membrane performance Articles
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Pervaporative removal of acrylonitrile from aqueous streams through polydimethylsiloxane membrane
This study describes the successful separation of acrylonitrile (ACN) from dilute aqueous streams using pervaporation process. The influences of ACN feed concentration, permeate pressure, operating temperature, feed flow rate and membrane thickness on the membrane separation performance were investigated. The results showed that with an increase in ACN concentration in the feed solution, the ...
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Energetics for gas separation in microporous membranes
Gas separation by inorganic membranes has proven to be effective at laboratory scales, but is now facing challenges in developing for industrial scales. A particular type of inorganic membrane is the class of porous molecular sieves formed by sol-gel method deposited on ceramic substrates. These molecular sieve silica (MSS) membranes are ideally suited to high temperature He, H2, CO2 and CH4 ...
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The effect of wastewater pretreatment on nanofiltration membrane performance
Membrane fouling is considered a serious obstacle for operation and cost efficiency in wastewater treatment using nanofiltration (NF). However, pretreatment is the most practical way to reduce this prior to NF. In this research, two types of wastewaters were pretreated with different methods prior to NF to examine the effect of pretreatment on membrane fouling in terms of turbidity, chemical ...
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Study of fouling in two-stage reverse osmosis desalination unit operating without an inlet pH adjustment: diagnosis and implications
In the current work, the diagnosis of a reverse osmosis desalination unit is reported. Over the two last decades, the studied desalination unit was supplying a 1,200 bed hotel. The feed water was driven from a well near the sea. The desalination unit has two stages giving an average recovery equal to 81%. The behaviour of all water streams with respect to aggressiveness and scaling tendency ...
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Study of cyanide wastewater treatment by dispersion supported liquid membrane using trioctylamine and kerosene as liquid membrane
A certain amount of cyanide is present in wastewater of various industrial processes, such as wet extraction of gold, coal processing, electroplating and other industries. In this work, an experimental study regarding transport of cyanide through a dispersion supported liquid membrane was performed. A model was established to describe the reaction and transport of CN(I) in the supported liquid ...
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A novel positively charged membrane based on polyamide thin-film composite made by cross-linking for nanofiltration
In this paper, a novel positively charged membrane was prepared through interfacial polymerization technique between polyethyleneimine in aqueous phase and trimesoyl chloride in organic phase. Next, cross-linking of polyamide (PA) layer using ρ-xylylene dichloride (XDC) and glutaraldehyde (GA) was studied. The influences of cross-linking concentrations on the separation and permeation ...
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Continuous bioelectricity production and sustainable wastewater treatment in a microbial fuel cell constructed with non-catalyzed granular graphite electrodes and permeable membrane
Oxygen has been so far addressed as the most preferable terminal electron acceptor in the cathodes of microbial fuel cells (MFCs). However, to reduce the oxygen reduction overpotential at the cathode surface, eco-unfriendly and costly catalysts have been commonly employed. Here, we pursued the possibility of using a high surface area electrode to reduce the cathodic reaction overpotential rather ...
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Evaluation of the low pressure RO and NF membranes for an alternative tyreatment of Buyukcekmece Lake
The recent development of new generation LPRO and LPNF membranes has received attention for application in the field of wastewater and water treatment through an increasingly stringent regulation for drinking water purposes and water reclamation. This paper presents the pilot scale membrane separation studies on Buyukcekmece Lake in Istanbul with low pressure reverse osmosis (LPRO) and low ...
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STRO Leachate Treatment Membrane
ST membrane technology is a new structural membrane module specially developed for leachate and high salt wastewater treatment, which adopts spiral membrane structure, and the membrane adopts industrial anti-pollution RO membrane or NF membrane, and the grid channel adopts parallel grid structure which is different from the general spiral membrane, so that it can be used for long-term stable ...
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Synthetic organic polymer fouling in municipal wastewater reuse reverse osmosis
A full scale waste water reuse plant suffered from irreversible fouling of the reverse osmosis (RO) membranes. The major suspect of fouling is cationic organic polymers applied in the wastewater sludge treatment. Thus, the purpose of this research is to study the effect of six cationic polymers, applied in the plant, on RO membrane performance. The filtration and adsorption experiments with 4 ...
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Preparation and characterization of fouling-resistant photocatalytic metal membrane embedded with self-organized TiO2 nano tube
A self-organized nano-structured, photocatalytic TiO2 membrane with large surface area of anatase crystallites was successfully fabricated by anodization. The nano-structured anodized TiO2 membrane was characterized using SEM, XRD and TEM techniques and the operational parameters to fabricate such as anodization time and applied anodic potential were also investigated. The anodized TiO2 membrane ...
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Cost saving case study using a calcium sulphate specific antiscalant
Abstract Extensive extraction from aquifers often leads to deterioration in water quality. This is usually seen as an increase in the soluble salt levels which, over time, has a detrimental effect on membrane performance. A limiting factor in the efficiency of membrane operation is the recovery rate that can be achieved, particularly with ‘brackish’ water operation. A high recovery ...
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Preparation of thin-film composite polyamide reverse osmosis membranes
Thin-Film Composite (TFC) polyamide membranes in spiral wound configuration are widely used in seawater desalting plants worldwide because of their superior solute-rejecting properties and attractive water permeation rates. TFC polyamide membranes are three layered membranes, prepared in two stages wherein conventional phase separation and interfacial polymerisation techniques are combined to ...
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Effect of membrane characteristics on the performance of membrane bioreactors for oily wastewater treatment
Influence of membrane material and pore size on the performance of a submerged membrane bioreactor (sMBR) for oily wastewater treatment was investigated. The sMBR had a working volume of about 19 L with flat sheet modules at the same hydrodynamic conditions. Five types of micro- and ultra-polymeric membranes containing cellulose acetate (CA), cellulose nitrate (CN), polyamide (PA), polyvinylidene ...
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Real-time monitoring of membrane bioreactors with 2D-fluorescence data and statistically based models
The application of membrane bioreactors (MBR) for wastewater treatment is growing worldwide due to their compactness and high effluent quality. However, membrane fouling, mostly associated to biological products, can reduce MBR performance. Therefore, it is important to monitor MBRs as close to real-time as possible to accelerate control actions for maximal biological and membrane performance. ...
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The innovative Osmotic Membrane Bioreactor (OMBR) for reuse of wastewater
An innovative osmotic membrane bioreactor (OMBR) is currently under development for the reclamation of wastewater, which combines activated sludge treatment and forward osmosis (FO) membrane separation with a RO post-treatment. The research focus is FO membrane fouling and performance using different activated sludge investigated both at laboratory scale (membrane area of 112 cm2) and at on-site ...
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VSEP provides crystal clear permeate and recovers precious metals from the mining leachate at 97% recovery
A unique membrane filtration system, known as V✧SEP (Vibratory Shear Enhanced Process), was developed by New Logic of Emeryville, California. The technology employs vibrational oscillation of an advanced polymeric membrane to improve the throughput and to prevent colloidal fouling of the membrane surface. This new technology provides a innovative and cost effective method of recovering ...
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Nanofiltration: properties and uses
Untitled Document Koch Membrane Systems' Henia and Jorge Yacubowicz outline the uses and benefits of nanofiltration. Modern crossflow filtration technology has principally evolved during the last thirty years, following the significant advancements in polymer chemistry over the same time. Today, a vast majority of crossflow filtration installations utilise polymeric ...
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Recycling of spent filter backwash water using coagulation-assisted membrane filtration: effects of submicrometre particles on membrane flux
Membrane separation technology has been widely used for recycling of spent filter backwash water (SFBW) in water treatment plant. Membrane filtration performance is subject to characteristics of the particles in the SFBW. A bench-scale microfiltration (MF) coupled with pre-coagulation was set up to evaluate the recovery efficiency of SFBW. Effect of particle size distribution and zeta potential ...
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Comparative study on membrane fouling between membrane-coupled moving bed biofilm reactor and conventional membrane bioreactor for municipal wastewater treatment
This study compared the performance between membrane-coupled moving bed biofilm reactor (M-MBBR) and a conventional membrane bioreactor (MBR) in parallel. Extensive tests were conducted in three pilot-scale experimental units over 6 months. Emphasis was placed on the factors that would affect the performance of membrane filtration. The results showed that the concentrations of soluble microbial ...
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