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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 7 Documents
 1 
Search results for , issue "Vol 19, No 2 (2022)" : 7 Documents clear
Modification of Natural Carbolic Acid from Arpus wit Lemongrass Essential oil as a Disinfectant wibiana wulan nandari; Faizah Hadi; Mitha Puspitasari; Susanti Rina Nugraheni; Titik Mahargiani
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.v0i0.6036

Abstract

Carbolic acid is a cleaning fluid or disinfectant that can be used to clean various kinds of surfaces, especially floors. Carbolic acid is used to prevent germs and viruses from growing so as to prevent disease and its spread. Most housewives often use chemical-based floor cleaners that are immediate or more practical. Long-term and too frequent use can be harmful to the body and the environment. Therefore, one solution to minimize this is to use natural ingredients that are already available and developed in Lubuklinggau City, such as lemongrass to be used as carbolic acid. The preparation begins by dissolving the arpus into the NaOH solution until it dissolves, then adding a mixture of pine oil, teepol and propylene glycol until everything is homogeneously mixed. Carbol is ready to use. The resulting product is carbolic floor disinfectant. Modified natural carbolic acid from arpus and lemongrass can be used as a disinfectant because based on the results of research that has been done it can kill E-coli bacteria and has a fairly high effectiveness with an inhibition zone of 19.2 mm.
Characteristics and Applications of Sea Water Reverse Osmosis Reject Water of PT Cirebon Electric Power as Voltaic Cell Electrolyte and Salt Raw Material Dimas Agung Pramudikto; Satya Nugroho; Agik Dwika Putra; Ilham Satria Raditya Putra; Sigit Setyawan; Teguh Ariyanto
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.v19i2.5361

Abstract

Sea Water Reverse Osmosis (SWRO) reject water produced by PT Cirebon Electric Power has not been optimally utilized. In this research, a study of the characteristics of SWRO reject water was carried out to determine important properties such as turbidity, conductivity, pH and salinity. This characteristic is important as a basis for consideration of SWRO reject water applications. In addition, data were taken from a fairly long period of 5 years of SWRO operation (2016-2021) so that the consistency of the data can be known. The results showed that SWRO reject water had low turbidity (0.18±0.08 NTU), high conductivity of ca. 76.000 µS/cm, neutral pH and high salinity (4.6±0.3%). The study of the utilization of SWRO reject water was then carried out, namely as an electrolyte for salt water lamps and as raw material for making salt. The results showed that SWRO reject water can be used as an electrolyte for salt water lamps which produces a voltage potential up to 1.4 Volts (20% higher than seawater electrolyte). As a raw material for salt, the salt produced has excellent characteristics (eg 99% NaCl) and complies with SNI 3556:2016, except for the KIO3 content.
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.
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.
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.
Mass Transfer Coefficient Extraction of Oleoresin from Zodia Leaf (Evodia suaveolens) with Ethanol Solvent Using Ultrasonic Cleaner Siswanti Siswanti; Ratri Saviatri; Jeremy Adi Pratama
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.v19i2.7286

Abstract

The Aedes sp mosquito is a vector of Dengue Hemorrhagic Fever (DHF) and chikungunya which are still commonly found in Indonesia. To control DHF, natural insecticides from plants can be used. Zodia plants (Evodia suaveolens) can be used as natural insecticides because they contain essential oils that mosquitoes do not like. To obtain oleoresin with optimal quality and quantity, extraction can be carried out using ultrasonic waves. To design an efficient extractor, mass transfer coefficient data is needed. Until now, the data is still difficult to obtain. The experiment was carried out using an ultrasonic cleaner, by observing the concentration of oleoresin for various leaf mass ratios of 4, 6, 8, 10, and 12 grams, extracted with 300 mL ethanol for 900 seconds. Concentration observations were also carried out for a time variation of 90 - 900 seconds, with 90 seconds intervals. The best extraction results were tested using GC-MS, to determine the components in the oleoresin. To determine the mass transfer coefficient (Kc) is to make a relationship between concentration and time for the best ratio of leaf weight and ethanol volume.Based on research that has been done with 300 mL of ethanol and extraction time of 900 seconds, the highest concentration was 0.0120 gr/mL, for the experiment using a leaf weight of 12 gr. The largest percentage (%) of oleoresin that could be extracted was 88.5%, for the experiment the leaf weight was 2 g. The optimum mass transfer coefficient (Kc) is 0.161088 1/minute. These data were obtained for the experiment of the relationship between concentration and time. Oleoresin from Zodia leaves contains 20.61% nerolidol. This compound has effectiveness as a mosquito repellent.
Acid Tar Waste Beneficiation Through Blending with Coal Downmore Musademba; David Jambgwa Simbi; Pardon Kusaziwa Kuipa
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.v19i2.6346

Abstract

The possibility of blending acid tar waste with coal as a beneficiation method was explored in this work. It was essential to first establish the material properties of the acid tar and coal samples together with that of the blends in terms of proximate analyses. The acid tar waste to coal blending ratios of 3:1, 1:1 and 1:3 were used. It was observed that acid tar waste exhibited high volatile and moisture content with low ash and carbon content when compared with coal. When compared with coal; a 3:1 blending ratio exhibited 56.9 % and 7.6 % reduction in ash and fixed carbon respectively and on the contrary a 38.1 % increase in volatile matter was observed. An opposite trend was obtained with 1:3 blend ratio. The 1:1 blend ratio was found to decrease the volatile and ash content by 8.3 % and 52.7 % respectively whilst fixed carbon boosted by 4.2 %. The choice for the blending ratio to apply is a trade-off between fixed carbon and volatile matter. If volatile matter is of any significance then a 3:1 mixture would be ideal; such a mixture will aid in easier ignition of coal.  On the other hand a 1:3 binary mixture yields a higher fixed carbon fraction, whose effect is to boost the calorific value of the fuel, an excellent factor for combustion. Overall however, it makes economic sense to blend coal with acid tar waste for enhancing sustainability.

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