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All Journal JURNAL KIMIA SAINS DAN APLIKASI Eksergi: Chemical Engineering Journal Indonesian Journal of Science and Technology Konversi Info-Teknik EnviroScienteae Communications in Science and Technology Jurnal Teknik Kimia dan Lingkungan JURNAL REKAYASA KIMIA & LINGKUNGAN
Meilana Dharma Putra
Department Of Chemical Engineering, Lambung Mangkurat University
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Interlayer-free Membran Silika Pektin untuk Pervaporasi Air Rawa Asin Erdina Lulu Atika Rampun; Muthia Elma; Isna Syauqiah; Meilana Dharma Putra; Aulia Rahma; Amalia Enggar Pratiwi
Jurnal Kimia Sains dan Aplikasi Vol 22, No 3 (2019): Volume 22 Issue 3 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2440.738 KB) | DOI: 10.14710/jksa.22.3.99-104

Abstract

Wetland in South Kalimantan is one of surface water sources to provide clean water. However, seawater intrusion has spread into the wetland aquifer and reduce the quality of water. Silica-pectin membrane is a promising technology for desalination. The membranes were tested for desalination by pervaporation at room temperature (~25 °C). During pervaporation process, the water contacts to membrane and the separation is started to occurs as vapour phase by maintaining vacuum pressure (~1 bar). The permeate was collected in the cold trap after condensed using nitrogen liquid. The purpose of this research was to investigate the performance of interlayer-free silica pectin membrane for wetland saline water. Experimental results shows the fluxes of membrane are 0.35 and 0.19 kg.m-2 h-1 ( pectin 0%wt); 0.23 and 0.16 kg.m-2 h-1 (pectin 0.1%wt); 0.58 and 3.63 kg.m-2 h-1 (pectin 0.5%wt); 3.40 and 0.12 kg.m-2 h-1 (pectin 2.5%wt) calcined at 300 and 400 °C, respectively. Natural organic matter (NOM) and salt concentration in wetland saline water can reduce the fluxes up to (~98%). Nevertheless, overall salt rejection of membranes achieved >99%. It was found that low calcination gives better performance at high pectin concentration. While pectin concentration was limited at high calcination.
Kinetic Study of Co-pyrolysis of Kelakai (Stenochlaena palustris) and Low-rank Coal (Lignite) Fadhillah, Hilda Nur; Wijayanti, Hesti; Mardina, Primata; Juwita, Rinna; Nata, Iryanti Fatyasari; Putra, Meilana Dharma; Madani, Zikri Daffa Aulia; Hendrawan, Rangga Dwi
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7195

Abstract

Recently, fossil fuels have still become a main source of energy and chemicals. Biomass conversion has become a promising technology to convert biomass into bio-energy and bio-chemicals. Kelakai, as a potential biomass, is abundant in wetland areas such as Kalimantan (Indonesia) and many other Asian regions, so that low-rank coal (lignite). Co-pyrolysis, the combined pyrolysis of biomass and lignite, is an attractive technique considering to its potential to enhance the efficiency of pyrolysis products. In this study, the thermal decomposition behavior and kinetic of co-pyrolysis of kelakai and lignite at various mass ratio composition (1:0, 3:1, 1:1, 1:3, and 0:1) were investigated. The experiments were performed on a thermogravimetric analyzer (TGA). The TGA result indicated that the kelakai highly decomposed at 257-400℃, while lignite was 286-500℃. Their blends were in between. In addition, thermogravimetric data were subsequently applied to a kinetic analysis based on the Arrhenius equation, with a first-order reaction. The kinetic analysis results, including activation energy and pre-exponential factor, were determined for the kelakai and lignite mixture were found to be in the range of 10.22-10.98 kJ/mol and 0.0651-0.1351 min-1, respectively. Knowledge of thermal decomposition characteristics of kelakai and its kinetics is essential for optimizing pyrolysis design. The co-pyrolysis kelakai and lignite resulted in the highest bio-oil yield of  26.86 wt% at the ratio of  0:1 and the lowest yield of 12.51 wt% for the ratio of 1:0, when using mixed ratios of kelakai and lignite, the highest yield was 24.60% (1:3) and the lowest yield was 21.18 wt% (1:1).
Biopolymer of Chitosan from Fish Scales as Natural Coagulant for IronContaminated Groundwater Treatment Irawan, Chairul; Nata, Iryanti Fatyasari; Putra, Meilana Dharma; Marisa, Rosmasari; Asnia, Mira; Arifin, Yulian Firmana
Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 2 (2018): Jurnal Rekayasa Kimia & Lingkungan (December, 2018)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v13i2.10601

Abstract

Chitosan, the de-acetylated chitin derivative, was evaluated for its ability to be used as a natural coagulant for Martapura groundwater treatment. This study is used chitosan derived from original fish scales of Kalimantan called Papuyu (Anabas testudineus) for the treatment of iron ion-containing Martapura groundwater through coagulation-flocculation method. The reduction efficiency of iron ion removed by coagulation-flocculation processes using chitosan from Papuyu fish scales is the primary evaluating parameter. The obtained chitosan have been characterized and analyzed by Fourier transforms infrared spectroscopy (FTIR), X-ray Fluroscence (XRF) and Scanning electron microscopy (SEM). Using of the chitosan from Papuyu fish scales as coagulant at neutral pH and room temperature led to decreasing the groundwater iron concentration become 3.43 mg/L (around 71% removal). The result was then compare to the coagulation-flocculation treatment using the commercial chitosan from shrimps shell (93% deacetylated). Moreover, its found the coagulation-flocculation treatment using the chitosan from fish scales as coagulant more favor than the commercial one.
Insight into Aluminum Leaching with Microwave from Peat Clay: A Comparative Kinetic Study of SC and BIC Models Mirwan, Agus; Hairullah; Jelita, Rinny; Jefriadi; Putra, Meilana Dharma; Ilmanto, Bintang Hambela; Putri, Hexas Sarastiwi Handayani; Ulum, Muhammad Bahrul; Haka, Muhammad Rofi; Darmawan, Muhammad Arif
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1850

Abstract

The depletion of bauxite reserves has prompted the research of various types of soil as alternative sources of aluminum, such as the peat clay used in this study. The complexity of the minerals requires a more efficient leaching methods, while microwave-based leaching offers a potential approach through rapid and uniform heating. This study examines the effect of microwave power, HCl concentration, operating temperature, and particle size on the leaching efficiency of aluminum from peat clay soil. The leaching process was modeled using two approaches, namely the shrinking core (SC) model and the broken-intact cell (BIC) model under pseudo-steady state conditions. The results showed that increasing HCl concentration, microwave power, and temperature accelerated leaching, while increasing particle size decreased leaching efficiency. Optimum conditions were achieved at 4 M HCl concentration, 100 W power, 40 °C temperature, and 0.0074 cm particle size. The shrinking core (SC) model showed better fit under most conditions, while the intact-broken cell (BIC) model was more accurate at lower temperatures and particle sizes. The simulation results showed that the most suitable parameter values in the SC model were De = 0.0049 cm2/s, k = 10.5 cm/s, and kc = 2.49 cm/s, while in the BIC model De = 0.04808 cm2/s and K = 0.02689 g/cm3 were obtained. These results confirm the superiority of the SC model in representing microwave-based leaching mechanisms in general, while the BIC model provides additional insights under diffusion-limited conditions. Process Performance Index (PPI) analysis showed that optimum conditions were achieved at 4 M HCl and 40 °C, but lower acid concentrations also yielded competitive PPI. This confirms that leaching effectiveness is determined by a combination of alumina recovery and reagent consumption efficiency. These findings contribute to the development of leaching kinetics models and the optimization of more efficient and energy-saving aluminum extraction processes.
Comparative Study of Soxhlet Extraction and Hydraulic Pressing for Biokerosene Production from Rubber Seeds (Hevea brasiliensis) Indah Retno Wulandary; Abubakar Tuhuloula; Meilana Dharma Putra; Dewi Dheana Herman; Anisa Maghfirah; Marliana Hartania; Nur Ainah
Eksergi Vol 23 No 2 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i2.16489

Abstract

Biokerosene is a renewable alternative to fossil-based kerosene, derived from biological resources such as rubber seeds. This study evaluates the effects of Soxhlet extraction and hydraulic pressing on biokerosene production, including the influence of stirring speed during degumming and the physicochemical characteristics of the product. Rubber seed masses of 50, 75, and 100 g were tested, with degumming conducted at 150 and 300 rpm. The highest oil yield (46%) was obtained using Soxhlet extraction at 50 g. However, superior product quality was achieved through hydraulic pressing at 75 g and 150 rpm, yielding the lowest free fatty acid (FFA) value (4.47 mg KOH/g) and the highest proportion of C10–C16 hydrocarbons (56.54%). The resulting biokerosene exhibited densities of 913.8–929.4 kg/m³ and viscosities of 2.6–3.6 cSt. These findings indicate that Soxhlet extraction is more effective for maximizing yield, while hydraulic pressing produces higher quality intermediates that are better suited for downstream upgrading into aviation fuel.
Co-Authors Abubakar Tuhuloula Agung Nugroho Agus Mirwan Agus Mirwan Amalia Enggar Pratiwi Anisa Maghfirah Asnia, Mira Aulia Rahma Chairul Irawan Dewi Dheana Herman Erdina Lulu Atika Rampun Erisa Maya Safitri Erisa Maya Safitri, Erisa Maya Fadhillah, Hilda Nur Gusti Safriana Safitrie H Gusti Safriana Safitrie H, Gusti Safriana Hairullah Haka, Muhammad Rofi Hendrawan, Rangga Dwi Hesti Wijayanti Hesty Heryani Hikmah Hikmah Hilda Nur Fadhillah Ilmanto, Bintang Hambela Indah Retno Wulandary Iryanti Fatyasari Nata, Iryanti Fatyasari Isna Syauqiah Jefriadi Jefriadi Jefriadi Lini Ingriyani Lini Ingriyani, Lini Madani, Zikri Daffa Aulia Marisa, Rosmasari Marliana Hartania Meda Nur Anisa Mira Asnia Misnawati Misnawati Muhammad Arif Darmawan Muhammad Bahrul Ulum Muhammad Jauhar Mahdi Muthia Elma Noor Ridha Yanti Nur Ainah Primata Mardina Putri, Hexas Sarastiwi Handayani Rifatus Saufiyah Rifatus Saufiyah, Rifatus Rinna Juwita Rinny Jelita Rinny Jelita, Rinny Rosmasari Marisa Sylvera Bella Priscilla Yulian Firmana Arifin