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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Journal of Earth and Marine Technology (JEMT)
Tedy Agung Cahyadi
Department of Mining Engineering, Universitas Pembangunan Nasional “Veteran”, Yogyakarta
Astronomy Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Materials Science & Nanotechnology Physics Transportation

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Instrumentation and Data-Processing Workflow for AMD Neutralization: Linking Rock Formation, Water-Quality Measurements, and Index Computation Yazid Fanani; Eko Teguh Paripurno; Tedy Agung Cahyadi; Ahmad Mushoffa; Andris Emanuel Korompis; Muhammad Rizky Redy Asmara; Dwi Fitri Yudwiantoro
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.108469

Abstract

We use the Integrated Geo-Hydrochemical Risk Assessment (IGHRA) as a workflow driven by instruments. This workflow connects (i) evidence from rock formations, (ii) repeated water-quality measurements, and (iii) calculations of indices to manage AMD neutralization. The evidence from formations, including sulfide-bearing, quartz/glass-rich, and widely sericitized units, shows why we need CaO to quickly restore pH and precipitate Fe and Mn. Meanwhile, sulfate (SO₄) remains stable and controls overall compliance. We conduct 5 bench tests per condition to assess a series of CaO doses (1–10 g L⁻¹) and a fixed-mass series of CaCO₃ sizes. With CaO, pH increases to about 6.0-6.4 at 10 g L⁻¹. Fe levels drop to about 7-11 mg L⁻¹, Mn to about 0.16 mg L⁻¹, and SO₄ to about 1.7-1.75 g L⁻¹. These changes help quantify the improvements during treatment and reveal the ongoing sulfate load. Indices calculated from post-treatment samples indicate that the PLI(dose) for Fe, Mn, and SO₄ decreases from about 3.2 at 1 g L⁻¹ to about 0.49 at 10 g L⁻¹. At the same time, Residual Risk (RR) falls from about 67% to about 17%. In contrast, the responses from CaCO₃ remain limited by kinetics at low pH, with high indices across different mesh sizes. To turn this chemistry into practical actions, we determine the size of the polishing step using HRT. Existing ponds (about 884 m³) with a flow rate of approximately 0.0256 m³ s-1 provide about 9.6 hours, which is below the target of about 84 hours. A redesigned cell about 10,125 m³ offers around 110 hours for handling solids and buffering performance. Overall, IGHRA transforms treatment-stage measurements into reproducible indices and clear residence-time goals for mine waters close to the surface.
Cost-Based Environmental Liability Assessment of Acid Mine Drainage Management within the Integrated Geo-Hydrochemical Risk Assessment (IGHRA) Framework Yazid Fanani; Eko Teguh Paripurno; Dwi Fitri Yudiantoro; Tedy Agung Cahyadi
Journal of Earth and Marine Technology (JEMT) Vol 6, No 1 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v6i1.8879

Abstract

Acid mine drainage generates environmental liabilities that mining operators must translate into measurable management costs. This study assesses the cost-based environmental liability of acid mine drainage management within the Integrated Geo-Hydrochemical Risk Assessment (IGHRA) framework by linking pollution risk, treatment performance, and environmental cost into a single risk-to-cost evaluation. The study uses source characterization, mine water quality data, compliance-based risk indicators, treatment performance, and operational cost components to estimate two principal cost categories, namely restoration cost and preventive expenditure cost. Restoration cost represents the annual cost required to restore contaminated mine water until all regulated parameters comply with the applicable standard. In contrast, preventive expenditure represents the five-year cost required to suppress future acid generation from potentially acid-forming material through selective handling, temporary stockpiling, installation of compacted clay cover, and runoff control. The results show that the only CaO scenario produces the lowest treatment cost, but does not achieve full compliance because sulfate remains above the standard. The CaO 10 g/L and BaCl₂ 3.0 g/L scenario achieves full compliance and provides the most economical restoration cost among the compliant options, with an estimated value of IDR 516,463,856 per year. The total preventive expenditure cost over five years reaches IDR 3,832,950,186. At a midpoint selling price of IDR 89,000 per ton, the compliant CaO and BaCl₂ scenario exerts an environmental cost pressure of 8.58 percent on projected gross revenue. These results show that the IGHRA framework can convert acid mine drainage risk into measurable environmental liability and can support technically grounded and economically accountable mine water management.
Co-Authors Ahmad Mushoffa Andris Emanuel Korompis Dwi Fitri Yudiantoro Dwi Fitri Yudwiantoro Eko Teguh Paripurno Muhammad Rizky Redy Asmara Yazid Fanani