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All Journal ETHOS: Jurnal Penelitian dan Pengabdian kepada Masyarakat
Qurniawan, Ridho
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering

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Particle Size Effects on Limestone Channel Treatment of Acid Mine Drainage Qurniawan, Ridho; Dwifajar Prabowo, Jerry; Nurrochman, Andrieanto
ETHOS: Jurnal Penelitian dan Pengabdian kepada Masyarakat Vol. 14 No. 2 (2026): (Juli, 2026) Ethos: Jurnal Penelitian Dan Pengabdian Kepada Masyarakat (Sains
Publisher : UPT Publikasi Ilmiah UNISBA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29313/ethos.v14i2.7919

Abstract

Acid mine drainage (AMD) is acidic wastewater from mining activities containing dissolved heavy metals, posing serious environmental threats if discharged without treatment. Despite various passive treatment technologies, the relationship between limestone particle size and physicochemical parameters in Open Limestone Channel (OLC) systems remains insufficiently understood, particularly regarding the trade-off between short-term reactivity and long-term armoring susceptibility. This study aimed to simulate and evaluate OLC performance in neutralizing synthetic AMD (FeSO₄ solution; pH 0.99; Fe³⁺ = 10 mg/L) using Padalarang limestone in three particle sizes (#10, #12, and #16 mesh). The novelty lies in the integrated evaluation of pH, ORP, TDS, and EC alongside direct visual observation of armoring formation under controlled laboratory conditions. Results showed that #10 mesh achieved the highest average pH of 7.15 (range: 6.64–7.68), while #16 mesh exhibited faster passivation and more intensive armoring despite higher initial reactivity. All channels reduced ORP from 557 mV to ~135–145 mV and decreased TDS, while EC increased due to Ca²⁺ and HCO₃⁻ ion release. Appropriate particle size selection is critical to optimizing reactivity and durability in OLC-based passive AMD treatment.
Co-Authors Andrieanto Nurrochman Dwifajar Prabowo, Jerry