Hasil Pencarian  ::  Simpan CSV :: Kembali

"Unit Penambangan Batubara Tanjung Enim dari PT Tambang Batubara Bukit Asam memproduksi Batubara sebanyak 8,9 Juta ton per tahun (6,4 juta m³ /tahun) dan tanah penutup sebanyak 37,5 juta m³ /tahun. Dari jumlah tersebut sistem Bucket Wheel Excavator (BWE) hanya memproduksi batubara 2,7 juta ton/ tahun (2 juta m³ /tahun) dan tanah penutup 10.28 juta m³ /tahun), selebihnya adalah hasil produksi dari sistem Buldozer, Shovel, Loader dan Dump Truck yang dikerjakan oleh pihak ke 3 yaitu Subkontraktor I Perusahaan Jasa Penambangan.Produktivitas dari BWE ini dirasakan rendah, karena pada musim penghujan BWE tidak dapat bekerja dengan efisien. Dibandingkan dengan pekerjaan yang disubkontrakkan kepada pihak ke 3, ongkos produksinya lebih tinggi, padahal seharusnya pekerjaan dengan menggunakan BWE yaitu alas yang dirancang khusus untuk pekerjaan penambangan seharusnya biayanya lebih rendah. Untuk itu dilakukan analisis untuk mencari kombinasi yang lebih baik dalam menggunakan peralatan penambangan untuk peningkatan perolehan batubara dan tanah penutup.Pertama kali dilakukan pengumpulan data mengenai berbagai peralatan yang dapat dipakai untuk manambang batubara. Kemudian dilakukan perhitungan biaya produksi penambangan batubara dengan berbagai kombinasi alat produksi pada berbagai kondisi cuaca dan lapangan. Akhirnya diperoleh kombinasi peralatan yang mernbentuk biaya tolal terendah.Dari hasil-hasil analisa diperoleh kombinasi I, II, III memberikan biaya yang terendah.

---

Tanjung Enim Coal Mining Unit of Bukit Asam Coal Mining Company mines coal in amount 8.9 million of tons per year (6.4 million m³ per year) and covering land in amount of 37.82 million m³ per year. From this total amount, the Bucket Wheel Excavator (BWE) system only produces 2.7 million of tons (2 million m³ per year) and the covering land in amount of 10.28 million m³ per year).

The productiveness of the BWE system is considered low, as the system could not work efficiently during the rainy season. The production cost of the BWE system is also higher than the works that are carried out by using shovel, bulldozer, loader and dump truck equipments and are subcontracted to a third party. The system of BWE, equipment designed specially for mining works, is supposed to cut down the mining costs. Therefore, an analysis is carried out to seek a better combination of using mining equipments and improving acquisition of coal and covering land amount in the mining activities.

First, data on various equipments used for coal and covering land mining should be collected. Then, there should be a calculation on production costs of the coal and covering land mining by using combination of production equipments in various weather and field condition. The found combination will lead to the lowest total cost.

The analysis resulted that combination I, II & III would show the lowest total cost."

"[ABSTRAKLahirnya harga patokan batubara (HPB) merupakan sebuah kebijakan yang penting dalam rangka menata kembali manfaat yang optimal dalam pengelolaan batubara di Indonesia. Indonesia memiliki sumberdaya dan cadangan yang cukup besar, yaitu cadangan saat ini sekitar 41 miliar ton. Sedangkan produksi tahun lalu sudah mencapai sekitar 450 juta ton sehingga telah menjadi negara pengekspor batubara no.1 di dunia. Oleh karena itu HPB merupakan sebuah kebijakan yang diharapkan dapat menguntungkan beberapa pihak. Pihak pelaku baik produsen dan konsumen telah memiliki alat bantu yang cukup jelas dalam penentuan harga batubara baik untuk harga spot atau kontrak. Sedangkan bagi pemerintah, tentu saja salah satu pusat perhatiannya adalah ketentuan harga untuk penetapan penerimaan negara semakin jelas dan transparan. Oleh karena itu penelitian ini perlu dilakukan untuk mengkaji keefektifan perhitungan harga patok batubara yang telah ditetapkan oleh Kementrian ESDM melalui Peraturan Direktur Jenderal Mineral dan Batubara.Selain itu penelitian ini dilakukan guna memberikan manfaat terhadap perusahaan tambang batubara untuk bagaimana melakukan aktivitas kegiatannya agar dapat tetap bertahan di dalam menghadapi dan mengantisipasi perubahan harga batubara yang fluktuatif dan semakin cenderung menurun. Penelitian ini menggunakan data amatan perusahaan energi yang beroperasi di salah satu area tambang di Indonesia. Penelitian ini diharapkan dapat menghasilkan suatu model perhitungan untuk menentukan keefektifan dan kelayakan keekonomiannya dalam usaha pertambangan batubara. Model perhitungan dan analisa dalam penelitian ini juga bertujuan memberikan gambaran pengaruh penetapan harga jual batubara terhadap eksistensi perusahaan tambang batubara pemegang IUP atau PKP2B sumberdaya alam batubara di wilayah Indonesia pada khususnya.

---

ABSTRACTThe emergence of reference price (HPB) is an important policy in order to reorganize the optimum benefit in the management of coal in Indonesia. Indonesia has the resources and reserves are large enough, the current reserves of about 41 billion tons. While last year's production has reached about 450 million tons that has become the no.1 coal exporting country in the world. Therefore HPB is a policy that is expected to benefit some parties. The offender both producers and consumers have had a fairly clear tools in determining the price of coal is good for spot prices or contracts. As for the government, of course, one of the central concern is the conditions for the establishment of state revenues increasingly clear and transparent. Therefore this research should be conducted to assess the effectiveness of stakes coal price calculation set by the Ministry of Energy through the Director General of Mineral and Coal.In addition, research is conducted for the benefit of the coal mining companies to how to perform their activities in order to survive in the face and anticipate changes in coal price fluctuations and increasingly cenderun decreased. This study uses data observations energy company that operates in one area of ​​the mine in Indonesia. This research is expected to produce a model of computation to determine the effectiveness and economical feasibility in the coal mining business. Model calculations and analysis in this study also aims to provide an overview influence setting the selling price of coal on the existence of a coal mining company IUP holder or PKP2B natural resources of coal in Indonesia in particular. ;he emergence of reference price (HPB) is an important policy in order to reorganize the optimum benefit in the management of coal in Indonesia. Indonesia has the resources and reserves are large enough, the current reserves of about 41 billion tons. While last year's production has reached about 450 million tons that has become the no.1 coal exporting country in the world. Therefore HPB is a policy that is expected to benefit some parties. The offender both producers and consumers have had a fairly clear tools in determining the price of coal is good for spot prices or contracts. As for the government, of course, one of the central concern is the conditions for the establishment of state revenues increasingly clear and transparent. Therefore this research should be conducted to assess the effectiveness of stakes coal price calculation set by the Ministry of Energy through the Director General of Mineral and Coal.In addition, research is conducted for the benefit of the coal mining companies to how to perform their activities in order to survive in the face and anticipate changes in coal price fluctuations and increasingly cenderun decreased. This study uses data observations energy company that operates in one area of ​​the mine in Indonesia. This research is expected to produce a model of computation to determine the effectiveness and economical feasibility in the coal mining business. Model calculations and analysis in this study also aims to provide an overview influence setting the selling price of coal on the existence of a coal mining company IUP holder or PKP2B natural resources of coal in Indonesia in particular. , he emergence of reference price (HPB) is an important policy in order to reorganize the optimum benefit in the management of coal in Indonesia. Indonesia has the resources and reserves are large enough, the current reserves of about 41 billion tons. While last year's production has reached about 450 million tons that has become the no.1 coal exporting country in the world. Therefore HPB is a policy that is expected to benefit some parties. The offender both producers and consumers have had a fairly clear tools in determining the price of coal is good for spot prices or contracts. As for the government, of course, one of the central concern is the conditions for the establishment of state revenues increasingly clear and transparent. Therefore this research should be conducted to assess the effectiveness of stakes coal price calculation set by the Ministry of Energy through the Director General of Mineral and Coal.In addition, research is conducted for the benefit of the coal mining companies to how to perform their activities in order to survive in the face and anticipate changes in coal price fluctuations and increasingly cenderun decreased. This study uses data observations energy company that operates in one area of ​​the mine in Indonesia. This research is expected to produce a model of computation to determine the effectiveness and economical feasibility in the coal mining business. Model calculations and analysis in this study also aims to provide an overview influence setting the selling price of coal on the existence of a coal mining company IUP holder or PKP2B natural resources of coal in Indonesia in particular. ]"

"ABSTRAKUntuk memenuhi kebutuhan energi dalam negeri dan menopang pembangunan nasional, pemerintah Indonesia melakukan eksploitasi sumberdaya alam batubara yang ada di Kalimantan Selatan, bekerjasama dengan PT Adaro Indonesia (PTAI). Selain berdampak positif penambangan batubara PTAI yang dilakukan dengan sistem tambang terbuka (open pit), juga dapat menimbulkan dampak negatif - berupa pengurasan sumberdaya alam, kerusakan dan pencemaran lingkungan yang disebabkan oleh pembuangan limbah cair dengan volume 40,6 juta m3 dengan kadar suspended solid (SS) mencapai 30.000 mg/L (di outlet sump pit sebelum diolah).Pembuangan limbah cair tersebut dapat mengakibatkan pencemaran sungai dan biota akuatiknya. Jika kualitas sungai tercemar, dapat mengakibatkan terganggunya kehidupan, kesehatan dan sosial ekonomi masyarakat yang ada di sekitamya, pada akhimya dapat menimbulkan persepsi negatif terhadap PTAI. Oleh karena PTAI itu telah mempersiapkan suatu sistem pengelolaan air limbah, salah satu diantaranya adalah SISPAL SP-20. Temyata, operasional SISPAL tidak efektif untuk mencegah degradasi kualitas lingkungan. Untuk itu perlu dilakukan penelitian yang komprehensif.Penelitian ini bertujuan untuk: (1) menemukan sistem pengelolaan air limbah tambang batubara terbuka yang efektif untuk mencegah penurunan kualitas lingkungan, (2) mengetahui efektivitas SISPAL SP-20, (3) meningkatkan efektivitas SISPAL SP-20, (4) menemukan jenis dan dosis koagulan-flokulan yang tepat untuk meningkatkan efektivitas SISPAL SP-20, (5) mengetahui upaya minimisasi limbah cair dan menemukan peluang peningkatannya, (6) mengetahui pengaruh operasional PTAI terhadap kualitas sungai dan biota akuatiknya, (7) mengetahui persepsi masyarakat di sekitar tambang terhadap PTAI.Metode penelitian yang digunakan adalah metode eksperimen. Pengumpulan data primer dilakukan dengan survei, pengujian sampel air limbah di laboratorium dengan melakukan serangkaian eksperimen terhadap 5 pasang koagulan dan flokulan dan uji lapangan. Pengumpulan data sekunder didapatkan dari literatur, laporan internal PTAI, buku-buku, brosur, bahan kursus, dan intemet. Studi efektivitas SISPAL SP-20 dilakukan dengan pendekatan teknik, sosio-ekonomi, sumberdaya manusia dan Iingkungan. Penentukan jenis dan dosis koagulan-flokulan yang sesuai dengan karakteristik air limbah tambang PTAI adalah faktor yang besar pengaruhnya untuk meningkatkan efektivitas SISPAL SP-20. Oleh karena itu penentuan jenis dan dosis koagulan-flokulan menjadi prioritas dalam penelitian ini. Dengan penelitian yang komprehensif diharapkan dapat ditemukan suatu sistem pengelolaan air limbah tambang batubara terbuka yang efektif mencegah terjadinya degradasi kualitas Iingkungan.Hasil penelitian yang didapat adalah sebagai berikut:1. Sistem pengelolaan air limbah tambang batubara terbuka PTAI (SISPAL SP-20) tidak efektif mencegah degradasi kualitas Iingkungan. Pada penelitian ini telah ditemukan sistem pengelolaan air limbah tambang batubara terbuka yang efektif dengan menemukan jenis dan dosis koagulan-flokulan, mempersiapkan SOP dan strategi operasi yang tepat dan SDM yang kompeten.2. Pasangan Koagulan Praestol 187-K dan flokulan Praestol 2640 adalah yang terbaik dari 5 (lima) pasang koagulan-flokulan yang diuji.3. Penggunaan koagulan Praestol 187-K dan flokulan Praestol 2640 dengan dosis yang tepat dapat meningkatkan efektivitasnya untuk rnenurunkan kadar SS, Kekeruhan, Fe, Mn sampai 99 %, Sulfat, COD sampai 80%.3.1. Dosis efektif koagulan Praestol 187-K adalah 10 ppm dan flokulan Praestol 2640 adalah 1 ppm dengan kadar S5 air limbah 7.550 mg/I. Biaya penggunaannya sebesar Rp 64 per m3, jika kadar SS air limbah 1.500 mg/l.3.2. Biaya penggunaannya sebesar Rp 64 per m3, jika kadar SS air limbah 1.500 mg/l. Efisiensi yang dapat diperoleh pada SISPAL SP-20 adalah Rp 1,106 milyar per tahun dengan volume air limbah 3,293 juts m3 sedangkan untuk seluruh Tambang Tutupan dapat mencapai Rp 13, 653 milyar per tahun dengan volume air limbah 40, 664 juta m3.4. PTAI telah melakukan berbagai upaya minimisasi limbah cair, tetapi hasilnya belum optimal. Minimisasi limbah cair didapatkan dengan memisahkan air yang keluar dari seepage dan drainhole dengan air limbah di Sump pit yang mengandung S5 tinggi dan memanfaatkan air tersebut untuk kebutuhan rumah tangga. Volume air yang dapat dimanfaatkan adalah 7, 776 juta liter per hari.5. Operasional tambang PTAI mengakibatkan pencemaran sungai di sekitar tambang yang ditunjukkan dengan indeks Shannon-Wiener biota akuatik.6. Operasional PTAI menimbulkan persepsi positif sebesar 64% dan persepsi negatif sebesar 36% oleh masyarakat di sekitar tambang.

---

ABSTRACT

To cope with the domestic energy demand to support our national development, the government of Indonesia continues to exploit its coal resources in South Kalimantan, under the cooperation between the Government of Republic Indonesia and PT Adaro Indonesia (PTAI). The Coal Exploitation by PTAI with open pit methods does not only have positive impact but can also cause negative impact in the forms of depletion of natural resources, environmental damages and water pollution caused by wastewater which discharges 40,6 million m3 and 30.000 mg/I of SS (at the outlet sump pit before treatment).

The discharge of wastewater consequently will pollute the rivers around the mining and endanger the aquatic life. If the water quality of these rivers decreases or is polluted, this will endanger the life of many people, their social and economic as well as their health life and in the end they will forward negative perception to the mining operations. Therefore, this wastewater should be managed by operating of the Open Pit Coal Mining Wastewater Management Systems (SISPAL). One of them is SISPAL SP-20. Unfortunately, the operation of this SISPAL is not effective to protect the degradation of environmental quality. Therefore, it should be improved by comprehensive research.

The objectives of the research are; (1) To formulate an effective open pit coal mining wastewater management systems to protect the degradation of environmental quality, (2) To identify the effectiveness of SISPAL-SP-20, (3) To increase the effectiveness of SISPAL-SP-20 (4) To find the appropriate type and dosage of coagulant-flocculant components to increase the effectiveness of SISPAL¬SP-20, (5) To identify the efforts done by PTAI in minimizing the liquid waste and identify improvement opportunity, (6) To identify the impacts of PTAI operations to the quality of the rivers and their aquatic life, (7) To identify the community perception to PTAI mining operations.

The method being used is experiment. Primary data collection is done through survey, sample testing of waste water conducted in laboratory by executing a number of experimentation of five pairs of coagulant-flocculant and field trial on the SISPAL SP-20. Secondary data collection is done through literature study of PTAI internal reports, books, brochures, magazines, course material and material found in the internet.

This research is conducted by technical, socio-economical, human resources and environmental approaches. The important factors to improve the effectiveness of the SISPAL SP-20 is finding the appropriate types and dosages of the coagulant¬ flocculant components. Therefore, this is the focus of the research. The open pit coal mining wastewater management systems will be found by this comprehensive research.

The research results are;

1. The open pit coal mining wastewater management systems of PTAI (SISPAL SP-20) is not effective to prevent the environment quality degradation. The effective SISPAL can be developed by effective dosage and correct types of coagulant-flocculant, improved SOP and operational strategy, and improved manpower competency.

2. The use of combination of Praestol P-187 coagulant and of Praestol P-2640 flocculant is the best of all 5 (five) combinations of coagulant and flocculant used in this research.

3. The use of combination of Praestol P-187 coagulant and of Praestol P-2640 flocculant with appropriate dosage can increase the effectiveness of the SISPAL SP-20 to decrease the concentration of suspended solid (SS), Turbidity, Iron, Manganese up to 99%, Sulphate and COD up to 80%.

3.1. The effective dosage of coagulant Praestol P-187 is 10 ppm and flocculant Praestol P-2640 is 1 ppm to wastewater which contains 7.550 mg/L of SS. The cost of chemical consumption is about Rp 64 per m3 of wastewater containing of 1.500 mg/L of SS.

3.2. The cost of chemical consumption is about Rp 64 per m3 of wastewater containing of 1.500 mg/L of S5. Total efficiency of SISPAL SP-20 is Rp 1,106 billions per year from 3,293 millions m3 volume of wastewater being processed per year, and the whole efficiency of overall Tutupan mining area with the 40,664 m3 volume of wastewater being processed per year, could reach Rp 13,663 billions.

4. PTAI carries out some efforts to minimize liquid waste, but the result is not optimal yet. There are some opportunities to improve the efforts of liquid waste minimization by segregation of the liquid wastes from drain hole and seepage with wastewater in the Sump pit which contains higher suspended solid. Total volume of water can be conserve and or use for community consumption is 7,776 millions liter/day.

5. The operation of PTAI is pollute the river quality around the mining area shown by Shannon-Wiener index of biota aquatic.

6. The operational of PTAI creates 64% positive perception and 36% negative perception of the community surrounding the mining area."

"Material Potential Acid-Forming (PAF) mine waste batubara yang digunakan sebagai material backfill saat reklamasi tambang dapat membentuk Ait Asam Tambang (AAT) yang memudahkan mobilisasi logam berat dan dapat mencemari air tanah. Abu layang yang berasal dari Pembangkit Listrik Tenaga Uap (PLTU) dikenal dengan kemampuan mentralisasi asam sehingga dapat dimanfaatkan sebagai sebagai chemical liner pada kegiatan reklamasi untuk mencegah pembentukan AAT. Tujuan penelitian ini adalah untuk mengetahui kualitas lindi yang dihasilkan mine waste dengan penambahan abu layang melalui simulasi column leaching test. Penelitian ini menggunakan variasi persentase berat abu layang sebesar 0% (kontrol); 20%; 25%; dan 30%. Hasil penelitian menunjukkan mine waste tanpa penambahan abu layang menghasilkan lindi dengan pH ±3. Nilai pH lindi meningkat dengan penambahan abu layang, dimana persentase abu layang 30% menunjukkan rata-rata nilai pH tertinggi yaitu 6,68. Penambahan abu layang menunjukkan konsentrasi logam Fe, Mn, Zn, Cu, dan Pb pada lindi yang lebih rendah dibadingkan lindi yang berasal dari mine waste saja. Maka berdasarkan hasil penelitian ini abu layang dapat digunakan sebagai material backfill untuk mencegah pembentukan AAT.

---

Potential Acid-Forming (PAF) material in coal mine waste is used as backfill material during mine reclamation and could form Acid Mine Drainage (AMD) which facilitates the mobilization of heavy metals and pollutes groundwater. Fly ash sourced from the Coal-Fired Power Plant (CFPP) is known for its ability to neutralize acids. Therefore, fly ash potential to be used as a chemical liner in reclamation activities to prevent AAT formation. The purpose of this study was to determine the quality of the leachate produced by mine waste with the addition of fly ash through a column leaching test. This study used variations of fly ash weight of 0 w/w% (control); 20% w/w; 25%; and 30% w/w. The results showed that mine waste without the addition of fly ash produced leachate with a pH of ±3. The pH value of leachate increased with the addition of fly ash, where the fly ash 30% w/w showed the highest average pH value (6.68). The addition of fly ash showed that the concentration of Fe, Mn, Zn, Cu, and Pb metals in the leachate was lower than that of the leachate from mine waste alone. Based on the results of this study fly ash could be used as a backfill material to prevent AAT formation."

"Pengolahan air asam tambang dengan metode aktif dilakukan pada kolam pengendapan oleh PT. X. Metode aktif merupakan sistem pengolahan menggunakan bahan kimia alkali untuk menetralkan keasaman air dan mengendapkan padatan tersuspensi. PT. X menggunakan pompa celup dan pompa horizontal, serta pompa pendorong untuk mengeluarkan akumulasi endapan padatan tersuspensi dalam bentuk lumpur di dasar kolam pengendapan. Ketersediaan kinerja pompa celup berada di kisaran < 70%. Hal ini mendorong penulis untuk meninjau kembali nilai hambatan sistem dan titik efisiensi terbaik pompa. Untuk desain debit sebesar 390 m3/jam, nilai head yang dibutuhkan sistem pemompaan kolam BT05 dan kolam BT06 secara berurutan yaitu 34.8255 m dan 139.305 m. Pengurangan jam kerja pompa celup dari 10 jam non stop menjadi 4 jam – 1 jam standby sebanyak 2 siklus, diharapkan dapat mengatasi masalah kelebihan panas yang menjadi penyebab ketersediaan kinerja rendah. Selanjutnya optimasi sistem pemompaan dilakukan dengan perbandingan kombinasi pompa pada masing-masing kolam. Hasil terbaik diperoleh pada pompa celup yang dirangkai seri dengan pompa pendorong pada kolam BT06 dan pompa lumpur horizontal pada kolam BT05. Skema ini menghasilkan total debit lumpur sebesar 880 m3/jam dengan konsentrasi volume 20%. BBM diesel yang dibutuhkan sebesar 136 L/jam, dengan biaya energi sebesar Rp. 1.496.000 per jam, dan potensi penghematan untuk biaya energi per tahun sebesar 3%.

---

Acid mine water treatment with the active method is carried out in the settling pond by PT. X. The active method is a treatment system using alkaline chemicals to neutralize water acidity and precipitate suspended solids. PT. X uses submersible pump and horizontal pump, as well as booster pump to remove the accumulated suspended solids in the form of sludge at the bottom of the settling pond. Submersible pump performance availability is in the <70% range. This encourages the author to review the system resistance value and the best pump efficiency point. For the design discharge of 390 m3/hour, the required head values ​​for the pumping system for the BT05 and the BT06 pond are 34.8255 m and 139.305 m, respectively. Reducing the working hours of submersible pump from 10 hours non-stop to 4 hours - 1 hour standby of 2 cycles is expected to overcome the problem of excess heat which is the cause of low performance availability. Furthermore, the optimization of the pumping system is carried out by comparing the combination of pumps in each pond. The best results were obtained for the submersible pump connected in series with the booster pump in the BT06 pond and the horizontal slurry pump in the BT05 pond. This scheme produces a total sludge discharge of 880 m3/hour with a concentration volume of 20%. Diesel fuel required is 136 L/hour, with an energy cost of Rp. 1,496,000 per hour, and potential savings of 3% annual energy costs.

"