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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Maswah, Fauziah Suryantini Srigutomo, Wahyu Fajri, Reza Jamil Pratama, Angga Bakti Pratomo, Prihandhanu M. Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Jalan Ganesha no. 10 West Java Bandung40132 Indonesia Jalan Warung Buncit Raya No. 75 South Jakarta Indonesia

The magnetotelluric (MT) method is passive geophysical method that measures natural electromagnetic field to estimate the subsurface resistivity structure. Before conducting 2D MT data inversion, data analysis, dimensionality, including determining the direction of the geoelectrical strike must be performed. It is needed to fulfill the assumption of 2D MT modeling. 2D modeling of magnetotelluric data is an important part because the results can determine the quality of the subsurface interpretation. Therefore, this paper describes the determination of the dimensonality and geoelectrical strike using the phase tensor and tipper strike parameters. The invariant parameters of phase tensor including skew angle (β) and ellipticity are used to get the information about the dimensionality and geoelectrical strike. The results from the phase tensor are plotted in a rose diagram to determine the main direction of the geoelectrical strike. The phase tensor analysis contains ambiguity 90°, therefore tipper strike used to validate the analysis. From the analysis, the result shows the 1D or 2D structures of the MT data in high frequency, meanwhile the lower frequency, the majority of the data show 3D structures. The dominant geoelectrical strike is around N15°E and it is confirmed with the regional structure of the area. Determination of dimensionality and geoelectrical strike are applied to MT data from the geothermal field. © Published under licence by IOP Publishing Ltd.

关键词： Tensors

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Technical, Economic and Environmental Analysis of the Carbon Capture and Use Plant Using Gases from a Steelmaking Process: A Case Study with a Gas Turbine

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SSRN 2023年

作者： Ribeiro, Natália Leal, Elisângela Martins Graduate Program in Mechanical Engineering -PROPEM Campus Morro do Cruzeiro s/n Bauxita MG Ouro Preto35400-000 Brazil Department of Mechanical Engineering School of Mining Federal University of Ouro Preto Campus Morro do Cruzeiro s/n Bauxita MG Ouro Preto35400-000 Brazil

O presente trabalho tem como objetivo analisar uma planta de captação e aproveitamento de carbono dos gases de exaustão de um processo siderúrgico para sua conversão em combustíveis de interesse. O software Chemical Equilibrium with Applications é utilizado para analisar o comportamento das frações molares do gás de síntese no reator de deslocamento água-gás e reator Fischer Tropsch. A melhor faixa de parâmetros operacionais é de 200 a 250ºC, 4,5 MPa, e 2,0 para relação H2/CO2. Posteriormente, é realizado um estudo da cinética e influência do reator adiabático de fluxo em fluxo e do catalisador comercial Cu/ZnO/Al2O3 na síntese de Fischer Tropsch para a formação de metanol e etanol. Observa-se que, para a conversão em metanol, quanto maior a relação H2/CO2, maior a formação deste produto e menor a geração de CO2. Para o etanol, pode-se observar que as frações deste combustível e de CO2 diminuem com o aumento da relação H2/CO2. Por fim, é realizado um estudo de caso contendo as análises exergoeconômicas e exergoambientais de uma turbina a gás movida a metanol. O menor rendimento exergético obtido no ciclo em análise é o do compressor (27,02%) enquanto o maior valor é apresentado pela câmara de combustão (48,63%). O menor valor do fator exergoeconômico é apresentado pela câmara de combustão. A turbina é o componente que possui maior índice de impacto ambiental, enquanto a câmara de combustão é o equipamento que demonstra maior facilidade em reduzir esse tipo de impacto. © 2023, The Authors. All rights reserved.

关键词： Gases

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Evaluating the Water Quality Contribution of Estero de Paco to Pasig River and Manila Bay, Philippines 6

Evaluating the Water Quality Contribution of Estero de Paco ...

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6th Environmental Technology and Management Conference, ETMC 2019

作者： Clemente, Eligia D. Environmental Engineering Program University of the Philippines Diliman Quezon City1101 Philippines Department of Mining Metallurgical and Materials Engineering University of the Philippines Diliman1101 QC Philippines

The clean-up of the river system feeding into Manila Bay is crucial in addressing the current Manila Bay water quality. Since Estero de Paco is a feeder into Pasig River which enters the Manila Bay, its clean-up is imperative to sustain Manila Bay water quality. This research gathered information on the water quality Estero during both the dry and the wet season. Initial survey of the stretch showed that there are bridges and residential areas as potential sampling points. Using the Streeter-Phelps model an assessment of the water quality during different meteorological conditions shows that almost no DO is available during the dry season, while some have a DO > 5 mg/l (standard) during the rainy season. Unfortunately, based on the other critical parameters, Biochemical Oxygen Demand (BOD) was high due to discharge of septic waste directly into the river during the heavy rains. Sludge near populated areas were characterized and found to contain high levels of Oil & Grease, Organic Matter. The Streeter-Phelps equation used to evaluate the oxygen deficit shows that at the Pasig River junction DO is negligible even during the wet season. It is recommended that regular monitoring and community engagement be actively pursued. © 2020 The Authors, published by EDP Sciences.

关键词： Water quality

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Thermal Stability of Copper Processed by Multidirectional Forging Effect of Deformation Amplitude and Cumulative Strain

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SSRN 2022年

作者： Flausino, Paula Cibely Alves Corrêa, Elaine Carballo Siqueira Pereira, Pedro Henrique Rodrigues Aguilar, Maria Teresa Paulino Cetlin, Paulo Roberto Graduate Program in Metallurgical Materials and Mining Engineering UFMG Brazil Dept of Metallurgical and Materials Engineering UFOP Brazil Department of Materials Engineering CEFET-MG Brazil Dept of Metallurgical and Materials Engineering UFMG Brazil Dept of Construction and Materials UFMG Brazil Dept of Mechanical Engineering UFMG Brazil

Experiments were performed in order to evaluate the effect of deformation amplitude (∆Ε) and cumulative strain (Ε) on the thermal stability of Copper 99.8% pure, after processing with 8 and 48 Multidirectional forging (MDF) cycles at room temperature with ∆Ε ≈ 0.075 (MDF0.075) or 2 and 12 MDF cycles with ∆Ε ≈ 0.30 (MDF0.30), leading to cumulative deformations of Ε ≈ 1.8 and 10.8. The microstructural stability at elevated temperatures was evaluated through Differential Scanning Calorimetry (DSC) and heat treatments, combined with Vickers microhardness measurements and Electron Backscattered Diffraction (EBSD). Further analyses were carried out through thermodynamic considerations about the stored energy and driving pressures for boundary migration. The results showed that the thermal stability associated with static recrystallization decreases as Ε and ΔΕ in MDF increase, due to the presence of finer grain structures and higher dislocation density in the as-deformed material. In addition, the MDF-processed specimens deformed with high Ε and ΔΕ exhibited finer recrystallized grains than those processed with low Ε and ΔΕ as a result of their increased number of nucleation sites. Thermal stability increases in the following order: 12C-MDF0.30, 2C-MDF0.30, 48C-MDF0.075 and 8C-MDF0.075 © 2022, The Authors. All rights reserved.

关键词： Copper

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Coal Structure: Visualizing Micropore Distributions Through Hierarchical 3D Pore Modeling for a Bituminous Coal 38

Coal Structure: Visualizing Micropore Distributions Through ...

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38th Annual International Pittsburgh Coal Conference 2021: Clean Coal-based Energy/Fuels and the Environment, PCC 2021

作者： Lu, Guanwen Watson, Justin K. Mathews, Jonathan P. Leone Family Department of Energy and Mineral Engineering The EMS Energy Institute Pennsylvania State University University ParkPA16802 United States China University of Mining & Technology Xuzhou221008 China Department of Material Science and Engineeing Nuclear Engineering Program Florida University GainesvilleFL32661 United States

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Synthesis, Characterization, and performance test of modified Zeolite-Si/Al nanocomposite from pumice and waste cans using slow pyrolysis process for removal pollutant parameters from hard water

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Environmental Nanotechnology, Monitoring and Management 2023年 20卷

作者： Gusti Wibowo, Yudha Sudibyo Rianjanu, Aditya Taher, Tarmizi Susanti, Noni Karo Karo, Pulung Suprihatin Iman Supriyatna, Yayat Prasetyo, Erik Bahfie, Fathan Amin, Muhammad Syarifuddin, Hutwan Safitri, Hana Khairurrijal, Khairurrijal Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Research Center for Mining Technology National Research and Innovation Agency Lampung Indonesia Department of Material Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Environmental Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Physics Department Universitas Lampung Lampung Indonesia Department of Environmental Science Postgraduate Program Universitas Jambi Jambi 36122 Indonesia Laboratory of Mine Environmental Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Physics Institut Teknologi Sumatera Lampung-36365 Indonesia Department of Physics Institut Teknologi Bandung Bandung 40132 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Indonesia

Hard water is one of crucial problems in the world due to its pollutant parameters. Adsorption is a promising method for treating hard water because of its benefits such as low-cost, easy to use, acceptable, and easy to maintenance. In this study, we utilized zeolite functionalized with silicon/aluminum (Ze-Si/Al) as adsorbent materials for hard water treatment. Ten different ratios of Si/Al were added into zeolite by modifying the solid waste source concentration (pumice and cans). The optimum sample was then further tested with different parameters including contact time, dye concentration, and isotherm models. The zeolite-Si/Al adsorbent was characterized by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF). Results of this study have showed that the best functionalized zeolite was that with Si/Al ratio 0.67, which has higher sorption ability. In contact time test, the equilibrium was reached after 300 min. This study also informed that the concentration of dyes will give impact on removal of pollutant parameters. Isotherm model of Ze-Si/Al fitted with Langmuir method. This study also discussed the potential development and future research direction. Thus, this study is a crucial report to develop the information about waste utilization as source of Si/Al to increasing quality of zeolite. © 2023 Elsevier B.V.

关键词： Adsorption Hard water Wastewater Wastewater treatment zeolite-Si/Al

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Coal quality analysis at CV Bara Mitra Kencana Sawahlunto West Sumatera

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AIP Conference Proceedings 2024年第1期3001卷

作者： Heri Prabowo Eri Barlian Nurhasan Syah Deni Riski Ramadan Department of Environmental Science Program Universitas Negeri Padang Padang Indonesia Department of Mining Engineering Universitas Negeri Padang Padang Indonesia

One of the main parameters that determine the processing and utilization of coal mining is the quality of the coal. This research was conducted to determine the quality of coal based on proximate, sulfur, and calorie analysis with ASTM standards. Coal sampling was carried out at three different layers at CV. Bara Mitra Kencana. In suture sample 1 with the basic results dry air Total moisture 22.08%, Ash 62.25%, Moisture in 7.48%, Volatile matter 23.91%, Total sulfur 0.8%, Fixed carbon 6.36%, Calorific Value 2155.77 KCal / Kg. In suture sample 2 with the basic results dry air Total humidity 14.64%, Ash 6.29%, Humidity 6.48%, Volatile 37.45%, total sulfur 0.37%, fixed carbon 49.78%, Calorific value 7336 KCal / Kg. Inseam sample 3 with the basic results dry air Total humidity 9.71%, ash 2.84%, humidity 4.57%, volatile material 41.87%, total sulfur 0.32%, fixed carbon 50.72%, Calorific value 8207 KCal / Kg. It can be concluded that seam 1 samples include very low-quality coals and seam 2 and seam 3 samples include high-quality coals. low has a low calorific value. Meanwhile, the effect of carbon shows that the lower the carbon content of coal, the lower the heating value of coal.

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Evaluating factors influencing community readiness for post-mining environmental development strategies

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Journal of Environmental Management 2024年 366卷 121823页

作者： Sutrisno, Agung Dwi Lee, Chun-Hung Suhardono, Sapta Suryawan, I Wayan Koko Department of Mining Engineering Institut Teknologi Nasional Jl. Babarsari Caturtunggal Depok Sleman Yogyakarta55281 Indonesia Department of Natural Resources and Environmental Studies College of Environmental Studies and Oceanography National Dong Hwa University Hualien97401 Taiwan Environmental Sciences Study Program Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Surakarta57126 Indonesia Department of Environmental Engineering Faculty of Infrastructure Planning Universitas Pertamina Jalan Sinabung II Terusan Simprug Jakarta12220 Indonesia

This research delves into the complex factors that affect how ready a community is to embrace new environmental development strategies, which could significantly change the region's social and economic fabric. Using a structured questionnaire, exploratory factor analysis and logistic regression analysis, the study assesses how corporate practices in resource management, environmental governance, efforts to enhance community capabilities, and various demographic factors influence the community's willingness to adapt to change. Despite its intentions to benefit both the mining operations and the community, corporate resource management appears to have a paradoxical impact on the community's willingness to pursue new environmental paths. This negative impact can be attributed to the dependency it creates. Effective corporate resource management can lead to a community becoming heavily reliant on the stability and benefits provided by the mining company. This dependency fosters a sense of security and satisfaction with the status quo, making community members less inclined to explore or support new and potentially disruptive environmental strategies. The stability provided by the mine's resource management practices may inadvertently anchor the community to existing economic structures, reducing their impetus to seek alternative livelihoods or adapt to new socioeconomic conditions. However, it is essential to consider the limitations of this finding. One limitation is the potential bias in community perceptions, where immediate benefits from corporate resource management overshadow long-term considerations for sustainable development. Additionally, the context-specific nature of this study means that these findings may not be universally applicable to all mining communities. © 2024 Elsevier Ltd

关键词： mining

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Combining magnet-assisted soil washing and soil amendment with zero-valent iron to restore safe rice cultivation in real cadmium-contaminated paddy fields

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Chemosphere 2023年 340卷 139816页

作者： Khum-in, Vinita Suk-in, Jirapon In-ai, Papop Piaowan, Kitsanateen Praimeesub, Yarnnapat Rintachai, Kusuma Supanpaiboon, Wisa Phenrat, Tanapon Department of Civil Engineering Faculty of Engineering Rajamangala University of Technology Thanyaburi Pathumthani 12110 Thailand Department of Civil Engineering Faculty of Engineering Naresuan University Phitsanulok65000 Thailand Faculty of Engineering Naresuan University Phitsanulok65000 Thailand Information and Research Center for Mae Tao Watershed Development Tak Province Mae Sot Thailand Naresuan University Faculty of Medical Science Phitsanulok65000 Thailand Research Program of Toxic Substance Management in the Mining Industry Center of Excellence on Hazardous Substance Management Chulalongkorn University Bangkok10330 Thailand

Local villagers in Mae Sot District, Tak Province, Thailand are at risk of diseases related to cadmium (Cd) due to excessive consumption of rice contaminated with Cd due to zinc mining. This study verifies the hypothesis that to achieve safe rice cultivation, magnet-assisted soil washing followed by soil amendment using zero-valent iron (ZVI) is required not only for rapid remediation of the existing Cd contamination but also for the prevention of Cd recontamination caused by contaminated run-off from an upgradient contaminated paddy. Accordingly, this study conducted a pilot-scale demonstration of the combined technique to restore a real Cd-contaminated paddy (41.02 ± 5.47 mg/kg−1) and compared it with remediation using only soil amendment with ZVI or only magnet-assisted soil washing. The Cd concentration in rice grains from the contaminated rice field without treatment was 0.86 ± 0.01 mg/kg−1, and thus higher than the acceptable level of 0.4 mg/kg−1. Even though the use of magnet-assisted soil washing without amendment initially removed all the bioavailable Cd from the soil, it failed to reduce Cd uptake by the rice plants. This failure was caused by heavy off-season rain, which flooded and re-contaminated the experimental fields with Cd-contaminated run-off from an upgradient contaminated field, leading to a Cd concentration in rice grains of 1.21 ± 0.01 mg/kg−1. Similarly, the use of ZVI as a soil amendment without magnet-assisted soil washing could not ensure safe rice cultivation during the off-season flood, as Cd concentration in the rice grains was still 0.60 mg/kg−1. However, magnet-assisted soil washing followed by soil amendment using ZVI successfully removed Cd from soil and sequestered Cd from Cd-contaminated run-off, resulting in protection against Cd re-contamination in soil and the reduction of Cd content in rice grains to 0.33 mg/kg−1, representing a 60% removal efficacy. Also, this combined technique remained positive for rice growth compared to n

关键词： Food safety

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Lithium adsorption behaviour from Ciseeng geothermal brine water onto Amberlite resin

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AIP Conference Proceedings 2024年第1期3003卷

作者： Ariyo Suharyanto Miftakhur Rohmah Latifa Hanum Lalasari Mohammad Zaki Mubarok Research Center for Metallurgy National Research and Innovation Agency South Tangerang 15314 Banten Indonesia. Doctoral Program of Mining Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia. Department of Metallurgical Engineering Institut Teknologi Bandung Indonesia Faculty of Mining and Petroleum Engineering Jl. Ganesha 10 Bandung 40132 Jawa Barat Indonesia.

Lithium extraction from geothermal brines has recently become a strong interest due to the large volume of lithium resources in over 2000 geothermal wells and hot springs worldwide. This article discusses the adsorption behavior of lithium contained in local geothermal brine water originating from the Ciseeng geothermal field in Bogor Regency, West Java Province of Indonesia, by Amberlite IR-120 Na resin. The lithium uptake and the selectivity of lithium adsorption by Amberlite IR 120 Na resin towards alkaline and alkaline earth elements contained in the geothermal brine samples, the equilibrium behavior, and adsorption kinetics were studied. The experimental results show that lithium adsorption increased by the increase in contact time of brine water and Amberlite IR 120 in 4-day continuous adsorption and reached a maximum level at day-3 to 0.0356 mmol/g Li. Li adsorption decreased after day-3, indicating that the Li adsorption had reached an equilibrium state at day-3. The highest adsorption recovery during 4-day continuous adsorption is exhibited by K, followed by Li, Na, Ca, and Mg. Considering a low adsorption percentage of Li (maximum 36.6%) but still higher than that of Ca, Mg, and Na, the adsorption parameters are still to be improved. Linear fitting of the experimental data on the four different isotherm adsorption models indicated that the lithium adsorption from Ciseeng brine fit mostly with Freundlich and Temkin model with an adsorption capacity of the Amberlite IR 120 of 0.051 mg/g. Based on the linear fitting procedure of the experimental data to four different kinetics models, the lithium adsorption from Ciseeng brine onto Amberlite resin follows the Elovich kinetic model (R2 = 0.986), which indicates the dominant chemisorption mechanism in the lithium adsorption process.

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