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All Journal Seminar Nasional Teknik Kimia Kejuangan
Ronny Kurniawan
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Engineering Environmental Science

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Aplikasi Bioleaching Dalam Pemisahan Logam dari Batuan Mineral Pyrite dengan Menggunakan Bakteri Thiobacillus ferooxidans dan Fungi Aspergillus niger Ronny Kurniawan
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2015: Prosiding SNTKK 2015
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Pyrite (FeS2) is one of the types of sulphide minerals which are common in the nature. Many methods can be used to separate the metal content in pyrite, either chemical treatment, biological treatment, and physical treatment. This study generally aims to study the process of extracting metals Fe, Zn, and Al in the mineral pyrite using bioleaching process, and specifically aims to determine the effect of time and type of microorganisms based on the concentration and yield of the extraction and to study the effect of microorganisms on the selectivity of the metals extracted in the process of the mineral pyrite bioleaching. Parameters used are microorganisms volume (20% of the total volume of work), bioleaching temperature (35°C), the speed of stirrer (70 rpm) and time of bioleaching (10, 20, and 30 days); the type of the analyzed metal are Al, Zn, Fe; and the type of microorganism are Thiobacillus ferooxidans bacteria and Aspergillus niger fungi. The used analysis are AAS and ICP / MS. The result revealed that the time of bioleaching makes some effect on metal concentration in rafinat.The longer time of bioleaching can give the greater value on metal concentration in rafinat. The highest metal concentrations in the rafinat obtained at 759 ppm for the Al using a Thiobacillus ferooxidans bacteria. The highest yield in the rafinat obtained at 15,021% for the Zn using a Thiobacillus ferooxidans bacteria. Generally, Thiobacillus ferooxidans bacteria is better for extracting metals; Fe, Zn, and Al.
Kajian Pengaruh Ukuran Penambat Pada Fermentasi Etanol Secara Continue dengan Batu Apung Sebagai Media Penambat Pada Fermentor Kolom Fixed Bed Ronny Kurniawan; S.Juhanda S.Juhanda; Hany Figurhawa; Muhhamad Gandi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Ethanol production is increasing every year due to the great need. Ethanol is widely used as chemicalsynthesis ingredient, as a solvent and can be used as a fuel mixture of gasoline, there by ethanol become analternative renewable fuel. Difficulties often encountered in the fermentation process, namely the separationof the product of yeast used. Tethered cell method (immobilized cell) may be one method that can be used asan alternative, and pumice can be used as an immobilized media. The purpose of this study was todetermine ethanol concentration and value of ethanol yield in the continues fermentation process usingcoloumn fixed bed fermenters with pumice as an immobilized cell media and comparing with free cellcondition. The parameters in this study is glucose concentration of 150 g / L with a temperature of 34 ° C,pH 4.5, substrat flow rate of 0,555 mL/min , pumice height is 50% fermentor height, and the number of cellsthat is tethered. While the variable in this study include the condition of the cell that is free and immobilized ,pumice size with mesh 6/8 and mesh 16/18 . Results obtained with the best conditions on a continuousethanol fermentation in a fixed bed column was obtained on condition of immobilized cells with a pumice sizemesh 16/18 with ethanol consentrasion of 61.8 % v/ v, the value of ethanol yield at 23,22% w / w and theaverage percentage of cells that escape 0.213%.
Kajian Proses Pemurnian Etanol-Air dengan Metode Dehidrasi Cair dan Uap Menggunakan Zeolit Alam Modifikasi Ronny Kurniawan; S Juhanda; Salafudin Salafudin; Reski Purwanda; Nurkhatimah Utami
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Co-Authors Hany Figurhawa Muhhamad Gandi Nurkhatimah Utami Reski Purwanda S Juhanda S.Juhanda S.Juhanda Salafudin Salafudin