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All Journal IPTEK The Journal of Engineering
Ardista Izdhihar Kaloka
Institut Teknologi Sepuluh Nopember
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Mechanical Engineering

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Effect of Flow Rate NaOH on CO2 Absorption Efficiency Using a Column Tray Absorber Rizal Arifin; Nurul Faizah; Ardista Izdhihar Kaloka; Anisa Fatma Aulia; Gladys Sukma Thufailah; Muhammad Adnan Syukur
IPTEK The Journal of Engineering Vol. 11 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v11i1.a22713

Abstract

CO2 in industrial gas streams reduces process efficiency, corrodes equipment, and affects product quality. Additionally, CO2 emissions contribute to climate change and global warming. To mitigate these effects, CO2 removal through absorption is essential. Absorption involves contacting a gas mixture with a liquid absorbent to dissolve the gas component. This study examines the effect of CO2 flow rate (V) and NaOH flow rate (L) on CO2 absorption efficiency. The experiment involved preparing 33 liters of 0.1 normal NaOH and 250 milliliters of 0.1 normal HCl, followed by solution standardization using methyl orange. CO2 was introduced through valve V-4 while NaOH was pumped into the absorption column. Samples were taken after steady state was reached, and titration with 0.1 normal HCl determined residual NaOH concentration. Flow rate variations of 1, 3, 5, 7, and 9 liters per minute were tested. Results align with literature, indicating that as CO2 flow rate increases, NaOH flow rate also rises. However, the L/V ratio and absorbed CO2 amount decrease due to reduced contact time, lowering absorption efficiency. This study highlights the importance of optimizing flow rates to enhance CO2 capture.
Application of Electrocoagulation in Stabilizing pH and Removing Pollutants from Domestic and Urban Wastewater Using Aluminum Electrodes Ardista Izdhihar Kaloka; Nurul Faizah; Rizal Arifin; Anisa Fatma Aulia; Muhammad Benaldo Anugrah Putra; Ni’mah Wati; Icha Nur Prayadi
IPTEK The Journal of Engineering Vol. 11 No. 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v11i2.a22816

Abstract

This study investigates the application of electrocoagulation using aluminum electrodes to stabilize pH and remove pollutants from various real wastewater sources in Surabaya, Indonesia, including laundromats, fast food restaurants, campus canteens, mechanical workshops, and tofu industries. A batch-mode electrocoagulation process was conducted using 10 A of current over 60 minutes, and the performance was evaluated based on pH changes, turbidity, and Total Suspended Solids (TSS) removal. The highest TSS removal efficiency of 98% was observed in machine shop wastewater, while laundromat samples also achieved high performance with 97% reduction. Electrocoagulation demonstrated strong pH stability in effluents with buffering compounds such as those from campus canteens and workshops, whereas fluctuating pH and turbidity levels were found in tofu and fast-food effluents, indicating the need for process optimization. Turbidity decreased significantly across all samples, confirming effective floc formation during electrolysis. The findings confirm that electrocoagulation is a promising method for treating both domestic and urban wastewater. However, integrating additional processes such as adsorption or filtration is recommended to enhance performance for complex wastewater compositions and ensure compliance with discharge standards.
Effect of Inhibitor Addition, pH, and Current Density on the Corrosion Rate of Fe Metals Anisa Fatma Aulia; Nurul Faizah; Rizal Arifin; Ardista Izdhihar Kaloka; Gladys Sukma Thufailah
IPTEK The Journal of Engineering Vol. 11 No. 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v11i2.a22948

Abstract

Corrosion significantly impacts public safety and the economy, causing substantial financial losses, infrastructure damage, and hazardous incidents across various industries. Researchers investigated the effects of pH, current density, and corrosion inhibitors (potassium chromate and potassium nitrate) on iron corrosion by measuring weight loss of iron samples immersed in sulfuric acid over time. The addition of inhibitors showed that KNO3 was more effective in reducing the corrosion rate, with values of 4.992068, 3.744051, 2.736034, 1.728017, and 0.608008 mils per year, compared to K2CrO4, which resulted in 9.728132, 7.296099, 5.472066, 3.648033, and 1.216017 mils per year. Corrosion rate increased as pH decreased, with Fe showing corrosion at pH 6.21, 5.18, 4.26, 3.85, and 3.22. The relationship between current density and corrosion rate was found to be proportional, with voltage values of 1.31, 2.24, 3.16, 5.11, and 7.1 amperes per square meter (A/m^2). This study confirms that inhibitor type, acidity (pH), and current density significantly influence corrosion behavior, where increasing pH and current density can accelerate corrosion, and potassium nitrate (KNO3) demonstrates superior corrosion inhibition compared to potassium chromate (K2CrO4).
Impact of Rotational Speed and Oxygen Flow Rate on Homogeneity and Fluid Flow Patterns Using a CFD-Based Side Entry Mixer in the Aeration Process Danawati Hari Prajitno; Ardista Izdhihar Kaloka; Hikmal Akbar H; Nuriya Shifa A; Vania Salma Fuadiyah; Happy Riezqya Dzunnurain
IPTEK The Journal of Engineering Vol. 12 No. 1 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j28075064.v12i1.9680

Abstract

Mixing is an essential operation in many industrial processes to ensure uniform material distribution and enhance mass transfer. A side-entry mixer (SEM) is widely used in large storage tanks because it provides effective circulation with lower installation and maintenance costs than conventional top-entry mixers. This study investigated the effects of impeller rotational speed and oxygen flow rate on the homogeneity and flow patterns of a calcium carbonate (CaCO₃)–water suspension during the aeration process. Computational Fluid Dynamics (CFD) simulations using ANSYS and experimental visualization were employed to evaluate mixing performance. The operating conditions included impeller rotational speeds of 500, 600, 800, 1000, and 1200 rpm and oxygen flow rates of 5, 10, 15, 20, and 25 L/s. The results showed that increasing rotational speed and oxygen flow rate accelerated mixing and improved fluid homogeneity. The flow was dominated by axial and combined axial–radial patterns, promoting uniform circulation throughout the tank. Under the investigated conditions, the best mixing performance was achieved at 1200 rpm with oxygen flow rates of 20 and 25 L/s, reaching complete mixing within 40 s. Higher Reynolds and Sherwood numbers at these conditions also indicated enhanced turbulent mixing and mass transfer.
Impact of Rotational Speed and Impeller Types on Flow Patterns and Mixing Time in a Side-Entry Dual Mixer: A Study Using CFD and Visual Methods Ardista Izdhihar Kaloka; Shendi Haris Firmansyah; Marsyada Maghfirotul Wafiroh; Ni’mah Wati; Icha Nur Prayadi; Danawati Hari Prajitno
IPTEK The Journal of Engineering Vol. 12 No. 1 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j28075064.v12i1.9682

Abstract

The effectiveness of industrial mixing processes is strongly influenced by impeller type and rotational speed because these parameters determine flow pattern, turbulence intensity, and fluid homogeneity. This study analyzes the effect of impeller type and rotational speed on flow pattern, mixing time, and turbulence characteristics in a side-entry dual mixer using a calcium carbonate (CaCO₃) suspension and water. The analysis was conducted using computational fluid dynamics (CFD) modeling and visual observation to identify circulation patterns and stagnant zones. Three impeller configurations were evaluated: dual four-blade propellers, four-blade pitched blade turbines (4-PBT), and a combination of both, operated at 300 and 600 rpm. The results show that impeller type significantly influences the flow pattern, while increasing rotational speed reduces mixing time. The dual 4-PBT at 600 rpm provided the best performance, characterized by multiple axial–radial circulation loops without stagnant zones and the fastest mixing time of 120 s. This configuration also produced the highest Reynolds number of 3127.19, indicating a transitional flow regime that enhances turbulence and accelerates homogenization. These results demonstrate the importance of selecting appropriate impeller types and rotational speeds to improve industrial mixing efficiency.
Co-Authors Anisa Fatma Aulia Danawati Hari Prajitno Gladys Sukma Thufailah Happy Riezqya Dzunnurain Hikmal Akbar H Icha Nur Prayadi Icha Nur Prayadi Marsyada Maghfirotul Wafiroh Muhammad Adnan Syukur Muhammad Benaldo Anugrah Putra Ni’mah Wati Ni’mah Wati Nuriya Shifa A Nurul Faizah Rizal Arifin Shendi Haris Firmansyah Vania Salma Fuadiyah