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Implementing the Calculations and Characterization of Underground Coal Gasification using Data Analytic Method Mardhani Riasetiawan; Ferian Anggara; Vanisa Syahra
Civil Engineering Journal Vol 7 (2021): Special Issue "Innovative Strategies in Civil Engineering Grand Challenges"
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-SP2021-07-012

Indonesian coal production nowadays has reached 63% of total production, which means this high demand will also produce a lot of data. This high demand needs to be innovated as a new alternative energy based on coal production, Underground Coal Gasification (UCG). The coal in this alternative energy source is used to turn the solid coal into gas. Coal mining data has a lot of variables that might be difficult to process manually. Our automatic system will help the users, especially the geologists, identify which coal seams have the potential to be developed as the UCG. We developed the system using a python-based coding system and required data standardization to ease the built-in code reading and process all the required steps to identify the UCG. We implemented the calculation and characterization regarding the calorific value (ADB), proximate, and ultimate analysis from the provided data to find the needed variables for the UCG analytics system. The automatic system will allow the user to choose the interesting borehole that they want to identify. Our system then shows the initial UCG recommendation layer for the next analysis. From our experiment, our system finally found that at the depth of 260 meters, Borehole MJ02 has the potential as the initial guest of the recommendation layer of the UCG development. Doi: 10.28991/CEJ-SP2021-07-012 Full Text: PDF

Estimated Emplacement Temperatures for a Pyroclastic Deposits from the Sundoro Volcano, Indonesia, using Charcoal Reflectance Analyses Agung Harijoko; Nanda Ayu Safira Mariska; Ferian Anggara
Indonesian Journal on Geoscience Vol. 5 No. 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.5.1.1-11

DOI: 10.17014/ijog.5.1.1-11This study applies the charcoalification measurement method to infer the emplacement temperature of pyroclastic flow deposits erupted from the Sundoro Volcano, Indonesia. This pyroclastic flow partially covered the Liyangan archeological site, a site where Hindu temples were constructed approximately 1,000 years ago. Five samples of charcoal collected from this area were analyzed for reflectance and elemental composition. Charcoalification temperatures were determined based on mean random optical reflectance values (Ro) plotted on published Ro-Temperature curves. Charcoalification temperatures were also estimated using a published formula based on the charcoal’s hydrogen to carbon (H/C) ratio. These two methods for determining pyroclastic flow deposition temperatures indicated that the pyroclastic deposits that entombed the Liyangan archeological site ranged from 295° to 487°C when they were deposited. This study used very simple, rapid, precise, and low-cost methods of charcoalification temperature measurement to infer the emplacement temperature of a pyroclastic deposit. This estimation procedure could be applied widely to predict emplacement temperatures in volcanic area in Indonesia to enhance volcanic hazard mitigation.

Spatial Variability in Macro- and Microtextures of A Tropical Intermontane Peatland: Preliminary Investigation into The Kutai Lake Peat System, East Kalimantan, Indonesia Ferian Anggara; Guritno Safitri Muchitawati; Tim. A. Moore; Afrina Septantia
Indonesian Journal on Geoscience Vol. 8 No. 2 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.2.275-296

DOI:10.17014/ijog.8.2.275-296Peat deposits of the Muara Siran, East Kalimantan area, were investigated for their vertical and lateral succession, to examine the characteristic variability, particularly its macro- and microtextures. The deposits are situated in the Kutai Basin, in the vicinity of several Cenozoic coal deposits. Peat samples were taken from twenty-seven coring sites in the area, using a MacCaulay peat corer. The Muara Siran peatlands lie between the Kedang Kepala and Belayan Rivers. Siran Lake lies between these rivers and within the peat system. The peat thickness varied from 0.5 m to 12 m. Decomposed sapric peat formed the basal and margins of the deposit, overlain by moderately decomposed hemic peat in the central part of the peatlands, though both sapric and hemic peat types are interbedded at the margins of the mire. The fibric peat types were found mostly at the top of the mire and only distal from any active streams. Twenty-four samples of peat were freeze-dried for petrographic analyses of both plant part and maceral analyses using a reflected microscope. On the average, the dominant plant parts were stems and wood (i.e. secondary xylem). Maceral composition was mostly from the huminite group (on the average 89%), particularly the macerals humodetrinite and textinite. Macroscopic peat type and microscopic composition are linked. Fibric peat was found to be rich in wood and textinite. Hemic was mostly composed of stems and wood with textinite and humodetrinite as the most abundant macerals. Sapric peat has near equal proportions of stems, wood, and macerated tissue. Humodetrinite is the most abundant maceral in sapric. The average ash and sulfur content were low, 1.29 wt.% and 0.11 wt.%, respectively. Understanding the physical characteristics of inland peat as in Muara Siran peatland is essential to build knowledge of how inland peat is formed and what makes it different from coastal peat. Muara Siran is a unique, relatively small peatland in the central eastern Kalimantan which is still considerably pristine, hence may serve the aim of this study well.

Pengaruh penambahan fly ash PLTU Cirebon dan temperatur pengeringan terhadap kuat tekan material konstruksi beton High Volume Fly Ash (HFVA) Anggara, Ferian; Sujoto, Vincent Sutresno Hadi; Tangkas, I Wayan Christ Widhi Herman; Astuti, Widi; Sumardi, Slamet; Putra, Ilham Satria Raditya; Putra, Agik Dwika; Petrus, Himawan Tri Bayu Murti
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.77825

Penggunaaan batubara sebagai sumber energi di negara berkembang seperti Indonesia masih menjadi pilihan utama. Hasil samping pembakaran batubara di Pembangkit Listrik Tenaga Uap (PLTU) berupa fly ash dan bottom ash (FABA) akan terus meningkat seriring konsumsi bataubara sebagai energi meningkat. Industri semen dapat mengahsilkan 2,9 miliar ton CO2 ke atmosfer hal ini akan berdampak langsung terhadap kenaikan temperatur bumi dan pemansan global. Subtitusi material semen dengan fly ash menjadi sebuah pilihan yang ramah lingkungan dalam meminimalisir gas CO2. Pembuatan beton dimulai dengan mencampurkan fly ash dan semen pada berbagai rasio (1:1; 1:3 ; 1:4) dengan air. Air dituang secara bertahap sedikit demi sedikit sambil diaduk hingga membentuk pasta. Pasta beton yang telah terbentuk dicetak pada cetakan kubus ukuran 5x5x5 cm3. Cetakan pasta HVFA didiamkan selama 1 hari, kemudian dikeringkan (curing) pada temperatur yang divariasikan (30, 40 dan 60°C). Hasil Analisa oksida komponen kimia menunjukan bahwa fly ash dari PLTU Cirebon tergolong kategori fly ash kelas C dengan kadar CaO lebih dari 10% dan SiO2 kurang dari 46% dan Kekuatan beton (compressive strength) HVFA yang paling besar yang dapat dihasilkan beton HVFA adalah pada rasio komposisi semen dan fly ash 1:3 dengan temperatur pengeringan 40°C. material fly ash mampu menggantikan semen sebesar 75% dari kebutuhan beton HVFA dengan kekuatan beton mencapai 12,557 MPa pada kondisi pengeringan 40°C. Hasil optimasi menunjukan variable yang paling berpengaruh terhadap kuat tekan beton yang dihasilkan adalah temperatur pengeringan.

Pengaruh penambahan fly ash PLTU Cirebon dan temperatur pengeringan terhadap kuat tekan material konstruksi beton High Volume Fly Ash (HFVA) Anggara, Ferian; Sujoto, Vincent Sutresno Hadi; Tangkas, I Wayan Christ Widhi Herman; Astuti, Widi; Sumardi, Slamet; Putra, Ilham Satria Raditya; Putra, Agik Dwika; Petrus, Himawan Tri Bayu Murti
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.77825

Penggunaaan batubara sebagai sumber energi di negara berkembang seperti Indonesia masih menjadi pilihan utama. Hasil samping pembakaran batubara di Pembangkit Listrik Tenaga Uap (PLTU) berupa fly ash dan bottom ash (FABA) akan terus meningkat seriring konsumsi bataubara sebagai energi meningkat. Industri semen dapat mengahsilkan 2,9 miliar ton CO2 ke atmosfer hal ini akan berdampak langsung terhadap kenaikan temperatur bumi dan pemansan global. Subtitusi material semen dengan fly ash menjadi sebuah pilihan yang ramah lingkungan dalam meminimalisir gas CO2. Pembuatan beton dimulai dengan mencampurkan fly ash dan semen pada berbagai rasio (1:1; 1:3 ; 1:4) dengan air. Air dituang secara bertahap sedikit demi sedikit sambil diaduk hingga membentuk pasta. Pasta beton yang telah terbentuk dicetak pada cetakan kubus ukuran 5x5x5 cm3. Cetakan pasta HVFA didiamkan selama 1 hari, kemudian dikeringkan (curing) pada temperatur yang divariasikan (30, 40 dan 60°C). Hasil Analisa oksida komponen kimia menunjukan bahwa fly ash dari PLTU Cirebon tergolong kategori fly ash kelas C dengan kadar CaO lebih dari 10% dan SiO2 kurang dari 46% dan Kekuatan beton (compressive strength) HVFA yang paling besar yang dapat dihasilkan beton HVFA adalah pada rasio komposisi semen dan fly ash 1:3 dengan temperatur pengeringan 40°C. material fly ash mampu menggantikan semen sebesar 75% dari kebutuhan beton HVFA dengan kekuatan beton mencapai 12,557 MPa pada kondisi pengeringan 40°C. Hasil optimasi menunjukan variable yang paling berpengaruh terhadap kuat tekan beton yang dihasilkan adalah temperatur pengeringan.

Initial Geochemical Assessment of Coaly Source Rocks in Sumatera, Java,and Kalimantan Jyalita, Jasmin; Hendra A, Donatus; Anggara, Ferian
Journal of Applied Geology Vol 8, No 2 (2023)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.72588

In Western Indonesia’s petroleum system, one of the hydrocarbon source rocks was deposited in parallic-deltaic environment with high organic content, categorizing it as coaly source rock. This study focused on geochemical characteristics of 25 coal and coaly shale samples from rock outcrops and well representing the Central Sumatra, South Sumatra, South Central Java, Barito, and Kutai Basin, with additional data from previous studies. TOC analysis and Rock-eval Pyrolysis were carried out to reveal the geochemical characteristics and maturation pathway of the source rock. The TOC analysis results showed a value of 0.5-67.73 wt%, indicating poor-excellent source rock potential. Further rock-eval pirolysis exhibits kerogen type II/II-III (excluding samples from Ngimbang Fm.), with gas-dominated hydrocarbon. Hydrocarbon Index ranging from 4-308 mg/gC indicates possible low-moderate quantity of hydrocarbon that can be generated by the source rocks. Despite the overall fair-good source rock potential, Tmax of the samples indicates a very poor maturity level, with only Upper Talang Akar as the mature candidate. Thus, it can be concluded that young source rock candidates in Western Indonesia (limited to the basins studied in this research) initially possess potential in generating hydrocarbons, if it is not for the immature level of most coaly source rock formations.

Rock Typing Pada Reservoar Gas Upper Eastern View Coal-Measures (EVCM), Cekungan Bass, Australia Dinar Hananto Kurniawan; Sarju Winardi; Ferian Anggara
Lembaran Publikasi Minyak dan Gas Bumi Vol. 56 No. 3 (2022): LPMGB
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Kesulitan terkadang muncul ketka menentukan permeabilitas, terutama pada interval yang tidak memiliki data batuan inti (core). Pada penelitian ini, digunakan teknik sedimentary rock type (SRT) dan petrophysical rock type (PRT) dengan tujuan untuk mengurai permasalahan tersebut. SRT terdapat 4 rock type, yaitu thoroughly bioturbated sandstone and mudstone, fl aser bedded sandstone, laminated sandstone and mudstone, dan thoroughly bioturbated mudstone. Teknik PRT dilakukan dengan mengkomparasikan metode Hydraulic Flow Unit, Global Hydraulic Element, Winland R35, dan Pore Geometry Structure untuk mendapatkan metode yang paling cocok. Hasilnya, metode GHE yang menghasilkan nilai permeabilitas prediksi paling mendekati nilai permabilitas dari data core (koefi sien korelasi 0,9139). Aplikasi metode GHE pada interval yang tidak memiliki data core dilakukan dengan menggunakan data wireline log menghasilkan 4 RT (RT 1, RT 2, RT 3, dan RT 4). Setiap rock type tersebut digunakan rumusan poro-perm transform-nya untuk mementukan nilai permeabilitas. Dipadukan dengan data DST, dapat diambil nilai cut-off , yaitu porositas 0,183, permeabilitas 0,55 mD, volume shale 0,6, dan saturasi air 0,99. Dengan nilai cut-off tersebut menghasilkan satu zona potensial pada kedalaman 2216 mRT - 2234 mRT. Dengan demikian maka manfaat yang didapatkan dari penelitian ini antara lain: mengetahui metode PRT yang cocok diaplikasikan di reservoir ini, jumlah rock type beserta karakteristiknya, serta zona yang potensial.

IDENTIFIKASI KANDUNGAN LITIUM PADA BATUAN FILIT KOMPLEKS LUK ULO, JAWA TENGAH: LITHIUM IDENTIFICATION ON PHYLLITE FROM THE LUK ULO COMPLEX, CENTRAL JAVA Isyqi; Setiawan, Nugroho Imam; Anggara, Ferian
Buletin Sumber Daya Geologi Vol 19 No 2 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i2.470

Production of lithium-ion batteries in Indonesia will be more feasible if Indonesia has its own lithium resources. Metapelitic rocks have the potential to serve as an alternate raw material for lithium. Phyllite, a type of metapelitic rock, was found in the Luk Ulo Complex, Central Java. The objective of this study is to determine the mineral composition and lithium concentration of the phyllite rocks from the Luk Ulo Complex. This will serve as a representative model for understanding the occurrence of lithium in similar rock types. The techniques employed to accomplish this objective include field surveys, petrographic, XRD, and ICP-AES/MS analysis. Phyllite in the Luk Ulo Complex is found in several locations and exhibits well-developed schistosity, characterized by a predominant mineral composition of quartz, graphite, chlorite, and white mica. The concentration of lithium in the phyllite from the Luk Ulo Complex exceeds the average concentration of lithium in the earth's crust, which typically ranges from 18.2 to 84.7 ppm. The presence of lithium in the phyllite rock is believed to be associated with the white mica minerals in the rock because the principal component analysis reveals a significant correlation between the lithium level in phyllite and the major elements K2O, CaO, Na2O, MgO, and Al2O3, which are responsible for the formation of the white mica. The phyllite rocks in the Luk Ulo Complex have a lithium enrichment that is five times more than the concentration of lithium in the earth's crust. It is believed that this enrichment is generated from the protoliths of the phyllite rocks, which are pelitic sedimentary rocks of continental origin. The presence of lithium in the phyllite rocks of the Luk Ulo Complex makes them suitable as lithium sources. However, due to their location within the Karangsambung Geological Reserve Area, these rocks are not to be exploited.

PERHITUNGAN STOK KARBON INORGANIK BATUGAMPING DAN FLUKS KARBON DI KAWASAN BENTANG ALAM KARST (KBAK) TASIKMALAYA, JAWA BARAT Fahrialam, Aldian; Sinabang, Paul Vito Parluhutan; Giwangkara, Atifa Maritza; Gussyak, Selasian; Hidayat, Tantan; Anggara, Ferian; Petrus, Himawan Tri Bayu; Amijaya, Hendra
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 3 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i3.514

ABSTRAKKawasan Bentang Alam Karst (KBAK) merupakan kawasan yang dilindungi dan perlu adanya upaya konservasi untuk mencegah terjadinya pengerukan dan pembukaan lahan secara ilegal. Tercatat, konsentrasi karbondioksida secara global per tahun 2018 mengalami peningkatan hingga 50% dari mulainya revolusi industri dengan konsentrasi sebesar 421 ppm. Tujuan penelitian ini adalah melakukan perhitungan terhadap karbon yang tersimpan di KBAK Tasikmalaya sebagai upaya konservasi terhadap KBAK Tasikmalaya. Perhitungan stok karbon dibagi menjadi dua area. Area utara yang terdiri dari Anggota Sukaraja memiliki stok karbon sebesar 418.528,05 ton dan area selatan yang tersusun atas Formasi Kalipucang memiliki stok karbon sebesar 13 x 106 ton. Besaran nilai dari stok karbon dipengaruhi oleh kadar CaO dalam batugamping serta volume batugamping. Total fluks karbon yang dihasilkan di daerah penelitian mencapai 4,98x1010 mg/hari hingga 9,78x1013 mg/hari dengan rata - rata nilai per sampel 3,16x1011 hingga 2,58x13 mg/hari. Besaran nilai fluks karbon dipengaruhi oleh kadar ion bikarbonat dan nilai debit.Kata kunci: batugamping, fluks karbon, karbon, kars, stok karbonABSTRACTThe Karst Landscape Conservation Area (KBAK) is a protected area that requires conservation efforts to prevent illegal excavation and land clearing. It is noted that the global concentration of carbon dioxide in 2018 increased by up to 50% since the beginning of the industrial revolution, with a concentration of 421 ppm. The purpose of this research is to calculate the carbon stored in KBAK Tasikmalaya as a conservation effort for KBAK Tasikmalaya. Carbon stock calculations are divided into two areas. The northern area, consisting of the Sukaraja Member, has a carbon stock of 418,528.05 tons, and the southern area, consits of the Kalipucang Formation, has a carbon stock of 13 x 106 tons. The magnitude of the carbon stock value is influenced by the CaO content in limestone and the volume of limestone. The total carbon flux generated in the research area ranges from 4,98x10 10 mg/day until 9,78x1013 mg/day , with an average of each sample value ranging from 3,16x1011 to 2,58x13 mg/day. The value of carbon flux is influenced by the bicarbonate ion content and the water discharge value.Keywords: Cox proportional hazard, south and north pacific, climate change, tropical cyclone

Pengaruh parameter operasi terhadap persentase rekoveri litium dari sea water reverse osmosis (SWRO) Anggara, Ferian; Sujoto, Vincent Sutresno Hadi; Astuti, Widi; Sumardi, Slamet; Putra, Ilham Satria Raditya; Putra, Agik Dwika; Petrus, Himawan Tri Bayu Murti
Jurnal Rekayasa Proses Vol 18 No 1 (2024): Volume 18, Number 1, 2024
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.79556

Konsentrasi litium dalam sea water reverse osmosis (SWRO) terhitung masih kecil dibandingkan dengan sumber konvensional. Tren penggunaan air laut di dunia diperkirakan naik untuk tahun-tahun mendatang. Tujuan dari penelitian ini adalah untuk mengekstrak litium dari limbah cair SWRO. Bahan yang digunakan adalah limbah cair SWRO yang berasal dari PT. Cirebon Electric Power. Tahap awal yang perlu dilakukan adalah proses evaporasi. Proses evaporasi dilakukan pada temperatur 90°C. Proses evaporasi bertujuan untuk memekatkan atau mengkonsentrasikan mineral tertentu. Pada tahapan ini persentase penguapan divariasikan (70, 80, dan 90%). Proses presipitasi dilakukan dengan menggunakan bantuan natrium karbonat (Na2CO3). Tahap awal adalah pembuatan larutan Na2CO3 3 Molar. 250 mL larutan hasil evaporasi disiapkan dan dipanaskan pada berbagai variasi temperatur (70, 80, dan 90 °C). Analisa tersebut juga menunjukkan kecenderungan semakin meningkatnya persentase rekoveri yang sejalan dengan meningkatnya persentase penguapan. Meskipun dampaknya kecil, temperatur presipitasi juga memberikan dampak dalam proses persentase rekoveri litium. Kondisi terbaik di dalam penelitian ini adalah pada persentase penguapan 90% dengan temperatur presipitasi 90 °C dengan persentase rekoveri mencapai lebih dari 70%.

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