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INDONESIA
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 301 Documents
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PENGARUH KONSENTRASI ABSORBEN (Fe-EDTA) TERHADAP PENURUNAN KANDUNGAN H2S DALAM BIOGAS PADA LAJU ALIR UDARA REGENERASI YANG BERBEDA Endang Kwartiningsih; Arif Jumari; Adrian Nur; Danu Nugroho; Umi Sarwanti; Slamet Sapto; Endah Ari
Eksergi Vol 9, No 1 (2008): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7553

Abstract

Bíogas is very potential to be used as fuel because of its high content of methane. Biogas had also been developed and used by several industries as alternative fuels to substitute mineral oil, The disadvantage of biogas as fuel was its high content of hydrogen sulfide which is potentíal to pollute the ervironment. Because of this, biogas should be purified first before being used as fuel. Generally, the content of H2S can bereduced physically, chemically or biologically methods, but these methods have many disadvantages. Biogas purílìcation(also other gases) from the content of H2S using Fe-EDTA(Iron Chelated Solution) gave several advantages. The advantages were the absorbent solution can be regenerated that means a cheap operation cost, the separated sulfur was asolid (that is an economic commodity) or resídue that is easy to handle and is save to be disposal to environment. Iron Chelated Solutionwas made by solving the substance of salted iron to EDTA solution. The salt of FeCl2, was made by solving iron waste obtained from lathe machine to hydrochloric acid solution. The research of reduction of the content of H2S in biogas was conducted by contacting Fe-EDTA solution with biogas in an absorber column of 1 m height and 0. I m diameter The rich H2S solution from absorber was then flowed to the separator column to separate the solid of sulfur and its solution. The solution from separator column was then regenerated by oxidation in regenerator column. In regenerator column solution which is rich of iron reacted with oxygen from air to be Fe3. . The solution which is rich of Fe was then used again to absorb H2S in biogas. Biogas used during experiment was obtained from PT Indo Acidatama Tbk. The content of H2S in raw biogas was 2.8235 %. The result of the research showed that the concentration of absorbent influenced the reduction of the content of H2S. Absorbent solution with concentration of 0.2 M of Fe-EDTA was able to absorb 99 % of all H2S from 2.8235 % to 0.02 % in a column of I m height and 0.1 m diameter Absorbent solution with concentratíon of 0.1 M of Fe-EDTA was only able to absorb 59% of all H2S from 2.8235% to 1.2 %. The regeneration air flow rate also influence the reduction of the content of H2S in biogas. The higher the regeneration airflow rate the higher the reduction of the content of H2S.
Penggunaan Chlorella sp. sebagai Alternatif untuk Mengolah Limbah Cair Industri Pengolahan Susu Yuli Pratiwi
Eksergi Vol 9, No 1 (2008): Terbitan lama
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7547

Abstract

One of methods of treating waste in the most efective and chepest way is by biological method because it utilize mícrobes that are abundant in natural etwironment. Microbe actívities can be utilízed to produce a system that can accomplish recycling process, so they can control the quality of waste. This research is aimed to carry out test by utilizing microbes Chlorella sp. that is belonged to phytoplanktons that are used as innoculum for treating waste miIk industry. The research was conducted at the Environmental Technical Laborotory of ISTA Yogtøkortarta for 3 months, wíth activities starting from Chlorella sp. culturing, preliminary research for determining the concentration of optimal inocallum growth to the main research, the application of Chlorella sp. for milk waste treatment. From the result of research, it was evident that milkwaste milk Índustry exerted positive influence on the growth of Chlorella sp. that could reached optimal rate. The optimal growth rate, in turn, could be utilized to improve milkwaste quality, especially to reduce BOD, soluble CO, and to íncrease DO as well as to neutralize pH. Other efect of optimal Chlorellasp. growth was that protozoa populatíon growth that sustain and acceleratethe treatment of this milkwaste.
Utilization of Nanochitosan as Adsorbent of Mercury (Hg) in Gold Ore Processing Waste Nadhifa Aliyya Himawan; Handoko Darmokoesoemo; Totok Ardiarto; A. Budi Prasetya; Badrud Tamam Ibnu Ali
Eksergi Vol 19, No 2 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i2.6862

Abstract

Mercury pollution in gold ore processing wastewater can cause environmental and health problems. A large amount of mercury pollution causes neurological disease, paralysis, loss of sense of taste, irregular speech, and death. One effective method to reduce mercury amount in the environment is adsorption. Adsorption performance is affected by several factors such as surface area of material, deacetylation degree (DD), and adsorption condition, which is indicated by contact time and mercury concentration. Nanochitosan is used in this research. Effect of deacetylation degree (85%; 87%; 95%), contact time (30;60;90;120 minutes), and variation of mercury concentration (5;10;15;20;25;30 ppm) on adsorption performance was investigated in this research. Nanochitosan in this research is characterized by FTIR, SEM-EDX, BET-BJH, and pH PZC. AAS measures adsorption performance in this research. The result shows that nanochitosan, which has the best adsorption performance, is nanochitosan with a deacetylation degree of 95%, at a contact time of 60 minutes, and mercury concentration is 15 ppm.
Verification of the Walkley Black Method Test for Determination of Organic Carbon Elements in Palm Oil Empty Fruit Bunch Waste Fertilizer Wakhid Khoirul Umar; Fandika Agustiyar; Aulia Rahma
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.7267

Abstract

Verification of the organic carbon method on organic fertilizer from Palm Oil Empty Fruit Bunches (TKKS) waste using a UV-Vis Spectrophotometer has been carried out. The determination of this OPEFB fertilizer refers to the AOAC (2000) with the Walkley Black method. The results of the organic carbon test on OPEFB fertilizer show the correlation coefficient (r) value obtained is 1.0000, and the % relative standard deviation (RSD) value of 0.4022% means that the value is below 2/3 CV Horwitz of 4.7230. accuracy with a value of 106.99%. The method limit value (LOD) is 2.4531, and the quantization limit value (LOQ) is 8.1769. The instrument limit value (LOD) is 2.4990, and the quantification limit value (LOQ) is 8.3299; the test results indicate that it has complied with the conditions with acceptance. The test results for determining organic carbon in OPEFB fertilizer using the Walkley Black method with UV-Vis Spectrophotometer showed valid results, so the method could be used.
Isotherm and Adsorption Thermodynamics Cross-Linked Chitosan Microcapsules of Kalium Pershulphate to Methyl Orange Dye Endang Sulistyawati; Heni Anggorowati; Nadia Rochmah K.P; Navyta Ariardini
Eksergi Vol 19, No 2 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i2.6163

Abstract

Modeling of isotherm and adsorption thermodynamics in this study, leads to the determination of the classification of adsorption isotherms and the determination of the amount of energy and entropy to determine the impeccability of the process. As an adsorbent, a potassium persulfate crosslinked chitosan microcapsule was synthesized through a microencaptulation process using a solvent evaporation method with a carboxy methyl cellulose CMC coating. The characteristics of the chitosan microcapsules that were formed had a degree of deacetylation of 53,92 %, and a bn mutant diameter around 1-100 µm. Test materials used azo methyl orange dyes, which are often found in industrial waste and laboratory waste. Observations were made with variations in the concentration of methyl orange solution 5, 7,5, 10, 12,5, 15, 17,5 and 20 ppm at temperatures of 30, 40 and 50 ° C. The calculation results show that the adsorption isotherm model obtained approaches the Langmuir isotherm model. The results of the analysis of temperature effects obtained positive Gibbs energy change values (ΔG) so that the adsorption process takes place non-spontaneously. The values of  enthalpy change (ΔH) and entropy change (ΔS) of 33,86 kJ / mol and 0,0899 kJ / mol.K.  This indicates that adsorption occurs chemically adsorption, is endothermic and adsorbat is not completely adsorbed.
KOEFISIEN PERPINDAHAN PANAS KONVEKSI PADA PEMISAHAN FRAKSI RINGAN MINYAK PELUMAS BEKAS Tunjung Wahyu Widayati; Zubaidi Achmad
Eksergi Vol 9, No 1 (2008): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7554

Abstract

Lubricant oil has límited time in its using. After ín that time, the oìl has been not aplicated so ít hasto be substìtuted with the another one. By forward wíth transportation, there wìll be pollution in environment. Inholding that problems, so the renewable processing used lubrícant oil is needed to be more ecommíc product. The process was done ín the separating equipment that was being heated 200-250"C wíth some pnæess ptameters.The parameters were 0.061 -0.0389 m/sec in flow rate, 170-230 degree C in the feeding temperature, 0.11 - 0.07 m in ã diameter of separation equipment, 77 -95.5'C in the diference temperature wíth in oíl and equipment wall. The feed from feed tank was flowed by pass heater and than its in to separation equipment. The product was dístilate, were analyzed in physic characterìzatíon í.e., specific gravity, viscosity, colour ASTM and flash point. The rafinate þottom product, heavy fractÍon, was put ín to feeding tank. The rafinøt was analyzed fisic characterization i.e., specítìc gratity, flash point, fire poínt¡ kinematic, viscosíty and viscosity índex. The rafinate analysis was done after the process was stopped.
Pengaruh Aktivasi Bentonit Wonosegoro terhadap Perbaikan Sifat Fisis Minyak Pelumas Bekas Industri Gogot Haryono
Eksergi Vol 9, No 1 (2008): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7548

Abstract

Bentonit is a kind of ore which has a high adsorption power due to its hígh content of montmorilonit. Its wìdely used in many applications as well as an activated carbon. In fact, activated bentonit can improve physical properties of used lubrícant oil partially its Rëdwood vìscocity, flash point and carbon residue. In this research, the activation procceses including heating, pressurizing and acíd methods. Such methods were conducted ìn a muffle burner (at temperature of 280, 300, 320, 340, 360 and 38 degree C, ín a pressure vessel (at pressures of 1.75; 2.23; 2.54; 2,66; and 3.02 atm), and three neck bottles (at acid concentrations of 0.1; 0.2; 0.3; 0.4 and 0.5 N), respectìvely. The activated bentonit was thereafter tested to absorp a quantity of sample used lubricant oil. From these experiments, it was concluded that activated bentonit can increase the Redwood viscocity and flash poínt of used lubrícant oil and also decrease its carbon residue. The optimum temperature, pressure and acidconcentratíon obtainedwere 36tC, 2.66 atm and 0.4 N, respectively. At this condition, the used lubricant oil had a Redwood víscocity 125.9 cP, flash point of 112 degree C and carbon residue of 22.05%.
Pengaruh Variasi Waktu Kontak dan Dosis Adsorben Fly ash teraktivasi NaOH terhadap Adsorpsi Metilen Biru Brilian Gema Morentera; Sri Wahyuningsih; Dyan Hatining Ayu Sudarni
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.7207

Abstract

A rapid growth of  textile industry creates a new problems  on environment, one of those is the presence of dye waste. Methylene blue is one of the dyes which is toxic to living things, one of those triggers cyanosis for human and bother photosyntesis  of algae. Therefore, it needs the effort to reduce, one of those is by adsorption. This study aims to determined the effect of dosage adsorbent variation and contact time variation to adsorb methylene blue. Adsorption is an adsorbate molecule absorption process that occurs on the surface of the adsorbent. This study used fly ash from PG. Pagottan and has been activated by NaOH. Measure method of this study using UV-Vis Spectrophotometry to measure concentration of methylene blue at maximum wavelenght. Based on data, NaOH-activated fly ash and non-activated fly ash  following Langmuir isotherm adsorption, it mean a monolayer site is formed. Adsorption capacity also increase after activation, it about 21,74 mg/g to 23, 25 mg/g. Based on the study fly ash has a potential as a new adsorbent. 
Simulasi Siktus Refrijerasi Satu, Dua, dan Tiga Tahap dengan HYSYS 3.2. Aditya Putranto
Eksergi Vol 9, No 1 (2008): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7542

Abstract

Penggunøan sikus refriijerasi semakin meningkat dalam industri kimia untuk penyediaan chilled water. Pada makalah ini disimulasikan siklus refrijerasi satu tahap, dua tahap, dan tiga tahap dengøn HYSYS 3.2. Beberapa data dimasukkan agar tercapai derajat kebebasan (degree of freedom) sama dengan 0. Neraca massa dm energi terhìtung dengan bantuan sortware HYSYS 3.2. dan diamati profìl beban kondensor, kompresor, dan evaporator terhadap berbagai variable yang berpengaruh. Berdasarkan hasil simulasì, beban kondensor, evaporator dan kompresor dipengaruhi oleh tekanan kondensoi tekanan evaporstoti dan tekanan interstage.
Comparison of the Use of NaOH and KOH Activators in the Manufacture of Activated Carbon from Cassava Peel (Manihot utilissima) Mitha Puspitasari; Wibiana Wulan Nandari; Faizah Hadi
Eksergi Vol 19, No 2 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i2.7245

Abstract

Cassava (Manihot utilissima) is a staple food beside rice and corn for Indonesia people. Cassava peel is a waste of cassava processing agroindustries such as  tapioca flour industry, fermentation industry, and staple food industry. This waste contains a fairly high carbon element of 59,31%. Cassava peel has the potential to be used as raw material for activated carbon because of its high carbon content. Activated carbon production involved some steps such as preparing raw materials, carbonization, activation, neutralization, and analysis of water content, ash, iodine number, and analysis of the pore surface area of activated carbon. Activated carbon was activated using NaOH and KOH with concentrations of 0.1; 0,2; 0,3; 0,4; and 0,5N. The results showed that activated carbon which activated with 0,4N NaOH and 0,5N KOH provided the closest parameter with SNI 06-3730-1995 standard. The use of NaOH activator can increase the surface area of activated carbon compared to KOH activator.

Page 13 of 31 | Total Record : 301

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