Article
Engineering, Chemical
Maksym Loginov, Floriane Doudies, Nicolas Hengl, Mohamed Karrouch, Nadine Leconte, Fabienne Garnier-Lambrouin, Javier Perez, Frederic Pignon, Genevieve Gesan-Guiziou
Summary: The study presents a method for direct characterization of the reversibility of deposit compression on membrane surfaces, analyzing the local solid concentration distribution during deposit formation and removal at constant pressure and cross-flow velocity. It was found that casein micelle deposits obtained under certain conditions swell after pressure relaxation, but the swelling rate is lower than predicted, indicating partial irreversibility of compression.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Junwei Zhang, Shiyang Huang, Hao Guo, Anthony G. Fane, Chuyang Y. Tang
Summary: The configurations of crossflow filtration cells play an important role in determining membrane separation performance. This study investigated the effects of cell designs, including sealing approaches and back support configurations, on water flux, salts rejection, and fouling behavior. It was found that the definition of effective filtration area in the O-ring sealed cell could lead to an overestimation or underestimation of membrane water flux compared to the benchmark data. Additionally, using a highly porous back support resulted in higher water flux, salts rejection, and better antifouling performance compared to a perforated plate support.
Article
Engineering, Chemical
Floriane Doudies, Maksym Loginov, Nicolas Hengl, Mohamed Karrouch, Nadine Leconte, Fabienne Garnier-Lambrouin, Javier Perez, Frederic Pignon, Genevieve Gesan-Guiziou
Summary: Filtration of milk protein at different temperatures revealed that higher temperature resulted in thicker and more concentrated deposits that were more susceptible to erosion. Additionally, the deposit swelling rate was significantly higher at 42 degrees Celsius compared to 12 degrees Celsius, indicating a greater impact of temperature on membrane fouling.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Elia Arnese-Feffin, Pierantonio Facco, Daniele Turati, Fabrizio Bezzo, Massimiliano Barolo
Summary: In this study, a hybrid modeling strategy is proposed to characterize reversible and irreversible fouling in multi-module biorefinery membrane separation systems. The combination of a data-driven model and a knowledge-driven model allows monitoring of membrane fouling and valuable insight to be obtained through simple visual inspection.
CHEMICAL ENGINEERING SCIENCE
(2024)
Review
Biochemistry & Molecular Biology
Mashitah Che Razali, Norhaliza Abdul Wahab, Noorhazirah Sunar, Nur Hazahsha Shamsudin
Summary: Water is essential for life, especially in terms of drinking water. This research paper provides a comprehensive review of membrane filtration technology for treating drinking water. It focuses on membrane fouling, identifies parameters that influence fouling, and discusses various methods to handle fouling, including prevention, prediction, and control automation. The study shows that prevention is the most common treatment for fouling, although it involves the use of chemicals that may affect human health. Prediction is often used to anticipate fouling development. There is limited research on membrane fouling control based on automation, and treatment methods and control strategies are usually determined individually.
Article
Engineering, Chemical
Berinike Braesel, Sang-Whon Yoo, Sabrina Huber, Matthias Wessling, John Linkhorst
Summary: Understanding the impact of operating conditions on fouling in crossflow membrane filtration is a challenge. This study uses a CFD-DEM approach to simulate particle motion and deposition behavior in a membrane-mimicking geometry. The results show that crossflow velocity affects dynamic fouling behavior, while trans-membrane pressure influences particle removal and flux decline. The study connects visual pore-scale phenomena to macroscopic filtration quantities, bridging the gap between pore-scale events and the filtration process.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Food Science & Technology
S. Abdullah, Sankha Karmakar, Rama Chandra Pradhan, Sabyasachi Mishra
Summary: This study optimized process parameters for centrifugation and microfiltration using artificial neural network-genetic algorithm technique. The clarified juice at the optimum conditions successfully removed tannin, turbidity, and retained ascorbic acid content, achieving a high steady-state permeate flux.
JOURNAL OF FOOD PROCESSING AND PRESERVATION
(2022)
Article
Engineering, Environmental
Amira Abdelrasoul, Huu Doan, Ali Lohi, Ning Zhu
Summary: This study aimed to investigate the influences of air injection concurrently and counter currently on membrane fouling and permeate flux for homogeneous Polycarbonate and heterogeneous Polysulfone membranes in the cross-flow ultrafiltration process. The results showed that counter current air flow led to the elimination of fouling at the top layers but increased fouling between intermediate and lower layers inside the membrane matrices, compared to concurrent air injection. Additionally, the study demonstrated that counter current air injection resulted in more particle deposition and turbulences, leading to a reduction of permeate flux.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Shweta Rawat, Abhijit Maiti
Summary: Adsorption is the most effective method for arsenic removal, but it cannot be applied in large-scale treatment in centralized water supply systems. In this study, a low-cost laterite-derived adsorbent (LDA) was combined with cross-flow ultrafiltration (Ads-UF) to develop a strategy for remediation of arsenic-contaminated water. The effect of adsorbent particles on permeate flux was assessed, and two different hybrid configurations were considered. The results showed that flux decline was higher with Ads-UF compared to Ads-SF-UF, and the spent LDA was found to be safe for disposal.
Article
Engineering, Chemical
M. Elizabeth Butler, Jonathan Brant
Summary: Produced water (PW) is a complex mixture generated during oil and gas extraction. Membrane fouling by hydrocarbon emulsions challenges most PW treatment systems. Electrospinning nanofibrous polyacrylonitrile (PAN) membranes with polyaniline (PANI) and reduced graphene oxide (RGO) nanoparticles showed great potential in improving the performance of PW treatment and resisting fouling.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Environmental Sciences
Muhammad Ibrahim, Muhammad Haq Nawaz, Prangya Ranjan Rout, Jun-Wei Lim, Bandita Mainali, Muhammad Kashif Shahid
Summary: This comprehensive review focuses on treatment technologies for produced water, with particular emphasis on membrane-based systems. These systems offer advantages such as high contaminant removal efficiencies and compact design. The review highlights the challenges faced by these technologies, such as operational efficiency and fouling, and emphasizes the need for further research and optimization of processes to enhance their efficiency. It also explores the integration of conventional methods with advanced treatment processes to develop hybrid systems for improved treatment efficiency.
Article
Polymer Science
Parvane Saeid, Mohammad Zeinolabedini, Mehrdad Khamforoush
Summary: Our study aimed to simulate the separation of oil/water emulsions using a crossflow ultrafiltration polysulfone/polyvinylpyrrolidone (PSF-PVP) membrane. We produced the membrane using the phase inversion method with a polysulfone (PSF) polymer base, a polyvinylpyrrolidone (PVP) additive, and a dimethylformamide (DMF) solvent. The experiments analyzed the changes in permeate flux and rejection over approximately 480 minutes. The data supported the predictions of the model.
IRANIAN POLYMER JOURNAL
(2023)
Article
Chemistry, Physical
Ettore Virga, Robert W. Field, P. M. Biesheuvel, Wiebe M. de Vos
Summary: In this study, a quantitative model is proposed to describe cake layer formation and pore blocking in membrane fouling. The model is validated using experimental data and it is found that cake layer formation can start and occur while the degree of pore blocking is still increasing.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Chemical
Hasan Idrees, Aws Al-Ethawi, Ibrahim M. A. ElSherbiny, Stefan Panglisch
Summary: This study investigated the applicability of surfactant-enhanced multiple-cycle dead-end ultrafiltration operation for the polishing treatment of produced water. The experiments were conducted using lab-scale modules and mini-plant testing unit. The results showed that the hydraulic backwashing efficiency was substantially enhanced, leading to a consistent dead-end ultrafiltration performance treating emulsified oils with oil contents up to 50 mg/L.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
M. Courbalay, M. Villain-Gambier, A. Klem, I Ziegler-Devin, S. Dumarcay, D. Trebouet
Summary: This study aimed to investigate the recovery of lignin in thermo-mechanical process water through membrane processes, by adjusting the pH to enhance membrane selectivity towards lignin. It was found that using a 1 kDa nanofiltration membrane at pH 4 could achieve good separation of lignin and hemicelluloses.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Loveday C. Igbokwe, Greg F. Naterer, Sohrab Zendehboudi, Simon Pedersen, Stefan Jespersen
Summary: This study evaluates two slug control approaches in the transport and separation of multiphase flows in pipelines, showing that active topside choking can effectively suppress slugs and stabilize system flowrates and pressures, while gas-lift method reduces system instability and increases production.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Leif Hansen, Mads Valentin Bram, Simon Pedersen, Zhenyu Yang
Summary: Offshore produced water treatment is the process of cleaning waste water in the offshore oil and gas industry. This study evaluates the separation performance of different control solutions and suggests using operational policy-based control.
Article
Automation & Control Systems
Shaobao Li, Feng Wang, Meng Joo Er, Zhenyu Yang
Summary: This article proposes a distributed control scheme for the approximate output regulation of discrete-time stochastic MASs subject to heterogeneous and unknown dynamics. A distributed observer is designed for the exosystem-state estimation of agents, and nonlinear regulator equations are constructed for the feedforward control design to achieve distributed exosystem compensation. The proposed control law utilizes a high-order neural network and adaptive control law to approximately solve the nonlinear regulator equations with unknown nonlinearity, achieving the approximate output regulation of discrete-time stochastic MASs.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2022)
Article
Automation & Control Systems
Shaobao Li, Petar Durdevic, Zhenyu Yang
Summary: This article investigates the optimal control policy learning for underactuated vertical take-off and landing (VTOL) aerial vehicles with unknown mass and inertia matrix, proposing a novel off-policy integral reinforcement learning (IRL) scheme for parameter identification and trajectory tracking.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Engineering, Marine
Fredrik Fogh Sorensen, Malte von Benzon, Jesper Liniger, Simon Pedersen
Summary: This study investigates the impact of sensor delays on control performance and proposes an input-output controllability analysis method for open-loop systems. The findings suggest that near-structure operations have a lower threshold for time delays, while off-structure navigation allows for larger time delays.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Nianci Lu, Lei Pan, Ahmad Arabkoohsar, Zhenxiang Liu, Jiaxing Wang, Simon Pedersen
Summary: This article proposes connecting district heating networks to combined cycle gas turbine (CCGT) plants as a thermal energy storage capacity, improving the flexibility of CCGTs. It focuses on developing an appropriate control strategy to effectively control the power-heat conversion and meet the heat and power demands of the connected network. By using load signal decomposition and synergistic load response, the proposed control strategy can reduce the gap between grid demand and CCGT power and ensure grid stability.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Marine
Malte von Benzon, Fredrik Fogh Sorensen, Esben Uth, Jerome Jouffroy, Jesper Liniger, Simon Pedersen
Summary: This paper presents a simulation model environment for the popular and low-cost remotely operated vehicle (ROV) BlueROV2, which has been experimentally validated for benchmark control algorithms for underwater vehicles. The model includes kinematic, hydrodynamic and dynamic models, as well as gravitational and buoyant forces. It provides a benchmark for future control schemes for position control and trajectory tracking under environmental disturbances.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Analytical
Fredrik Fogh Sorensen, Christian Mai, Ole Marius Olsen, Jesper Liniger, Simon Pedersen
Summary: Acoustic and optical sensing are the two primary methods used for underwater environments. Acoustic sensing is preferred due to its high transmissivity and immunity to environmental factors, while optical sensing is valuable for operational and inspection tasks. This study compares the performance of two commercial sensors and an augmented optical method in controlled underwater environments, showing that optical stereo depth estimation and laser triangulation perform well up to one meter, while acoustic measurements are unaffected up to two meters under high turbidity. The stereo vision algorithm is slightly more robust than laser-line triangulation. Future work will focus on improving the reconstruction and fusion of the two sensing modalities.
Article
Thermodynamics
Nianci Lu, Lei Pan, Simon Pedersen, Ahmad Arabkoohsar
Summary: A novel coordinated control strategy for CCGT is proposed based on a two-dimensional design method of time-scale decomposition and energy-flow coupling analysis. Critical design parameters, such as power assignment ratios and energy storage coefficients, are derived from energy-flow coupling analysis. AGC commands are decomposed into peak-shaving, low-frequency, and high-frequency signals, and a distributed model predictive control is used to synthesize the proposed control strategy for solving large inertia and multivariable control problems.
Proceedings Paper
Engineering, Marine
Patryk Olszewski, Antoni Grabowski, Matej Duncko, Simon Pedersen
Summary: This study provides a review of existing methods for monitoring cathodic protection of seabed pipelines and describes an optimal surveillance method using wireless sensor network and autonomous underwater vehicle.
OCEANS 2023 - LIMERICK
(2023)
Proceedings Paper
Engineering, Marine
Fredrik F. Sorensen, Christian Mai, Malte von Benzon, Simon Pedersen, Jesper Liniger
Summary: This study compares the operational limits of two main sensing modalities, sonar and cameras, in a controlled underwater environment. The results show that the stereo camera provides high fidelity measurements up to a turbidity of 1FTU, while the sonar is unaffected by turbidity up to 6FTU.
OCEANS 2023 - LIMERICK
(2023)
Proceedings Paper
Automation & Control Systems
Malte von Benzon, Jesper Liniger, Fredrik Fogh Sorensen, Simon Pedersen
Summary: This study examines the operating range of a standard compact ROV subject to external disturbances and analyzes its cleaning performance. The results show that waves have a larger effect on the cleaning performance. To achieve comprehensive cleaning under specific sea and current conditions, the ROV needs to be maintained at a certain depth.
Proceedings Paper
Engineering, Marine
Simon Pedersen, Jesper Liniger, Fredrik F. Sorensen, Malte von Benzon
Summary: This paper discusses the problems caused by marine growth on offshore structures, analyzes the different approaches taken by the O&G and wind industries, proposes potential solutions for the future, and points out that the development of ROV technology will bring significant improvements.
Proceedings Paper
Engineering, Marine
Jesper Liniger, Anna Lyhne Jensen, Simon Pedersen, Henrik Sorensen, Christian Mai
Summary: This paper explores the possibilities of increasing automation in marine growth inspection and classification, with specific attention given to sensor technologies and constructing 3D representations of offshore structures. Optical-based methods show potential, but further research is needed to address issues with sunlight and turbidity. Promising approaches in classification using deep learning are identified, however, the lack of relevant image databases for marine growth on offshore structures needs further investigation.
