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All Journal Research Report - Engineering Science Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences JPS Unimus
Hudaya, Tedi
Jurusan Teknik Kimia, Fakultas Teknologi Industri Universitas Katolik Parahyangan, Bandung
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Environmental Science Physics Social Sciences Other

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Kajian Proses Otoksidasi Katalitik Gliserol menjadi Asam Format Jerry Susanto; Tedi Hudaya; Tatang Hernas Soerawidjaja
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

The Optimization of UV/H 2 O Process for DYA (Dianic Yellow Ace) Textile-Dye Wastewater Treatment Tedi Hudaya; Geoffery Hariyanto; Winda Andriany
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

West Java region, especially in Bandung area, has many textile dyeing industries which are usually placed in a densely populated area. If not properly handled, the wastewater effluents will cause considerable pollution problems to the surrounding water streams due to toxic and non-biodegradable synthetic dyes content characterized by a very low BOD5/COD ratio (< 0.1).  This research studied the application of UV/H2O2 method for treating textile-dye (Dianic Yellow Ace – DYA) waste water in a pilot scale (50 L) multi-lamp bubble column photoreactor. The prime target of the treatment was to increase the BOD5/COD ratio until the biodegradability threshold was reached (> 0.1), prior to further treatment by a cheaper conventional biological method.  Two major operating conditions, the initial H2O2 concentration and pH were varied, using Central Composite Design, between 0.026 – 0.874 % w/w, and 0.17 – 5.83, respectively.  This study used a synthetic wastewater with color content similar to a  real waste water from a textile dyeing industry in Bandung.  Within the experimental condition range, 51 – 94% color content was successfully eliminated within 6 hours illumination period using 3 x 75 Watt low pressure Hg UV lamp.  Optimum conditions from 2nd order model optimization showed that the best result of 95.5% color removal could be obtained at initial H2O2 concentration of 0.53 % w/w and pH 3.35. Additional test with a real industrial wastewater under 5 x 75 Watt UV irradiation under those best conditions resulted in BOD5/COD ratio increase from 0.01 to 0.1(biodegradability threshold) within 9.5 hours.  
Synthesis of Biokerosene through Electrochemical Hydrogenation of Terpene Hydrocarbons from Turpentine Oil Tedi Hudaya; Ongky Widjaja; Antonius Rionardi; Tatang Hernas Soerawidjaja
Journal of Engineering and Technological Sciences Vol. 48 No. 6 (2016)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2016.48.6.2

Abstract

Indonesia possesses great potential for developing renewable resources as alternative fuels. For example, turpentine oil obtained from Pinus merkusii, which contains mostly monoterpene hydrocarbons (C10H16). The oil is highly suitable to be processed for biokerosene or even jet biofuel. It consists of hydrocarbons within the range of C10 to C15. However, it contains insufficient H and thus needs to be upgraded. In the present work, electrochemical hydrogenation was used for upgrading. In the electrochemical cell, stainless steel, silver, and carbon were used alternately for the anode, while copper and silver Raschig rings were used for the cathode. An electrolyte solution of cuprous ammonium formate was utilized not only as a source of H but also to draw the unsaturated hydrocarbons into the aqueous phase. The electrolyte : oil ratio (up to 2:1), electrolyte concentration (between 0.4 and 2 M) and reaction time were varied throughout the experiments. The bromine number (unsaturation level) of the turpentine oil, which was initially 1,86 (mole Br2/mole), was lowered significantly to 0.69-0.90. Promising increase of smoke point values were observed from 11 mm to 16-24 mm, indicating a higher H content of the processed oil, thus making it suitable as a substitute for petroleum kerosene.
Synthesis of Bio-hexane and Bio-Hexene from Sorbitol Using Formic Acid as Reducing Agent Michael Gunawan; Tedi Hudaya; Tatang Hernas Soerawidjaja
Journal of Engineering and Technological Sciences Vol. 53 No. 1 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.1.6

Abstract

Sorbitol (C6H14O6) is a sugar alcohol that can be synthesized from cellulose and has a similar skeletal structure as hexane (C6H14) so that it can straightforwardly be converted to hexane through deoxygenation. The bio-hydrocarbon synthesis from sorbitol in this investigation consisted of two main processes, namely synthesis of 2-iodohexane and deiodization of 2-iodohexane. The synthesis of 2-iodohexane from sorbitol and hydroiodic acid (HI) was conducted in a reflux system, to which formic acid as reducing agent was added gradually during the reaction to regenerate the iodine back to HI. The HI/sorbitol ratio (2:1 and 5:1), reaction temperature (90 °C, 105 °C, and 120 °C), and reaction time (between 2 and 6 hours) were varied throughout the experiment. Deiodization of 2-iodohexane was conducted via gas phase pyrolysis at various temperatures (265 °C to 285 °C) and reaction times (30 and 45 minutes). The sorbitol was effectively converted to a mixture of 2-iodohexane, hexane and other bio-hydrocarbons, with a 2-iodohexane yield of 23.15%. In the optimal reaction condition, pyrolysis of 2-iodohexane resulted in bio-hydrocarbon with a yield of 77.52%. The resulted hydrocarbon products were mixtures consisting of alkanes and alkenes.
PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH (PROBLEM BASED LEARNING ) DALAM MATA KULIAH MANAJEMEN LIMBAH B3 Hans Kristianto; Tedi Hudaya
JURNAL PENDIDIKAN SAINS UNIVERSITAS MUHAMMADIYAH SEMARANG Vol 6, No 2 (2018): JURNAL PENDIDIKAN SAINS (JPS)
Publisher : Pendidikan Kimia Unimus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jps.6.2.2018.41-47

Abstract

Perubahan metode pembelajaran yang sebelumnya berpusat pada pengajar (teacher-centered learning) menjadi berpusat pada siswa (student-centered learning), menuntut penggunaan berbagai model pembelajaran yang inovatif. Dalam penelitian ini dipaparkan penerapan model pembelajaran berbasis masalah (problem based learning; PBL) dalam mata kuliah Manajemen Limbah Bahan Beracun dan Berbahaya (B3) di Program Studi Teknik Kimia UNPAR pada semester genap 2016/2017, dengan tujuan mengamati  perubahan gaya belajar mahasiswa sebelum dan setelah pembelajaran dengan model PBL dengan menggunakan kuesioner Grasha. Selain itu mahasiswa diminta untuk mengisi kuesioner evaluasi pelaksanaan kegiatan pembelajaran. Teramati perubahan gaya belajar mahasiswa, yaitu pada menurunnya gaya belajar avoidant, kenaikan pada gaya belajar competitive dan collaborative. Sekalipun terlihat perubahan, hasil tersebut belum signifikan secara statistik. Hasil umpan balik dari mahasiswa peserta kuliah pun cukup positif, karena mahasiswa merasa lebih aktif, belajar bekerja dalam tim, dan berkomunikasi. Hasil-hasil positif yang ditunjukkan dalam penerapan model PBL pada mata kuliah ini membuka peluang untuk menerapkan model pembelajaran serupa pada berbagai mata kuliah lain.
Co-Authors Anastasia Prima Kristijarti Antonius Rionardi Antonius Rionardi Felicia Elsa Felicia Kristianti Geoffery Hariyanto I Gede Pandega Wiratama Jerry Susanto Kristianto, Hans Liana Liana Michael Gunawan Michael Gunawan Nita Ardelia Jairus Ongky Widjaja Rionardi, Antonius Soerawidjaja, Tatang Hernas Susiana Prasetyo S Tatang Hernas Soerawidjaja Tatang Hernas Soerawidjaja Tatang Hernas Soerawidjaja Tatang Hernas Soerawidjaja Tatang Hernas Soerawidjaja Tatang Hernas Soerawidjaja Tatang Hernas Soerawidjaja Widjaja, Ongky Winda Andriany