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All Journal IPTEK The Journal of Engineering JURNAL NASIONAL TEKNIK ELEKTRO Turbo : Jurnal Program Studi Teknik Mesin SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan JISIP: Jurnal Ilmu Sosial dan Pendidikan Pilar Teknologi : Jurnal Penelitian Ilmu-ilmu Teknik International Journal of Community Service International Journal Artificial Intelligent and Informatics Indonesian Community Journal SinarFe7 Makara Journal of Science Sewagati AutoMech : Jurnal Teknik Mesin Jurnal Inovasi dan Pengembangan Hasil Pengabdian Masyarakat Jurnal Polimesin Journal of Engineering and Technological Sciences Educommunity Jurnal Pengabdian Masyarakat Jurnal Abdimas Dosma Qiyas : Jurnal Hukum Islam dan Peradilan
Arifin, Rizal
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Application of Electrocoagulation in Stabilizing pH and Removing Pollutants from Domestic and Urban Wastewater Using Aluminum Electrodes Kaloka, Ardista Izdhihar; Faizah, Nurul; Arifin, Rizal; Aulia, Anisa Fatma; Putra, Muhammad Benaldo Anugrah; Wati, Ni’mah; Prayadi, Icha Nur
IPTEK The Journal of Engineering Vol. 11 No. 2 (2025)
Publisher : Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember.

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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 Aulia, Anisa Fatma; Faizah, Nurul; Arifin, Rizal; Kaloka, Ardista Izdhihar; Thufailah, Gladys Sukma
IPTEK The Journal of Engineering Vol. 11 No. 2 (2025)
Publisher : Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember.

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

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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.
Effect of a sugar palm fiber and pineapple leaf fiber reinforcement in a polyester matrix on flexural strength and macrostructural characteristics Putra, Wawan Trisnadi; Arifin, Rizal; Winangun, Kuntang; Fadelan, Fadelan; Saputra, Rangga Ardana
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.7772

Abstract

The utilization of natural fiber-based composites has emerged as a promising alternative to synthetic materials because of their lightweight, high strength, and eco-friendly characteristics. This research investigates the influence of combining sugar palm fiber and pineapple leaf fiber on the flexural strength and macrostructural characteristics of polyester-matrix composites. Specimens were fabricated using the hand lay-up press technique, while flexural strength testing followed the ASTM D-790 standard. Macrostructural analysis was performed using a macro lens to evaluate fiber distribution, void presence, and delamination. The results confirmed that fiber composition significantly affected both mechanical and structural properties. Among all specimens, the pineapple-fiber-dominant composite (Specimen 5) achieved the highest flexural strength of 80 MPa, whereas the specimen with higher sugar palm fiber content (Specimen 3) showed the lowest value of 59.4 MPa. Improved performance was strongly associated with uniform fiber distribution, effective interfacial bonding, and reduced voids. Overall, the findings highlight the considerable potential of natural fibers as reinforcements for producing strong, durable, and sustainable composite materials.
Co-Authors abdurrouf Abdurrouf Achmad, Nanang Suffiandi Adi Mustiko, Vijay Adi Soeprijanto Afan Hamzah, Afan Agung Purniawan, Agung Agus Prianto Aidha Putri, Evi Zulfa Akhmad, Nanang Suffiadi Al Hakim, Faris Helmi Ali Altway Ali Selamat Aliyadi, Aliyadi Alkamalia, Andini Nabila Anggi N U, Elfina Arviana, Ekyk Aulia, Anisa Fatma Awalludin, Fachrul Ayub Dwi Anggoro, Ayub Dwi Azizah, Hanifha Nur Cahyono, Agung Dwi Cobantoro, Adi Fajaryanto Darminto . Desriyanti, Desriyanti Diah Pratami, Riska Dyah Mustikasari Edy Kurniawan, Edy Eli Purwati, Eli Fadelan Fadelan, Fadelan Ghulam Asrofi Buntoro Giovani, Nurya Hadi, Hadi Santoso Happy Susanto Ida Widaningrum, Ida Ifana, Ayu Meilia Intan Vidyastri, Rhesma Irvan Nur Ridho Jamil, Salma Fauziyah Johari, Norhasnidawani Kaloka, Ardista Izdhihar KUNTANG WINANGUN Kusnawan, Wawan Lailatul Qomariyah, Lailatul Lee, Vannajan Sanghiran Lestari, Riza Ayu Lily Pudjiastuti, Lily Munaji, Munaji Muzakki, Fikrun Najib Niniek Fajar Puspita, Niniek Fajar Nugroh, Oki Cahyo Nurcahyo, Rifky Irfan Nurdin, Zurifah Nurlaili Humaidah, Nurlaili NURUL FAIZAH Oki Cahyo Nugroho, Oki Cahyo Prasetyo, Arif Adi Prasetyo, Arya Aji Prayadi, Icha Nur Putra, Muhammad Benaldo Anugrah putra, wawan Rahmawati, Alvina Eka Rizki Dwi Ardika Roziqin, Bahar Saputra, Rangga Ardana Sitorus, Iwan Ramadhan Sudarno Sudarno Sudarno, Sudarno Sugianti, Sugianti Suprapto Suprapto Syah, Moch. Aziz Zulian Syukur, Muhammad Adnan Thufailah, Gladys Sukma Trisanti, Warlinda Eka Trisnadi Putra, Wawan Wati, Ni’mah Wawan Trisnadi Putra, Wawan Trisnadi Winardi, Yoyok Wirapandhu, Dwi Yusuf, Farid Zacky, Uruqul Nadhif Zuchrillah, Daril Ridho Zulkarnain, Zulkarnain