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Littérature scientifique sur le sujet « Fouling precursors »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Fouling precursors"

Shetty, Nitin, Marappagounder Ramasamy, and Rajashekhar Pendyala. "Effect of Bulk Temperature on Formation of Crude Oil Fouling Precursors on Heat Transfer Surfaces." Applied Mechanics and Materials 625 (September 2014): 482–85. http://dx.doi.org/10.4028/www.scientific.net/amm.625.482.

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Temperature plays a very important role in the formation of fouling precursors in crude oils which is considered to be the first step before the precursors are either attached to the wall as a deposit or transferred back to the bulk fluid by diffusion. In order to investigate the formation characteristics of fouling precursors in crude oils at different bulk temperatures, a custom-design thin film microreactor is constructed. It is observed during the experiments that tendency to form fouling precursors is higher at higher surface temperatures. The precursor particles once formed continue to g

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Wray, Heather E., Robert C. Andrews, and Pierre R. Bérubé. "Coagulation optimization for DOC removal: pilot-scale analysis of UF fouling and disinfection byproduct formation potential." Water Supply 16, no. 2 (2015): 473–80. http://dx.doi.org/10.2166/ws.2015.157.

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A pilot-scale study was performed to evaluate a coagulant dose which had been optimized for biopolymer (i.e., foulant) removal on subsequent ultrafiltration (UF) fouling, as well as disinfection by-product (DBP) precursor removal. Polyaluminum chloride (PACl) dosages were selected based on a point of diminishing returns for biopolymer removal (0.5 mg/L) and directly compared to that applied at full-scale (6 mg/L). Membrane fouling (reversible and irreversible) was measured as resistance increase over a 48 hour filtration period. DBP formation potential (total trihalomethanes (TTHMs), haloaceti

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Ramasamy, M., and Umesh B. Deshannavar. "Effect of Bulk Temperature and Heating Regime on Crude Oil Fouling: An Analysis." Advanced Materials Research 917 (June 2014): 189–98. http://dx.doi.org/10.4028/www.scientific.net/amr.917.189.

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Semi-empirical threshold fouling models predict higher fouling rates at high surface or film temperatures. Several experimental fouling data reported in literature and from our study were analyzed with respect to increase in surface and bulk temperatures that showed a decrease in fouling rates. The existing threshold fouling models do not adequately describe the phenomenon of decreasing fouling rates with increase in surface or bulk temperatures. The possible causes including the effect of temperature difference, heating regime and solubility of fouling precursors were analyzed and reported.

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Takeuchi, Haruka, Naoyuki Yamashita, Norihide Nakada, and Hiroaki Tanaka. "Removal Characteristics of N-Nitrosamines and Their Precursors by Pilot-Scale Integrated Membrane Systems for Water Reuse." International Journal of Environmental Research and Public Health 15, no. 9 (2018): 1960. http://dx.doi.org/10.3390/ijerph15091960.

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This study investigated the removal characteristics of N-Nitrosamines and their precursors at three pilot-scale water reclamation plants. These plants applies different integrated membrane systems: (1) microfiltration (MF)/nanofiltration (NF)/reverse osmosis (RO) membrane; (2) sand filtration/three-stage RO; and (3) ultrafiltration (UF)/NF and UF/RO. Variable removal of N-Nitrosodimethylamine (NDMA) by the RO processes could be attributed to membrane fouling and the feed water temperature. The effect of membrane fouling on N-Nitrosamine removal was extensively evaluated at one of the plants by

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Azzeh, Jamal, Lizbeth Taylor-Edmonds, and Robert C. Andrews. "Engineered biofiltration for ultrafiltration fouling mitigation and disinfection by-product precursor control." Water Supply 15, no. 1 (2014): 124–33. http://dx.doi.org/10.2166/ws.2014.091.

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A pilot-scale study was conducted to evaluate the impact of several biofiltration enhancement strategies in terms of organic removal to reduce disinfection by-product (DBP) formation potential and mitigate ultrafiltration (UF) fouling. Strategies included nutrient addition (nitrogen and phosphorus) to optimize metabolic degradation of organics, use of hydrogen peroxide (H2O2, peroxide) to improve filter run times, and the application of in-line aluminum sulphate (alum) for biopolymer removal. The impact of media type on performance was also examined (anthracite versus granular activated carbon

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Yang, Yao, Shuai Zhang, Guangfei Yang, Haihui Li, Jinjin Wang, and Wenyan Li. "Biological Activated Carbon Filtration Controls Membrane Fouling and Reduces By-Products from Chemically Enhanced Backwashing during Ultrafiltration Treatment." Water 15, no. 21 (2023): 3803. http://dx.doi.org/10.3390/w15213803.

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Water purification by ultrafiltration (UF) requires regular membrane cleaning via backwashing. In the case of chemically enhanced backwashing (CEB), it can result in the formation of unwanted by-product precursors due to reactions with organic matters present in the backwashing water and accumulating on the membrane. After subsequent disinfection, these precursors are prone to generate trihalomethanes (THMs) and haloacetic acids (HAAs), posing potential risks to the chemical safety of drinking water. However, limited information was available regarding the removal of these disinfection by-prod

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Millanar-Marfa, Jessa, Laura Borea, Mark de Luna, Florencio Ballesteros, Vincenzo Belgiorno, and Vincenzo Naddeo. "Fouling Mitigation and Wastewater Treatment Enhancement through the Application of an Electro Moving Bed Membrane Bioreactor (eMB-MBR)." Membranes 8, no. 4 (2018): 116. http://dx.doi.org/10.3390/membranes8040116.

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High operational cost due to membrane fouling propensity remains a major drawback for the widespread application of membrane bioreactor (MBR) technology. As a result, studies on membrane fouling mitigation through the application of integrated processes have been widely explored. In this work, the combined application of electrochemical processes and moving bed biofilm reactor (MBBR) technology within an MBR at laboratory scale was performed by applying an intermittent voltage of 3 V/cm to a reactor filled with 30% carriers. The treatment efficiency of the electro moving bed membrane bioreacto

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Jamieson, Tamar, Harriet Whiley, Jason R. Gascooke, and Sophie C. Leterme. "Can Aggregate-Associated Organisms Influence the Fouling in a SWRO Desalination Plant?" Microorganisms 10, no. 4 (2022): 682. http://dx.doi.org/10.3390/microorganisms10040682.

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This pilot study investigates the formation of aggregates within a desalination plant, before and after pre-treatment, as well as their potential impact on fouling. The objective is to provide an understanding of the biofouling potential of the feed water within a seawater reverse osmosis (SWRO) desalination plant, due to the limited removal of fouling precursors. The 16S and 18S rRNA was extracted from the water samples, and the aggregates and sequenced. Pre-treatment systems, within the plant remove < 5 µm precursors and organisms; however, smaller size particles progress through the plan

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Bu, Fan, Baoyu Gao, Qinyan Yue, Caiyu Liu, Wenyu Wang, and Xue Shen. "The Combination of Coagulation and Adsorption for Controlling Ultra-Filtration Membrane Fouling in Water Treatment." Water 11, no. 1 (2019): 90. http://dx.doi.org/10.3390/w11010090.

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Ultra-filtration technology has been increasingly used in drinking water treatment due to improvements in membrane performance and lowering of costs. However, membrane fouling is the main limitation in the application of ultra-filtration technology. In this study, we investigated the impact of four different pre-treatments: Coagulation, adsorption, coagulation followed by adsorption (C-A), and simultaneous coagulation and adsorption (C+A), on membrane fouling and natural organic matter removal efficiency. The results showed that adsorption process required a large amount of adsorbent and forme

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Xu, Shunkai, Guangchao Li, Shiqing Zhou, Zhou Shi, and Bin Liu. "Effect of Electrochemical Pre-Oxidation for Mitigating Ultrafiltration Membrane Fouling Caused by Extracellular Organic Matter." Water 15, no. 12 (2023): 2235. http://dx.doi.org/10.3390/w15122235.

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Algal extracellular organic matter (EOM) will cause grievous membrane fouling during the filtration of algae-laden water; hence, boron-doped diamond (BDD) anodizing was selected as the pretreatment process before the ultrafiltration, and the EOM fouling mitigation mechanism and the purification efficiency were systematically investigated. The results showed that BDD oxidation could significantly alleviate the decline of membrane flux and reduce membrane fouling, and the effect was more notable with an increase in oxidation time. Less than 10% flux loss happened when oxidation duration was 100

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Thèses sur le sujet "Fouling precursors"

Borea, Laura. "Advanced MBR processes for wastewater treatment and energy production." Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2491.

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2014 - 2015 More stringent standards on water quality along with the shortage of vater resources have led to the development of advanced wastewater treatment processes, in order to ensure the respect of discharge limits and the reuse of trated water... [edited by author] XIV n.s.

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Li, Xu. "Transparent exopolymer particles (TEP) and their precursors in reverse osmosis (RO) systems: quantification, fouling potential and cleaning." Thesis, Li, Xu (2018) Transparent exopolymer particles (TEP) and their precursors in reverse osmosis (RO) systems: quantification, fouling potential and cleaning. PhD thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/45248/.

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Transparent exopolymer particles (TEP) and their precursors have been identified as critical causal factors in fouling of desalination and other water treatment membranes. TEP and the fractions thereof are composed of a wide variety of organic constituents and size fractions and have conventionally been only quantified by an operational method, specifically, Alcian Blue measurement. For fouling control and mitigation purposes, it is important to accurately measure the amount of both TEP and TEP precursors, their fouling capacity, and their response to cleaning. However, these issues are not we

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Lee, Hsin-Hua, and 李欣樺. "Study on the Effects of DBP Precursors on Fouling Electric Enhanced Membranes." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/69028489851217465635.

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碩士 國立臺灣大學 環境工程學研究所 92 The effect of humic acid size distribution as electric enhanced membrane process under various membrane pressure and electric voltage was investigated. Humic acid solution was divided into three groups, namely G1-25,000~3,000 Da, G2-3,000~500 Da and G3-500〜50 Da, by means of gel filtration chromatography according to their apparent molecular weight. Ultrafiltration behaviors were analyzed by the resistance-in-series model. The results showed that flux declined to the extend of initial flux 85%, 78% and 72% with pressure under 47 kPa, 74 kPa and 98 kPa, respect

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Azzeh, Jamal. "Engineered Biofiltration for Ultrafiltration Fouling Control and DBP Precursor Removal." Thesis, 2014. http://hdl.handle.net/1807/65534.

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Recently, treatment plants have adopted biofiltration to compliment conventional treatment and ozonation. Previous literature has focused on passive applications of biofiltration. In this study, several pilot-scale biofiltration trains were designed in parallel to conventional treatment to investigate the impact of nutrient addition (nitrogen and phosphorus), use of hydrogen peroxide, aluminum sulphate (alum), and different filtration media (anthracite vs. granular activated carbon (GAC)) on biofiltration performance. Parameters measured included organic removal, reduction of DBP precursor, im

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Chapitres de livres sur le sujet "Fouling precursors"

Holberg, Stefan. "Non-Hydrolyzed Resins for Organic-Inorganic Hybrid Coatings." In Materials Science and Engineering. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1798-6.ch030.

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This chapter focuses on resins based on non-hydrolyzed, monomeric and polymeric alkoxysilanes. As alternative to classical sol-gel processing, the resins are applied to a surface without a preceding hydrolysis step. Only after application, hydrolysis and condensation of the alkoxysilyl groups occur by means of atmospheric moisture to result cross-linked organic-inorganic hybrid coatings. While the use of non-hydrolyzed silanes is well established, for example by applying polyethyl silicate as binder for zinc-rich anti-corrosive primers, this chapter describes the chemical structures of various

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Holberg, Stefan. "Non-Hydrolyzed Resins for Organic-Inorganic Hybrid Coatings." In Research Perspectives on Functional Micro- and Nanoscale Coatings. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0066-7.ch005.

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Actes de conférences sur le sujet "Fouling precursors"

Penley, Daniel, and Neil P. Dasgupta. "Spatial Atomic Layer Deposition: Reduced Order Model Towards In-Line Process Control." In ASME 2024 19th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/msec2024-124112.

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Abstract Spatial atomic layer deposition (SALD) is a thin film deposition technique that could provide precise atomic-scale control at a large enough scale for many applications, such as clean energy technologies, catalytic conversion, batteries, and anti-fouling coatings. The spatially separated precursor zones are sequentially exposed to the substrate surface to deposit a film with precise control. If the precursor zones were to intermix during a deposition process, the precise control over film thickness would be lost. Therefore, it is essential to control the location of the precursors wit

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Corsini, Alessandro, and Cecilia Tortora. "Fouling Detection in Low Speed Fan Using Near-Field DIY Sound Pressure Sensors." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57557.

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This work investigates the dynamics of rotating stall of a low speed axial fan in presence of fouling on the blades. Rotating stall is an aerodynamic issue of recognized importance in turbomachinery. The combination of rotating stall and presence of particles of dust and dirt from the surrounding environment, may lead to further issues in terms of performance, stall limit and blades life. In this paper the identification of the rotating stall pattern is carried out using time-resolved sound measurements in the far field region by means of a condenser microphone. The experimental tests are carr

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