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Marpaung, Nalom D
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STUDI PEMANFAATAN BOTTOM ASH UNTUK PENCEGAHAN AIR ASAM TAMBANG DAN MENURUNKAN KONSENTRASI LOGAM TERLARUT PADA BATUAN BREKSI VULKANIK DENGAN SKALA LABORATORIUM Setia Budi, Agung; Marpaung, Nalom D; Onwardana, M. Eka
Jurnal Sains dan Teknologi ISTP Vol. 20 No. 01 (2023): Desember
Publisher : LPPM ISTP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59637/jsti.v20i01.359

Abstract

Mining activities have the potential for contamination in the form of acid mine drainage. Prevention of acid mine drainage (AAT) can be carried out by covering materials that have the potential to form AAT (Potentially Acid Forming / PAF) using non-potential (Non Acid Forming / NAF) materials. So that it can stop or reduce the contact between sulfide minerals with air and / or water. However, the presence of NAF material is often not found in large quantities to be able to isolate all PAF materials. Therefore, another material is needed as an alternative in preventing AAT formation. One of the materials that has the potential to be used is bottom ash which is the result of burning coal at the PLTU. A study was conducted with samples of volcanic breccias which are PAF rocks and volcanic breccias mixed with bottom ash material using the Leach Column Test (LCT) method. LCT test results obtained varying pH values and dissolved metal ions. In volcanic breccias, the pH value fluctuates in the range of 2.3-0.8 with high dissolved metals. Meanwhile, volcanic breccias mixed with bottom ash obtained pH values that were retained between 3.57-3.56 with low dissolved metal concentrations. The test results show that the addition of 30% bottom ash can increase the pH value and decrease the dissolved metal concentration in volcanic breccia. The addition of bottom ash material can increase the pH of volcanic breccias but is not able to neutralize the acidity of volcanic breccias.
ANALISA GEOMETRI JALAN TERHADAP PRODUKTIVITAS ALAT ANGKUT DALAM KEGIATAN PENGANGKUTAN MATERIAL TIMBUNAN DI PTSUMATERA PEMBANGKIT MANDIRI KECAMATAN PAHAE JULU KABUPATEN TAPANULI UTARA PROVINSI SUMATERA UTARA Nainggolan, Roy Pronsen; Marpaung, Nalom D; Debataraja, Semangat Marudut Tua
Jurnal Sains dan Teknologi ISTP Vol. 20 No. 01 (2023): Desember
Publisher : LPPM ISTP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59637/jsti.v20i01.360

Abstract

The research was conducted at PT. Sumatra Pembangkit Mandiri, which is engaged in hydropower. The road is one of the factors that greatly influence this research. Piled material hauling activities are influenced by the geometry of the road. The road geometry includes straight road width, bends, road grade and super elevation. Based on the actual calculation, the production is 124.56 LCM/hour. After doing theoretical calculations, the production is 209 LCM/hour. From the results of the analysis of the road geometry obtained with a distance of 500 m, the road segment is divided into 12 segments, which consist of 8 straight roads and 4 curved roads. The actual straight road width in the field starts from 5-6 meters while the minimum road width is 7 meters, in segments A-B to L-M it is necessary to widen the road. The actual width of the bend road starts from 6-7 meters, while the minimum road width of the bend is 8 meters, the C-D, E-F, H-I and J-K segments do not meet the minimum road conditions, so it is necessary to widen the bend road. The actual road grade ranges from 1.4-20.6%, while the maximum road grade is 8%, the E-F to L-M road grade segments must be repaired because they exceed the maximum road grade. The actual superelevation ranges from 1.4-1.05, while the minimum superelevation is 1.01 meters, the E-F and K-L segments require additional superelevation height because it is less than the maximum superelevation value.Based on field analysis using actual road geometry data, the cycle time obtained is 1415 seconds, and the theoretical cycle time is 841.5. Then the calculation of production per/hour using the cycle time value is obtained, the actual production obtained is 124.56 LCM/hour while the production using the theoretical obtained is 209.45 LCM/hour.
PENYEBARAN KECEPATAN AIR DENGAN DIAMETER PIPA DN250, DN200 DAN DN150 PADA INLET DAN OUTLET DENGAN ELBOW 45 DERAJAT ANTARA PIPA HORIZONTAL DAN PIPA MIRING PADA TINGGI SLOPE 7 M naibaho, bonar sari monang; Marpaung, Nalom D; Ponten M.Naibaho
Jurnal Sains dan Teknologi ISTP Vol. 22 No. 02 (2025): JANUARI
Publisher : LPPM ISTP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59637/jsti.v22i2.462

Abstract

Pada industri pertambangan sistem penirisan air dalam tambang sangat diperlukan. Hal ini mengingat pengaruh air yang masuk kedalam area penambangan. Terutama aktivitas penambangan pada area yang dekat dengan sump pit. Sehingga diperlukan pemilihan pompa dan sistem pemipaan untuk penirisan tambang. Penulis melakukan penelitian dengan pipa isap dan pipa buang pada PT xxx. Rangkaian pemipaan dengan sudut 450 untuk bench dengan panjang slope 7 meter. Penelitian melakukan simulasi dengan ANSYS Fluent. Perbandingan pipa yang digunakan dengan diameter 150 (DN150), 200(DN200) dan 250 (DN250). Kecepatan aliran fluida 0,48 m/detik. Terjadi perbedaan kecepatan maksimum antar inlet dan outlet pada pusat aliran fluida dengan pipa DN150 sebesar 0,064 m/detik , DN200 sebesar 0,0611 m/detik dan DN250 sebesar 0,0645 m/detik.
ANALISA MERKURI (Hg) PADA SEDIMEN SUNGAI AEK GANTANG DI KECAMATAN HUTABARGOT, KABUPATEN MANDAILING NATAL SUMATERA UTARA Widiastuti, Dewi W; Marpaung, Nalom D; Wardana, M. Eka
Jurnal Sains dan Teknologi ISTP Vol. 23 No. 01 (2025): JULI
Publisher : LPPM ISTP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59637/jsti.v23i01.479

Abstract

The analysis of mercury (Hg) in the sediments river of the Aek Gantang’s river in Hutabargot District, Mandailing Natal Regency, North Sumatra has been conducted. The objective of this research is to determine the Hg content in river sediments to understand its pollution potential. The method used is observational, and data analysis is performed using qualitative descriptive analysis. The Hg content analysis was conducted using the USEPA 3050B/USEPA245.7 method. The parameters used are based on ANZECC/ARMCANZ with a threshold value of 0.15-1.0 ppm. The Hg content obtained in the river sediments at the Aek Kaporas location, before any gold mining activity, was 0.042 ppm, while at the downstream location after gold mining activities in Aek Gantang, it was 0.203 ppm. The results show that small-scale mining activities can increase the Hg content in river sediments when compared to the standards.
Co-Authors Debataraja, Semangat Marudut Tua naibaho, bonar sari monang Nainggolan, Roy Pronsen Onwardana, M. Eka Ponten M.Naibaho Setia Budi, Agung Wardana, M. Eka Widiastuti, Dewi W