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Resti Nurmala Dewi
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Jurusan Teknik Kimia Universitas Syiah Kuala, Jl. Tgk. Syech Abdur Rauf No.7, Kopelma Darussalam, Banda Aceh, INDONESIA
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JURNAL REKAYASA KIMIA & LINGKUNGAN
Published by Universitas Syiah Kuala
ISSN : 14125064     EISSN : 23561661     DOI : https://doi.org/10.23955/rkl.v18i2.34018
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Engineering
The Journal of Chemical Engineering and Environment is an open access journal that publishes papers on chemical engineering and environmental engineering. The following topics are included in these sciences: Food and biochemical engineering Catalytic reaction engineering Clean energy technology Environmental and safety technology Fundamentals of chemical engineering and applied industrial engineering Industrial chemical engineering Material science engineering Process and control engineering Polymer and petrochemical technology Membrane technology Agro-industrial technology Separation and purification technology Environmental modelling Environmental and information sciences Water and waste water treatment and management Material flow analysis Mechanisms of clean development
Arjuna Subject : Teknik Kimia (semua kategori) - Bioengineering
Articles 319 Documents
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Heavy Metal Adsorption Using Cellulose Xanthate from Sugarcane Bagasse: A Fixed-Bed Column Study Iryani, Dewi Agustina; Permadi, Sigit; Astuti, Widi; Sumardi, Slamet; Taharuddin, Taharuddin
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.38058

Abstract

In recent years, various environmentally friendly adsorbents have been developed to address the removal of heavy metals from industrial wastewater. This study focuses on the adsorption of lead (Pb) and copper (Cu) using cellulose xanthate derived from sugarcane bagasse as an adsorbent. The adsorption experiments were conducted in a fixed-bed column with dimensions of 2.4 cm in diameter and 8 cm in height. Atomic Absorption Spectrophotometry (AAS) was used to analyze the concentrations of Pb and Cu before and after adsorption, while the adsorbent composition was characterized using X-Ray Fluorescence (XRF). The breakthrough times for Pb and Cu adsorption was found to be 8 and 6 minutes, respectively, with total adsorption durations of 18.584 and 17.543 minutes. The Thomas Model was employed to evaluate the kinetics and adsorption capacity, yielding kinetic constants (KTH) of 0.00283 and 0.0006 mL/mg.min for Pb and Cu, respectively, and adsorption capacities (qeq) of 712.89 and 181.18 mg/g. These results provide valuable insights into the adsorbents efficiency, kinetics, and potential applications in environmental remediation and wastewater treatment.
Techno-Economic Analysis of Electricity Generation From Rice Husk Based On Demand For Electric Vehicle: A Case Study In Surabaya City, Indonesia Muthia, Rahma; Putro, Muhamad Rifan Aji Wahyudi
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.36924

Abstract

On August 5, 2019, the President of the Republic of Indonesia issued a Presidential Regulation (Perpres) concerning the acceleration of the battery-based electric motorized vehicle program for road transportation. However, fossil energy sources such as coal, oil and natural gas used in conventional power plants are increasingly limited, so alternative energy that is more sustainable and environmentally friendly is needed. One source of sustainable electrical energy is biomass wastes such as rice husks, which have a potential CO2emission reduction of 142,610.51 tCO2/year. The method used for technical analysis by simulating the process of processing biomass waste into electrical energy using the gasification process with Aspen Plus software as a tool to obtain optimum operating conditions. Biomass with flow 32,906.9 kg/h is fed into the gasification process area and then produces 1,538 kmol/h of syngas which reacted with airflow 9,779 kmol/h. The selling target for electric products is to supply the electricity needs of electric vehicle users in Surabaya. This research is possible to do with the consideration that East Java is the province with the largest rice production in Indonesia, Surabaya is a metropolitan city and is the economic center of the province of East Java so it is possible to developments related to the infrastructure of electric vehicles and the electric vehicle itself. Based on the economic feasibility analysis, the biomass power plant has an NPV of Rp.163 million, an IRR is 15.01%, WACC 7.34%, LCOE 4.063 Rupiah/kWh and a payback period of 6 years.
Acetylation of Glycerol Catalyzed by CaO as Octane Booster in Gasoline Fuel Nugraheni, Ika Kusuma; Sokheh, Sahidin; Artika, Kurnia Dwi
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.45159

Abstract

Glycerol, a byproduct of biodiesel production, can be transformed into value-added compounds such as triacetin, which serves as an effective octane booster in gasoline. This study investigates the acetylation of glycerol with acetic acid using calcium oxide (CaO) as a heterogeneous catalyst. Catalyst concentrations of 1%, 2.5%, 5%, 7.5%, and 10% were tested under reaction conditions of 100C for 180 minutes. The resulting products were analyzed using gas chromatographymass spectrometry (GC-MS) to identify acetylated derivatives. Among the tested conditions, 5% CaO yielded the highest triacetin content. The acetylated product was then blended into gasoline at a 5% concentration. Fuel testing showed an increase in the Research Octane Number (RON) from 84 (pure gasoline) to 93 with the addition of triacetin, along with slight increases in fuel density and viscosity. These findings highlight the potential of CaO-catalyzed glycerol acetylation for producing high-performance fuel additives.
Green Synthesis of Silver Nanoparticles Using Caulerpa racemosa Extract as Bioreductor: Characterization and Antibacterial Activity Barleany, Dhena Ria; Selviroh, Selviroh; Saleh, Afiatta Ilhan; Pitaloka, Alia Badra; Gunawan, Akbar
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.45873

Abstract

Silver nanoparticles (AgNPs) have attracted much attention due to their broad antimicrobial properties and have found many applications in various fields. In the current study, AgNPs were synthesized using an environmentally friendly method by utilizing Caulerpa racemosa extract as a bioreduction agent. This study aims to investigate the formation of AgNPs mediated by Caulerpa racemosa extract and to observe their antimicrobial capability. The concentration of silver nitrate (AgNO3) was varied to investigate its influence on the shape, size, and uniformity of the silver particles formed. The Fourier Transform Infra-red (FT-IR) test results revealed that Caulerpa racemosa extract has an (-OH) functional group that reduces Ag+ ions to Ag0, making it effective as a bioreductor for AgNPs synthesis. The shape and size of AgNPs were examined using Scanning Electron Microscope (SEM), and the results confirmed that increasing AgNO concentration from 5 to 20 mM produced larger and agglomerated particles. Additionally, AgNPs inhibitory effect on the growth of pathogenic Escherechia coli (gram-negative bacteria) was evaluated using the well diffusion method. The findings showed that AgNPs improved the antibacterial properties when incorporated into chitosan-based film solution. This indicates that AgNPs exhibit strong antibacterial activity against gram-negative bacteria and hold promises for use in bio-related applications, including food packaging and biomedical uses
Comparative Evaluation of Poly Aluminum Chloride (PAC) and Aluminum Chlorohydrate (ACH) in Pre Treatment of Boiler Feed Water Antika, Fitria Mega; Saputra, Asep Handaya
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.42378

Abstract

Industrial boiler feed water from rivers and groundwater requires treatment to remove impurities causing scaling and corrosion. In this study, water treatment was carried out using the coagulationflocculation method with Poly Aluminum Chloride (PAC) and Aluminum Chlorohydrate (ACH) as coagulants, with the aim of comparing their performance and cost-effectiveness. Jar tests were performed with coagulant dosages of 40, 60, and 80 ppm and rapid mixing speeds of 90, 120, and 150 rpm. Metal reduction experiments were conducted by adding Fe and Cu at concentrations of 1, 3, and 5 ppm. The results showed that the optimum dosages for turbidity and metal removal were 80 ppm for PAC and 40 ppm for ACH, while the optimum dosages for COD reduction were 60 ppm for PAC and 40 ppm for ACH. Rapid mixing at 90 rpm was most effective for turbidity reduction, whereas 120 rpm was optimal for metal and COD removal. Overall, ACH was found to be more effective and more cost-efficient than PAC for the pretreatment of boiler feed water
Optimization of Operating Conditions for the Extraction of Natural Dyes, from the Peel of Djenkol (Pithecellobium Jiringa) Using the Response Surface Methodology (RSM) Method and Behnken Design (BBD) Experimental Design Utami, Herti; Marlina, Arlin; Azizah, Ara Annastasya; Nurhidayat, Adib
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.45536

Abstract

Natural dyes are generally contained in plant parts such as twigs, stems, peel, flowers, fruits, and roots. Djenkol peel is one of the wastes that has the potential to be used as a natural dye. The extraction of natural dyes from djenkol peel is carried out using Ultrasonic Assisted Extraction. Optimization was carried out using the Response Surface Methodology (RSM) with an experimental design of Box Behnken Design (BBD) which aimed to determine the influence of three research variables (solid to liquid ratio, time, and extraction temperature) on the yield response of the obtained natural dye extract. Based on the optimization that has been carried out, an optimal solution was obtained with an optimal %yield result from the natural dye extract of djenkol peel of 25.285% with variations of solid to liquid ratio, temperature, and extraction time respectively of 0.079 g/ml, 59.979 oC, and 89.998 minutes. The results of the UV-Vis spectrophotometry test showed a wave peak at 300 nm with an absorbance value of 4.88, the GC-MS test showed that tannin are the dominant compounds contained in djenkol peel extract.
Effect of Corn Cob Cofiring Ratio Variation on Flue Gas Emissions in a 350 MW Coal-Fired Power Plant Pujiyatmoko, Erwin; Karamah, Eva Fathul
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.46158

Abstract

Coal-fired power plants are major contributors to greenhouse gas (GHG) emissions in Indonesia, particularly carbon dioxide (CO2), sulfur dioxide (SO2), and nitrogen oxides (NOx). This study analyzes the effect of varying corn cob biomass co-firing ratios on emission levels and thermal performance in a 350 MW subcritical coal-fired unit. Real operational data were obtained from both 100% coal combustion and a 5% corn cob co-firing field test, which were then used to calibrate an Aspen Plus V14 simulation model for higher biomass blending scenarios at 10% and 15%. Results show that increasing the biomass ratio reduces CO2 emissions from 307.44 T/h to 261.33 T/h and NOx from 215.03 to 158.15 mg/Nm, due to biomasss lower carbon and nitrogen content. In contrast, SO2 emissions increased from 206.54 to 310.05 mg/Nm at 15% co-firing, likely due to the biomass sulfur content and altered combustion behavior. Thermal efficiency declined as Specific Fuel Consumption (SFC) rose from 0.638 to 0.753 kg/kWh and Net Plant Heat Rate (NPHR) from 3191.25 to 3766.76 kCal/kWh, mainly due to the lower calorific value and higher moisture content of biomass. Although the Basic Production Cost (BPP) increased from Rp 583.80/kWh to Rp 663.48/kWh, it remains below national residential tariffs, ensuring profitability. The findings suggest that corn cob co-firing up to 15% is technically and economically viable, with potential to support Indonesias energy transition and emission reduction goals if supported by appropriate operational and policy frameworks.
Analysis of Greenhouse Gas Emission Calculations Based on the Corrected IPCC Method at Coal-fired Power Plant Tuwaluyo, Edward Putra; Slamet, S.
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.45615

Abstract

Greenhouse gas (GHG) emissions from coal-fired power plants, including carbon dioxide (CO), methane (CH), and nitrous oxide (NO), significantly contribute to climate change. The 2300 MW coal-fired power plant (PLTU) in Java, Indonesia, plays a key role in national energy supply but also generates substantial emissions. This study conducts GHG inventory and emissions analysis using the corrected IPCC method (Tier-1, Tier-2, and Tier-3) and evaluates mitigation strategies in fuel usage, waste management, and transportation. The IPCC methodology categorizes Tier-1 as using default emission factors, Tier-2 incorporating country-specific factors, and Tier-3 using direct measurements and real-time data. Meanwhile, Method-1, Method-2, and Method-3 reflect different correction levels for emission factors and fuel oxidation, with Method-3 (Tier-3) being the most accurate. Total GHG emissions from 20212023 reached 14,413,328 tons COe, with fuel usage as the dominant contributor (14,413,302 tons COe). Method-3 Tier-3 resulted in 11,006,815 tons COe, 11.89% lower than Methode-2 Tier-2 (11,018,851.21 tons COe) and Method-1 Tier-1 (12,492,384 tons COe). High-calorific coal (4,397 Kcal/kg) reduced emissions per energy unit, while biomass co-firing (2.7% in 2023) requires expansion for further reductions. Biodiesel is more effective than CN48 diesel in cutting emissions, aligning with its carbon-neutral classification in the 2018 ESDM GHG Inventory Guidelines. This study recommends optimizing coal calorific value, increasing biomass co-firing, and transitioning to biodiesel to reduce GHG emissions in coal-fired power plants, supporting carbon trading and national mitigation policies.
Microencapsulation of Watermelon Rind Extract (Citrullus Lanatus) Using Maltodextrin and Gum Arabic as a Food Supplement Applications Kusumaningrum, Maharani; Imani, Nadya Alfa Cahaya; Permanadewi, Indrasukma; Ardhiansyah, Hanif; Handayani, Dwi; Situmorang, Monatalia Lamtama; Rizkiyana, Luthfi; Audyaz-Zahra, Chealsy Zafarina; Indriawati, Aisya Eka
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.45954

Abstract

The food and beverage sector generates a large amount of organic waste, one of which is watermelon rind. Although it contains bioactive compounds such as lycopene, vitamin C, and phenolic compounds with antioxidant properties, watermelon rind is often discarded due to the rapid degradation of these compounds by light and temperature. This study proposes a solution to the aforementioned issue: the microencapsulation of watermelon rind (Citrullus lanatus) extract obtained through maceration. The process utilizes maltodextrin and gum arabic as coating materials and employs oven drying at temperatures of 45C, 50C, and 55C. The DPPH method evaluated strong antioxidant activity with an IC50 value of 70 ppm. Principal component analysis showed the content of Ethyl isoallocholate (31.80%), 5-Hydroxymethylfurfural (7.25%), 7,8-Epoxylanostan-11-ol, 3-acetoxy- (6.10%), and 2,4-Dihydroxy-2,5-dimethyl-3(2H)-furan-3-one (4.04%), where Ethyl isoallocholate inhibited DPPH radicals by 88%. The optimal formulation was achieved with an extract:solvent ratio of 20:80 and a maltodextrin and gum arabic ratio of 1:0, at 50C, yielding 81.161%. The microcapsules formed showed a spherical morphology, a smooth surface and showed small micro-cracks, and an average diameter between 20-80 m. Formulation with maltodextrin and gom arabic ratio of 3:4 at 55C produced the highest solubility (99.92%) and the lowest moisture content (0.97%). This study shows that microencapsulation is able to protect active compounds from degradation and has the potential to become a quality food supplement from natural ingredients, as well as supporting the reduction of organic waste and environmentalpreservation.

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