membrane chemical Articles
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Membrane chemical cleaning: why is it required and how is it performed?
Membrane fouling, defined as the accumulation of particles and organic matter at the surface or in the pores of membranes occurs during membrane filtration. Membrane fouling results in membrane performance loss, i.e. lower rejection values, lower permeate flux and higher pressure drop, which translates into higher operational cost. The extent of fouling depends on the feed quality, operating ...
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Mechano-chemical ageing of PES/PVP ultrafiltration membranes used in drinking water production
In water treatment by microfiltration and ultrafiltration, a major concern is the integrity loss or failure of membrane induced by onsite operations, potentially leading to permeate water contamination. This study aims to provide a better understanding of the phenomena responsible for membrane damage by analyzing its causes and effects. The role of sodium hypochlorite exposure conditions and ...
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Two-stage anaerobic fluidized-bed membrane bioreactor treatment of settled domestic wastewater
A two-stage anaerobic fluidized-bed membrane bioreactor (SAF-MBR) system was applied for the treatment of primary-settled domestic wastewater that was further pre-treated by either 10 μm filtration or 1 mm screening. While the different pre-treatment options resulted in different influent qualities, the effluent qualities were quite similar. In both cases at a total hydraulic retention ...
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Respirometric assays of two different MBR (microfiltration and ultrafiltration) to obtain kinetic and stoichiometric parameters
A comparison of two different medium scale MBRs (ultrafiltration and microfiltration) using respirometric methods has been achieved. The ultrafiltration membrane plant (0.034 µm pore size) maintained recirculation sludge flow at seven times the influent flow, and membranes were backwashed every 5 min and chemically cleaned weekly. The microfiltration membrane plant (0.4 µm pore size) maintained ...
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Impact of
Microcystis aeruginosa on membrane fouling in a biologically treated effluentMicrocystis aeruginosa was cultured in biologically treated municipal effluent to simulate blue-green algal bloom conditions in a treatment lagoon. The effect of algae in the early, mid and late phases of growth on membrane fouling, chemical coagulation (alum or aluminium chlorohydrate (ACH)) and hydraulic cleaning on the microfiltration of this effluent was investigated. The effect of M. ...
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Ceramic Membrane Machine Lab & Pilot
The membrane area of CMP pilot machine has the following types: 0.1 m², 0.2 m², 0.5 m², 1 m², 2 m², 3 m², 4.5 m², 5 m², 6 m², 6.5 m², 8 m², 9 m² FEATURES OF CMP PILOT MACHINE Due to higher membrane velocity, reduce the accumulation of pollutants in the membrane surface, increase membrane flux. Good chemical stability, strong acid, ...
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Evaluating membrane performance in recycled water treatment plants for assets replacement strategy
Membranes are an important barrier used in recycled water treatment plants for pathogen removal. Understanding performance over operational life is important to inform membrane replacement. In this study, full scale virus challenge testing was conducted on newly commissioned membranes to validate virus log removal values for accreditation. After six years of operation, the membrane integrity ...
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Electrocoagulation: The Optimized Tool for Reverse Osmosis Pretreatment
Electrocoagulation: The Optimized Tool for RO Preatment Reverse Osmosis Desalination (RO) is used to treat water that comes from a variety of water sources across the world. From the brackish water of certain rivers and lakes, to the sources of tertiary municipal and industrial wastewater for reuse, this technology provides great versatility to its operator. It is because of the variability of ...
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Combination of microalgae cultivation with membrane processes for the treatment of municipal wastewater
The treatment of wastewater by microalgae cultivation has attracted more and more attention. However, the way to harvest microalgae cells from the wastewater and the treatment of the large quantity of residual solution have become critical issues. In this work, a new approach for the treatment of municipal wastewater is presented. The combination of flocculation for removing mainly microalgae ...
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Degreasing Liquid Treatment
Degreasing is a necessary step before any other processing in mechanical industry, in the steel industry and generally speaking in the transformation of raw materials. Degreasing is performed with aid of an aqueous solution containing detergents. The detergents emulsify oil present on the material to be treated; for this reason, oil concentration tends to increase in degreasing treatment baths ...
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Occurrence of perfluoroalkyl and polyfluoroalkyl substances in the water environment and their removal in a water treatment process
Perfluoroalkyl and polyfluoroalkyl substances (PFASs) such as perfluorooctanoic acid (PFOA), and perfluorooctane sulfonate (PFOS) are found in aquatic environments worldwide. The presence of these compounds in the water environment is still unclear, even though direct or indirect discharges of these compounds from industries to the aquatic environment are the potential routes. In this paper, ...
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Evaluation of an emerging water treatment technology: ceramic membranes
Historically, low-pressure membranes (microfiltration (MF) and ultrafiltration (UF)) used in potable water treatment are made of polymers (polysulfone (PS), polypropylene (PP), polyethersulfone (PES), polyvinylidene fluoride (PVDF) etc). Recently, membranes made of ceramic materials (aluminium oxide) have been developed by MetaWater (Japan), Kubota (Japan) and others and is being marketed in the ...
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Enhanced membrane bioreactor process without chemical cleaning
In membrane bioreactors (MBR) for wastewater treatment, the separation of activated sludge and treated water takes place by membrane filtration. Due to the small footprint and superior effluent quality, the number of membrane bioreactors used in wastewater treatment is rapidly increasing. A major challenge in this process is the fouling of the membranes which results in permeability decrease and ...
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Degreasing Liquid Treatment
Degreasing process is a necessary step before any other processing in mechanical industry, in the steel industry and generally speaking in the transformation of raw materials. Degreasing treatment is performed with aid of an aqueous solution containing detergents. The detergents emulsify oil present on the material to be treated; for this reason, oil concentration tends to increase in ...
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Water treatment membrane coating promises chemical-free virus removal
A novel material coating for water treatment membranes promises to improve the removal of water-borne viruses during treatment. This hydrogel coating, known as a zwitterionic polymer hydrogel, was created by scientists from Ben-Gurion University of the Negev and the University of Illinois at Urbana-Champaign. The virus-fighting membrane was created by grafting the new hydrogel coating onto the ...
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Degreasing Liquid Treatment
Degreasing process is a necessary step before any other processing in mechanical industry, in the steel industry and generally speaking in the transformation of raw materials. Degreasing treatment is performed with aid of an aqueous solution containing detergents. The detergents emulsify oil present on the material to be treated; for this reason, oil concentration tends to increase in degreasing ...
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Ceramic Membrane Integrative Equipment Shows Out in the Field of Chemical Fiber Wastewater Treatment
In chemical fiber wastewater treatment project, Jiuwu's ceramic membrane wastewater treatment integrated equipment is used as the core equipment, and the problem of wastewater treatment in chemical fiber production is solved economically and efficiently by using the ceramic membrane purification. Chemical fibre wastewater is one of the most difficult wastewater treatment because of its complex ...
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Keeping you at the forefront of innovation
The water treatment industry predominately uses a number of traditional chemical formulations for the treatment of steam boilers, cooling towers, closed circuits and disinfection of water systems. At B & V Chemicals we realise that innovation is the key to success in any industry, including water treatment. B & V Chemicals has always had a commitment to Research and Development, with new ...
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Wastewater engineers go with the flow
The efficiency of maintenance work has been improved by water treatment engineers employing Intellisonde monitors in their final effluent. Designed primarily to measure water quality, the Intellisondes also measure flow, and this reading is being used to detect the accumulation of debris that necessitates a maintenance visit. Wastewater treatment efficiency is often measured by the analysis of ...
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New urban wastewater treatment with autotrophic membrane bioreactor at low chemical oxygen demand/N substrate ratio
The potential for total nitrogen removal from municipal wastewater has been evaluated in an autotrophic membrane bioreactor running with a low chemical oxygen demand (COD)/N ratio to simulate its combination with an upstream physicochemical process that retains a large proportion of organic matter. The tests were conducted in a laboratory scale submerged membrane bioreactor loaded with a ...
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