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All Journal Reaktor KARMAPATI (Kumpulan Artikel Mahasiswa Pendidikan Teknik Informatika) ISSN: 2252-9063 JURNAL AIR INDONESIA Journal of Engineering and Technological Sciences Journal of Engineering and Technological Sciences
I Gede Wenten
Department of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Bandung, Jalan Ganesha No. 10, Bandung 40132,
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Non Dispersive Chemical Deacidification of Crude Palm Oil in Hollow Fiber Membrane Contactor Purwasasmita, Mubiar; Nabu, Eryk Bone Pratama; Khoiruddin, K.; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 47, No 4 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (331.138 KB) | DOI: 10.5614/j.eng.technol.sci.2015.47.4.6

Abstract

Performance of chemical deacidification of crude palm oil (CPO) using aqueous NaOH solution in a polysulfone hollow fiber ultrafiltration membrane was  investigated. The effects of operating temperature, NaOH concentration and flow rates on percentage of free fatty acids (FFA) removal, oil loss, soap entrainment and overall mass transfer coefficient  were  evaluated. Overall mass transfer coefficients, soap content in oil and neutral oil loss all increased  when the  temperature  was increased from 60 to 70°C due to an increase of the FFA distribution value. A minimum 0.25 N of NaOH or a NaOH to FFA  molar ratio  of about 7.62 was  required to facilitate the expected extraction efficiency. The increased oil flowrate slightly enhanced the solute transport kinetics,  while the  aqueous phase flowrate did not significantly influence deacidification efficiency or mass transfer coefficient. About 97% of FFA removal was achieved within 4 hours. The maximum oil loss observed was 11% and the highest  soap content in the  oil without separation step was 3150 ppm. The values  of the  overall mass transfer coefficient varied  from 2.97×10-7 to 7.71×10-7 m/s. These results show the potential of using the non dispersive membrane contacting process for chemical deacidification of CPO as well as other vegetable oils.
Investigation of Electrochemical and Morphological Properties of Mixed Matrix Polysulfone-Silica Anion Exchange Membrane Khoiruddin, Khoiruddin; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 48, No 1 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (490.329 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.1.1

Abstract

Mixed matrix anion exchange membranes (AEMs) were synthesized using dry-wet phase inversion. The casting solutions were prepared by dispersing finely ground anion-exchange resin particles in N,N-dimethylacetamide (DMAc) solutions of polysulfone (PSf). Subsequently, nanosilica particles were introduced into the membranes. The results show that evaporation time (tev) and solution composition contributed to membrane properties formation. A longer tev produces membranes with reduced void fraction inside the membranes, thus the amount of water adsorbed and membrane conductivity are reduced. Meanwhile, the permselectivity was improved by increasing tev, since a longer tev produces membranes with a narrower channel for ion migration and more effective Donnan exclusion. The incorporation of 0.5 %-wt nanosilica particles into the polymer matrix led to conductivity improvement (from 2.27 to 3.41 mS.cm-1). This may be associated with additional pathway formation by hydroxyl groups on the silica surface that entraps water and assists ion migration. However, at further silica loading (1.0 and 1.5 %-wt), these properties decreased (to 1.9 and 1.4 mS.cm-1 respectively), which attributed to inaccessibility of ion-exchange functional groups due to membrane compactness. It was found from the results that nanosilica contributes to membrane formation (increases casting solution viscosity then reduces void fraction) and membrane functional group addition (provides hydroxyl groups).
The Influence of PEG400 and Acetone on Polysulfone Membrane Morphology and Fouling Behaviour Aryanti, P.T.P.; Joscarita, Shelli R.; Wardani, Anita K.; Subagjo, S.; Ariono, Danu; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 48, No 2 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.652 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.2.1

Abstract

Modification of polysulfone ultrafiltration membrane was conducted by blending polysulfone with PEG400 and acetone as additives. The influence of each additive on the resulted membrane morphology and fouling characteristics were investigated. The experimental results showed that the hydrophilicity of the polysulfone membrane was improved by the increase of PEG400 in the polysulfone membrane. The water contact angle of the membrane was decreased from 76.1° to 38.31° when 35 %wt of PEG400 was added into the polysulfone solution, while the water content of the membrane was increased by around 38%. The high concentration of PEG400 in the polysulfone solution led to the formation of longer finger-like cavities in the membrane structure and resulted in a thicker membrane skin layer. The high concentration of PEG400 also contributed to the increase in hydraulic resistance of the membrane due to organic matter fouling. This problem could be minimized by the addition of acetone into the polysulfone solution, which resulted in a lower fouling resistance of organic matter during up to five hours of peat water filtration.
Brine Effluents: Characteristics, Environmental Impacts, and Their Handling Ariono, Danu; Purwasasmita, Mubiar; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (413.638 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.4.1

Abstract

Brine discharge is one of the largest sources of wastewater from industrial processes. Because of the environmental impacts arising from improper treatment of brine discharge and more rigorous regulations of pollution control, industries have started to focus on waste minimization and improving the process of wastewater treatment. Several approaches have been proposed to provide a strategy for brine handling by recovering both brine and water or to remove pollutant components so it complies with environmental regulations when discharged. One of the most promising alternatives to brine disposal is reusing the brine, which results in reduction of pollution, minimizing waste volume and salt recovery. The brine may also contain valuable components that could be recovered for profitable use. Also, water recovery from brine effluent is generally performed to save water. In the case of rejected brine from desalination plants, water recovery from higher brine concentrations has huge potential for salt production. This paper gives an overview of different types of brine effluents, their sources and characteristics. Also discussed are impacts of brine on the environment and management options related to their characteristics.
Analysis of Protein Separation Mechanism in Charged Ultrafiltration Membrane Ariono, Danu; Aryanti, Putu Teta P.; Wardani, Anita Kusuma; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 50, No 2 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (663.584 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.2.4

Abstract

The separation mechanism of proteins on a charged ultrafiltration membrane was analyzed using the extended Nernst–Planck (N-P) model. The model was solved numerically based on experimental data during ultrafiltration of bovine serum albumin/BSA and hemoglobin at various pH (between 5 and 8) to obtain the flux parameter (Jv). The flux parameter was used to determine the effective charge of the membrane (f) and the actual membrane porosity (Ak). These two parameters were then used to predict the transport mechanism of proteins through the charged membrane. Higher flux was obtained during the ultrafiltration of BSA compared to hemoglobin. The most effective separation of mixed proteins occurred at pH 5 (aalbumin= 5). In addition, the mobility of a single protein was lower than when it was mixed with other proteins that had different charges. The effective charges of the membranes were varied between 0.99996 to 1.0000, which means that the fixed charge on the membrane structure was higher than the concentration of proteins, thus the effective charge of the membrane was not influenced by the presence of protein charge at various pH. On the contrary, the value of Ak was influenced by the type and charge of the proteins. A decrease of negative charge along with an increase of solution pH increased the porosity of the membrane, thus reducing the rejection of proteins.
Impurity Removal of Waste Cooking Oil Using Hydrophobic Polypropylene Hollow Fiber Membrane Aliwarga, Lienda; Widodo, Setyo; Suwardana, Novika; Darmawan, Hanna; Khoiruddin, Khoiruddin; Wenten, I Gede
Journal of Engineering and Technological Sciences Vol 51, No 2 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (29.163 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.2.5

Abstract

Removal of impurities from cooking oil is an important step in providing the possibility of WCO reuse to extend the life cycle of cooking oil, leading to a reduction of WCO disposal. This study was conducted to investigate the performance of a polypropylene (PP) hollow fiber ultrafiltration (UF) membrane for removal of impurities from WCO. The results showed that the membrane could remove water content up to 95% (at 0.1 MPa and 30 °C), but the color improvement was only 9.5% as indicated by the absorbance reduction. Within the range of the operation conditions (i.e. a trans-membrane pressure of 0.1-0.2 MPa and a temperature of 30-50 °C), the oil flux varied from 0.3 L.m‑2.h‑1 to 1.3 L.m-2.h-1. In long-term operation, the membrane wettability was improved as shown by the oil contact angle decreasing from 28.2 ± 1.5° to 14.4 ± 0.5°. This resulted in a higher oil flux. At the same time, the hydrophobicity was also increased, as indicated by an increase in the water contact angle from 95.4 ± 0.7° to 97.3 ± 1.1°.
Film Dokumenter Pembayaran Kaul Dengan Bulu Geles Di Desa Tambakan Kecamatan kubutambahan Kabupaten Buleleng ., Komang Gede Wenten; ., I Gede Mahendra Darmawiguna, S.Kom, M.Sc; ., I Made Ardwi Pradnyana, S.T., M.T.
KARMAPATI (Kumpulan Artikel Mahasiswa Pendidikan Teknik Informatika) Vol 6, No 1 (2017):
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/karmapati.v6i1.9326

Abstract

Tradisi lisan merupakan salah satu bentuk ekspresi kebudayaan daerah yang jumlahnya beratus-ratus di seluruh Indonesia. Tradisi Pembayaran Kaul dengan Bulu Geles adalah pembayaran janji atau hutang dengan menggunakan seekor anak sapi jantan sebagai sarananya. Tujuan dari penelitian ini adalah untuk : (1) mengimplementasikan Film Dokumenter Pembayaran Kaul Dengan Bulu Geles di Desa Tambakan (2) mengetahui respon pengguna terhadap Film Dokumenter Pembayaran Kaul Dengan Bulu Geles di Desa Tambakan. Metode penelitian yang digunakan dalam Film Dokumenter Pembayaran Kaul Dengan Bulu Geles di Desa Tambakan menggunakan metode cyclic strategy. Aplikasi ini diimplementasikan menggunakan Sony Vegas Pro 13.0 sebagai pembuat video. Pemanfaatan aplikasi pembuat video dari dampak kemajuan teknologi menyebabkan para remaja atau anak muda mampu berkreasi dalam mengolah video dengan berbagai efek sesuai kemampuan dan keinginan sehingga video dapat dijadikan berbagai sarana yang vital dalam berbagai media promosi. Oleh karena itu, penulis mengembangkan sebuah film dokumenter yang berjudul “Film Dokumenter Pembayaran Kaul Dengan Bulu Geles di Desa Tambakan”. Dengan dikembangkannya film dokumenter ini, diharapkan keberadaan tradisi Pembayaran Kaul Dengan Bulu Geles di Desa Tambakan semakin di kenal, serta dapat dijadikan sebuah media pembelajaran baik dari segi proses dan makna di balik sebuah tradisi Pembayaran Kaul Dengan Bulu Geles yang berada di Desa Tambakan. Hasil akhir film dokumenter Pembayaran Kaul Dengan Bulu Geles di Desa Tambakan dapat memberikan wawasan bagi penonton terkait tradisi Pembayaran Kaul Dengan Bulu Geles di Desa Tambakan. Respon pengguna terhadap film dokumenter Pembayaran Kaul Dengan Bulu Geles dapat dikategorikan sangat positif. Kata Kunci : Bulu Geles, Film Dokumenter, Tradisi. The oral tradition is one form of cultural expression of the region whose numbers hundreds throughout Indonesia. Payment tradition vows with Bulu Geles is a promise or debt payment by using a male calves as ingredients. The purpose of this study was to: (1) implement Documentary Payments vows With Bulu Geles in Tambakan village. (2) Determine the user response to the Documentary Payments vows With Bulu Geles in Tambakan village. The method used in the Documentary Payments vows With Bulu Geles in Tambakan village using cyclic strategy. This application is implemented using Sony Vegas Pro 13.0 as a video maker. Utilization maker application video of the impact of technological advances led to the teenagers or young child is able to be creative in the process the video with various effects according to ability and desire so that video can be used as the means vital in a variety of media promotion. Therefore, the authors developed a documentary titled "Documentary Payments vows With Bulu Geles in Tambakan village". With the development of this documentary, expected presence Payment tradition vows with Bulu Geles in Tambakan village increasingly well known, and can be used as a medium of learning in terms of both the process and the meaning behind the tradition Payment vows with Bulu Geles in Tambakan village. The final result documentary Payment vows With Bulu Geles in Tambakan village can provide insight for the audience related payments tradition vows With Bulu Geles in the village. User response to the documentary film payment vows With Bulu Geles can be categorized as very positive. keyword : Bulu Geles, Documentary, Tradition.
REJECTION CHARACTERISTICS OF ORGANOCHLORINE PESTICIDES BY LOW PRESSURE REVERSE OSMOSIS MEMBRANE Utami, Woro Nastiti; Iqbal, Rofiq; Wenten, I Gede
Jurnal Air Indonesia Vol. 6 No. 2 (2010): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.863 KB) | DOI: 10.29122/jai.v6i2.2460

Abstract

The  increased  use  of  pesticides  has  led  to many  benefits  such  as  advanced  productivity and lower maintenance costs  in agriculture. On the other hand, their  adverse  effects  have  also  grown : an increase of  the risks to the ecosystem and human health. Pressure driven technique such as reverse osmosis and nanofiltration have the potentiality to remove hazardous organic micropollutants such as pesticides. The rejection characteristic of artificial water with 10 ppb concentration of endosulfan and organochlorine pesticides from upper Citarum water shed sample were investigated with a commercial low pressure reverse osmosis unit on laboratory scale. Rejection and flux were measured with a varied operational parameters ; pH, pressure, and feed concentration. Endosulfan rejection was achieved > 80% with all varied operational parameters. There was a little dependence permeate flux and percent of rejection on pH. An increasing pressure caused a higher permeate flux while there was no effect of an increasing pressure to higher percentage of endosulfan rejection. An increasing feed concentration caused a lower permeate flux due to an increasing osmotic pressure.  An increasing feed concentration also result in an increasing percent of endosulfan rejection. Organochlorine pesticides found in river water sample which are lindane, aldrin, and heptachlor were all rejected 100%. This may be caused by natural organic matter present in river water and hydrophobicity. Percent rejection was constant to pressure and pH variation. Keywords : Low Pressure Reverse Osmosis, Organochlorine Pesticides, Pressure, pH, Feed Concentration
REJECTION CHARACTERISTICS OF ORGANOCHLORINE PESTICIDES BY LOW PRESSURE REVERSE OSMOSIS MEMBRANE Utami, Woro Nastiti; Iqbal, Rofiq; Wenten, I Gede
Jurnal Air Indonesia Vol. 6 No. 2 (2010): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jai.v6i2.2460

Abstract

The  increased  use  of  pesticides  has  led  to many  benefits  such  as  advanced  productivity and lower maintenance costs  in agriculture. On the other hand, their  adverse  effects  have  also  grown : an increase of  the risks to the ecosystem and human health. Pressure driven technique such as reverse osmosis and nanofiltration have the potentiality to remove hazardous organic micropollutants such as pesticides. The rejection characteristic of artificial water with 10 ppb concentration of endosulfan and organochlorine pesticides from upper Citarum water shed sample were investigated with a commercial low pressure reverse osmosis unit on laboratory scale. Rejection and flux were measured with a varied operational parameters ; pH, pressure, and feed concentration. Endosulfan rejection was achieved > 80% with all varied operational parameters. There was a little dependence permeate flux and percent of rejection on pH. An increasing pressure caused a higher permeate flux while there was no effect of an increasing pressure to higher percentage of endosulfan rejection. An increasing feed concentration caused a lower permeate flux due to an increasing osmotic pressure.  An increasing feed concentration also result in an increasing percent of endosulfan rejection. Organochlorine pesticides found in river water sample which are lindane, aldrin, and heptachlor were all rejected 100%. This may be caused by natural organic matter present in river water and hydrophobicity. Percent rejection was constant to pressure and pH variation. Keywords : Low Pressure Reverse Osmosis, Organochlorine Pesticides, Pressure, pH, Feed Concentration
Non Dispersive Chemical Deacidification of Crude Palm Oil in Hollow Fiber Membrane Contactor Mubiar Purwasasmita; Eryk Bone Pratama Nabu; K. Khoiruddin; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 47 No. 4 (2015)
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.2015.47.4.6

Abstract

Performance of chemical deacidification of crude palm oil (CPO) using aqueous NaOH solution in a polysulfone hollow fiber ultrafiltration membrane was  investigated. The effects of operating temperature, NaOH concentration and flow rates on percentage of free fatty acids (FFA) removal, oil loss, soap entrainment and overall mass transfer coefficient  were  evaluated. Overall mass transfer coefficients, soap content in oil and neutral oil loss all increased  when the  temperature  was increased from 60 to 70°C due to an increase of the FFA distribution value. A minimum 0.25 N of NaOH or a NaOH to FFA  molar ratio  of about 7.62 was  required to facilitate the expected extraction efficiency. The increased oil flowrate slightly enhanced the solute transport kinetics,  while the  aqueous phase flowrate did not significantly influence deacidification efficiency or mass transfer coefficient. About 97% of FFA removal was achieved within 4 hours. The maximum oil loss observed was 11% and the highest  soap content in the  oil without separation step was 3150 ppm. The values  of the  overall mass transfer coefficient varied  from 2.97×10-7 to 7.71×10-7 m/s. These results show the potential of using the non dispersive membrane contacting process for chemical deacidification of CPO as well as other vegetable oils.
Co-Authors Ahmad Nurul Hakim Anita K. Wardani Anita K. Wardani Anita K. Wardani, Anita K. Anita Kusuma Wardani Aysha Mareta Karlina Danu Ariono Danu Ariono Danu Ariono Danu Ariono Darmawan, Hanna Enny Ratnaningsih Eryk Bone Pratama Nabu Eryk Bone Pratama Nabu, Eryk Bone Pratama Firmansyah, Rizky W. Hanna Darmawan I Gede Mahendra Darmawiguna I Made Ardwi Pradnyana I Nyoman Widiasa I.N. Widiasa Julian, Helen Kadja, Grandprix Thomryes Marth Khoiruddin Khoiruddin Khoiruddin, K Lienda Aliwarga Lienda Aliwarga Mubiar Purwasasmita Mubiar Purwasasmita Mubiar Purwasasmita Mubiar Purwasasmita Nengsi Rova Nicholaus Prasetya Novika Suwardana Nurul F. Himma P.T.P. Aryanti P.T.P. Aryanti, P.T.P. Petrus Benny Juwono PUJI LESTARI Purwasasmita, Mubiar Putu T.P. Aryanti Putu T.P. Aryanti Putu Teta P. Aryanti Putu Teta Prihartini Aryanti Rofiq Iqbal S. Subagjo S. Subagjo Setyo Widodo Shelli R. Joscarita Shelli R. Joscarita, Shelli R. Suwardana, Novika TATI NURHAYATI Utami, Woro Nastiti Wardani, Anita Kusuma Yulanda, Nanda