Browsing by Author "Yenti Silvia Reni"

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    Fermentasi Nira Nipah Menjadi Bioetanol Menggunakan Sacharomyces cereviceae Pada Fermentor 70 Liter
    (2013-03-20) Abdullah, Muhammad Irsyad; Chairul; Yenti Silvia Reni
    Ethanol consumption of the world for a variety of uses has increased very significantly in recent years. Therefore it is necessary to alternate sources of raw materials to manufacture bioethanol and bioethanol production can be increased. Nipa sap is one of potential materials to be processed into bioethanol. Availability of nypa palm land in Indonesia and a fairly high sugar content (15-20%) makes nipa sap has the potential to be processed into bioethanol, so that produce an useful and high valuable product and then in education, that is give data process fermentation of nipa sap with comparison of pH and scale of fermentation. Through a fermentation process using yeast Saccharomyces cereviceae, glucose is converted into bioethanol and carbon dioxide. Starter preparation is done by the yeast Saccharomyces cereviceae inoculum in the 10% of fermentation medium so that yeast is able to adapt and ready for fermentation. Fermentation takes place in batches with a volume of 50 liters of fermentation medium, variations in the pH 4.5, 5.0, 5.5 and variations of fermentation time of 24, 36, 48, 60 dan 72 hours. The stirring speed of 200 rpm and temperature of fermentation at room temperature (25 - 30 0C). Ethanol concentrations were analyzed using alkoholmeter. The process of optimum fermentation conditions indicated in the addition of starter pH 4,5 and fermentation time of 36 hours of the initial sugar concentration of 221,163 mg/ml. Bioethanol concentration obtained in this condition is 14% (v/v) or 112,793 mg/ml with the acquisition of 97,969% yield.
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    Fermentasi Nira Nipah Skala 50 Liter Menjadi Bioetanol Menggunakan Saccharomyces Cerevisiae
    (2013-06-27) Umaiyah, Ade Sri; Chairul; Yenti Silvia Reni
    One of the natural resources that can be utilized alternative into bioethanol is palm sap. Preparation stater done by culturing medium Saccharomyces cereviseae as developer on 10% yeast fermentation medium thus able to adapt and be ready to do the fermentation. This study aims to make bioethanol from palm sap 50-liter scale with variations in pH 4,5; 5 and 5,5 and fermentation time 24, 36, 48, 60 and 72 hours.. Batch fermentation process takes place with a stirring speed of 200 rpm and temperature of fermentation at room temperature (25-300C). The optimum fermentation conditions indicated on the initial conditions of pH 4,5 and fermentation time of 48 hours the acquisition of or 9% .
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    Kajian Pengaruh Variasi Ukuran Partikel dan Lama Waktu Pengadukan pada Proses Pembuatan Asam Oksalat dari Ampas Tebu
    (2013-07-16) Wulandari R.G, Agustin; Yenti Silvia Reni; Herman Syamsu
    Bagasse is a by-product from the processing of sugar cane into sugar. The growing number of bagasse quantitatively into environmental problems that require attention and special handling. Bagasse contains cellulose, hemicellulose and lignin. Cellulose which contained in bagasse can be processed into useful products, such as oxalic acid by means of fusion with sodium hydroxide. Oxalic acid will be produced with the addition of calcium chloride and sulfuric acid. This research was conducted to study the effect of variations of the particle size and the length of time under stirring. Based on the results of the research that has been done using bagasse as much as 15 grams, 4N NaOH concentration, the melting time is 105 minutes, the melting temperature is 180 °C, stirring speed is 300 rpm, highest product yield (%) obtained was 4,333% at particle size 40 mesh and time under stirring for 20 minutes, as much as 0,65 grams.
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    Pengaruh Penambahan KH2PO4, MGSO4.7H2O, dan (NH4)2SO4 Terhadap Fermentasi Nira Nipah Menjadi Bioetanol Menggunakan Sacharomyces cereviceae pada Fermentor 70 Liter
    (2013-07-16) Firnanda, Yerri; Chairul; Yenti Silvia Reni
    Ethanol consumption of the world for a variety of uses has increased very significantly in recent years. Therefore it is necessary to alternate sources of raw materials to manufacture bioethanol and bioethanol production can be increased. Nipa sap is one of potential materials to be processed into bioethanol. Availability of nypa palm land in Indonesia and a fairly high sugar content (15-20%) makes nipa sap has the potential to be processed into bioethanol. Through a fermentation process using yeast Saccharomyces cereviceae, glucose is converted into bioethanol and carbon dioxide. Starter preparation is done by the yeast Saccharomyces cereviceae inoculum in the 10% of fermentation medium so that yeast is able to adapt and ready for fermentation. Fermentation takes place in batches with a volume of 50 liters of fermentation medium, variety of nutrient enrichment KH2PO4 (0.6, 0.9 1.2 g / l), MgSO4.7H2O (0.3, 0.4, 0.5 g / l) , and (NH4) 2SO4 (0.5, 0.6, 0.7 g / l) and variations of fermentation time 24, 30, 36, 42, 48, 54, 60, 66 and 72 hours. Stirring speed of 200 rpm and temperature of fermentation at room temperature (25 - 300C). Ethanol concentration was analyzed by using Alkoholmeter. The process of optimum fermentation conditions shown in run 3 with variations addition to a concentration of 0.5, 0.7, 1.2 g / l and fermentation time 60 hours with initial sugar concentration of 205.278 mg / ml. Ethanol concentrations obtained in these conditions was 13% (v / v) or 102.609 mg / ml with the acquisition of 98.010% yield.
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    Studi Kinetika Adsorpsi Logam Cu2+ dengan Menggunakan Adsorben Zeolit Alam Teraktifasi
    (2013-08-26) Hidayati, Betty; Sunarno,; Yenti Silvia Reni
    Copper metal is a heavy metal from industrial waste and relatively often found as contaminants in the water, because it was the presence of copper metal waste should be minimized. One method that has been developed to minimize the presence of Cu2+ is the metal adsorption process, is one of the natural zeolite adsorbents are widely used for the adsorption process because it is widely available in nature and has a high selectivity. This study aims to determine a suitable kinetic model for metal adsorption process of Cu2+ to see the power adsorption activated natural zeolite and the influence of temperature on the adsorption rate constant. The study was conducted by varying the contact time (0, 15, 30, 45, 60, 75 and 90 minutes) and temperature (300C, 400C and 500C). Copper metal adsorption results were analyzed using atomic absorption spectrophotometer (AAS). The result showed that the model is suitable for metal adsorption kinetics of Cu2+ with activated natural zeolite following the model of first order with a value of k = 0.0119 min-1 for the variation of the contact time and each k = 0,0111 min-1; 0,0123 min-1; 0,0145 min-1 for a temperature variation of 300C, 400C and 500C and the value of the activation energy for the adsorption process is equal to 10,841 kJ/mol.