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Removal of total dissolved solids from oil-field-produced water using ceramic adsorbents integrated with reverse osmosis

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Materials Today: Proceedings 2023年 87卷 360-365页

作者： Herawati N. Dahlan M.H. Yusuf M. Iqbal M.M. Roni K.A. Nasir S. Doctoral Engineering Program Faculty of Engineering Universitas Sriwijaya Jl. Srijaya Negara Palembang 30139 Indonesia Chemical Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Palembang Jl. Jend. A. Yani 13 Ulu Plaju Palembang 30137 Indonesia Chemical Engineering Department Faculty of Engineering Universitas Sriwijaya Jl. Raya-Palembang Prabumulih Ogan Ilir 30662 Indonesia Mining Engineering Department Faculty of Engineering Universitas Sriwijaya Jl. Raya-Palembang Prabumulih Ogan Ilir 30662 Indonesia Civil Engineering Department Faculty of Engineering Universitas Sriwijaya Jl. Raya-Palembang Prabumulih Ogan Ilir 30662 Indonesia

Total dissolved solids (TDS) consisting of inorganic salts and organic matter are pollutants to the aquatic and water systems for human use. This paper studied the effect of ceramic adsorbent composition on improving the quality of the produced water (PW) by decreasing TDS before entering reverse osmosis (RO). Manufacturing ceramic adsorbents use a mixture of spent catalysts of residues catalytic cracking (RCC) and natural clay in various compositions. Experiments were performed using the PW from one oil and gas company in South Sumatra, Indonesia. The initial characterization of produced water contains total dissolved solids of 14,556 mg/L. The flow rate of PW into the ceramic adsorbent column were varied from 6 to 8 L/min at a contact time of 15 to 120 min. The results showed that ceramic adsorbent A (diameter 10 mm and thickness 10 mm, 70% clay, and 30% RCC) reduced TDS by 74.58%. Adsorbent B (diameter of 20 mm and thickness of 10 mm, 70% RCC and 30% clay) lowers TDS by 56.68% at a flow rate of 6 L/min and a contact time of 60 min. Adsorbent C (diameter of 10 mm and thickness of 10 mm, 30% clay, and 70% RCC) reduced TDS by 59.40% at a flow rate of 6 L/min and a flow time of 60 min. Adsorbent D (diameter of 20 mm, thickness of 10 mm, 30% clay, and 70% RCC) lowers TDS by 54.38% at a flow rate of 6 L/ min and a contact time of 60 min. After being transferred into the adsorption column, their filtrates were sent into the Reverse Osmosis (RO) membrane. The final permeates of RO have TDS values between 1,720 mg/L to 3,930 mg/L that met water standards for oil and gas exploration wastewater in Indonesia. © 2023 The Authors. All rights reserved.

关键词： Adsorbent Adsorption Catalytic cracking Residues from oil exploration Total dissolved solids

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Features engineering and Features Extraction of Volcano-Tectonic (VT) Earthquake 9

Features Engineering and Features Extraction of Volcano-Tect...

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9th Asian Physics Symposium 2021, APS 2021

作者： Martanto, Martanto Nugraha, Andri Dian Sahara, David P. Syahbana, Devy Kamil Rahsetyo, Puput P. Priambodo, Imam C. Ardianto, Ardianto Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung Indonesia Center for Volcanology and Geological Hazards Mitigation Geological Agency Ministry of Energy and Mineral Resources Indonesia

A volcano-Tectonic earthquake, commonly referred to as VT, is an earthquake caused by magma intrusion that increases the pressure below the volcano's surface. The accumulation of stress that continuously affects the elasticity of rocks causes fractures when the elasticity limit of rocks is exceeded. VT is one of the earthquakes used as a parameter to decide the level of volcanic activity. To understand the characteristics of VT, it is necessary to do features engineering, which is a process of extracting features so that the characteristics of VT are obtained. The data used in this study was the VT earthquake when Agung was in crisis in 2017. The extraction process is conducted by performing statistics calculations in temporal and spectral domains. The waveform of VT is univariate time series data, and to perform the extraction of features, this study uses changes in amplitude value to the time taken from the waveform. Features that were successfully extracted from this study are as many as 48 features. The result of the extraction of these features can be used as input parameters in performing auto-classification of VT using machine learning. © Published under licence by IOP Publishing Ltd.

关键词： Volcanoes

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A Preliminary Result of Seismic Hazard Analysis in Eastern Part of Bali Island, Indonesia 9

A Preliminary Result of Seismic Hazard Analysis in Eastern P...

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9th Asian Physics Symposium 2021, APS 2021

作者： Priambodo, Imam Catur Zulfakriza Solikhin, Akhmad Cipta, Athanasius Martanto Ardianto Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung Indonesia Geological Agency Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung Indonesia Center for Earthquake Science and Technology Institut Teknologi Bandung Bandung Indonesia

Bali Island is one of the main tourist destinations in Indonesia. However, Bali Island is also prone to earthquakes, as evidenced by several historical destructive earthquakes, especially in the eastern part of Bali. A probabilistic seismic hazard modeling is undertaken to analyse the earthquake hazard, as well as studying the contribution of local geological conditions to earthquake ground motion. We use seismic waveforms retrieved from 23 temporary seismic stations across the eastern part of Bali Island from December 2018 to June 2019 and 5 permanent seismic stations around Mount Agung and Batur. The recording data were processed using the Horizontal to Vertical Spectral Ratio (HVSR) method. Our preliminary result shows local geological conditions for each station, represented by the value of the average shear-wave velocity on rocks to a depth of 30 meters (Vs30) and the total thickness of sediments above the bedrock (basin depth). These initial results will then be developed as site parameter input for probabilistic seismic hazard analysis in the eastern part of Bali. © Published under licence by IOP Publishing Ltd.

关键词： Shear flow

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Continuous Two-Zone In Vitro Co-culture Model of the Enthesis

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Biomedical Materials and Devices 2023年第1期1卷 541-550页

作者： Park, Hyeree Cooke, Megan E. Lacombe, Jean-Gabriel Weber, Michael H. Martineau, Paul A. Nazhat, Showan N. Rosenzweig, Derek H. Department of Mining and Materials Engineering McGill University Montreal Canada Department of Experimental Surgery McGill University Montreal Canada Injury Repair and Recovery Program Research Institute of McGill University Health Centre Montreal Canada Division of Orthopaedic Surgery McGill University Montreal Canada

The enthesis is the interfacial tissue between ligament or tendon, and bone, which connects tissues of distinctly different mechanical properties. Although ligament and enthesis injury is commonplace, the development and healing mechanisms of these tissues are yet unclear. Current models for investigating these mechanisms are primarily in vivo animal models as in vitro models have been limited in their structural and mechanical biomimicry of the native enthesis. In this study, an in vitro enthesis model was developed using a modified gel aspiration-ejection method. Continuous two-zone aligned dense collagen (ADC) hydrogels with an overlapping interface were fabricated within 2 h. The mechanical properties of acellular two-zone ADC confirmed the continuous nature of this model, as the mechanical properties showed no significant difference compared to single-zone ADC and maintained comparable structural and mechanical characteristics of immature ligaments and unmineralized bone. Human anterior cruciate ligament fibroblasts and human spine vertebral osteoblasts were isolated from donor tissues and were seeded to form the enthesis model. These were cultured for 14 days, at which the viability and proliferation was observed to be 85 ± 7.5% and 230 ± 52%, respectively. Histological and immunofluorescence analyses at day 14 revealed extensive cell-driven matrix remodelling, and the seeded fibroblasts and osteoblasts maintained their phenotype within their compartments of the layered co-culture model. These results demonstrate the rapid fabrication of a two-zone co-culture system that can be utilized as an in vitro model to further understand the degenerative and regenerative mechanisms within the enthesis. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC 2022.

关键词： Anisotropy Bone Hydrogel In vitro model Ligament Tendon

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Removal of total dissolved solids from oil-field-produced water using ceramic adsorbents integrated with reverse osmosis

Removal of total dissolved solids from oil-field-produced wa...

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3rd International Conference on Chemical engineering and Applied Sciences, ICChEAS 2022

作者： Herawati, Netty Hatta Dahlan, Muhammad Yusuf, Maulana Iqbal, Maulid M. Ahmad Roni, Kiagus Nasir, Subriyer Doctoral Engineering Program Faculty of Engineering Universitas Sriwijaya Jl. Srijaya Negara Palembang30139 Indonesia Chemical Engineering Department Faculty of Engineering Universitas Sriwijaya Jl. Raya-Palembang Prabumulih Ogan Ilir30662 Indonesia Mining Engineering Department Faculty of Engineering Universitas Sriwijaya Jl. Raya-Palembang Prabumulih Ogan Ilir30662 Indonesia Civil Engineering Department Faculty of Engineering Universitas Sriwijaya Jl. Raya-Palembang Prabumulih Ogan Ilir30662 Indonesia Chemical Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Palembang Jl. Jend. A. Yani 13 Ulu Plaju Palembang30137 Indonesia

关键词： Produced Water

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Post-Traumatic stress disorder and post-traumatic growth in firefighters: examining the moderating effects of resilience on occupational safety behaviors

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BMC Public Health 2025年第1期25卷 1-15页

作者： Bakirci, Ahmet Erhan Demirel, Nuray Sar, Vedat Cetin, Ali Department of Civil Defense and Firefighting Vocational School of Technical Science Cerrahpasa University-Istanbul Istanbul Turkey Mining Engineering Occupational Health and Safety Interdisciplinary Program Middle East Technical University Ankara Turkey Department of Psychiatry Koc University Faculty of Medicine Istanbul Turkey Department of Obstetrics and Gynecology Haseki Training and Research Hospital University of Health Sciences Istanbul Turkey

Background: Posttraumatic stress disorder (PTSD) and posttraumatic growth (PTG) represent divergent outcomes following trauma exposure in high-risk professions. This investigation examined the complex interplay between PTSD, PTG, and resilience in relation to occupational safety behaviors among Turkish firefighters. Methods: A multi-site cross-sectional study was conducted across five metropolitan fire departments in Turkey (N = 122). Participants completed validated psychometric instruments including the PTSD Checklist for DSM-5 (PCL-5), Posttraumatic Growth Inventory-Expanded Form (PTGI-X), Brief Resilience Scale, alongside detailed evaluations of safety practices, perceptions, and behaviors that assessed protocol adherence, equipment maintenance, training attendance, and safety communication metrics. Hierarchical multiple regression and chi-square analyses examined the relationships between psychological factors and safety outcomes, with particular attention to moderating effects. Results: Analyses revealed significant associations between psychological adaptation patterns and safety-critical behaviors. PTSD symptomatology demonstrated negative correlations with safety protocol adherence (r=-.24, p <.01) and safety awareness (r=-.21, p <.01). PTG manifested distinct cultural patterns, with Personal Strength emerging as the predominant domain (M = 3.10, SD = 1.08). A distinct disparity emerged between technical and psychological safety dimensions, with high adherence to equipment-related protocols (breathing apparatus maintenance: M = 4.00) contrasting markedly with poor implementation of psychological safety practices (comfort in communicating safety concerns: M = 1.66). Regression analyses indicated that psychological factors accounted for 28% of the variance in safety performance metrics, with resilience moderating the relationship between PTSD symptomatology and safety outcomes. Conclusions: This investigation identifies critical relationships between psycholo

关键词： Emergency services Firefighters Occupational safety Posttraumatic growth Posttraumatic stress disorder Psychological resilience

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Whale Optimization Algorithm for structural damage detection, localization, and quantification

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Discover Civil engineering 2024年第1期1卷 1-22页

作者： Monteiro, Daniele Kauctz Miguel, Letícia Fleck Fadel Zeni, Gustavo Becker, Tiago de Andrade, Giovanni Souza de Barros, Rodrigo Rodrigues Graduate Program in Civil Engineering (PPGEC) Federal University of Rio Grande Do Sul (UFRGS) Porto Alegre Brazil Department of Mechanical Engineering (DEMEC) Graduate Program in Mechanical Engineering (PROMEC) Graduate Program in Civil Engineering (PPGEC) Federal University of Rio Grande Do Sul (UFRGS) Porto Alegre Brazil Graduate Program in Mining Metallurgy and Materials Engineering (PPGEM) Federal University of Rio Grande Do Sul (UFRGS) Porto Alegre Brazil Department of Mechanical Engineering (DEMEC) Federal University of Rio Grande Do Sul (UFRGS) Porto Alegre Brazil Applied Mechanics Group (GMAp) School of Engineering Federal University of Rio Grande Do Sul (UFRGS) Porto Alegre Brazil

This paper introduces an approach for vibration-based damage detection based on matrix updating aided by the Whale Optimization Algorithm (WOA). The methodology uses the Data-driven Stochastic Subspace Identification (SSI-DATA) technique to determine the modal parameters, which are compared with those obtained from both healthy and damaged conditions of the structure. The methodology’s efficacy is assessed through three distinct steps: numerical simulations, experimental data, and real-world data from a bridge. Initially, numerical analyses are conducted on a cantilever beam, a 10-bar truss, and a Warren truss subjected to environmental vibrations with varying damage cases and noise levels. Subsequently, experimental validations are performed on a test system and in the Z24 Bridge. Results from the computational simulations demonstrate the method’s promise to identify, locate, and quantify single and multiple damage cases, even amidst signal noise, variations in the first vibration mode as minimal as 0.015%, and complex structures with 54 elements. Moreover, the matrix updating method utilizing WOA showcased superior accuracy compared to existing techniques in the literature. In addition, the Z24 Bridge example validated the capability of the presented damage detection method to localize structural damage solely based on natural frequencies.

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Performance Evaluation of Geothermal Power Production Using EES (Case Study Ulumbu Geothermal Power Production Unit 4 East Nusa Tenggara, Indonesia) 9

Performance Evaluation of Geothermal Power Production Using ...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Ediatmaja, Prajamukti Darmanto, Prihadi Setyo Maulana, Dimas Taha Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Ulumbu geothermal working area (GWA) is in Ruteng district, East Nusa Tenggara province, Indonesia. Ulumbu GWA is owned by PLN. There are four geothermal power plants (GPP) in Ulumbu, which capacity 4 x 2.5 MW. It has operated since 2013. Steam used to generate electricity comes from ULB-2 production well. Wellhead temperature and pressure were 180-200°C and 11 bar. Ulumbu GPP Unit 4 uses a condensing type turbine. It has specific steam consumption (SSC) during commissioning around 9.8 T/MW. After 6 (six) years of operation, SSC becomes 10.04 T/MW on average. It gives a chance to perform optimization in the GPP's equipment. Before performing optimization, evaluation for every equipment based on as-built data is done by modeling using EES software. The method of evaluation is performed by thermodynamics analysis in each GPP's equipment. EES is chosen due to its simplicity to arrange many equations in a single window. EES could communicatively display calculation results through a parametric table, solution window, and diagram window. Operation data give information that turbine inlet pressure is operated under its specification. Turbine inlet pressure is operated under its specification because of the change of operating wellhead pressure. Non-Condensable Gas (NCG) content also decreases based on the last ULB-2 well fluid sampling. Using EES, parameter changes in turbine inlet pressure and NCG content are simulated to get optimum power generation value. The simulation results indicate that optimum turbine inlet pressure is obtained at 9.3 bar with SSC 9.17 T/MW. Ulumbu GPP Unit 4 that operated in that condition could reach cycle efficiency of about 10.39%. © Published under licence by IOP Publishing Ltd.

关键词： Thermodynamics

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Pyrolysis characteristics and dynamics analysis of a coal mine roadway conveyor belt

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Journal of Thermal Analysis and Calorimetry 2023年第11期148卷 4823-4832页

作者： Wang, Weifeng Liu, Hanfei Yang, Bo Zhang, Duo Lyu, Huifei Song, Xianming Shu, Chi-Min School of Safety Science and Engineering Xi’an University of Science and Technology Shaanxi Xi’an710054 China Postdoctoral Research Mobile Station in Mining Engineering Xi’an University of Science and Technology Shaanxi Xi’an710054 China Postdoctoral Program Xi’an University of Science and Technology 58 Yanta Mid. Rd. Shaanxi Xi’an710054 China Mine Rescue Team Yankuang Group Ltd. Co. Shandong Jining273500 China Graduate School of Engineering Science and Technology National Yunlin University of Science and Technology Yunlin Douliou64002 Taiwan

Coal mine conveyor-belt fires account for numerous mine disasters. Accurate prediction of burning degree is one of the critical factors in preventing and controlling conveyor-belt fires. The sparse qualitative smoke-detection method is challenging to meet the precise early warning of belt fire. Therefore, the Tangkou mine transportation belt was used to analyze TG-DTG curve change late, gas generation law, conversion rate, and apparent activation energy, and other factors at four heating rates via TG-FTIR experiments. The seven characteristic temperatures and their thresholds during belt combustion were experimentally determined, and the process was divided into three stages (I, II, III). The process mainly generated CH4, CO, CO2, and other gases, and the temperature range of various gases was identified. The conversion degree rate of each stage was positively correlated with the temperature. In Stages I and II, activation energy increased with the conversion rate and then decreased. Rate and temperature corresponding to the maximum activation energy were determined. Dynamic compensation effect of the belt combustion process was found. The reactions that could occur at each stage were inferred based on the above-mentioned characteristics;these findings were essential to intelligent comprehensive monitoring and early warning of conveyor-belt fire in a mine laneway. © 2022, Akadémiai Kiadó, Budapest, Hungary.

关键词： Coal

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Study of the Heat Loss Effect in Geothermal Steam Production Well 9

Study of the Heat Loss Effect in Geothermal Steam Production...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Wardana, Andrian Putra Saptadji, Nenny Miryani Maulana, Dimas Taha Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Well casing and cement temperature can change during geothermal production operation. The change of temperature occurs because of the heat transfer from the geothermal fluid to the formation. The heat transfer occurs because of the temperature difference in geothermal fluid and formation. The heat of fluid moves to the casing, cement, and formation through convection and conduction. This research aims to develop the heat transfer model in the steam production well, predict the steam heat loss and its effect on every 100 m well increment, and predict the well casing and cement temperature distribution and their effect on every well segment. The heat transfer model is an analytical calculation model developed to be the base of the calculation of heat loss and a temperature drop of well casing and cement. This model was developed for the calculation of heat loss in steam production well. The model was compared with a simulator to test the suitability. The fluid flow pressure drop and well lithology were considered in this model. The heat loss was very low during the steam production. The heat loss could be higher, along with the formation temperature drop. The material thermal conductivity and the well segment's layer thickness could affect the steam heat transfer in the production well. © Published under licence by IOP Publishing Ltd.

关键词： Cements

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