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Mass Transfer Performance of Ethanol Removal by CO2 Stripping in Different Pneumatic Bioreactors

Industrial Biotechnology 2020年第2期16卷 81-90页

作者： Martins, Taise B. Almeida, Letícia P. Cerri, Marcel O. Badino, Alberto C. Graduate Program of Chemical Engineering Federal University of São Carlos C.P. 676 São Carlos SP13565-905 Brazil Department of Bioprocesses and Biotechnology Faculty of Pharmaceutical Sciences University of São Paulo State Araraquara SP Brazil

The hydrodynamics and mass transfer characteristics of ethanol stripping with CO2 were evaluated for a 2.0-L pneumatic bioreactor operated in bubble column (BC), concentric-tube airlift (CTA), and split-cylinder airlift (SCA) configurations, as well as for bubble columns with three different working volumes (2.0, 5.0, and 10.0 L). The results showed that an increase of the global gas hold-up (G) did not enhance ethanol removal in any of these prototypes. The volumetric ethanol removal coefficient (kLEa) values were very similar for the three models, despite the higher G obtained for the CTA configuration. The same behavior was observed for the three scales of BC prototypes, except for distinct behavior observed at the 10.0-L scale operated above 2.5 vvm. In order to predict kLEa for different scales and operational conditions, a dimensionless correlation was proposed for the Sherwood number, which provided an excellent fit to the experimental data, with few points exceeding ±10% deviation. The ethanol concentration factor (FC) values increased with decrease of the specific gas flow rates, with the highest FC value of around 6.0 (6 times the original solution concentration) obtained for the 10.0-L scale of BC. Therefore, increasing the prototype size led to an increase of Fc, resulting in greater ethanol enrichment of the gas stream leaving the equipment. © 2020, Mary Ann Liebert, Inc., publishers 2020.

关键词： Mass transfer

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Production of bio-dimethyl ether from oil palm residue via integrated gasification and direct DME synthesis process

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AIP Conference Proceedings 2023年第1期2827卷

作者： Karittha Im-Orb Amornchai Arpornwichanop Program in Food Process Engineering School of Food-Industry King Mongkut’s Institute of Technology Ladkrabang Bangkok 10520 Thailand Center of Excellence in Process and Energy Systems Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand Bio-Circular-Green-economy Technology & Engineering Center Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand

The production of bio-dimethyl ether via an integration of biomass gasification and direct DME synthesis (IBG-DME) was studied. The oil palm residue was a considered feedstock. The parametric analysis was done to examine the impact of gasifying temperature on the product composition, energy demand of each unit and overall process using the developed Aspen plus model. The high gasifying temperature offered high production rate of valuable products (bio-DME and bio-methanol), and low CO2 emission. The IBG-DME process could operate at thermal self-sufficient condition when gasifying temperature was maintained at 882 °C. The maximum yield of bio-DME of 0.3472 kg.h−1 could be achieved at gasifying temperature of 950 °C. At this condition, the CO2 emission, overall energy consumption and energy efficiency were 0.7457 kg.h−1, 0.00776 kW and 59.76 %, respectively.

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Design prototype of audio guidance system for blind by using raspberry pi and fuzzy logic controller 2

Design prototype of audio guidance system for blind by using...

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2nd International Conference on Mechanical, Electronics, Computer, and Industrial Technology, MECnIT 2018

作者： Ma'muriyah, Ni'matul Yulianto, Andik Lili Electrical Engineering Study Program Faculty of Industrial Technology Universitas Internasional Batam Indonesia

With almost 3.75 million people with visually impaired in Indonesia, according to statistical data shown that most of them not live in prosperity. To increase their productivity they need an assistive device that's allows them to navigate freely. This paper presents a novel Audio guidance system for blind in the shape of simple bag with earphone for giving them an audio guidance efficiently and safety. Different with other audio guidance, we propose a simple system consist of Raspberry Pi Camera and Ultrasonic Sensor as input, Raspberry Pi, Earphone and Power bank. This system is initiated by providing a voice command of the direction where the blind person must walk or go through, so they can avoid from obstacles. We also apply Fuzzy Logic Controller (FLC) to detect the obstacles along they walk by using 3 ultrasonic sensors. The experimental result shows that by using FLC and interfacing by Raspberry Pi the proposed system can effectively to detect the obstacles and give direction with 2.32% distance error. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Fuzzy logic

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Enhancing community engagement with digital twins: Technological adoption in marine debris management

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Journal of Urban Management 2025年

作者： Suhardono, Sapta Fitria, Laili Prayogo, Wisnu Lee, Chun-Hung Suryawan, I Wayan Koko Environmental Sciences Study Program Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Surakarta 57126 Indonesia Department of Environmental Engineering Universitas Tanjungpura Pontianak 78124 Indonesia Department of Building Engineering Education Universitas Negeri Medan Medan Indonesia Department of Natural Resources and Environmental Studies College of Environmental Studies and Oceanography National Dong Hwa University Hualien 97401 Taiwan Department of Environmental Engineering Faculty of Infrastructure Planning Universitas Pertamina Jalan Sinabung II Terusan Simprug Jakarta 12220 Indonesia Center for Environmental Solution (CVISION) Universitas Pertamina Jalan Sinabung II Terusan Simprug Jakarta 12220 Indonesia Center for Interdisciplinary Research on Ecology and Sustainability College of Environmental Studies and Oceanography National Dong Hwa University Hualien 97401 Taiwan

This research investigates the adoption of digital twin technology for marine debris management in Bali, focusing on the regions of Denpasar, Badung, Gianyar, and Tabanan. Digital twin technology involves creating virtual models that replicate physical environments and processes, enabling real-time monitoring and simulation. This capability is particularly crucial in Bali, where marine debris presents significant ecological and economic challenges. Digital twin technology offers a strategic advantage by allowing detailed scenario analysis and optimization of management strategies. Using Structural Equation Modeling (SEM), the study evaluates the influence of four key factors within a community resilience framework on the willingness to adopt digital twins: risk perception, planning capability, coping ability, and interest level. The findings suggest that heightened awareness through targeted workshops and campaigns significantly boosts the community's willingness to engage with digital twin technology, highlighting the impact of risk perception. In terms of planning capability, strong processes such as the creation of action plans and task forces are crucial for integrating digital twins into marine debris management strategies. Additionally, robust coping mechanisms, which benefit from access to advanced technologies for real-time response, correlate with a greater readiness to adopt digital twins. Lastly, active community involvement in environmental initiatives indicates a higher propensity to support innovative technological solutions, underscoring the importance of interest level. The study emphasizes the critical role of these factors in creating an environment conducive to the adoption of digital twin technology in Bali. By enhancing these aspects of the community resilience framework, the region can more effectively leverage digital twins to address its marine debris problem. This research offers valuable insights for policymakers, practitioners, and researc

关键词： Community engagement Digital twin technology Marine debris management Structural equation modeling

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The analysis of groundwater quality around a material (solid waste) recovery facility (a case study of the Merdeka 2 material recovery facility in Depok, West Java)

The analysis of groundwater quality around a material (solid...

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International Conference on Science and Innovated engineering 2018, i-COSINE 2018

作者： Adriansyah, H.S. Hartono, D.M. Suwartha, N. Gusniani, I. Environmental Engineering Study Program Department of Civil Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok Depok16424 Indonesia

Merdeka 2 Material Recovery Facility (MRF) is an organic waste management facility located in West Java. MRF also produces leachate water which came from organic waste that could potentially pollute shallow groundwater around the facility. Purpose of this study is to obtain knowledge regarding amount of MRF's waste intake and composition, composition of leachate water that came from the waste, and the groundwater quality around MRF with parameters including pH, temperature, BOD, COD, Nitrite, Nitrate, Ammonia, KMnO4, Iron (Fe), and Fecal Coliform. Quality of the groundwater was analysed by knowing pollution rate based on pollution index and its association with distance variation from MRF. Results showed that amount waste that came to the facility is 0.954 ton/day with an average of waste volume 1449.20 l/day and consists of 93.4% organic waste and 6.4% non-organic waste. For MRF's leachate water quality showed that pH, temperature, BOD and COD parameters exceeded over required standard. Shallow groundwater around MRF showed that average rate of pH, BOD, COD, Nitrate parameters is still above required standard and other parameters average is still in required standard and there is no significant correlation between distance variation with the groundwater. It can be concluded that the pollution index of the local's shallow groundwater fall into low to mid polluted category. © Published under licence by IOP Publishing Ltd.

关键词： Groundwater

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Enhanced properties of PBAT by incorporating CNC

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AIP Conference Proceedings 2023年第1期2607卷

作者： Emre Vatansever Dogan Arslan Deniz Sema Sarul Ali Durmus Mohammadreza Nofar Polymer Science and Technology Program Istanbul Technical University Maslak Istanbul 34469 Turkey Metallurgical & Materials Engineering Department Faculty of Chemical and Metallurgical Engineering Istanbul Technical University Maslak Istanbul 34469 Turkey Department of Chemical Engineering Faculty of Engineering Istanbul University-Cerrahpasa Avcılar Istanbul 34320 Turkey

In this study, cellulose nanocrystal (CNC) dispersion within polybutylene adipate terephthalate (PBAT) was investigated. PBAT/CNC nanocomposites with various CNC contents were prepared through solution casting as well as dilution of a solution casted masterbatch using a twin screw extruder. The efficiency of two different preparation approaches on CNC dispersion was assessed by transmission electron microscopic and rheological analysis. It was found that solution casted PBAT/CNC nanocomposites had a much better CNC dispersion compared to that of their melt processed counterparts. This was while the diluted melt processed cases also revealed a good level of CNC dispersion. As a result, CNC was able to form a percolation network within PBAT at CNC contents of around 2 and 4 wt% in the two approaches, respectively.

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Design of a Novel Andean Food Matrix: "Cañihua-Rice" by Warm Extrusion Process, Based on Cañihua (Chenopodium Pallidicaule Aellen) and Rice (Oryza Sativa) Flours

SSRN

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SSRN 2023年

作者： Quispe, A. Javier Moreno, María Carolina Leon, Alicia M. Bouchon, Pedro Medina, Wenceslao Teddy Health Sciences Program Postgraduate School Univ. Nacional del Altiplano de Puno P.O. Box 291 Puno Peru Dept. of Chemical and Bioprocesses Engineering School of Engineering Pontificia Univ. Católica de Chile P.O. Box 306 Santiago Chile School of Agroindustries Faculty of Agrarian Sciences Univ. Nacional del Altiplano de Puno P.O. Box 291 Puno Peru

Many countries have native crops with excellent protein quality that are not widely consumed because they have been displaced by introduced crops such as rice. This work proposes the design of food matrices combining the structural and physical qualities of rice with high cañihua protein quality, a South America highlands ancestral crop. Different extruded cañihua-rice mixtures were physically and microstructurally characterized and compared with those of brown and extruded-rice. Cañihua-rice kernels were treated by warm-extrusion process to give formulations of 10%-90% and 20%-80% of cañihua flour and rice flour, respectively. Physicochemical analyses showed that protein contents resulting from addition of cañihua-rice kernels were 8.8% and 10%, respectively, compared to 7% of rice flour. Hardness of cooked cañihua-rice kernels was similar to extruded-rice and slightly lower than cooked brown rice, while color of these kernels was between those of extruded and brown rice. Microstructural analyses (FESEM and micro-CT) showed that extruded cañihua-rice mixtures had heterogeneous particles of cañihua flour embedded in rice flour structure. Sensorial analysis showed that cooked cañihua-rice from Cupi10 were similar to brown rice cooked. Finally, extruded cañihua-rice mixtures constituted a novel food matrix that could be used to increase the nutritional levels for consumers of rice. © 2023, The Authors. All rights reserved.

关键词： Crops

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Microwave assisted aqueous ammonia pretreatment of oil palm empty fruit bunch: Effect on lignin removal and morphological structure 2

Microwave assisted aqueous ammonia pretreatment of oil palm ...

引用

2nd International Conference on Clean Energy and Electrical Systems, CEES 2019

作者： Perdana Harahap, Andre Fahriz Aditya Rahman, Azhar Gozan, Misri Bioprocess Engineering Program Chemical Engineering Department Faculty of Engineering Universitas Indonesia Kampus UI Depok 16424 Indonesia

Oil palm empty fruit bunch (OPEFB) is an abundant solid waste produced by oil palm industries to which the cellulose, hemicellulose, and lignin content has potential for conversion into high value biochemical products. However, pretreatment must be applied to remove lignin thus making cellulose and hemicellulose available for further conversion. In this study, effect of three parameters of microwave assisted aqueous ammonia pretreatment such as microwave power (280;560;840 Watt), NH3 concentration (7.5;10;12.5 % w/v), and reaction time (3;6;9 minutes) on lignin removal (%) were evaluated by using response surface methodology with Box-Behnken design. OPEFB at different size ranging from 30 - 40 mesh was used as the raw material. Moreover, to evaluate the morphological structure, scanning electron microscope (SEM) analysis was employed both on untreated and pretreated OPEFB. The quadratic model showed that microwave power of 837.8 Watt, NH3 concentration of 12.2% (w/v), and reaction time of 8.9 minutes resulted the highest lignin removal of 81.60%. SEM images showed that pretreated OPEFB encountered a heavy structural destruction. These results show that microwave assisted aqueous ammonia pretreatment can be a promising method to be applied to disrupt the compact lignocellulose structure of OPEFB and to remove its lignin content efficiently under very short period of time. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Fruits

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Floor Slab Analysis (Case study: One Residence Apartment Batam Center) 2

Floor Slab Analysis (Case Study: One Residence Apartment Bat...

引用

2nd International Conference on Mechanical, Electronics, Computer, and Industrial Technology, MECnIT 2018

作者： Astutik, Yayuk Setyaning Civil Engineering Study Program Planning and Civil Engineering Faculty Universitas Internasional Batam Riau Island29442 Indonesia

Reinforced concrete slab are widely used in civil buildings, including as building floors, roof floors, bridge floors and dock floors. The load acting on the slab is generally calculated against gravitational loads. This study aims to analyse floor slab in One Residence Batam Center Apartment Construction Project. The moment method is used to predict the magnitude of frame and shrinkage values that refer to 2002 of SNI. Loading is carried out from dead loads and live loads with a two-way reinforcement system. Reinforcement is done using steel with a diameter of 10 mm. So that the minimum area is 313 mm square with a distance of 250 mm and is in the safe category. From the calculation results obtained the concrete elastic modulus obtained by 250 MPa with a reinforcement ratio of 0.0025. Checking the time dependency factor for dead loads is carried out within 3 months, 6 months, 12 months and more than 5 years. Long-term deflection due to frame and shrinkage is still in the safe category. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Floors

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Calibration of 100 A/50mA instrument current transformer energy meter using bisection method 2

Calibration of 100 A/50mA instrument current transformer ene...

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2nd IEEE International Conference on Innovative Research and Development, ICIRD 2019

作者： Bimantoro, Renardi Ardiya Rahardjo, Amien Husnayain, Faiz Aryani, Dwi Riana Hudayala, Chairul Universitas Indonesia Department of Electrical Engineering Faculty of Engineering Depok16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia

ISBN: (纸本)9781728128252

Instrument current transformers (CTs) are widely used in various types of electrical energy measurement. Eddy current losses, losses of hysteresis, a saturation of CT, and inevitable flux leaks could lead to errors including errors in the ratio and phase angle. Improving the accuracy of CT measurement could be achieved in many ways. In this study, a bisection calibration method to overcome the error by implementing correction factor integrated with the Arduino codes is investigated. The reliability of this system has been tested in two different situations, which are a constant and variable load experiments. The result shows that the readout of the developed instrument using 100 A/50mA CT could achieve the deviation value of less than 2%, confirming the excellence accuracy of energy meter. © 2019 IEEE.

关键词： Electric instrument transformers

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