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All Journal Eksergi: Chemical Engineering Journal SAINS TANAH - Journal of Soil Science and Agroclimatology 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 Education 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 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.
Re-evaluating the evidence of aflatoxin B1 intercalation into smectite interlayer: a review based on basal spacing data Prastistho, Widyawanto; Apsari, Cintya Nurul; Gusnaniar, Niar; Budianta, Wawan; Promentilla, Michael Angelo B.; Utami, Setyowati Triastuti
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 22, No 1 (2025): June
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v22i1.92453

Abstract

The bonding mechanism of aflatoxin B1 (AfB1) onto smectite in the batch adsorption test remains a subject of ongoing debate. One key aspect under contention is whether the interlayer of smectite is accessible to the AfB1 molecule. Some researchers contested the possibility of AfB1 intercalation into the smectite interlayer by highlighting the lack of discernible differences in basal spacing value before and after the adsorption experiment. Conversely, others have advanced the opposite argument based on observations indicating an increase in basal spacing value after adsorption. This study aims to resolve the discrepancy through a comparative examination of data from several previous studies that reported basal spacing values derived from X-ray diffraction (XRD) analysis, both before and after adsorption tests. By also considering the characteristic swelling behavior of smectite, this comparative examination explains the differing perspectives. The lack of discernible differences in basal spacing value pre- and post-adsorption tests, which was interpreted as the absence of AfB1 intercalation, was attributed to the fact that the initial samples were inherently in hydrated condition, as indicated by basal spacing values of 1.41 to 1.59 nm, whereas in the dry state, these values would typically be ~0.98 to ~1.0 nm, thereby precluding further expansion. Consistent with a previous study that suggested AfB1 bonding to smectite in hydrated conditions occurred through hydrogen bonding within the interlayer, we propose that the hydration state of smectite will significantly influence AfB1 uptake. Thus, further research of adsorption test to investigate the relationship between AfB1 uptake as a function of the hydration state on smectite minerals is strongly suggested.
Co-Authors Amalia, Dwi Angin, Jeremia Bernadin Perangin Apsari, Cintya Nurul Arifudin Idrus Cahyadi, Tedy Agung Gusnaniar, Niar Kurniawan, Winarto Lestari, Indriana Marganiswati, Yudha Tintana Prasetya, Johan Danu Promentilla, Michael Angelo B. Utami, Setyowati Triastuti Wawan Budianta Yohana Noradika Maharani Zenatik, Muhammad Haekal