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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 69 for “"Membrane fouling"”.
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Membrane Fouling Mitigation with Water Hammer
Membrane technology has proven to become a prolific separation technique in many industries. However, its widespread application has been limited by fouling. Fouling results in a decline in membrane performance and requires regular chemical cleaning to sustain the operation. This thesis focuses on …
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Membrane Fouling In Cold Microfiltration Of Skim Milk: Mechanisms And Control
… and dairy products. The main challenge in MF is membrane fouling, which leads to a significant decline in permeate flux over time. This work aimed to elucidate the mechanisms of membrane fouling in cold (6C) MF of skim milk and optimize a CO2 backpulsing technique that can diminish membrane …
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Examination Of Methods To Reduce Membrane Fouling During Dairy Microfiltration And Ultrafiltration
Pressure-driven membrane filtration processes such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) provide opportunities for the dairy industry to better utilize milk by separating its components based on size. However, widespread adoption of some of …
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Effect of solids retention time in membrane bioreactors on reverse osmosis membrane fouling
… there is an increasing interest in water reuse. Membrane bioreactors (MBRs) are commonly used in wastewater treatment plants, though reuse of treated wastewater for potable purposes requires more advanced treatment. Reverse osmosis (RO), a water treatment process commonly used for drinking water, …
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Monitoring, modeling, and controlling membrane fouling and concentration polarization in reverse osmosis systems
… The development of thin-film composite (TFC) membranes recently with improved selectivity, permeability, and durability has significantly enhanced the efficiency and reliability of the RO systems. Despite these advantages, membrane fouling and concentration polarization (CP) remain as the key …
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Implementing Electrochemical Impedance Spectroscopy for the In Situ Analysis Of Conducting-Membrane Fouling
… and industrial productivity continue to rise, membrane filtration technologies provide a compelling solution for the production of clean water. Membranes are versatile, energy-efficient, and highly effective, yet they suffer from the indomitable problem of fouling. Abundant research has been …
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Investigation of Membrane Fouling and Cleaning in Direct Contact Membrane Distillation of Municipal Wastewater
… water and would require additional treatment. Membrane distillation may be applicable in some circumstances to treat the effluent from municipal wastewater treatment plants with a low grade heat source for direct potable reuse. This project investigated the chemical cleaning efficiency of …
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Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)
"Hence, NOM aggregation was experimentally evaluated by dynamic light scattering measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of …
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Investigation of effect of dynamic operational conditions on membrane fouling in a membrane enhanced biological phosphorus removal process
The membrane bioreactor (MBR) is becoming increasingly popular for wastewater treatment, mainly due to its capability of producing high quality effluent with a relatively small footprint. However, high plant maintenance and operating costs due to membrane fouling limit the wide spread application …
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Formation and evaluation of the filterability of aerobic granules in a granular sludge membrane bioreactor
… sludge sequencing batch reactor (SBR) and membrane bioreactor (MBR) were combined in an attempt to develop an aerobic granular sludge membrane bioreactor (GMBR). The objectives were to determine the mechanisms controlling the formation of granules and granule stability in the GMBR as well …
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Effect of Coagulation Pretreatment on Membrane Filtration Performance
… conditions under which coagulation can improve membrane performance has been developed. Improved understanding of this relationship allows microfiltration and ultrafiltration to be applied to a wider variety of water treatment situations. In situations where coagulation can reduce membrane …
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Fouling in membrane technology for produced water treatment: Assessing mechanisms, mitigation, and CFD Analysis
… sustainability has become a pressing reality. Membrane-based technologies for oily wastewater separation have grown in popularity due to their energy efficiency, chemical/thermal resistance, and low cost. The membrane can separate a wide range of oily wastewater effluents and deliver good …
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A novel bioadsorption-flocculation fluidized bed bioreactor prior to membrane filtration for wastewater treatment and reuse
… can minimize environmental and health risks. Membrane technology has been developed as one of the reliable treatment methods. However, it has some limitation. Besides the high operation costs, membrane fouling is a major obstacle for the widespread application of this technology. The …
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Causes and analysis of failures in in-situ microscopy observation for the characterization of scaling in membrane distillation membranes
In membrane technology at large, fouling limits membrane performance and membrane lifespan. In the case of reverse osmosis membrane distillation (MD) involving fluid mixtures of inorganic elements, inorganic foulants build up on membrane surfaces, and reduce the flux of fluids across a membrane. …
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Fouling of Aluminum Oxide Microfiltration Membranes by Semi-Synthetic Metal Working Fluids
The modeled membrane fouling mechanisms were validated through the reformulation of a semi-synthetic MWF designed to have greater microemulsion stability. It was experimentally verified that the new fluid did not see significant aggregation. Accordingly this fluid did not show evidence of …
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A sponge-based moving bed bioreactor for micropollutant removal from municipal wastewater
… chemicals and pesticides. A moving bed-submerged membrane bioreactor (MB-SMBR) was also evaluated in terms of micropollutant removal and membrane fouling. During the batch experiments, non-acclimatized (virgin) sponge showed significant and rapid sorption of hydrophobic compounds. Acclimatized …
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Role of extracellular polymeric substances and metals in fouling of membranes in the wastewater treatment
The use of membrane bioreactors (MBRs) for wastewater treatment has been increasing since the 1990s and is gaining more importance due to rising demands for water in general. There is yet one main limitation in full-scale applications of MBRs: the membrane fouling, leading to a substantial loss of …
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Organic fouling of desalination membranes
… any water source, but it is susceptible to membrane fouling, which can reduce product water quality and raise energy consumption. Fouling can be reduced through (energy-intensive) pretreatment, delayed by membrane coatings, and partially reversed by cleaning. However, poor understanding of …
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Addressing the Downstream Processing Challenges Within Manufacturing of Oncolytic Rhabdoviruses
… relies on a combination of chromatography and membrane-based processes to remove process-related (e.g. host-cell proteins and nucleic acids) and product-related impurities (e.g. aggregated virus particles). This thesis explores various methods that can potentially be used to address the …
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Modelling and Simulation of Membrane Bioreactors for Wastewater Treatment
… of a dynamic mathematical model of an immersed membrane bioreactor (iMBR) for wastewater treatment. This thesis is organised into three parts, each one describing a different set of tasks associated with model development and simulation. In the first part, the Author qualitatively and …
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