Article
Engineering, Chemical
Yueyi Pan, Ghislain Bournival, Seher Ata
Summary: The study shows that potassium amyl xanthate and sodium hydrosulphide can significantly increase bubble lifetime at the air-liquid interface, while helping to inhibit bubble coalescence. Additionally, xanthates and NaHS targeting the solid-liquid interface also affect the size and stability of bubbles.
MINERALS ENGINEERING
(2021)
Article
Mechanics
Mingyang Li, Qiming Huang, Yuting Yan, Kaipeng Chen
Summary: This study investigated the influence of calcium chloride (CaCl2) in coal seams on the rheological properties of foam fracturing fluid. The findings showed that CaCl2 has a significant impact on foam volume and stability. When the concentration of CaCl2 exceeds 0.25%, the viscosity of the base fluid decreases and stabilizes below 10 mPa s. Additionally, CaCl2 has a greater effect on bubble size in anionic surfactant foam fracturing fluids. Therefore, it is important to use foaming agents with good CaCl2 compatibility to minimize the influence of CaCl2 on fracturing performance.
Article
Engineering, Chemical
Ai Wang, Geoffrey Evans, Subhasish Mitra
Summary: In mineral flotation, understanding the dynamics of bubble surface loading (BSL) due to particle attachment and detachment is crucial for the separation kinetics of valuable minerals. This review provides an overview of current techniques for measuring BSL in both quiescent liquid and typical flotation environments. The acoustic emission method shows promise for online measurement in industrial systems, although its implementation has not been satisfactory yet. Challenges remain in estimating the BSL parameter and understanding its impact on the flow field around particle-laden bubbles and the drag coefficient. Coalescence behavior is delayed in the presence of surface loading, leading to the loss of surface energy. Future research should focus on addressing these challenges and finding solutions.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Shenglin Yan, Yan Zhang, Xiaoyong Yang, Yuan Huang, Zhishan Bai, Xiao Xu
Summary: Increasing NaCl concentration enhances the covering effect of oil droplets on bubbles, reduces covering time, and promotes more uniform spreading of oil droplets on the surface of bubbles.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Environmental
Sandra Orvalho, Petr Stanovsky, Marek C. Ruzicka
Summary: Experimental study on the coalescence of air bubbles in aqueous solutions of electrolytes reveals that the coalescence efficiency decreases with electrolyte concentration and bubble velocity, while the contact time decreases with bubble velocity but increases with electrolyte concentration. The transition from coalescence to noncoalescence proceeds via a minimum in the T(V) graphs, and bubble size affects the extent of the coalescence region.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Mechanics
Rui Zhang, Chang-Feng Zhou, Bo Chen, Liang-Jiu Jia
Summary: In this paper, in-situ micro-computed tomography (micro-CT) experiments were conducted on mild steel samples to study the void evolution under monotonic tension. The results showed that void growth mainly depends on the stress state, while void coalescence is influenced by both the stress state and intervoid spacing. Two stages of void coalescence, local coalescence and global coalescence, were observed during the void evolution process. The formation of macroscopic ductile cracks was caused by the propagation of fine cracks between voids along the strain localization band.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Ghislain Bournival, Xingshi Yang, Seher Ata
Summary: The study focused on the monolayer formation and behavior of spherical glass particles with varying degrees of hydrophobicity on an aqueous subphase containing different concentrations of frothers. It was found that the surface pressure isotherms of hydrophobic particles were more sensitive to PPG 425, leading to a significant increase in surface pressure with a small increment in its concentration. Additionally, the coalescence of bubbles released excess energy which was dissipated through the expansion and contraction of the newly formed interface, with the speed of waves decreasing in the presence of a particle monolayer.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Metallurgy & Metallurgical Engineering
Hangil Park, Chun Yong Ng, Liguang Wang
Summary: This study measured the size of air bubbles and critical coalescence concentration in froth flotation, and found that oscillatory air supply can effectively reduce bubble size and decrease the critical concentration of various frothers.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Polyxeni K. Tsave, Margaritis Kostoglou, Thodoris D. Karapantsios, Nikolaos K. Lazaridis
Summary: Flotation is a crucial separation technique in the mining industry, especially for fine and ultra-fine particles. Combining conventional air bubbles with micro-bubbles from water electrolysis has been found to enhance flotation efficiency, particularly for recovering ultrafine particles. The experimental results on a hybrid flotation device show a 10% increase in fine particle recovery with the addition of micro-bubbles.
Article
Engineering, Chemical
Arsalan Behzadipour, Amir H. Azimi, Iran E. Lima Neto
Summary: Vertically discharged bubble plumes have various applications and their characteristics are affected by air discharge. A series of laboratory experiments were conducted to study the effects of air discharge on bubble dynamics. The results showed that bubble characteristics varied with distance from the nozzle and all parameters gradually decreased afterwards. The increase in air discharge resulted in an increase in bubble diameter, bubble frequency, and turbulent intensity. (c) 2022 Elsevier Ltd. All rights reserved.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Arsalan Behzadipour, Amir H. Azimi, Iran E. Lima Neto
Summary: A series of laboratory experiments were conducted to improve the entrainment and mixing capacity of vertically discharged bubble plumes by using a grid-screen. The size and distance of the grid-screen were found to affect the velocity, concentration, and size of the bubbles.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Satirtha K. Sarma, Aditya Singh, Ratan Mohan, Anupam Shukla
Summary: Efficient management of evolving oxygen gas bubbles at the photoanode is crucial for optimal performance of a photoelectrochemical (PEC) cell. Computational fluid dynamics (CFD) simulations and experimental results indicate that reduced bubble residence time and enhanced electrolyte access to the photoanode surface promote faster and more efficient oxygen evolution reaction (OER) kinetics. The morphology of the electrode, specifically using hydrophilic hematite nanorod arrays instead of planar photoanodes, further improves PEC performance by reducing bubble adhesion and increasing charge transfer efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Engineering, Environmental
Inna Levitsky, Dorith Tavor, Vitaly Gitis
Summary: Air-water micronanobubbles (MNBs) have the potential to improve various processes in water and wastewater treatment, including oxygen transfer, algae flotation, organic compound decomposition, and fouling mitigation. Integration of MNBs with macrobubbles and air slugs can minimize the role of water treatment chemicals and enhance treatment efficiency. Future research should focus on sustainable water resource utilization and reduction of chemical usage.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Chemical
Yueyi Pan, Isaac Gresham, Ghislain Bournival, Stuart Prescott, Seher Ata
Summary: This study investigates the effects of flotation reagents and salt on the air-liquid interface and stability of air bubbles. The results show that NaCl enhances the adsorption of frothers and there is a synergistic effect between PAX and two frothers, improving bubble stability.
Article
Mechanics
Majid Rodgar, Helene Scolan, Jean-Louis Marie, Delphine Doppler, Jean-Philippe Matas
Summary: The study experimentally examined the behavior of a bubble injected into a horizontal liquid solid-body rotating flow, showing how factors such as bubble size, rotation speed, and buoyancy impact the bubble's aspect ratio and movement. The study also found that at certain extreme conditions, such as when the Reynolds number exceeds 3000, the bubble can experience abrupt transitions and potentially break up due to resonance between the periodic forcing of the rotating cell and the eigenmodes of the stretched bubble.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Biotechnology & Applied Microbiology
Henri Muller, Lars Barthel, Stefan Schmideder, Tabea Schuetze, Vera Meyer, Heiko Briesen
Summary: This study presents a high-throughput image analysis pipeline based on stereomicroscopy to comprehensively assess the developmental program of filamentous fungi in submerged conditions. By tracking spore agglomeration and pellet formation, culture heterogeneities and pellet breakage can be quantified.
BIOTECHNOLOGY AND BIOENGINEERING
(2022)
Article
Engineering, Chemical
Tiaan Friedrich, Michael Kuhn, Daniel Schiochet Nasato, Heiko Briesen
Summary: This study investigates the impact of material properties on the behavior of compressible filter cakes through simulation experiments. A compression-permeability (CP) cell is used, and a bidisperse particle packing is simulated using the discrete element method. The results show that Young's modulus, the coefficient of sliding friction, and the surface energy density have the strongest impact on cake solidity and compressibility.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Engineering, Chemical
B. M. Woerthmann, H. Briesen
Summary: Coating of particulate solids is a common process in various industries, and the wetting behavior has a significant impact on the coating quality, especially for hot-melt coating. Previous studies have shown that delamination of the coating layer frequently occurs in hot-melt coating products. This study investigated the delamination frequency and wetting behavior through experiments and measurements. The results revealed no correlation between delamination and wetting behavior, and different coating materials exhibited varying degrees of delamination.
Review
Chemistry, Applied
Cornelia Eder, Heiko Briesen
Summary: This article reviews the evolution and applications of interferometry, categorizes the main areas of application and assessable properties and phenomena, and discusses some fundamental open questions.
ANNUAL REVIEW OF CHEMICAL AND BIOMOLECULAR ENGINEERING
(2022)
Article
Engineering, Chemical
Simon A. Schiele, Rolf Meinhardt, Tiaan Friedrich, Heiko Briesen
Summary: This article investigates the interaction between crystal growth and abrasion on crystal shape and discusses the potential misinterpretation of experimental data due to neglecting crystal shape.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Computer Science, Interdisciplinary Applications
Philip Pergam, Heiko Briesen
Summary: This study aims to improve the computational efficiency of a complex mathematical cake-filtration model with strong nonlinearities. A hybrid data-driven approach using proper orthogonal decomposition is employed, and optimal, globally defined basis functions are found based on a few sample simulations. The reduced-order model obtained from this approach has a 98% decrease in dimension compared to the full-order model, resulting in a 90% decrease in computational time for solving a benchmark optimization problem. This significant numerical speed-up offers the potential to use the reduced-order model in advanced process control and optimization methods.
COMPUTERS & CHEMICAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Verena Bernadette Pannusch, Lukas Viebahn, Heiko Briesen, Mirjana Minceva
Summary: Supercritical fluid extraction from hops extracts essential oil that can be used for the flavoring of beer. This study analyzes and models the extraction kinetics of seven oil components under different pressure and temperature conditions. The results show that the internal-mass-transfer-control (IMTC) model effectively describes the extraction kinetics and can be used for predicting extract composition at different pressures and temperatures.
Article
Engineering, Chemical
Simon Alexander Schiele, Ramona Bier, Albin Ommert, Heiko Briesen
Summary: Due to the complex nature of crystallization processes, it is difficult to control them effectively. However, this study proposes a new method called direct crystal growth control (DGC), which avoids the need for thermodynamic parameterization. Instead, a single crystal is used as an analogue twin to measure the growth rate and serve as a proxy for the suspended crystals. By manipulating the temperature, the growth rate of the analogue twin can be kept constant, resulting in a constant growth rate for the suspended crystals. Further exploration of the hydrodynamic conditions is needed for accurate application of DGC.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Yvonne Kohl, Michelle Mueller, Marielle Fink, Marc Mamier, Siegfried Fuertauer, Roland Drexel, Christine Herrmann, Stephan Daehnhardt-Pfeiffer, Ramona Hornberger, Marius I. Arz, Christoph Metzger, Sylvia Wagner, Sven Saengerlaub, Heiko Briesen, Florian Meier, Tobias Krebs
Summary: In this study, a 96-well exposure system for nanomaterial safety assessment is developed and characterized using a lung epithelial model in an air-liquid interface. Sequential nebulization is applied to ensure reproducible distribution. Sequential exposure studies with different substances are conducted, followed by quantification of mass deposition and cell viability. This exposure system offers the possibility of high-throughput rates and sequential dosing, generating more reliable cell-based assay data for safety analysis of chemicals, drugs, and nanomaterials.
Article
Crystallography
Cornelia Eder, Simon A. Schiele, Frederik Luxenburger, Heiko Briesen
Summary: The integration of a flow-through cell into a Mach-Zehnder interferometer allows for detailed study of crystal dissolution, measuring the displacement velocity of a specific crystal facet and the solute concentration distribution in real time. The setup was successfully used to observe disintegration and mass transfer separately, improving predictions of active pharmaceutical ingredient bioavailability.
Article
Biotechnology & Applied Microbiology
Marcello Nussbaumer, Daniel van Opdenbosch, Max Engelhardt, Heiko Briesen, Tanja Karl
Summary: Mycelium composites have gained attention as potential substitutes for fossil-based plastics, particularly EPS. However, there is limited research on the combinations of fungi and lignocellulosic waste. This study explores the properties of mycelium composites produced with two white rot fungi and beech wood sawdust, highlighting the importance of fungal species selection and post-processing options.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Biotechnology & Applied Microbiology
Henri Mueller, Charlotte Deffur, Stefan Schmideder, Lars Barthel, Tiaan Friedrich, Lukas Mirlach, Joerg U. Hammel, Vera Meyer, Heiko Briesen
Summary: Filamentous fungi are capable of producing a wide range of biotechnological compounds. By utilizing synchrotron radiation-based X-ray microtomography, we were able to obtain highly resolved 3D micro-morphological analysis of submerged cultivated fungal pellets. This analysis provided detailed information about the number and density of spores, tips, branching points, and hyphae, thereby allowing us to monitor the growth of these fungal pellets in great detail for the first time.
BIOTECHNOLOGY AND BIOENGINEERING
(2023)
Article
Engineering, Chemical
B. M. Woerthmann, A. Hoffmann, J. Gerber, T. Wittkamp, H. Briesen
Summary: The hot-melt coating process is widely used in the food and pharmaceutical industries to change the functional properties of particle surfaces, form a protective layer, or influence the release rate of encapsulated substances. This study focuses on evaluating the interparticle batch homogeneity and comparing it with alternative methods for coating quality analysis. The results show that a process temperature of 40 degrees C has the most favorable effect on interparticle batch homogeneity, while spray rates between 3 and 20 g/min have minimal influence.
Article
Food Science & Technology
Benedikt K. L. Schmieder, Verena B. Pannusch, Lara Vannieuwenhuyse, Heiko Briesen, Mirjana Minceva
Summary: This study systematically investigated the influence of coffee grinding, water flow rate, and temperature on the extraction kinetics of espresso coffee components. The analysis revealed that flow rate had the strongest effect on the component mass in the cup, especially at finer grindings and higher water temperatures. Overall, the observed influences were minor compared to changes resulting from differences in total extracted espresso coffee mass.
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.