Setijo Bismo
Department of Chemical Engineering, Faculty of Engineering, University of Indonesia, Depok 16424, Indonesia

Published : 9 Documents
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Performance Test with TiO2 Modified Activated Carbon on Pilot Scale Phenol Removal

IPTEK The Journal for Technology and Science Vol 19, No 4 (2008)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

The integrated of activated carbon adsorbent and TiO2 photocatalyst (TiO2/AC) has been synthesized and evaluated to remove phenol in the continuous pilot scale system. TiO2/AC was prepared by mixing of AC into sol system consisting of TiO2 Degussa P-25, water, and tetraehtyl orthosilicate (TEOS) solution as a source of silica. The mixtures then evaporated at ±97oC and calcined at 400oC. Performance test of the material was conducted using Tubular-V-Collector (TVC) reactor that equipped with 14 UV black light lamps. The experimental results show that the phenol could effectively be removed through simultaneous adsorption and photocatalysis. Within the residence time of 6 minutes, TiO2/AC could continuously remove the 50 ppm of phenol by 100% phenol removal as long as 5 hours.

Magnetic Field Effects on CaCO3 Precipitation Process in Hard Water

Makara Journal of Technology Vol 10, No 2 (2006)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

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Abstract

Magnetic treatment is applied as physical water treatment for scale prevention especially CaCO3, from hard water in piping equipment by reducing its hardness.Na2CO3 and CaCl2 solution sample was used in to investigate the magnetic fields influence on the formation of particle of CaCO3. By changing the strength of magnetic fields, exposure time and concentration of samples solution, this study presents quantitative results of total scale deposit, total precipitated CaCO3 and morphology of the deposit. This research was run by comparing magnetically and non-magnetically treated  samples. The results showed an increase of deposits formation rate and total number of precipitated CaCO3 of magnetically treated samples. The increase of concentration solution sample will also raised the deposit under magnetic  field. Microscope images showed a greater number but smaller size of CaCO3 deposits form in magnetically treated samples, and aggregation during the processes. X-ray diffraction (XRD) analysis showed that magnetically samples were dominated by calcite. But, there was a significant decrease of calcite’s peak intensities from magnetized  samples that indicated the decrease of the amount of calcite and an increase of total amorphous of deposits. This result  showed that magnetization of hard water leaded to the decreasing of ion Ca2+ due to the increasing of total CaCO3 precipitation process.

The Effect of Ozone and Zeolite Concentration to the Performance of the Treatment of Wastewater Containing Heavy Metal Using Flotation Process

Makara Journal of Technology Vol 12, No 1 (2008)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

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Abstract

Industrial wastewater which contains heavy metal cannot be disposed to the environment directly, due to its toxicity. In this research, separation of metal from wastewater was conducted by sorptive flotation method, using Lampung natural zeolite as bonding agent. The most common diffuser used in the flotation process is air or oxygen. In this research, ozone is used as diffuser because it is a stronger oxidant and more dissolvable in water than oxygen. Besides, ozone is a coagulant aid and disinfectant. With ozone as diffuser, it is expected that the process become faster with higher efficiency. This research was conducted to determine ozone effectiveness as diffuser, compared with other diffuser, and also to determine optimum concentration and effectiveness of zeolite in flotation of iron, nickel and copper. The research result shows that separation of iron with air diffuser is 90.8%, air-oxygen diffuser is 95.7%, air-ozone (from air) diffuser is 99.7%, and air-ozone (from oxygen) diffuser is 99.7%. Natural zeolite is effective as bonding agent with optimum concentration equal to 2 gram/liter, producing separation percentage for iron equal to 99.70%, copper equal to 88.98% and Nickel equal to 98.46%.

The Plasma Electrolysis Phenomenon in a Two-Compartment Reactor for Chlor-Alkali Production

Makara Journal of Technology Vol 17, No 2 (2013)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

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Abstract

Chlor-alkali is one of the most important processes in the chemical industry. It produces chlorine and caustic soda, which become the main feedstock of daily products. The aim of this study is to report the phenomenon of plasma electrolysis and how it can be used in chlor-alkali production for more efficient energy consumption. When the plasma is formed, the current fluctuates and gradually declines. Plasma electrolysis begins with the process of electrolysis itself. Due to Joule heating, gas bubbles are formed and a sheath is made on both electrodes, resulting in the plasma field. Plasma electrolysis can be identified by its radical production. The higher the voltage and concentration, the greater the production of radicals. In 10 minutes or less, the number of OH radicals produced can reach 4 ppm at 400 V and 0.1 M. This amount is relatively small and is caused by other reactions consuming OH radicals to form other radicals such as chlorine. The energy consumption of plasma electrolysis in this study can reach 16 kJ/mmol Cl2 at 0.5 M NaCl solution.

Effects of Ph on Calcium Carbonate Precipitation Under Magnetic Field

Makara Journal of Technology Vol 13, No 2 (2009)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

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Abstract

Magnetic field effect on CaCO3 precipitation is the key parameter in evaluating the effectiveness of Anti-scale Magnetic Treatment (AMT). The purpose of this study was to investigate magnetic fields influence on CaCO3 precipitation in high and low super-saturated CaCO3 solution by varied pH CaCO3 solution using circulation flow fluid system. The observation results in the high super saturated solution (pH 8.5) showed the increase of precipited CaCO3 in magnetized solutions compared to those in non-magnetic solution during circulation process. In the low super-saturated CaCO3 solution (pH 6.4) it was found that magnetic treatment increased CaCO3 precipitation after circulation process. In high super-saturated solution, magnetic field strengthens ion interactions, which reduce precipitation during circulation process. However, in low super-saturated CaCO3 solution, magnetic field weakens hydrate ion interaction which indicated by decreasing of the conductivity of solution. It increases the precipitation of CaCO3 after the circulation of magnetization process has completed.

Formation of CaCO3 Particle and Conductivity of Na2CO3 and CaCl2 Solution Under Magnetic Field on Dynamic Fluid System

Makara Journal of Technology Vol 15, No 1 (2011)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

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Abstract

Hard  water  causes  the  CaCO3  scale  formation  on  the  pipe  walls and  heat  exchanger  equipments  in  industrial  or domestic  water  processes.  A  great  number  of  experimental  researches  on  the  prevention  of the  CaCO3  precipitation process  by  magnetic  field  have  been  carried  out.  In  this  research,  Na2CO3  and  CaCl2  solutions  was  magnetized  in  the circulated  flow  condition  (dynamic  fluid  system).  The  velocity  of  fluid  and  the  circulation  time  was  modified  to examine  its influences  to  the  magnetization  process.  CaCO3  content  was measured  by  titration  method  of  EDTA complexometry.  Conductivity  test  was  conducted  to  find  out  hydrate  ion  bonding.  The  results  showed  that magnetization increased the CaCO3 formation and the optimum process reaches for 10 minutes circulation on 0.554 m/s of flow rate. Magnetic field decreases the conductivities of Na2CO3 and CaCl2  solution, hence reduced the ion hydrate bonding. These results showed that magnetization on Na2CO3 and CaCl2 ionic solution was effective in controlling the CaCO3 formation by increasing CaCO3 precipitation.

PENGOLAHAN AIR YANG MENGANDUNG LINEAR ALKYL BENZENE SULFONATE (LAS) DAN AMONIA DENGAN KOMBINASI PROSES OZONASI GELEMBUNG MIKRO DAN FILTRASI MEMBRAN

Purifikasi Vol 12 No 2 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

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Abstract

Salah satu upaya yang dilakukan untuk mengolah air yang mengandung senyawa Linear Alkyl BenzeneSulfonate (LAS) dan amonia adalah dengan proses ozonasi gelembung mikro dan filtrasi membran. Prosesini memanfaatkan keberadaan radikal hidroksida yang merupakan oksidator kuat yang mampu menguraikansenyawa organik dan anorganik bersifat racun dan sulit terurai di dalam air. Dari penelitian ini didapatkanbahwa proses ozonasi gelembung mikro dan filtrasi membran cukup efektif untuk menyisihkan senyawaLAS, namun tidak cukup efektif untuk menyisihkan senyawa amonia dalam air. Persentase penyisihan totalLAS untuk konsentrasi awal 30 mg/L, 50 mg/L dan 100 mg/L masing-masing diperoleh sebesar 89,82 %;84,20% dan 81,49% dan amonia sebesar 17,07%.

PENGOLAHAN AIR YANG MENGANDUNG LINEAR ALKYL BENZENE SULFONATE (LAS) DAN AMONIA DENGAN KOMBINASI PROSES OZONASI GELEMBUNG MIKRO DAN FILTRASI MEMBRAN

Purifikasi Vol 12 No 2 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

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Abstract

Salah satu upaya yang dilakukan untuk mengolah air yang mengandung senyawa Linear Alkyl Benzene Sulfonate (LAS) dan amonia adalah dengan proses ozonasi gelembung mikro dan filtrasi membran. Proses ini memanfaatkan keberadaan radikal hidroksida yang merupakan oksidator kuat yang mampu menguraikan senyawa organik dan anorganik bersifat racun dan sulit terurai di dalam air. Dari penelitian ini didapatkan bahwa proses ozonasi gelembung mikro dan filtrasi membran cukup efektif untuk menyisihkan senyawa LAS, namun tidak cukup efektif untuk menyisihkan senyawa amonia dalam air. Persentase penyisihan total LAS untuk konsentrasi awal 30 mg/L, 50 mg/L dan 100 mg/L masing-masing diperoleh sebesar 89,82 %; 84,20% dan 81,49% dan amonia sebesar 17,07%.

EFEK MEDAN MAGNET PADA PENURUNAN KESADAHAN DAN PENCEGAHAN PEMBENTUKAN KERAK CaCO3

Jurnal Sains Materi Indonesia Edisi Khusus Oktober 2007
Publisher : Center for Science & Technology of Advanced Material - National Nuclear Energy Agency of

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Abstract

EFEK MEDAN MAGNET PADA PENURUNAN KESADAHAN DAN PENCEGAHAN PEMBENTUKAN KERAK CaCO3.Metode MWT (Magnetic Water Treatment) merupakan alternatif potensial yang dapat digunakan untuk mengurangi terbentuknya deposit kerak CaCO3, namun hingga saat ini aplikasi metode ini masih mengundang kontroversi karena pengaruhnya yang belum jelas. Di sisi lain, masih terdapat pro dan kontra di kalangan para penelitimengenai pengaruh dan efektivitas proses magnetisasi itu sendiri. Oleh karena itu, dibutuhkan penelitian lebih lanjut dan komprehensif yang dapat menjelaskan efektivitas metode ini secara lebih ilmiah. Penelitian ini dilakukan untukmenguji pengaruhmedan magnet terhadap presipitasi CaCO3 saat magnetisasi dan tendensi presipitasi setelah magnetisasi filtrasi dari sampel air sadah yang disirkulasi melewati medan magnet.Medan magnet dihasilkan dari beberapa pasang magnet permanen berbasis Nd-Fe-B dengan kuat medan 5200 Gauss. Jumlah CaCO3 yang terbentuk diukur dengan metode titrasi kompleksometri EDTA (Ethylene Diamine Tetra-acetic Acid). Variabel kondisi operasi meliputi laju alir dan waktu sirkulasi. Magnetisasi menyebabkan kenaikkan presipitasi relatif sebesar 13,1 % saat magnetisasi dan penurunan presipitasi relatif sebesar 60,5 % sesudah magnetisasi filtrasi untuk laju alir 1,33 L/min dan waktu sirkulasi 30 menit. Penelitian ini menunjukkan bahwa magnetisasi air sadah dapat meningkatkan presipitasi CaCO3 saat magnetisasi dan mengurangi tendensi presipitasi CaCO3 setelah magnetisasi filtrasi.