Garuda - Garba Rujukan Digital

p-Index From 2021 - 2026

0.947

P-Index

This Author published in this journals

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

Author-ID : 414022

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

Published : 36 Documents Claim Missing Document

Claim Missing Document

Articles

1 2 3 4

FRESH WATER PRODUCTION IN COASTAL AND REMOTE AREAS BY SOLAR POWERED LIQUID-LIQUID MEMBRANE CONTACTOR Heru Susanto; I G. Wenten
JOURNAL OF COASTAL DEVELOPMENT Vol 6, No 3 (2003): Volume 6, Number 3, Year 2003
Publisher : JOURNAL OF COASTAL DEVELOPMENT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (607.864 KB)

Liquid-liquid membrane contactor (LLMC) is a new desalination process using microporous hydrophobic membrane. The temperature difference at two solution-membrane interfaces gives rise to a trans membrane vapor pressure difference that drives the flux. In this work, the effect of process parameters on LLMC performance has been done. The process parameters consist of feed and permeate temperatures, cross flow velocity, feed concentration and mode of operation. In addition, this paper focuses on the development of LLMC by using solar and wind as energy sources. In this experiments micro porous hydrophobic hollow fiber polypropylene membrane with 0,2 mm was used as a contacting device. The experiment were conducted at temperature of 25-80oC, cross flow velocity of 0.02-0.2 m/s and solute concentration of 0-110.000 mg/L. Results show that the flux was influenced by the feed and permeate temperatures, the cross flow velocity and the concentration of solute. The increase of feed temperature increases the flux exponentially, whereas the flux seems to increase linearly with the increase of cross flow velocity. On the other hand, the flux was not significantly affected by the solute concentration. Furthermore, the flux in the counter current mode was lower than in the co-current mode. The average pure water fluxes obtained were in the range of 2-3 l/(m2h), whereas the products concentrations were in the range of 2-5.3 mg/L depending on the feed concentration. The operation of solar powered LLMC up to 10 days shows a very stable performance.

Aktivitas Mikroba Lumpur Aktif Konsentrasi Tinggi Pada Sistem Lumpur Aktif- Membran Budiyono Budiyono; T. Setiadi; I. G. Wenten
Reaktor Volume 07 No. 1 Juni 2003
Publisher : Dept. of Chemical Engineering, Diponegoro University

Pengolahan air limbah dengan sistem kombinasi proses lumpur aktif dengan membrane telah banyak dimanfaatkan di beberapa negara maju. Sistem ini diketahui mampu beroperasi dengan konsentrasi lumpur aktif (MLSS, Mixed Liquor Suspended Solid) sangat tinggi sehingga menghasilkan sistem yang kompak dengan efisiensi pengolahan tinggi. Penelitian ini mengkaji aktifitas mikroba yang terlibat dalam sistem. Aktifitas yang dikaji antara lain laju pemanfaatan oksigen spesifik (SOUR, specific oxygen uptake rate), parameter kinetika, serta laju pemanfaatan nitrogen dan fosfor.Proses pengolahan berjalan pada konsentrasi MLSS jauh di atas proses lumpur aktif konvensional, yaitu berturut-turut 18.400, 22.900, 24.300, dan 25.500 mg/l. Untuk mendapatkan konsentrasi MLSS tersebut, proses pengolahan beroperasi pada waktu tinggal cairan (HRT, hydraulic retention yime) 24 jam dan waktu tinggal sel (SRT, solid retention time) 8, 16, 24, dan 32 hari. Hasil penelitian menunjukkan bahwa mikroorganisme yang terlibat pada proses ini ditandai oleh mikroorganisme yang mempunyai laju pertumbuhan sangat lambat. Parameter kinetika yang diperoleh sebagai berikut: laju pertumbuhan maksimum spesifik (μmax) 0,024 jam-1, koefisien perolehan sel (Y) 0,515 (mg sel/ mg COD), konstanta setengah jenuh (Ks) 589 mg/l, dan laju kematian spesifik (b) 0,010 jam-1. Dengan semakin tinggi konsentrasi lumpur aktif, maka aktifitas mikroba akan semakin kecil. SOUR yang diperoleh untuk SRT 8,16,2 dan 32 hari berturut-turut sebesar 0,612; 0,357; 0,279; 0,207 gO2 / (gMLSS.hari). bila ditinjau dari segi operasionalisasi unit pengolahan limbah, maka proses pengolahan lumpur aktif – membran jauh lebih menghemat kebutuhan nitrogen dan fosfor untuk nutrient.Kata kunci : aktifitas mikroba, sistem lumpur aktif-membran, SOUR

Bioreaktor Membran untuk Reaksi Enzimatik Penisilin G I.G. Wenten; I.N. Widiasa
Reaktor Volume 3 No.1 Desember 1999
Publisher : Dept. of Chemical Engineering, Diponegoro University

Bioreaksi kontinyu telah diketahui sebagai suatu cara efisien untuk diaplikasikan pada industri. Pada penelitian ini, dua jenis bioreaktor (suatu reaktor enzim yang dilengkapi dengan membran filtrasi aliran melintang bioreaktor dengan serat berongga) digunakan untuk menghidrolisis Penisilin G secara kontinyu. Percobaan menggunakan dua membran komersial, yaitu mikrofiltrasi dengan ukuran pori 0,2 µm dari x-flow dan ultrafiltrasi dengan BM 30.000 dari DDSS. Selanjutnya suatu model empiris dikembangkan untuk menggambarkan dinamika fluks pada ultrafiltrasi. Hasil percobaan menunjukkan bahwa membran ultrafiltrasi memberikan rejeksi yang lebih tinggi (15 LMH) dan rejeksi yang lebih tinggi (99,2%) dicapai dengan membran ultrafiltrasi. Secara umum, konversi yang dicapai berada pada kisaran 22 – 99 %, dan ini lebih rendah dari sistem batch. Konversi substrat yang tinggi sangat penting untuk menurunkan kehilangan substrat dan menurunkan biaya proses. Pada sistem bioreaktor dengan serat berongga, hal ini dapat dilakukan dengan menurunkan kecepatan fluks dan mempengaruhi waktu tinggal substrat. Kecepatan fluks yang rendah juga penting untuk menghindari pembentukan gel pada permukaan membran. Kata kunci : reaktor enzim, mikrofiltrasi, ultrafiltrasi, penisilin G

COMBINATION OF REVERSE OSMOSIS AND ELECTRODEIONIZATION FOR SIMULTANEOUS SUGAR RECOVERY AND SALTS REMOVAL FROM SUGARY WASTEWATER I.N. Widiasa; I Gede Wenten
Reaktor Volume 11, Nomor 2, Desember 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

An integrated membrane system combining reverse osmosis (RO) and electrodeionization (EDI) is used for simultaneous sugar concentration and salts removal from a synthetic dilute sugar solution as a model of sugar-containing wastewater. The RO system uses a thin film composite RO membrane (Saehan CSM, RE1812-60). Meanwhile, the EDI stack has two diluted compartments, one concentrated compartment, one anode compartment, and one cathode compartment. Commercially available cation exchange membrane (MC-3470) and anion exchange membrane (MA-3475) are used as ionic selective barriers of the EDI stack. Both diluate and concentrate compartments are filled with mixed ion exchange resins (purolite strong acid cation exchange, C-100E and strong base type I anion resins, A-400). Two different operation modes, i.e. RO-EDI and EDI-RO, were assessed. The experimental results show that the observed sugar rejection of RO membrane is more than 99.9% and there is no sugar loss in the EDI stack. This indicates that the hybrid process allows almost total sugar recovery. In addition, significant reduction of salts content from the concentrated sugar solution is obtained. From permeate flux and permeate purity points of view, however, the EDI-RO configuration seems superior to the RO-EDI configuration. It should be emphasized that scale formation on the membrane surface of the concentrate compartment side has to be controlled.

PERFORMANCE OF NEWLY CONFIGURED SUBMERGED MEMBRANE BIOREACTOR FOR AEROBIC INDUSTRIAL WASTEWATER TREATMENT I Gede Wenten
Reaktor Volume 12, Nomor 3, Juni 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

The application of membrane to replace secondary clarifier of conventional activated sludge, known as membrane bioreactor, has led to a small footprint size of treatment with excellent effluent quality. The use of MBR eliminates almost all disadvantages encountered in conventional wastewater treatment plant such as low biomass concentration and washout of fine suspended solids. However, fouling remains as a main drawback. To minimize membrane fouling, a new configuration of submerged membrane bioreactor for aerobic industrial wastewater treatment has been developed. For the new configuration, a bed of porous particle is applied to cover the submerged ends-free mounted ultrafiltration membrane. Membrane performance was assessed based on flux productivity and selectivity. By using tapioca wastewater containing high organic matter as feed solution, reasonably high and stable fluxes around 11 l/m2.h were achieved with COD removal efficiency of more than 99%. The fouling analysis also shows that the newly configured ends-free membrane bioreactor exhibits lower irreversible resistance compared with the submerged one. In addition, the performance of pilot scale system, using a membrane module with 10 m2 effective area and reactor tank with 120 L volume, was also assessed. The flux achieved from the pilot scale system around 8 l/m2.h with COD removal of more than 99%. Hence, this study has demonstrated the feasibility of the newly configured submerged ends-free MBR at larger scale.

Pemekatan gliserol dengan reserve osmosis I. N. Widiasa; Wisjnuprapto Wisjnuprapto; I. G. Wenten
Reaktor Volume 6 No. 1 Juni 2002
Publisher : Dept. of Chemical Engineering, Diponegoro University

Pemisahan enzim dan pemekatan produk masih menjadi kendala utama dalam aplikasi proses hidrolisis minyak/lemak secara enzimatis untuk skala industry. Dalam makalah ini akan dipaparkan kemungkinan proses reserve osmosis tekanan rendah untuk roses pemekatan larutan gliserol. Tiga tipe membrane reserve osmosis yang tersedia di pasaran dari Millipore, yakni R-15A (poliamida), R-25A (poliamida), dan R-45P (polisulfon tersulfonasi), telah digunakan. Hasil yang diperoleh menunjukkan bahwa fluks permeat meningkat secara linear terhadap tekanan operasi. Selain itu, tekanan operasi juga meningkatkan selektivitas umpan. Secara umum, membrane R-15A memberikan selektivitas yang lebih baik dibandingkan dengan membrane R-25A dan membrane R-45P, tetapi memberikan fluks yang lebih rendah. Untuk umpan dengan konsentrasi gliserol kurang dari 60.000 ppm, membrane R-25A lebih direkomendasikan karena memberikan fluks lebih dari 40% fluks air murni dan rejeksi masih di atas 85%. Prningkatan nilai Cm dan k terhadap kenaikan operasi menunjukkan bahwa kondisi percobaan masih di daerah kendali tekanan. Kata kunci : hidrolisis minyak, pemekatan gliserol, reserve osmosis

Experimental And Mathematical Modeling Studies Of Liquid-Liquid Membrane Contactor H. Susanto; I. G. Wenten
Reaktor Volume 5 No.2 Desember 2001
Publisher : Dept. of Chemical Engineering, Diponegoro University

Experimental and modeling studies of the effect of tempetarature on liquid-liquid membrane contactor (LLMC) have been done. The experiments were conducted by varying temperature of 25 up to 80 0C, cross flow velocity from 0.02 to 0.05 m/s and feed concentration of 0, 5000 and 30,000 mg/l. In these experiments microporous hydrophobic hollow fiber polypropylene membrane with 0.2 μm was used as a contacting device. The modeling has been done by compiling mathematic equation of mass and heat transfers in liquid-liquid membrane contactor. Both the experimental and modeling result show, the increase in feed temperature increase the flux of pure water exponentially, whereas the flux decrease with increasing the permeate temperature. The feed temperature increase at higher temperature result in hogher flux increase. The concentration of pure water result in the range of 1.8 to 5.6 mg/l depending on feed concentration.Keywords : membrane contactor, modeling

Two Dimentional Numerical Models Of Hollow Fiber Membrane Contactor N. Aryanti; Y. Bindar; I. G. Wenten
Reaktor Volume 6 No. 2 Desember 2002
Publisher : Dept. of Chemical Engineering, Diponegoro University

Membrane contactor is separation processing unit using membrane as a contacting device. The major advantage of membrane contactor relies on its high contact area compared to conventional scrubber. One of the important applications of membrane contactor is to reduce emission of acid gases. In this work, modeling of membrane contactor is conductedto describe concentration distribution along fiber length used to predict effective fiber length by solving mass conservation equation. Solving of mass conservation equation required information of fluid flow distribution obtained by solving continuity and momentum equation simultaneously. The finite volume method is used to obtain the solution. Modeling of fluid flow was carried out by adding Darcy`s and Brinkman-Darcy flow models into Navier-Stokes equation. The momentum and continuity equation are solved for two-dimentional cylindrical coordinate. The result of velocity profile at axial direction were validated with Pangrle et.al. (1992) experimental data. The comparison shows that consideration using Brinkman-Darcy flow model give agood agreement with experimental data in which maximal axial velocity achieved is 0,047 m/s for this model and 0,05 m/s for experimental data.the concentration profile at radial direction using Darcy and Brickman-Darcy flow models have also been investigated. Furthermore, concentration profile at axial direction using the both two flow models indicate a decrease of concentration along fiber length. The comparison between models and experimental data by Subhakti and Azmier (1997) agree very closely to the Brinkman- Darcy flow model. The prediction of effective fiber length was conducted based on minimum economical flux oe\f membrane contactor. The calculation gives the effective fiber length obtained is 0.19 m at gas concentration, gas flow rate, and sorbent concentration of 0.02 mol/L, 0.8 m/s and 0.256 M respectively.Keywords : modeling, membrane contactor, Darcy, Brinkman-Darcy

NON-DISSOLVED SOLIDS REMOVAL DURING PALM KERNEL OIL ULTRAFILTRATION Mubiar Purwasasmita; Petrus Benny Juwono; Aysha Mareta Karlina; Khoiruddin Khoiruddin; I Gede Wenten
Reaktor Volume 14, No. 4, OKTOBER 2013
Publisher : Dept. of Chemical Engineering, Diponegoro University

Performance of polypropylene hollow fiber ultrafiltration membrane during non-dissolved solids (NDS) removal from palm kernel oil is investigated. The filtration is operated at difference feed temperature and pressure to study the effect of both parameters on membrane performance. From the experimental results, it can be concluded that polypropylene hydrophobic hollow fiber membrane can be used for palm kernel oil NDS removal. Temperature and trans-membrane pressure have proportional effect to permeate flux. In contrast, they have inverse effect to rejection of NDS. During the experiment, permeate fluxes and rejections of NDS varied from 3.4 to 8.7 L/m2.h and from 51% to 94%, respectively. The best operating conditions suggested are feed temperature of 30°C and TMP of 1 bar which produce the highest NDS rejection. In addition, the permeate quality can meet the requirement of standard NDS content even at its lowest rejection level which shows the remarkable performance of membrane filtration.

SACCHARIFICATION OF NATIVE CASSAVA STARCH AT HIGH DRY SOLIDS IN AN ENZYMATIC MEMBRANE REACTOR I Nyoman Widiasa; I Gede Wenten
Reaktor Volume 12, Nomor 3, Juni 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

This study is aimed to develop a novel process scheme for hydrolysis of native cassava starch at high dry solids using an enzymatic membrane reactor (EMR). Firstly, liquefied cassava starch having solids content up to 50% by weight was prepared by three stage liquefactions in a conventional equipment using a commercially available heat stable a-amylase (Termamyl 120L). The liquefied cassava starch was further saccharified in an EMR using glucoamylase (AMG E). By using the developed process scheme, a highly clear hydrolysate with dextrose equivalent (DE) approximately 97 could be produced, provided the increase of solution viscosity during the liquefaction was precisely controlled. The excessive space time could result in reduction in conversion degree of starch. Moreover, a residence time distribution study confirmed that the EMR could be modelled as a simple continuous stirred tank reactor (CSTR). Using Lineweaver-Burk analysis, the apparent Michaelis-Menten constant (Km) and glucose production rate constant (k2) were 552 (g/l) and 4.04 (min-1), respectively. Application of simple CSTR model with those kinetic parameters was quietly appropriate to predict the reactor’s performance at low space time.

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

Title

Found 36 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 36 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 36 Documents
Search