at 900oC for 4 hours, to obtain calcium oxide (CaO) compounds. Calcium and phosphate reactions were carried out at 60oC and the stirring time was 3 hours. The hydroxyapatite produced was sintered at 900oC for 4 hours and analyzed using FTIR, AAS, UV-VIS, SEM, XRD, and compressive strength. The analysis solid and porous hydroxyapatite showed a comparison of calcium and phosphorus respectively 1.677 and 1.673, so that hydroxyapatite was close to the hydroxyapatite standard. Hydroxyapatite dense has a particle size of 0.396 μm, while porous hydroxyapatite has a particle size of 0.9135 μm and a pore of 0.655 μm. Hydroxyapatite dense and porous compressive strength are 19.61 MPa and 9,807 MPa respectively, so porous hydroxyapatite is more effective in nutrient infiltration to repair bone damage.
Chitosan Concentration and Cross-linker Volume Effect on The Release Kinetic of Red Ginger Oleoresin Microcapsule in Simulated Intestinal Fluid (SIF) Medium Jayanudin Jayanudin; Moh. Fahrurrozi; Sang Kompiang Wirawan; Rochmadi Rochmadi
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.3088

Abstract

Red ginger oleoresin contains components that can be used as antioxidants. Release kinetics studies are used to provide doses to achieve the desired drug concentration. The purpose of this study was to determine the release kinetics of red ginger oleoresin microcapsules based on changes in chitosan concentration and volume of cross-linker and determine the diffusion coefficient of red ginger oleoresin through microcapsule walls. Red ginger oleoresin microcapsules were prepared from a mixture of red ginger oleoresin in chitosan solution and stirred to form an emulsion. After that, it was added to corn oil and stirred again to form a second emulsion. Glutaraldehyde saturated toluene was added dropwise after finished added the 25% glutaraldehyde solution and remains stirred for 2 hours. Red ginger oleoresin microcapsules were separated and washed with petroleum ether and hexane, then dried in an oven. Microcapsules inserted in the release medium (simulated intestinal fluid) without enzymes, and then the samples were analyzed using a UV-vis spectrophotometer to determine the absorbance. The release kinetics models used were zero order, first order, Higuchi, Korsmeyer-Peppas, and Hixon-Crowell. The highest correlation coefficient (R2) was obtained from the Korsmeyer-Peppas release kinetics model, R2 = 0.73-0.85 with the value of n = 0.39-0.41. Based on the n value, the release mechanism of red ginger oleoresin microcapsules was Fickian diffusion. The diffusion coefficients obtained were 2,807 x 10-13 - 3,675 x 10-13 cm2 /sec.
Penumbuhan ZnO Rods Terdoping CeO2 Pada Substrat Kaca Menggunakan Metode Hidrotermal Rina Dewi Mayasari; Yuliani H; Deni Y; Masmui M; Raharjo J; Nuryadi R
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.2805

Abstract

Pure and cerium oxide (CeO2)-doped zinc oxide (ZnO) rods have been successfully grown on glass substrates using hydrothermal method. Growth of ZnO nanorods has two main processes, i.e. deposition of seed layer and growth of rods. The concentration ratios of Ce/ZnO are of about 1%, 5%, and 10%. The effect of CeO2 dopan on the structural and morphology of ZnO nanorods were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersion X-ray (EDX), and Fourier transform infrared (FTIR). The XRD spektrum on pure and CeO2-doped ZnO rods have hexagonal wurtzite structure with three highest peaks on the lattice of (100), (002), and (101), and face-centered cubic CeO2 phase on the lattice of (111) and (200). Analysis result of SEM confirmed that pure and CeO2-doped ZnO rods formed agglomeration of hexagonal flower-like rods. The addition of CeO2 shifted ZnO peaks of FTIR spectrum from 729 cm-1 to ~780 cm-1 .

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