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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 301 Documents
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PENGGUNAAN SERBUK ARANG AKTIF BIJI KELOR UNTUK MENURUNKAN KADAR NITRIT DALAM AIR Ana Hidayati Mukaromah; Rusda Abja; Fandhi Adi Wardoyo
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3291

Abstract

Nitrite (NO2 - ) is a compound that can distrupting oxyhaemoglobin process and causes body weakness, fatigue, and samnolen. Either to reduce nitrite value in the water is to use activated charcoal moringa seeds, because it countains 4-alfa-L-rhamnosyloxy-benzilisothiocyanate substances. This research aims to find out influence of activated charcoal concentrate and immersion time variant to the reduction of nitrites ion in the water. Research object was nitrite ion in 10 ppm concentrate, the immersion with activated charcoal moringa seeds with concentrate variant 9 ; 12 ; and 15%w/v, with 10 ; 20 ; and 30 minutes immersion time. Nitrite assay performed with specfotometry methods with griess reagent. From the research results, optimum wave length is 540 nm and time stability of initial nitrite value 10 minutes with initial 4,7794 ppm. Reduction lowest nitrite value in the water is 9%w/v concentrate in 10 minutes time, with the result 3,1816 ppm and highest nitrite value is 15%w/v concentrate (1,1862 ppm). So that, can be conclude there is reaction activated charcoal moringa seeds variant concentration and immersion time to reducting nitrite ions in the water.
Pengaruh Penambahan Antioksidan Simplisia Kunyit Terhadap Angka Peroksida Minyak Kacang Tanah Yuniarti Dewi Rahmawati
Eksergi Vol 18, No 2 (2021)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v0i0.4565

Abstract

Peanut oil is a peanut product that is used for the food industry. The high content of fatty acids in the form of oleic acid causes peanut oil to break down easily, so it is necessary to add antioxidants to inhibit the oxidation process.The natural antioxidant used is turmeric. The purpose of this study was to determine the effect of the addition of turmeric antioxidants on the peroxide rate of peanut oil. The research method for calculating the peroxide number uses iodometric titration. The results showed that the greater the concentration of turmeric simplicia added to peanut oil, the greater the antioxidant activity. The greatest antioxidant activity was obtained from the weight of simplicia 0.4 g with a long immersion period of 7 days, which resulted in a peanut oil peroxide value of 14.5 ml N / gr.
Identifikasi Keberadaan Air pada Proses Penyaluran Fluida Produksi di Lapangan Minyak Lepas Pantai Hariyadi Hariyadi; Dedy Kristanto; Yulius Deddy Hermawan
Eksergi Vol 17, No 2 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i2.3718

Abstract

Oil production that flows from the Platform to the FSO (Floating Storage and Offloading) "A" is derived from PT. "B" and the "C" Oil Company in the Madura Strait. The total oil production flowing from the Platform to the "A" FSO is currently around 6000 BOPD. As a result of the delivery system using the same channel, a problem arises, namely oil losses between the Platform as a delivery point and FSO "A" as a receiving point. Besides that, the water that is involved in the oil distribution process will be a deduction factor that will be used as a correction for oil shipments, the more water the less amount of oil will be received at FSO "A". The oil samples that have been taken are then observed for their characteristics, namely density, composition (%-mole), BS&W, emulsion, flash, shrinkage at PPPTMGB "Lemigas" Laboratory Jakarta. The specific gravity of samples is around 1,018. While the characteristics of the two are different from the characteristics of sea water; this difference is shown by the results of SG (1,018 vs 1,025) and the salt content of sea water is much higher than the water formation of PT "B" and PT "C". The oil samples of PT "B" and PT "C" have almost the same SG, which is 0.79. BS&W oil in both ships is quite low; this shows that the separation of oil and water on the Platform went quite well. However, BS&W samples in incoming FSO "A" are very high, at 5%; this indicates an off-set at the water-oil interface level settling time on the Platform separator so that water can be joined with the oil flow from the Platform to the FSO "A"
INVENTARISASI EMISI GAS RUMAH KACA SEKTOR LIMBAH DENGAN FIRST ORDER DECAY DI KABUPATEN KARANGASEM Affan Irfan Fauziawan
Eksergi Vol 18, No 1 (2021)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v0i0.4534

Abstract

Waste production increases with the increase in population, urbanization rate and people's income. Garbage is a contributor to greenhouse gas (GHG) emissions which can cause global warming. The Indonesian government is still committed to reducing greenhouse gas emissions and working to reduce / limit the increase in temperature below 1.50C. Karangasem Regency, is on the island of Bali, with a population in 2018 of 414,800 people. The population is spread across 8 sub-districts with the population growth rate in Karangasem averaging 0.88% per year. The distribution of the population will be directly proportional to the distribution of solid waste produced. It is important to do an inventory of GHG emissions to determine the amount of emissions in Karangasem Regency. The method for calculating municipal solid waste will be carried out using the First Order Decay method contained in the IPCC (Intergovernmental Panel on Climate Change) Guidelines. From the calculation results, GHG emissions have been obtained in each sub-district in Karangasem Regency. Total GHG emissions in 2019 amounted to 11,764 tons CO2-e, with the highest GHG emission contributor, namely Karangasem District with 2,302 tons CO2-e and the lowest being Sidemen District with 894 tons CO2-e. With this research, it is hoped that stakeholders will be able to make efforts (mitigation) that can reduce these GHG emissions.
Penurunan Konsentrasi Anion Fosfat dan Sulfat dalam Air Limbah Hasil Proses Pengolahan Senotim dengan Metode Elektrokoagulasi Kharistya Rozana; Devi Swasti Prabasiwi; Dewi Puspa Ariany
Eksergi Vol 17, No 2 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i2.3703

Abstract

Indonesia has rare earth mineral resources that have the potential to be processed into beneficial products for human life. In the processing of rare earth mineral resources rarely needed waste treatment devices to reduce contaminants in liquid waste process results. The method of processing with the electrocoagulator system is used because its does not require high levels of technology and costs. In research conducted wastewater treatment process results of xenotime by using method of electrocoagulation with variation of voltage and time of contact. Digestion of xenotime sand using concentrated sulfuric acid and in the content of xenotime sand there is a phosphate anion that binds with metal Y, Dy, Gd, La, Ce, Nd. Xenotime wastewater treatment process with electrocoagulation method is set at voltage variation 7V-13V with variation time of 0-120 minutes. The results of analysis with High Performance Liquid Chromatography (HPLC) showed that there is a decrease in the concentration of phosphate and sulfate anions in the filtrate of the processing results of xenotime wastewater using electrocoagulation method. The lowest concentrations of phosphate and sulfate anions occur in the 13 V voltage condition with 120 minutes of 1.180% and 0.564%.
Penggunaan Sekresi Kutu Lak pada Pembuatan Biokomposit dari Sabut Kelapa Hermawan, Axel Adam; Ariesta, Axl; Ilcham, Adi; Murni, Sri Wahyu
Eksergi Vol 18, No 2 (2021)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v0i0.4566

Abstract

Nowadays, biocomposite materials are required for particular needs. Coconut husk has a potential to be biocomposite using a resin produced by the laccifer lacca kerr (kerria lacca), an insect. This work was aimed to study the use of the lacca kerr resin to produce a biocomposite of coconut coir based. In the experimental, firstly, the cleaned coconut husks were chopped then mixed with lacca kerr resin and alcohol to make a composite dough. Then the dough were pressed with 130 psig at a 100oC within15 minutes. After that, the biocomposite was allowed to ambient temperature, then it properties were observed. To find the best product properties, the ratio of basic materials were varied. The ratio of coconut husk: lacca kerr resin was used ranged from 0.6 g/mL to 1.4 g/mL. The characterization of product properties were carried out based on ASTM D-638 and under guidance of the Indonesian National Standard (SNI) 03-2105-2006. Based on results, it was found that the best biocomposite observed had properties such as density of 0.45 g/cm3 , water content of 8.8% (maximum SNI requirement of 14%), degree of swelling of 67.6%, tensile strength of 43.4 kgf / cm2 (minimum SNI requirement of 3, 1 kgf / cm2 ), Young's modulus of 1219.2 kgf/cm2 , elongation of 67.7%, conductivity of 1.8 10-8 /.m. Some of these characteristics have met the Indonesian national standard (SNI).
Pembuatan dan Karakterisasi Membran Komposit sPEEK-PVA dengan Bahan Isian Grafena Oksida untuk Sel Bahan Bakar Methanol Elisa Putri Nastiti; Nur Hidayati
Eksergi Vol 17, No 2 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i2.3729

Abstract

Direct Methanol Fuel Cell (DMFC) is a fuel cell technology that convert chemical energy into electrical energy directly. Sulfonated polyether ether ketones (sPEEK) have potential as proton exchange membranes. Modification of sPEEK with poly vinyl alcohol (PVA) and adding graphene oxide (GO) is expected to reduce methanol cross over. This study was designed to examine the characteristics of the sPEEK-PVA composite membrane using the independent variable variation of GO 2.5-10% w/w. The results showed that water uptake in the range of 20-33%, swelling degree in the range of 10-17.5%, the ion exchange capacity was 0.59-0.75 meq/g, and the methanol permeability was 2.82-4.2 x10-6 cm2 /s. The characters shown are comparable with Nafion's characters and have the potential to be developed because they are superior in terms of raw material prices
Efek Pretreatment Ultrasonikasi Terhadap Hidrolisis Enzimatis Spirulina platensis Residue Indriana Lestari; Heni Anggorowati; Faizah Hadi
Eksergi Vol 18, No 1 (2021): Vol 18, No. 1 (2021)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v0i0.4559

Abstract

The development of renewable energy from microalgae sources is still being studied to overcome the world energy crisis, one of which is biodiesel from Spirulina platensis. However, the extraction process from Spirulina platensis to obtain oil leaving waste called Spirulina platensis residue (SPR). SPR still contains carbohydrates in the form of cellulose in cell walls and starch in plastids. Carbohydrates can be converted into bioethanol through the hydrolysis process. To optimize the enzymatic hydrolysis of carbohydrates, pretreatment is needed to break down the cell walls. One method of pretreatment is ultrasonication. This study aimed to determine the effect of ultrasonication pretreatment on enzymatic hydrolysis. Ultrasonication was carried out with time variations (15, 30, and 45 minutes) then continued hydrolysis at 40 oC for 8 hours using α-amylase and glucosidase (1: 1) enzymes. The results of hydrolysis in the form of reducing sugars were analyzed using the Nelson Somogyi method and obtained an optimal pretreatment time is 30 minutes with a reducing sugar concentration of 2.493,3 mg/L
Profil Release Enkapsulasi Antosianin, Flavonoid dan Fenolik pada Kulit Semangka Menggunakan Metode Spray Drying Lilis Kistriyani; Farah Fauziyyah; Sri Rezeki
Eksergi Vol 17, No 2 (2020): Volume 17 No 2 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i2.3098

Abstract

Daerah Istimewa Yogyakarta merupakan salah satu daerah yang memiliki potensi bencana alam yang cukup tinggi. Makanan adalah bahan habis pakai yang paling dibutuhkan saat bencana alam terjadi. Untuk menjaga makanan bergizi yang akan didistribusikan ke korban bencana alam tetap layak untuk dimakan, diperlukan suatu adanya alternatif berupa pengawet alami makanan. Dalam penelitian ini, dipilih kulit semangka sebagai bahan untuk membuat pengawet alami karena mengandung flavonoid dan antosianin. Tujuan penelitian ini adalah untuk mengetahui banyaknya kandungan total antosianin, flavonoid dan fenolik pada kulit semangka merah serta mengetahui pengaruh komposisi kitosan terhadap kemampuan pelepasan antosianin, flavonoid dan fenolik pada makanan. Penelitian ini dilakukan dengan metode ekstraksi dan enkapsulasi. Pada proses enkapsulasi digunakan teknik spray drying. Analisa yang dilakukan antara lain pengujian analisis kandungan Total Antosianin (TA), Total Flavonoid (TF) dan Total Fenolik (TPC) di dalam supernatant, serta analisa uji in vitro (uji kemampuan pelepasan flavonoid dan fenolik) pada makanan. Kandungan total antosianin pada kulit semangka merah sebesar 0,1113 mg/L. Kandungan total flavonoid pada kulit semangka merah sebesar 0,6159 g/mL. Kandungan total fenolik kulit semangka merah sebesar 0,3410 g/mL. Pada uji in vitro untuk senyawa flavonoid maupun fenolik, terjadi ketidakstabilan pelepasan kadar flavonoid dan fenolik terhadap waktu pada variasi kitosan 0,4 gram, 0,5 gram, dan 0,6 gram. Namun dari hasil rata-rata pelepasan kadar flavonoid dan fenolik, yang paling tinggi terjadi pada variasi kitosan 0,6 gram, dengan masing-masing nilai yaitu untuk flavonoid 0,1172 gram/mL dan untuk fenolik 0,0867 gram/mL. Hal ini menunjukkan bahwa semakin tinggi kadar kitosan, maka pelepasan kadar flavonoid dan fenolik juga meningkat.
Biogas Production from Vegetables and Fruit Wastes Using Anaerobic Floating Bioreactor soeprijanto soeprijanto; Anfi Reynikha Fatullah; Sashi Agustina; Dyah Firdha Amalia; Alif Adi Kaisar
Eksergi Vol 17, No 2 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i2.3733

Abstract

Markets and supermarkets are one of the pillars of the country's economy, besides that, they are also the biggest contributors to vegetable and fruit waste which can cause various environmental problems. Therefore, the abundance of vegetable and fruit waste produced by markets and supermarkets can be utilized as environmentally friendly alternative energy, namely biogas. This study aimed to determine the effect of organic loading rate (OLR) on biogas production and gas composition in a continuous anaerobic floating bioreactor using mixed vegetable and fruit waste. A 40-l anaerobic floating bioreactor was utilized and the hydraulic retention time was 10 days; one kg of vegetable and fruit wastes at a 1:1 mass ratio was added with water to 4 l and introduced during 25 days; the daily biogas production was collected in a floating drum and measured as volume. The maximum biogas yield was 0.0452 m3/kg, achieved using the OLR of 0.0125 kg/l.day.  The use of OLR of 0.0250, 0.0375 and 0.0500 kg/l.d reached biogas yields of 0.0435, 0.0282, and 0.0163 m3/kg, respectively. The composition of the maximum biogas yield was 68.17% CH4, 19.34% CO2, 1.85% H2S, and 0.64% NH3. 

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