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All Journal Indonesian Journal of Chemistry Jurnal Teknik Kimia Indonesia Multidiciplinary Output Research for Actual and International Issue (Morfai Journal) Makara Journal of Technology
Sutrasno Kartohardjono
Chemical Engineering Department, Faculty Of Engineering, University Of Indonesia, Depok 16424, Indonesia
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Combination of ozonation and absorption through membrane contactor to remove ammonia from waste water Sutrasno Kartohardjono; Milasari Herdiana Putri; Setijo Bismo
Jurnal Teknik Kimia Indonesia Vol 11, No 2 (2012)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2012.11.2.3

Abstract

Ammonia in waste water is a major pollutant produced in industrial and agricultural waste water. Ammonia is often removed by conventional technologies such as pack tower aeration, biological treatment or adsorption as ammonium ion onto zeolites. In many cases, conventional methods are very costly and inefficient, and therefore, there is a need for an alternative separation technique for more efficient removal of ammonia from waste waters. The aim of this study is to investigate the performance of the combination of ozonation and absorption through membrane processes to remove ammonia from wastewater using natural hot spring water (NHSW) as absorbent. Experimental results show that operating variables such as time and pH of absorbent solution are found to remarkably influence the removal process efficiency. Based on experimental results ozonation can improve ammonia removal efficiency through the hollow fiber membrane contactor. Ammonia removal efficiencies and overall mass transfer coefficients increase with decreasing pH of absorbent solution. Keywords: ammonia, mass transfer, membrane, ozonation, removal efficiencyAbstrak Amonia di dalam air limbah merupakan polutan utama yang berasal dari air limbah industri dan pertanian. Amonia kebanyak disisihkan dengan teknologi konvensional seperti aerasi di menara isian, pengolahan secara biologi atau penyerapan sebagai ion amonium pada zeolit. Dalam banyak hal, metode konvensional sangat mahal dan kurang efisien, sehingga diperlukan teknik separasi alternatif untuk proses penyisihan amonia dari air limbah yang lebih efisien. Tujuan dari studi ini adalah untuk menyelidiki kinerja kombinasi proses ozonasi dan proses absorbsi melalui membran untuk menyisihkan amonia dari air limbah menggunakan absorben berbahan dasar air dari sumber air panas. Hasil eksperimen memperlihatkan bahwa variabel operasi, seperti waktu dan pH larutan penyerap, sangat mempengaruhi efisiensi proses penyisihan amonia. Berdasarkan hasil eksperimen, ozonasi dapat meningkatkan efisiensi penyisihan ammonia melalui kontaktor membran serat berlubang. Efisiensi penyisihan amonia dan koefisien perpindahan massa keseluruhan naik dengan turunnya pH larutan penyerap.Kata kunci: amonia, perpindahan massa, membran, ozonasi, efisiensi penyisihan
CO2 Absorption from Its Mixture with CH4 or N2 through Hollow Fiber Membrane Contactor using Water as Solvent Kartohardjono, Sutrasno; Anggara, Anggara; Subihi, Subihi; Yuliusman, Yuliusman
Makara Journal of Technology Vol. 11, No. 2
Publisher : UI Scholars Hub

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Abstract

CO2 Absorption from Its Mixture with CH4 or N2 through Hollow Fiber Membrane Contactor using Water as Solvent. Hollow fiber membrane contactors have been widely used as gas-liquid contactors recently such as in the CO2 absorption process from gas stream. This research aims to evaluate the effectiveness of hollow fiber membrane contactor to absorb CO2 from its mixture with CH4 or N2 using water through mass transfer and hydrodynamic tests. There are 3 membrane modules used in this research with shell diameter of 1.9 cm, length of 40 cm, outer fiber diameter of 2.7 mm and fiber number in the contactors of 10, 15 and 20. Liquid flow rates in the hollow fiber membrane contactors are varied in this research. Research results show that mass transfer coefficients in the membrane contactor increase with increasing liquid flow rate and decrease with increasing fiber number in the contactor. Flux of CO2 into water can achieve 1.4x10-9 mol CO2 /m2.s and mass transfer coefficients can achieve 1.23 x 10-7 m/s. Meanwhile, hydrodynamic test results show that water pressure drop in the membrane contactors increase with increasing fiber number in the contactors.
Performance of Hollow Fiber Membrane Gas-Liquid Contactors to Absorb CO2 Using Diethanolamine (Dea) as a Solvent Kartohardjono, Sutrasno; Nata, Pan Ade; Prasetio, Eko; Yuliusman, Yuliusman
Makara Journal of Technology Vol. 13, No. 2
Publisher : UI Scholars Hub

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Abstract

This study uses DEA solution to absorb CO2 from the gas flow through the hollow fiber membrane contactors. This study aims to evaluate the performance of hollow fiber membrane contactors to absorb CO2 gas using DEA solution as solvent through mass transfer and hydrodynamics studies. The use of DEA solution is to reduce the mass transfer resistance in the liquid phase, and on the other side, the large contact area of the membrane surface can cover the disadvantage of membrane contactors; additional mass transfer resistance in the membrane phase. During experiments, CO2 feed flows through the fiber lumens, while the 0.01 M DEA solution flows in the shell side of membrane contactors. Experimental results show that the mass transfer coefficients and fluxes of CO2 increase with an increase in both water and DEA solution flow rates. Increasing the amount of fibers in the contactors will decrease the mass transfer and fluxes at the same DEA solution flow rate. Mass transfer coefficients and CO2 fluxes using DEA solution can achieve 28,000 and 7.6 million times greater than using water as solvent, respectively. Hydrodynamics studies show that the liquid pressure drops in the contactors increase with increasing liquid flow rate and number of fibers in the contactors. The friction between water and the fibers in the contactor was more pronounced at lower velocities, and therefore, the value of the friction factor is also higher at lower velocities.
Innovative High-Speed Homogenizer Approach for Synthesizing PVDF-GO Membranes from Recycled Battery Graphite Febriasari, Arifina; Ferdiansyah, Ferry; Salsabila, Shafa Marwa; Ridwan, Muhammad; Mahardika, Muhammad Bagas Adhistya; Hilyati, Hilyati; Sudjarwo, Wisnu Arfian Anditya; Arlofa, Nina; Supriyadi, Supriyadi; Toca-Herrera, Jose Luis; Kartohardjono, Sutrasno
Indonesian Journal of Chemistry Vol 25, No 5 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.103909

Abstract

Effective waste management is essential for achieving a zero-waste environment, particularly in handling hazardous domestic waste like used dry cell batteries. This study explores a sustainable approach by recovering graphite from battery waste to synthesize graphene oxide (GO) for enhancing poly-vinylidene fluoride (PVDF) membranes. GO was synthesized using the Hummers method and a modified high-speed homogenization approach, then characterized via Raman spectroscopy and X-ray diffraction (XRD). The fabricated PVDF-GO membranes were further analyzed using SEM-EDS, AFM, water contact angle measurements, and bacterial rejection tests. Results confirmed successful GO synthesis and integration into the polymer matrix. GO incorporation improved hydrophilicity, reducing the water contact angle from 120° (pure PVDF) to 66° and 56° in PVDF/PVP-GO membranes via high-speed homogenization and conventional methods, respectively. The modified membranes exhibited a 5–6 times larger pore size than pure PVDF and achieved nearly 100% bacterial rejection. Additionally, PVDF/PVP-GO(h) showed a 91.76% faster production time efficiency than PVDF/PVP-GO(s).
TECHNO-ECONOMIC ANALYSIS OF THE NATURAL GAS PIPELINE CONSTRUCTION AND REFINING PROCESS FROM GREATER SUNRISE OFFSHORE TO NATARBORA ONSHORE, TIMOR-LESTE Francisco Manuel Gusmao; Sutrasno Kartohardjono
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 6 No. 4 (2026): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.21886162

Abstract

The Greater Sunrise gas field, with a production capacity of 750 MMSCFD, is a strategic energy source for Timor-Leste. Its development is planned through an offshore refining facility and a 250 km pipeline to Natarbora, requiring comprehensive technical and economic studies. Technically, gas purification is carried out to remove CO₂, H₂S, heavy hydrocarbons, and water vapor to prevent corrosion, hydrate formation, and equipment damage during transportation. The processes used include a three-phase separator, acid gas separation (Acid Gas Removal Unit, AGRU), heavy hydrocarbon separation (Dew Point Control Unit, DPCU), and a water separation unit. Simulation results show that the gas is dominated by 85.1% methane, with the AGRU able to reduce CO₂ from 0.05 to 0.02, resulting in a marketable gas of 724.4 MMSCFD. At the DPCU with a flow rate of approximately 723 MMSCFD, it produces 11 barrels/day of condensate, and the dehydration process produces 723 MMSCFD of dry gas. Economically, a 24-inch diameter pipe was chosen as the most optimal option with a compressor requirement of 5 units. The total CAPEX of the project is 3,337 million USD with OPEX of 51 million USD, including the cost of the pipe, vessel installation, compressor, platform, and gas purification facilities. Based on the results of the gas price sensitivity calculation of 4-10 USD/MMBTU, the project is not feasible at a price of 4-5 USD/MMBTU, which is indicated by a negative NPV, IRR of 2-9%, and a Payback Period of 10-17 years. The project begins to be feasible at a price of 6 USD/MMBTU with an NPV of 1040 million USD, an IRR of 16%, and a Payback Period of 4 years. Furthermore, at a price of 7-10 USD/MMBTU, economic performance improves significantly, with an NPV of up to 6102 million USD, an IRR of up to 47%, and a shorter payback period of 1-3 years. At a gas price of around 7 USD/MMBTU, the project is declared economically feasible and prospective.
Co-Authors Alfi Maghfirwan Ramadhan, Alfi Ananda Putra Sangaji, Ananda Anggara Anggara Anggara Anggara, Anggara Arlofa, Nina Eko Prasetio Eko Prasetio, Eko Febriasari, Arifina Ferry Ferdiansyah, Ferry Francisco Manuel Gusmao Hilyati Hilyati Kezia Elkardiana, Kezia M. Iwan Fermi Mahardika, Muhammad Bagas Adhistya Milasari Herdiana Putri Muhammad Ridwan Nata, Pan Ade Pan Nata Pan Nata, Pan Salsabila, Shafa Marwa Setijo Bismo Subihi Subihi Subihi Subihi, Subihi Sudjarwo, Wisnu Arfian Anditya Supriyadi Supriyadi Toca-Herrera, Jose Luis Yuliusman Yuliusman Yuliusman Yuliusman