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Journal : Ranah Research : Journal of Multidisciplinary Research and Development

Characteristics of Geological Conditions on Safety Factor (FK) of Open-Pit Slope and Landslide Mitigation at the Green Pit Location of Nickel Mining at PT. IFISHDECO Tb Hasibuan, Parlindungan; Chaerul, Muhammad; Gusty, Sri
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 7 No. 3 (2025): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v7i3.1422

Abstract

The research location is within the IUP area of PT. IFISHDECO Tbk (122.168°–122.204° E and 4.371°–4.404° S), Tinanggea, South Konawe Regency, Southeast Sulawesi Province. This study aims to analyze the Safety Factor (SF) values of the slopes and the probability of landslide potential at the green pit mining slopes, as well as the landslide hazard mitigation map. The data used include engineering geological characteristics, topographic measurements obtained via total station, aerial photographs (drone), and rock mechanics sample test results. The SF analysis applied is the Simplified Bishop method with Mohr-Coulomb analysis, processed using Slide ver.6 software, along with landslide hazard potential maps and landslide hazard mitigation maps based on the Ministry of Energy and Mineral Resources of the Republic of Indonesia Decree (KEPMEN ESDM RI) No. 1827 K/30/MEM/2018.The research results are derived from slope stability analysis at the green pit mining site based on the static Safety Factor (SF) according to the rules of KEPMEN ESDM RI No. 1827 K/30/MEM/2018, which are as follows: - Single Slope Type: SF 0.91 - 1.26 (Unstable – Balanced) - Inter-ramp Slope Type: SF 1.15 - 1.25 (Balanced) - Overall Slope Type: SF 1.31 – 1.37 (Stable). The probability of soil movement (landslide) potential is 10 – 25%, with a medium severity landslide category. The medium severity landslide category applies when there are consequences such as serious human injuries, damage to facilities and infrastructure from 25% to 50%, production stoppages of more than 12 hours but less than 24 hours, buried reserves that can still be recovered, and environmental damage within the scope of the IUP area.The landslide hazard potential map is divided into three severity categories: low landslide severity, medium landslide severity, and high landslide severity. The landslide hazard mitigation map for the green pit open-pit mining site provides information on potential hazard zones covering an area of 0.33 hectares at the pit slope, safe zones covering 2 hectares outside mining activities, evacuation routes with distances ranging from 68 m to 267 m to the safe zone, and worker assembly points (muster points) equipped with emergency response facilities such as first-aid supplies, transportation means, mobilization facilities, and communication equipment, all of which are part of the mining safety management system.
Model Terowongan Pipa Sudetan Ciliwung-Cipinang dalam Mitigasi Banjir Kali Ciliwung dengan Metode HEC-RAS ver.6.3 Makkaraka, Muhammad Lottong; Chaerul, Muhammad; Hasibuan, Parlindungan; Nurdyansyah, Haris; Pasorong, Erich Purnama
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 7 No. 6 (2025): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v7i6.1749

Abstract

Penelitian ini bertujuan untuk menganalisis model terowongan pipa sudetan ciliwung cipinang dalam melakukan mitigasi kali ciliwung. Dalam memodelkan terowongan peneliti menggunakan aplikasi HEC-RAS 6.3 untuk membuat aligment terowongan yang meliputi penampang terowongan (cross section) dan (long section) serta memasukan debit banjir Q2th, Q5th, Q10th, Q25th, Q50th, dan Q100th. Penelitian ini menggunakan mix methode yaitu deskriptif kuantitatif, dengan memodelkan penampang terowongan serta memperhitungkan kondisi aliran bebas dan tertekan. Adapun dari hasil pemodelan penampang long section terowongan sudetan didapatkan nilai WS Q5 berada pada elevasi 7m, Q10 elevasi 12m, Q25 elevasi 13m, Q50 elevasi 15m, dan Q100 elevasi 16m. Adapun pada elevasi 9.67 m kondisi aliran bebas masih kategori stabil, elevasi rata-rata berada pada elevasi 11m Dimana kondisi aliran bebas ini masuk dalam kategori superkritis. Kesimpulan yang di peroleh dari keseluruhan Analisa data yaitu pada penampang long section terowongan didapatkan nilai tinggi muka air pada elevasi terendah yaitu pada Q5=7m dan nilai tinggi muka air pada elevasi tertinggi yaitu Q100=16m. Sehingga didapatkan bahwa terowongan pipa sudetan termasuk cara alternatif untuk melakukan mitigasi banjir khususnya pada lokasi kali ciliwung
Kinerja Pengolahan Air Limbah Domestik Terhadap Parameter Nitrat (NO₂⁻) dan Fosfat (PO₄³⁻) Dengan Metode Moving Bed Biofilm Reactor (MBBR) Di Instalasi Pengolahan Air Limbah (IPAL) Losari Idris, M. Naufal Az Zarqan; Desi, Natsar; Chaerul, Muhammad
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 7 No. 6 (2025): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v7i6.1801

Abstract

This study analyzes the performance of the Losari Wastewater Treatment Plant (IPAL) in reducing the levels of the pollutants Nitrite (NO2¯) and Phosphate (PO4³¯) in domestic wastewater using the Moving Bed Biofilm Reactor (MBBR) method. The issue of domestic waste in large cities, particularly in coastal areas like Losari, is becoming increasingly complex due to high population density and tourism activities, which require an effective waste treatment system that meets environmental quality standards. The main objective of this research is to analyze the chemical parameters (Nitrite and Phosphate) in the treatment of domestic wastewater using the MBBR method at the Losari wastewater treatment plant, as well as to analyze the optimization of wastewater treatment using this method. This research uses an observational method with a quantitative approach to measure the performance of MBBR in reducing pollutant levels, with wastewater samples taken from the inlet, MBBR tank, and outlet. The testing was conducted at the South Sulawesi Provincial Environmental Agency Laboratory. The test results show that the MBBR process is effective in reducing phosphate, with all testing points showing phosphate concentrations below the quality standard of 2 mg/L. However, for the nitrite parameter, although the levels at the inlet point are within the safe limits, there is an increase in levels at the outlet point (0.628 mg/L), which exceeds the quality standard of 0.6 mg/L, indicating that the nitrification-denitrification process is not yet optimal. Overall, the Losari wastewater treatment plant system with MBBR has successfully managed phosphate well, but further optimization is needed for nitrite processing to meet the established quality standards.