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All Journal Eksergi: Chemical Engineering Journal Al-Ard: Jurnal Teknik Lingkungan Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi
Prastistho, Widyawanto
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Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics

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Combination Process of Rice Husk Ash Coagulation and Electrocoagulation for Palm Oil Mill Effluent Treatment Lestari, Indriana; Amalia, Dwi; Prastistho, Widyawanto; Angin, Jeremia Bernadin Perangin; Zenatik, Muhammad Haekal
Eksergi Vol 22 No 2 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i2.14305

Abstract

Palm oil mill effluent (POME) poses a significant environmental threat due to its high organic and inorganic load. This study introduces a novel integration of rice husk ash (RHA) coagulation and electrocoagulation (EC) for sustainable POME remediation. Thermally treated at 500 °C for two hours, RHA was characterized via FTIR, revealing active silica-based functional groups conducive to charge neutralization and adsorption. Treatment experiments employed 9.3 g/L RHA and aluminum electrodes spaced 20 mm apart under varying currents of 10, 15, and 20 A over 15, 30, and 45 minutes. At the highest tested condition (9.3 g/L RHA, 20 A, 45 minutes), the integrated process achieved 78% total solids (TS) and 43% chemical oxygen demand (COD) removal, surpassing individual RHA coagulation removed 34% TS and 17% COD, while EC alone achieved 43% TS and 18% COD removal. The superior performance stems from synergistic flocculation, adsorption, and electroflotation. Compared to conventional methods, the combined RHA–EC system offers faster treatment, lower chemical and energy demands, and improved sustainability. These findings suggest a scalable solution for decentralized POME treatment, particularly in resource-limited palm oil-producing regions.
Stabilisasi merkuri pada limbah tambang dengan menggunakan zeolit alam Budianta, Wawan; Idrus, Arifudin; Kurniawan, Winarto; Prastistho, Widyawanto
Al-Ard: Jurnal Teknik Lingkungan Vol. 8 No. 2 (2023): March
Publisher : Department of Environmental engineering, Faculty of Science and Technology, Islamic State University Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/alard.v8i2.1779

Abstract

Mercury contamination caused by artisanal gold mining waste would become an environmental problem if there were no remediation actions. This study aimed to investigate the ability of natural zeolite obtained from Gunungkidul Yogyakarta to stabilize mercury in mining waste or tailing. Tailing samples were obtained from three locations on Kulon Progo, Wonogiri, and Banyumas, and the natural zeolite sample was obtained from Gunungkidul, Yogyakarta. The batch experimental study was conducted to test the ability of the effectiveness of natural zeolite in stabilizing mercury in tailing. The result of the study shows that the natural zeolite used in the experimental study can be used to reduce the mercury concentration in tailing. The natural zeolite's ability for stabilization varies and depends on the initial mercury concentration in tailing and the natural zeolite dose.
Analisis Ambang Batas Curah Hujan Dengan Pendekatan Statistik Median di Daerah Rawan Longsor Samigaluh, Kulon Progo Marganiswati, Yudha Tintana; Maharani, Yohana Noradika; Cahyadi, Tedy Agung; Prasetya, Johan Danu; Prastistho, Widyawanto
Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Volume 13 Issue 3 December 2025
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/euler.v13i3.34962

Abstract

Landslides in tropical regions are often triggered by intense rainfall, causing significant impacts. This study assesses the feasibility of rainfall thresholds for landslide early warning in Kapanewon Samigaluh, Kulon Progo. The objectives include characterizing the rainfall regime, testing the relationship between rainfall and landslide events, evaluating spatial consistency with the landslide hazard map, and establishing and verifying operational thresholds. Landslide data from the BPBD and daily rainfall data from BMKG were processed by aligning the dates and performing quality checks, followed by quantitative analysis. The number of landslide events analysed was 197, with rainfall data collected from a single measurement station. Thresholds were set using the median approach for daily rainfall (CH0) and three-day accumulation (CH−2) from the 2014–2023 series. Verification was conducted on 213 days of the 2024 rainy season using Proportion Correct. Characterization shows a consistent monsoonal pattern with notable interannual variability. A positive tendency is observed between annual rainfall accumulation and landslide frequency. Spatially, around 93% of events occur in high-hazard zones. The median-based thresholds obtained are 31 mm for CH0 and 81 mm for CH−2. Operational verification results in PC values of 84.0% for CH0 and 83.6% for CH−2, indicating acceptable performance. Physically, the intensity of rainfall on event days effectively distinguishes landslide from nonlandslide days, while three-day rainfall accumulation increases risk through soil saturation. These findings support the implementation of locally calibrated thresholds for strengthening early warning, with a focus on monitoring during the rainy season. However, the potential for false alarms related to geological conditions and land-use variability may affect model accuracy. Furthermore, periodic recalibration of thresholds is necessary to address uncertainties resulting from changing hydrometeorological conditions and land-use dynamics.
Co-Authors Amalia, Dwi Angin, Jeremia Bernadin Perangin Arifudin Idrus Cahyadi, Tedy Agung Kurniawan, Winarto Lestari, Indriana Marganiswati, Yudha Tintana Prasetya, Johan Danu Wawan Budianta Yohana Noradika Maharani Zenatik, Muhammad Haekal