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All Journal Chemistry Indonesian Journal of Chemical Research ULIN: Jurnal Hutan Tropis Journal Of Chemical Process Engineering
Irviansyah, Alfian
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science

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Identifikasi Batuan PAF, NAF dan UNCERTAIN dengan Menggunakan Metode NTAPP Pada Area PT. Trubaindo Coal Mining, Melak-Kalimantan Timur Irviansyah, Alfian; Sitorus, Saibun; Panggabean, Aman Sentosa
Indonesian Journal of Chemical Research Vol 7 No 2 (2020): Edisi Bulan Januari (Edition for January)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.7-alf

Abstract

The research about identification of PAF, NAF and uncertain rock using NTAPP method in the PT. Trubaindo Coal Mining has been done. This research was conducted as an effort to control the potential for the formation of acid mine drainage, with identifying the types of mine rocks using certain testing methods. Some important parameters such as Total Sulfur Level, Slurry pH, Total Actual Acidity (TAA), Chromium Reducible Sulfur (CRS) and Acid Neutralizing Capacity (ANC) using the NTAPP method on mine rocks have been determined to identify mining rock category categories. Based on the results of tests on 101 samples, 63 samples were identified included in the category of rocks that are not NAF (Slurry pH value = 4.1 - 8.9; Total Sulfur = 0.01-0.60 %; CRS = 0.01-0.10 % and NTAPP = 0.030-0.959 %), 38 samples were classified as PAF (pH Slurry = 2.9-7.9; Total Sulfur = 0.01-5.10 %; CRS = 0.11-2.04 % and NTAPP = 0.053-4.571 %), and no sample was included in the uncertainty category.
Bias Testing of Mechanical Sampling System Based on Total Moisture and Ash Analysis Ichsan, A Muhammad Nur; Irviansyah, Alfian
Journal of Chemical Process Engineering Vol. 9 No. 3 (2024): Special Issue
Publisher : Fakultas Teknologi Industri - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/jcpe.v9i3.1489

Abstract

As one of the energy sources utilized in various industries, coal quality is determined by its maceral composition, mineral matter, and coalification rank. Generally, coal quality can be assessed through proximate and ultimate analyses conducted in laboratories. Coal samples can be collected from various locations, such as moving streams or stationary setups, using either manual or mechanical systems. In this study, a bias test was conducted on a mechanical sampling system. Bias is detected as the difference between test results and accepted reference values. The acceptability of reference values is established through simultaneous coal sampling using both the reference method and the system under testing. Bias testing is required for new installations, system relocations, system upgrades or modifications, and system maintenance. The procedure involves several stages, including pre-bias inspection, bias inspection, sample analysis, statistical analysis, and data interpretation. A total of 30 paired samples were analyzed, with the parameters measured being total moisture and ash content. These parameters were mathematically processed to calculate the Hotelling’s T² value, which was then compared to the T0² value to determine the presence or absence of bias. The results of the study indicated that the T² value was 4.425, while the T0² value for n = 30 and p = 2 was 6.885. This demonstrates that no bias was detected in the mechanical sampling system, as T² < T0².
Menakar Peran Serta Masyarakat dalam Pelestarian Mangrove: Analisis Faktor Pendukung dan Tantangannya di Kalimantan Timur Deciawarman, Erika; Wibowo, Putra Peni Luhur; Irawan, Dedy; Irviansyah, Alfian; Darmin, Darmin; Rahmawati, Rahmawati
ULIN: Jurnal Hutan Tropis Vol 9, No 2 (2025)
Publisher : Fakultas Kehutanan Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32522/ujht.v9i2.23423

Abstract

Penelitian ini secara sistematis meninjau peran partisipasi masyarakat dalam konservasi mangrove di Kalimantan Timur, dengan memperhatikan nilai ekologi dan socio-ekonomi yang tinggi dari mangrove serta ancaman serius yang dihadapi akibat konversi lahan dan perubahan iklim. Studi ini bertujuan untuk menggambarkan bentuk-bentuk partisipasi masyarakat, menganalisis faktor-faktor pendukung dan penghambat, serta merumuskan rekomendasi kebijakan untuk memperkuat konservasi mangrove berbasis masyarakat. Dengan menggunakan metodologi tinjauan kualitatif, penelitian ini mensintesis literatur untuk mengidentifikasi isu-isu kunci, tema-tema lintas studi, dan pendekatan kebijakan terkait keterlibatan masyarakat. Temuan menunjukkan bahwa konservasi dan restorasi yang sukses sangat bergantung pada partisipasi masyarakat yang aktif, dengan model seperti Pengelolaan Mangrove Berbasis Masyarakat (CBMM) terbukti lebih efektif. Secara ringkas, makalah ini menyimpulkan bahwa partisipasi masyarakat yang aktif dan berkelanjutan sangat kritis untuk konservasi mangrove yang efektif. Partisipasi ini didukung oleh kerangka institusional yang kuat, pendidikan berkelanjutan, dan upaya kolaboratif lintas sektor, yang semuanya berkontribusi pada pencapaian tujuan pembangunan berkelanjutan yang lebih luas, terutama SDG 14 yang menekankan konservasi ekosistem laut dan pesisir, serta SDG 13 melalui peran mangrove dalam mitigasi perubahan iklim.
Co-Authors Aman Sentosa Panggabean Darmin Darmin, Darmin Deciawarman, Erika Ichsan, A Muhammad Nur Irawan, Dedy Rahmawati, Rahmawati Saibun Sitorus Wibowo, Putra Peni Luhur