Jurnal Rekayasa Proses
Jurnal Rekayasa Proses is an open-access journal published by Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada as scientific journal to accommodate current topics related to chemical and biochemical process exploration and optimization which covers multi scale analysis from micro to macro and full plant size. Specialization topics covered by Jurnal Rekayasa Proses are: 1. Kinetics and Catalysis Includes simulations and experiments in reaction kinetics, catalyst synthesis and characterization, reactor design, process intensification, microreactor, multiphase reactors, multiscale phenomena, transfer phenomena in multiphase reactors. 2. Separation and Purification System Includes phase equilibrium, mass transfer, mixing and segregation, unit operation, distillation, absorption, extraction, membrane separation, adsorption, ion exchange, chromatography, crystallization and precipitation, supercritical fluids, bioprocess product purification. 3. Process System Engineering Includes simulation, analysis, optimization, and process control on chemical/biochemical processes based on mathematical modeling; multiscale modeling strategy (molecular level, phase level, unit level, and inter-unit integration); design of experiment (DoE); current methods on simulation for model parameter determination. 4. Oil, Gas, and Coal Technology Includes chemical engineering application on process optimization to achieve utmost efficiency in energy usage, natural gas purification, fractionation recovery, CO2 capture, coal liquefaction, enhanced oil recovery and current technology to deal with scarcity in fossil fuels and its environmental impacts. 5. Particle Technology Includes application of chemical engineering concepts on particulate system, which covers phenomenological study on nucleation, particle growth, breakage, and aggregation, particle population dynamic model, particulate fluid dynamic in chemical processes, characterization and engineering of particulate system. 6. Mineral Process Engineering Includes application of chemical engineering concepts in mineral ore processing, liberation techniques and purification, pyrometallurgy, hydrometallurgy, and energy efficiency in mineral processing industries. 7. Material and biomaterial Includes application of chemical engineering concepts in material synthesis, characterization, design and scale up of nano material synthesis, multiphase phenomena, material modifications (thin film, porous materials etc), contemporary synthesis techniques (such as chemical vapor deposition, hydrothermal synthesis, colloidal synthesis, nucleation mechanism and growth, nano particle dispersion stability, etc.). 8. Bioresource and Biomass Engineering Includes natural product processing to create higher economic value through purification and conversion techniques (such as natural dye, herbal supplements, dietary fibers, edible oils, etc), energy generation from biomass, life cycle and economic analysis on bioresource utilization. 9. Biochemistry and Bioprocess Engineering Includes biochemical reaction engineering, bioprocess optimization which includes microorganism selection and maintenance, bioprocess application for waste treatment, bioreactor modeling and optimization, downstream processing. 10. Biomedical Engineering Includes enhancement of cellular productions of enzymes, protein engineering, tissue engineering, materials for implants, and new materials to improve drug delivery system. 11. Energy, Water, Environment, and Sustainability Includes energy balances/audits in industries, energy conversion systems, energy storage and distribution system, water quality, water treatment, water quality analysis, green processes, waste minimization, environment remediation, and environment protection efforts (organic fertilizer production and application, biopesticides, etc.).
Articles
273 Documents
<![CDATA[Kombinasi adsorben biji kelor - zeolit alam Lampung untuk meningkatkan efektivitas penjerapan logam Pb dalam air secara kontinu pada kolom fixed bed adsorber ]]>
<![CDATA[Simparmin Br. Ginting]]>;
<![CDATA[Sebastian Djoni Syukur]]>;
<![CDATA[Yeni Yulia]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 1 (2017): Volume 11, Number 1, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.23154
<![CDATA[The mixture of adsorbents of moringa seed (BK) and natural zeolite of Lampung (ZAL) is placed in a fixed bed adsorber column arranged at a certain height according to the designed height ratio. BK is processed by extraction to remove its oil content while ZAL is activated by chemical and physical treatments. Composition ratio of BK-ZAL (cm/cm) was varied i.e.1:1, 1:2 and 1:3 and concentrations of Pb entering adsorber were 1 ppm and 2 ppm. The adsorption conditions were 20-35 mesh adsorbent size, 4 cm diameter column of adsorber, 5 cm bed height, and 8 liters/3 hours flowrate. Upflow adsorption was performed in a fixed bed adsorption column for 3 hours and Pb solution of output adsorber was taken at every 30 minutes. Analysis of Pb content was performed by Atomic Absorption Spectroscopy (AAS). Adsorbent BK before and after extracted, and after adsorption were characterized using Fourier Transmission Infra Red (FTIR). ZAL before and after activation were characterized using X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), and Fourier Transmission Infra Red (FTIR). The characterization results of XRD, XRF and FTIR showed that the crystalline phases of ZAL increased, the activation process of ZAL only caused a shift in the peak, no significant change in the structure of solids, and the content of impurities in ZAL reduced after activation, thereby enhancing its ability to adsorb Pb. AAS analysis results showed that the best combination adsorbent BK-ZAL (cm/cm) was 1: 2 with the highest effectiveness of the entrapment of Pb metal reached 99.90%. The adsorption capacity of adsorbent was 2.25 mg Pb/ gram adsorbent calculated using Freundlich equilibrium model.]]>
<![CDATA[Pengaruh organic loading rate pada produksi biohidrogen dari sampah buah melon (Cucumis melo L.) menggunakan reaktor alir pipa ]]>
<![CDATA[Nurkholis Nurkholis]]>;
<![CDATA[Sarto Sarto]]>;
<![CDATA[Muslikhin Hidayat]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 1 (2017): Volume 11, Number 1, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.23057
<![CDATA[The energy crisis and adverse effects from the use of fossil fuels requires the development of energy sources that are non-polluting and renewable, such as bio-H2. Bio-H2 can be produced from organic biomass such as melon fruit waste, because it is available in large quantities and has adequate content of organic fraction. Production of bio-H2 from melon fruit waste done by dark fermentation on the pipe flow reactor consisting of microorganisms acclimatization phase and continuous substrate feeding phase with variation of organic loading rate (OLR) are 6.0443 kg VS/ m3.day (OLR1), 7.6217 kg VS/ m3.day (OLR2) and 26.3152 kg VS/ m3.day (OLR3). Gas and liquid samples taken from the reactor for analysis of H2 concentration, volatile solid (VS) and volatile fatty acid (VFA) The results of the study showed that the production of bio-H2 optimal amounted to 90.8904 mL/ g VS on variations OLR3 is 26.3152 kg VS/ m3.day with substrate degradation efficiency reached 45.39%. The concentration of organic acids produced ranges from 400-800 mg/ L and acetic acid as the dominant product with an average concentration of 442.9276 mg/ L.]]>
<![CDATA[Pengaruh penambahan EM-4 dan molasses terhadap proses composting campuran daun angsana (Pterocarpus indicun) dan akasia (Acasia auriculiformis) ]]>
<![CDATA[Ahmad Pinandita M.K]]>;
<![CDATA[Dery Biyantoro]]>;
<![CDATA[Margono Margono]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 1 (2017): Volume 11, Number 1, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.19145
<![CDATA[Dried leaves in the Universitas Sebelas Maret (UNS) area, which consist of angsana (Pterocarpus indicus) and acacia (Acacia auriculiformis) are potential to be utilized as organic fertilizers. The objective of this research was to study the influence the addition of inoculation with Effective Microorganism-4 (EM-4) and molasses in composting process of angsana and acacia leaves. As much as 3 kilograms of acacia and angsana leaves crushed till 1 cm size was incorporated into fermentor tank. Into the reactor, EM-4 and molases were then added and the fermentor was sealed. This mixture was incubated for 4 weeks, and every 4 days it was homogenized by flipping the fermentor tank. Sampling was carried out every 7 days for total organic C and total N content measurements and C/N ratio calculation. The volume ratio of EM-4 inoculation and molasses addition was varied i.e. 3:3, 9:3, 3:9, and 9:9. The fastest maturity of organic fertilizer during the composting process was achieved by EM-4: molasses ratio of 3:9 which only needed 21 days composting time. All other ratios have reached maturity on the 28th day of composting process. The variation of EM-4 has an effect on the time of organic fertilizer maturity product, while the variation of molasses has no effect on the process.]]>
<![CDATA[Pengaruh rasio doxorubisin: Apoferritin terhadap kapasitas dan efisiensi enkapsulasi doksorubisin dalam apoferritin ]]>
<![CDATA[Novita Wiwoho]]>;
<![CDATA[Maria Christina P.]]>;
<![CDATA[Mujamilah]]>;
<![CDATA[Grace Tj. Sulungbudi]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 1 (2017): Volume 11, Number 1, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.24868
<![CDATA[Doxorubicin is a chemotherapy drug which is very toxic and causes many side effects. To reduce side effects, doxorubicin can be encapsulated by apoferritin into apoferritin doxorubicin (Apo-Dox) system. In this research, various mass of doxorubicin i.e. 0.17 mg (S1), 0.26 mg (S2), 0.35 mg (S3), and 0.52 mg (S4) were encapsulated with 21.50 mg apoferritin. Encapsulation process was carried out by lowering pH medium for apoferritin dis-assembly, doxorubicin addition and dialysis for gradual and controlled pH-increase of medium to support re-assembly of apoferritin and doxorubicin encapsulation. End-result samples were then centrifuged and washed to separate the unreacted doxorubicin and apoferritin’s subunits. Doxorubicin encapsulation efficiency was determined using microplate reader spectrophotometry. The highest encapsulation capasity was 3.87 g dox/mg apo for S4 samples. Increasing the weight of doxorubicin gives more significant effect on increasing the reactive weight of apoferritin, which reached 93.73% (S4 sample). Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis (SDS-PAGE) analysis confirm that apoferritin is in the Apo-Dox sample.]]>
<![CDATA[Uji validitas model shrinking core terhadap pengaruh konsentrasi asam sitrat dalam proses leaching nikel laterit ]]>
<![CDATA[Kevin Cleary Wanta]]>;
<![CDATA[Himawan T. B. M. Petrus]]>;
<![CDATA[Indra Perdana]]>;
<![CDATA[Widi Astuti]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 1 (2017): Volume 11, Number 1, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.23321
<![CDATA[Atmospheric pressure acid leaching process is one of nickel laterite processing which has a big potential to be applied in industry. The leaching process is influenced by several factors and one of them is concentration of acid as leachant. The purpose of this present study is to learn the effect of concentration of citric acid on the use of shrinking core kinetic model. The process was done by varying citric acid concentration at 0.1, 1, and 2 M. The other operation conditions, such as particle size, solid-liquid ratio, temperature, stirring speed, and leaching process were kept constant at 125-150 μm, 0,2 sample mass/volume of acid solution, 85 oC, 200 rpm, and 120 minutes, respectively. The experimental results showed that the higher concentration of citric acid was used, the higher the percentage recovery of nickel was obtained. In addition, the validity test of shrinking core model indicated a positive impact to describe physical phenomenon of leaching process.]]>
<![CDATA[Pengaruh penambahan zeolit alam termodifikasi sebagai media imobilisasi bakteri terhadap dekompisisi material organik secara anaerob ]]>
<![CDATA[Melly Mellyanawaty]]>;
<![CDATA[Chandra Wahyu Purnomo]]>;
<![CDATA[Wiratni Budhijanto]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 1 (2017): Volume 11, Number 1, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.26353
<![CDATA[This study aims to determine the effect of modified natural zeolite as microbial immobilization medium for anaerobic decomposition of organic materials. The modification was Fe2+ impregnation into the ring-shaped zeolite. Three different concentrations of Fe2+ solution were used to impregnate the zeolite, i.e. 10 mg/L, 100 mg/L and 2000 mg/L. The wet impregnation process was conducted. Four variations of Fe2+ concentration deposited into zeolite were prepared, i.e. 0 mgFe2+/gZeo (as control), 0.0016 mgFe2+/gZeo, 0.0156 mgFe2+/gZeo and 0.3125 mgFe2+/gZeo. The modified zeolite was added to the batch anaerobic reactor, which filled with the volume ratio of liquid substrate and zeolite of 1:1 for all variations of media. Distillery spent wash was used as the substrate in this study. The soluble Chemical Oxygen Demand (sCOD) value of the substrate was homogenized at 10000 mg/L. Effluent digester of cow manure bio digester was added as inoculum. The volume ratio of distillery spent wash to the inoculum was 2:1. The anaerobic process was conducted for 28 days.The performance of four media in the anaerobic digestion of distillation spent wash was measured in terms of sCOD, total solid (TS), and volatile solid (VS). The comparison among media was more accurately and conclusively represented by sCOD value. The visual analysis of sCOD trend during 28 days indicated that zeolite with 0.0156 mgFe/gZeo resulted in the highest sCOD removal of 66.73%. Meanwhile, zeolite with 0.3125 mgFe/gZeo increased the production of biogas by the highest percentage of 43% to be compared to control. Generally speaking, the addition of Fe2+ into zeolit led to higher removal of sCOD and produced more biogas than control.]]>
<![CDATA[Kinetika pelarutan silika amorf dari lumpur panas bumi Dieng ]]>
<![CDATA[Nurdin Riyanto]]>;
<![CDATA[P. Sumardi]]>;
<![CDATA[Indra Perdana]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 6 No 1 (2012): Volume 6, Number 1, 2012 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.2450
<![CDATA[Dieng’s geothermal power plant generates not only energy but also wastes as sludge that contains around 50% silica in an amorphous state. The waste has a great potential to be used as a source of micro-amorphous silica synthesis to fulfill industrial needs. This research aimed to study the dissolution kinetics of amorphous silica. In the present work, the alkali – solubilization process by means of the dissolution of amorphous silica in an agitated flask was studied by varying process temperatures (50 – 90 °C), stirring speed (150 – 450 rpm), Na/Si molar ratio (2 – 3), and silica particle size (0,0069 – 0,01975 cm). Experimental results showed that the rate of geothermal silica dissolution increased with temperature and stirring speed. Meanwhile, Na/Si molar ratios and silica particle sizes showed no significant influence on the dissolution process. Calculation results indicated that the dissolution process involved a solid – liquid reaction that occured at the solid surface.]]>
<![CDATA[Kajian awal laju reaksi fotosintesis untuk penyerapan gas CO2 menggunakan mikroalga Tetraselmis chuii ]]>
<![CDATA[Elida Purba]]>;
<![CDATA[Ade Citra Khairunisa]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 6 No 1 (2012): Volume 6, Number 1, 2012 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.2451
<![CDATA[The background of the present study was the facts that the increase of carbon dioxides concentration in the air due to industrial activities and fossil fuel combustion certainly leads to global warming. In order to reduce carbon dioxides concentration, photosynthesis reaction using Tetraselmis chuii was one of the potential methods to use. The present study aimed at determining the rate constant of reaction that used Tetraselmis chuii. The study was carried out by firstly saturating sea water as a culture media with carbon dioxide in order to reduce the influence of carbon dioxide diffusion through the media. Microalgae were then put inside the photo-bioreactor at different operating conditions. The operating variables investigated in the present work were temperature (28C, 30C and 35C) and inlet CO2 gas concentration (4, 9 and 14%) with a complete random experimental design. Experimental results showed that the highest absorption capacity was achieved at 30C and 35C for each inlet CO2 concentration. However, the order of reaction with respect to CO2 concentration could not have been determined since the correction factors (R) values obtained from graphical analysis of first, second and third order reactions were not significantly different.]]>
<![CDATA[Degradasi substrat volatile solid pada produksi biogas dari limbah pembuatan tahu dan kotoran sapi ]]>
<![CDATA[Budi Nining Widarti]]>;
<![CDATA[Siti Syamsiah]]>;
<![CDATA[Panut Mulyono]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 6 No 1 (2012): Volume 6, Number 1, 2012 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.2452
<![CDATA[Waste from tofu production and cow dung are potential organic materials for biogas production based on the content of volatile solid. This study aims to determine the optimal content of volatile solid in a mixture of tofu production waste-cow dung and to obtain the kinetic parameters of the degradation of volatile solid to form biogas. A mixture at certain composition is put into digester. To obtain anaerobic condition, N2 gas is flown into the digester, and then the digester is sealed. The mixture is incubated in a water bath at a temperature of 35oC for 56 days. Biogas volume and pH are measured every day. Methane, volatile fatty acids and volatile solid are analyzed every 7 days. Carbohydrates, proteins and fats in the slurry are analyzed three times during the production of biogas. The results showed that digester with 12% volatile solid produces the highest biogas yield of 89.522 mL/g volatile solid, with the highest methane concentration 14.68%. Kinetics model of degradation of volatile solid can be approached by a first order reaction model.]]>
<![CDATA[Studi proses pembuatan biodiesel dari minyak kelapa (coconut oil) dengan bantuan gelombang ultrasonic ]]>
<![CDATA[Sri Kembaryanti Putri]]>;
<![CDATA[Supranto Supranto]]>;
<![CDATA[Rahman Sudiyo]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 6 No 1 (2012): Volume 6, Number 1, 2012 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.2453
<![CDATA[Biodiesel is produced by methanolysis of various vegetable oils such as coconut oil, palm oil, seed oil, soybean oil, etc. Coconut oil has the potential as a raw material for making biodiesel due its abundant availability. The use of the ultrasonic waves can increase conversion and reaction rate. The objective of this study was to study the effect of the use of ultrasonic waves on the transesterification of coconut oil, the ratio of reactants, catalyst concentration, and activation of methanol on the reaction conversion. Sodium hydroxide catalyst with a specific weight was dissolved in methanol with a certain volume. After dissolvtion was completed, the reactants including coconut oil with a certain volume were put into the reactor, and reaction was then started. Samples were taken every 10 minute intervals for analysis of fatty acids. The reaction was stopped after 60 minutes. Furthermore, biodiesel was separated from glycerol and purified. Experimental results showed that transesterification of coconut oil could be improved with the help of ultrasonic waves. The obtained conversion was 4 times higher (85,66%) than the conversions generated in the conventional process (20,15%) The process was done in the same condition which was the ratio of reactants of 5 mgek methanol / mgek oil, catalyst 1% by weight oil and the initial reaction temperature of 60C. The greater the ratio of methanol-oil equivalent, the higher reaction conversion is.]]>
