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All Journal Jurnal Teknologi Lingkungan Universitas Trisakti JOURNAL OF COASTAL DEVELOPMENT Reaktor KARMAPATI (Kumpulan Artikel Mahasiswa Pendidikan Teknik Informatika) ISSN: 2252-9063 JURNAL AIR INDONESIA Journal of Engineering and Technological Sciences International Journal of Engineering and Emerging Technology ASEAN Journal of Chemical Engineering Jurnal Teknik Kimia Indonesia Journal of Engineering and Technological Sciences
I Gede Wenten
Program Studi Teknik Kimia, Institut Teknologi Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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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
Penggunaan limbah tempe dalam biodegradasi zat warna azo menggunakan bioreaktor membran aerob-anaerob Putri Sri Komala; Agus Jatnika Effendi; IG Wenten; W Wisjnuprapto
Jurnal Teknik Kimia Indonesia Vol 8, No 3 (2009)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2009.8.3.5

Abstract

Tempeh waste is a form of waste that still has an economic value, due to its relatively high organic and nutrient content compared to yeast extract. In this research, tempeh waste was used as a co-substrate for the removal of azo dye from textile industry effluent using an aerobic-anaerobic membrane bioreactor. The bioreactor consists of a modified activated sludge process, i.e. a contact-stabilization process coupled with anoxic reactor and combined with an external ultrafiltration membrane to replace the sedimentation process in conventional activated sludge process. The feed consists of Remazol Black-5 azo dye at a concentration of 110-120 mg/L, and tempeh waste as an organic and nutrient source at 8-10% v/v concentration. An experiment was done to measure the effect of hydraulic retention time on dye removal, by varying the HRT in the contact tank at 1, 1.5, 2, 2.5, and 3 hours, and that of  stabilization- and anoxic tanks kept constant at 4 and 3 hours. From the experiment a 41-51% removal of the dye and 46-65% removal of organic compounds were obtained. The highest dye and organic compound removal was obtained at a contact HRT of 2 hours, namely 51% of dye removal and 65% of organic removal efficiencies. An auto-oxidation process occurs in the contact tank, resulting in an increase in the dye concentration.Keywords: tempeh waste, membrane bioreactor, Hydraulic Retention Time (HRT), contact tank, azo dye. Abstrak Limbah tempe merupakan salah satu limbah yang masih memiliki nilai ekonomis, karena kandungan senyawa organik dan nutrien yang terdapat didalamnya masih relatif tinggi jika dibandingkan dengan yeast extract. Dalam penelitian ini limbah tempe digunakan sebagai ko-substrat untuk penyisihan zat warna azo dari industri tekstil dengan menggunakan bioreaktor membran aerob-anaerob. Bioreaktor terdiri dari modifikasi proses lumpur aktif yaitu proses kontak-stabilisasi yang dihubungkan dengan reaktor anoksik dan dikombinasikan dengan membran ultrafiltrasi secara eksternal. Umpan terdiri dari zat warna azo Remazol Black-5 pada konsentrasi 110-120 mg/L dan limbah tempe sebagai sumber organik dan nutrien dengan konsentrasi 8-10% v/v. Percobaan dilakukan untuk mengamati pengaruh waktu retensi hidrolik (hydraulic retention time, HRT) tangki kontak terhadap penyisihan warna dengan variasi HRT tangki kontak antara 1, 1½, 2, 2½ dan 3 jam, sedangkan tangki stabilisasi dan anoksik pada HRT konstan 4 dan 3 jam. Dari percobaan dihasilkan penyisihan warna berkisar antara 41-51% dan penyisihan senyawa organik antara 46-65%. Baik penyisihan warna maupun senyawa organik terbesar dihasilkan pada HRT kontak 2 jam yaitu 51% untuk penyisihan warna dan 65% untuk penyisihan senyawa organik. Pada tangki kontak terjadi autoksidasi yang menyebabkan kenaikan konsentrasi warna.Kata Kunci: limbah tempe, bioreaktor membran, waktu retensi hidrolik (HRT), tangki kontak, zat warna azo.
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.
Investigation of Electrochemical and Morphological Properties of Mixed Matrix Polysulfone-Silica Anion Exchange Membrane Khoiruddin Khoiruddin; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 48 No. 1 (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.2016.48.1.1

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 P.T.P. Aryanti; Shelli R. Joscarita; Anita K. Wardani; S. Subagjo; Danu Ariono; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 48 No. 2 (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.2016.48.2.1

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 Danu Ariono; Mubiar Purwasasmita; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 48 No. 4 (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.2016.48.4.1

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 Danu Ariono; Putu Teta P. Aryanti; Anita Kusuma Wardani; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 50 No. 2 (2018)
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.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 Lienda Aliwarga; Setyo Widodo; Novika Suwardana; Hanna Darmawan; Khoiruddin Khoiruddin; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 51 No. 2 (2019)
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.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°.
Long-Term Performance of a Pilot Scale Combined Chemical Precipitation-Ultrafiltration Technique for Waste Brine Regeneration at Chevron Steam Flooding Plant I Gede Wenten; Khoiruddin Khoiruddin; Ahmad Nurul Hakim; Putu T.P. Aryanti; Nengsi Rova
Journal of Engineering and Technological Sciences Vol. 52 No. 4 (2020)
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.2020.52.4.4

Abstract

In this work, chemical precipitation-ultrafiltration (UF) was applied for waste brine regeneration from a steam flooding plant at Duri Field, Chevron. A mixture of sodium hydroxide and sodium carbonate solution was used as chemical agent. A polypropylene (PP) UF membrane was used to remove precipitate formed in the chemical precipitation. It was found that the combined process could be used to regenerate waste brine, removing up to 100% (±0.1) of calcium and up to 99.6% (±0.3) of magnesium. High hardness removal was achieved when the chemical dosage was 1.3 to 1.7 mole of chemical/mole of hardness. Rapid permeability decline was observed in the UF membrane due to the high turbidity and TSS values of the chemically treated waste brine. Backwash with an acid solution could recover the UF membrane's permeability effectively. However, pH adjustment is needed due to the high pH value of the UF permeate (up to ~12).
Membrane Oxygenator for Extracorporeal Blood Oxygenation Enny Ratnaningsih; Putu T.P. Aryanti; Nurul F. Himma; Anita K. Wardani; K. Khoiruddin; Grandprix T.M. Kadja; Nicholaus Prasetya; I Gede Wenten
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (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.2021.53.5.2

Abstract

Extracorporeal blood oxygenation has become an alternative to supply O2 and remove CO2 from the bloodstream, especially when mechanical ventilation provides insufficient oxygenation. The use of a membrane oxygenator offers the advantage of lower airway pressure than a mechanical ventilator to deliver oxygen to the patient’s blood. However, research and development are still needed to find appropriate membrane materials, module configuration, and to optimize hydrodynamic conditions for achieving high efficient gas transfer and excellent biocompatibility of the membrane oxygenator. This review aims to provide a comprehensive description of the basic principle of the membrane oxygenator and its development. It also discusses the role and challenges in the use of membrane oxygenators for extracorporeal oxygenation on respiratory and cardiac failure patients.
Co-Authors A K Wardani Agus Jatnika Effendi Ahmad Nurul Hakim Anak Agung Istri Agung Sri Komaladewi Ananthi, Naraina Anita K. Wardani Anita K. Wardani Anita K. Wardani, Anita K. Aysha Mareta Karlina Budiyono Budiyono D Ariono 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. H. Susanto Hanna Darmawan Heru Susanto I Gede Mahendra Darmawiguna I Made Ardwi Pradnyana I Nyoman Widiasa I Wayan Surata I. N. Widiasa I.N. Widiasa I.N. Widiasa Julian, Helen Kadja, Grandprix Thomryes Marth Khoiruddin Khoiruddin Khoiruddin, K Lienda Aliwarga Lienda Aliwarga Lingganingrum, F.S. Mubiar Purwasasmita Mubiar Purwasasmita Mubiar Purwasasmita Mubiar Purwasasmita N. Aryanti Nengsi Rova Nicholaus Prasetya Novika Suwardana Nurul F. Himma P T P Aryanti P.T.P. Aryanti P.T.P. Aryanti, P.T.P. Petrus Benny Juwono PTP Aryanti PUJI LESTARI Purwasasmita, Mubiar Puti Sri Komala Putri Sri Komala 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. Siagian, Utjok Welo Risma Siti Helmyati Sutrisna, P.D. Suwardana, Novika T. Setiadi TATI NURHAYATI Utami, Woro Nastiti W Wisjnuprapto Wardani, Anita Kusuma Wisjnuprapto Wisjnuprapto Wisjnuprapto, Wisjnuprapto Y. Bindar Yulanda, Nanda