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Hidrolisis Mikroalga Tetraselmis chuii Dengan Variasi Konsentrasi Asam Sulfat Dan Temperatur Utami, Syelvia Putri; Miranda, Gilda; Amri, Amun
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Glucose is a monosaccharide which can be used as an energy source in bio-battery, to produce intermediate products (hydroxymethylfurfural, furfural, levulinic acid, and formic acid), and can be converted into bioethanol. Glucose is a sugar monomer produced after hydrolysis of cellulose and hemicellulose chains in land plants and water plants. Microalgae is a water plant that has a big potential to be converted into glucose. It has been known to use light and various carbon sources to produce carbohydrate. Tetraselmis chuii is a green microalgae, containing a large number of carbohydrate, fat, protein, vitamin, and mineral. As a green microalgae, Tetraselmis chuii has a cellulose and hemicellulose components in its cell wall without a lignin content. This research focused on the hydrolysis of microalgae using variation of sulphuric acid concentration and temperature as variables to produce glucose. Microalgae feedstock was mixed with different concentrations of sulphuric acid between 0.25-1.75% (v/v). Hydrolysis process was conducted under low temperatures at 60 and 70 oC for 30 minutes. The glucose was analyzed quantitatively using Spectrophotometer UV-Vis. The results showed that the highest glucose yield obtained was 48,40% and this was achieved when the hydrolysis occurred at 70 oC with 1.75% (v/v) sulphuric acid addition. This study revealed that the temperature and the sulphuric acid concentration are the important factors during acid hydrolysis of microalgae for glucose production.  Keywords : glucose, dilute sulphuric acid, hydrolysis, temperature, Tetraselmis chuii.
Hidrolisis Mikroalga Tetraselmis Chuii Menjadi Glukosa Menggunakan Enzim Selulase Utami, Syelvia Putri; Azzahra, Novia; Amri, Amun
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Microalgae Tetraselmis chuii is one of biomass which has a potential to be converted into glucose that can be used as raw materials for bioethanol production and other intermediate products. One of the process was used for glucose production by using enzymatic hydrolysis with enzyme cellulase. The purpose of this researches were to study the influence of the hydrolysis time and optimum conditions at enzymatic hydrolysis. The sequances of this research were raw materials analysis, enzymatic hydrolysis, and glucose analysis. The process of the hydrolysis by dissolving microalgae in a buffer solution of sodium acetate pH 5,5, pH was re-set by way of added to acetic acid in microalgae mixture. After certain pH was achieved, an enzyme cellulase was added into microalgae mixture and stirred at 100 rpm, the temperature of 400C and varied hydrolysis time. Manipulated variable on this study were hydrolysis time, namely 15, 45, 75 hours at the ratio of algae/enzyme 1:0,03. The results was obtained namely glucose, with the highest concentration of 2,78 g/L on operating conditions for 45 hours at the rasio algae/ enzyme 1:0,03.Keywords: cellulase, glucose, hydrolysis, Tetraselmis chuii, time
Hidrolisis Mikroalga Tetraselmis chuii Menjadi Glukosa Menggunakan Solvent H2SO4 Dengan Variasi Waktu Hidrolisis Utami, Syelvia Putri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Indonesia is maritime countries with high marine biodiversity. Mikroalgae is marine biota which has an important role in an ecosystem water and it has the chemical composition such as, high carbohydrate, protein and lipid. Tetraselmis chuii is green microalgae that contains cellulose and hemicelluloses, which adequate were converted into glucose. Glucose is one of building compound for producing hydroksimetilfurfural, levulinat acid, formic acid, bio battery, bioethanol, etc. Glucose can be produced by hydrolyzing microalgae with dilute sulfuric acid use a solvent. Microalgae was dissolved in diluted sulfuric acid then heated at 100oC. The purpose of this research were obtained operation condition for biomass loading and hydrolysis time to glucose production. Tetraselmis chuii which biomass loading 3,5 gram disssolved in dilute sulfuric acid 1% during 10, 20, 30, 40 and 50 minutes. The result show that the highest concentration of glucose was obtained 7,27 g/L in biomass loading by using 3,5 gram of Tetraselmis chuii for 30 minute at 100oC.Keywords: dilute sulphuric acid, glucose, hydrolysis, microalgae, cellulose
Dehidrasi Bioetanol Hasil Fermentasi Nira Nipah Dengan Modifikasi Bentonit Dan Variasi Rasio Adsorben Utami, Syelvia Putri; Hidayat, Wahyu; Chairul, Chairul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Energy need is continously supplied by fossil fuels source The existence of environmental issues and facts about the limited resources of fossil fuels results in an energy crisis that will cause disruption of the world economy. The energy crisis has stimulated efforts to the use and development of renewable fuels and benign envinronmentally. Another method is by using bioethanol derived from nypa sap as an alternative energy source that is renewable. This study aimed to obtain data correlation ratio between the adsorbent and bioethanol against purity ethanol by distillation-adsorption process, and then obtain data on the effect of modification of bentonite activation without the addition of starch and with the addition of starch to bioethanol purity by distillation-adsorption process, and characterize the physical properties of ethanol. This research was conducted in three phases: bioethanol fermentation, modified bentonite and bentonite purification by distillation-adsorption process. For distillation-adsorption, they were conducted at 78oC by using 200 mesh bentonite .This study focused on ratio bentonite and starch addition. They were 1:2, 1:3, 1:4 and 0%, 35%,40%, 45% respectively. The most effective process in bioethanol purification was distillation-adsorption employed 45% starch addition by using 1:2 activated bentonite. It raised concentration bioethanol 95% to 99.7% v/v.Keywords : Bentonite, bioethanol, destillation-adsorption, fermentation, nypa sap, starch
PRODUKSI BIOETANOL DARI MAHKOTA NANAS MENGGUNAKAN BAKTERI ZYMOMONAS MOBILIS DENGAN VARIASI KONSENTRASI INOKULUM DAN PENAMBAHAN NUTRISI Rahmadani, Suci; Muria, Sri Rezeki; Utami, Syelvia Putri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Depletion of fuel oil encourage to find alternative energy that can be renewable to support requirement energy. Therefore, looked for alternative sources of raw materials and the potential is lignocellulosic biomass. This study uses the crown of the pineapple as the main raw material. This pineapple crown containing cellulose that can be utilized as bioethanol. This study was conducted to produce ethanol by fermentation of cellulose pineapple crown with treatment concentration inoculum at 12%, 14% and 16% with the addition nutrition of urea 0,6 g/l and fermentation time of 24, 48, 72, 96 and 120 hours. The fermentation was conducted in batch process. The result showed that inoculum volume and substrate fermentation also ethanol increased since the population of cells improved. The highest yield of bioethanol is 6% (v/v) at inoculum concentred 14% and the fermentation time 96 hours.keywords : delignification, hydrolysis, fermentation, urea.
PELURUHAN BATANG GRAPHITE BATERAI BEKAS DENGAN METODE ELECTROCHEMICAL EXPOLIATION MENGGUNAKAN PELARUT ASAM SULFAT DAN SODIUM SULFAT UNTUK PRODUKSI GRAPHENE Harahap, Azhari; Amri, Amun; Utami, Syelvia Putri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Graphene is two dimensional material (2D) consisting of carbon atoms with a flat lattice configuration in a flexible hexagonal pattern. One of the materials that can be used as raw material in graphene synthesis is carbon used battery bar. The purpose of this research was to synthesize graphene using electrochemical exfoliation graphite (EEG) method and to study the process of exfoliation rate over 30, 60, 90, 120 and 150 minutes for 2.5 hours. Graphene was synthesized by using two solvents H2SO4 and Na2SO4 with varied concentrations of : 0.25 M, 0.5 M, 0.75 M and 1 M. From the synthesis results, the best exfoliation rate and the best yields were shown by Na2SO4 solvent at 1 M concentration with a yield of 21.83%. From the graphene conductivity test, the best conductivity was obtained by Na2SO4 solvent at 1 M concentration with conductivity value of 0,1698 ?-1.cm-1.Key words : Electrochemical exfoliation graphite, graphene, graphite.
Penentuan Persamaan Empiris Antara Debit Injeksi Air Dengan Produksi Minyak Bumi Di Eor Plant Balam Utami, Syelvia Putri; Furqan, Muhammad; Chairul, Chairul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Along with the decreasing availability of oil in the layers of the earth, it is necessary support from the technology or new effort to increase oil production. One of them is by way of water injection where the produced water is injected back into the earth to push oil to the surface. This research studied the relationship between the discharge of water injection and time of water injection against discharge of oil production. Processing of the data in this study performed using Microsoft Excel and Minitab software. This research was conducted in two stages. The first stage is the collection of field data which includes data discharge of water injection and discharge of oil production. For the second phase of data analysis using regression and correlation. The results showed that the best results of equations to predict the flow of water injection relationship with discharge of oil production is an empirical equation Y = -137 774 + 0,783 X with R2 value 0,987. While the influence of injection water flow to the discharge of the most significant of oil production is 6 days after water was injected.Keyword : Discharge of Water Injection, Discharge of Oil Production, Water Injection Time, Minitab, Regression and Correlation
Pembuatan Bioetanol Dari Kulit Nanas Dengan Metodeliquid State Fermentation (LSF) Dengan Variasi Waktu Dan Konsentrasi Inokulum Utami, Syelvia Putri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The world consumption of bioethanol for a variety of uses has increased very significantly in recent years. Pineapple skin is one of the potential materials to be processed into bioethanol. Availability of food waste material containing glucose as the skin is still fairly abundant pineapple and its utilization is limited only used for fertilizer and animal feed, so it is necessary for utilization of that adds value as well as a fairly high sugar content (13.65 % reducing sugar) makes the skin of pineapple has the potential to be processed into bioethanol. Through the process of fermentation using Zymomonas mobilis, glucose is converted into ethanol and carbon dioxide. Preparation of starter inoculum carried by Zymomonas Mobilis process. Fermentation takes place in batches with a volume of 1 liter of fermentation medium, fermentation time variation of pH 5 2 , 4 , 6 and 8 days and inoculum concentration variation of 5 , 10 and 15 % (v / v). Stirring speed of 200 rpm and temperature of fermentation at room temperature (25o – 30oC). Bioethanol concentration was analyzed by using gas Chromathography Mass Spectroscopy. The process of optimum fermentation conditions shown in inoculum concentration of 10% v / v and 4 days fermentation time. The concentration of bioethanol obtained under these conditions is 43.10 % (v / v) or 23.75 g / ml.Keyword :Bioethanol, Pineapple Peel, Fermentation, Zymomonas mobilis, Liquid State Fermentation
Transesterifikasi Minyak Goreng Bekas Dengan Katalis ZnO Sintesis Dari Presipitan Zinc Oksalat ; Pengaruh Variasi Rasio Mol Reaktan Dan Jumlah Katalis Utami, Syelvia Putri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Curently various types of catalysts have been investigated for the production of biodiesel from high free fatty acid feedstock. Waste Cooking Oils with high free fatty acid (FFA) can be used as a feedstock for biodiesel production. Various types of catalysts have been investigated for the production of biodiesel from high FFA feedstock. This research aims to sinthesize ZnO catalyst from ZnC2O4 presipitation. This catalyst was used for transesterification of CPO with high FFA into biodiesel. Then, the effect of variations in mole ratio of reactants and variations in the amount of catalyst on the yield of biodiesel produced will be studied. FFA content in the waste cooking oils is 8,16%. Therefore, Biodiesel production process was carried out with a two-stage reaction that was esterification and transesterification. The esterification reaction was held time 60 minutes at temperatures 65oC with H2SO4 catalyst as much as 1% w/w of oil. The transesterification reaction was held time 120 minutes at temperatures 65oC; the mole rato of oil : methanol were 1:6, 1:12, 1:18; ZnO catalyst amount were 0,3%, 0,4% and 0,5%; . The higest yield obtained was 92,12% in process with 1:18 in oil : methanol mole ratio and 0,5% catalyst amount. The produced biodiesel has density 867,8 kg/m3, viscosity 5,25 mm2/s, flash point 175oC, acid value 0,547 mg-KOH/g-biodiesel, saponification value 40,766 mg-KOH/g-biodiesel and alkyl ester content 98,647%.Keywords: biodiesel, esterification, transesterification, waste cooking oils, ZnO
Pemanfaatan Minyak Jelantah Menjadi Biodiesel Dengan Katalis ZnO Presipitan Zinc Karbonat : Pengaruh Waktu Reaksi Dan Jumlah Katalis Adhari, Hamsyah; Yusnimar, Yusnimar; Utami, Syelvia Putri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Biodiesel is a highly potential material to replace diesel fuel. Renewable and environmentally friendly. Waste cooking oil can be used as raw material for making biodiesel. Free fatty acid levels are high in waste cooking oil requiring pretreatment (esterification) in the process of making biodiesel. In this study transesterification reaction conducted by catalyst synthesized ZnO of ZnCO3. This study aims to determine the effect of variations in reaction time and variations the amount of catalyst to yield biodiesel produced. After esterification of free fatty acid levels in the oil can be lowered from 6.09% to 1.02%. The transesterification reaction was held at temperatures 65oC; The mole ratio of oil and methanol is 1:18; ZnO catalyst amount is 0,5%, 0,6% and 0,7%; reaction time is 50, 75, and 100 minutes. The highest biodiesel yield obtained was 94.31% on the amount of catalyst 0.7% w / w of cooking oil with a reaction time of 100 minutes. Characteristics of biodiesel produced, namely: density and viscosity at a temperature of 40°C is 866,50 kg/m3 and 5,74 mm2/s, The flash point is 190oC, acid value 0,60 mg-KOH/g-biodiesel and the content of alkyl ester 98,42%.Keywords: Biodiesel, Waste Cooking Oil, Esterification, Transesterification, ZnO