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ELGA LabWater
ELGA LabWater is the laboratory water brand name of Veolia Water Solutions & Technologies. ELGA manufactures, supplies and services water purification systems for use in general, R&D, healthcare and clinical laboratories. Its offices and distributors are located in more than 60 countries. History ELGA Products Limited was founded in 1937 by Walter Lorch to manufacture domestic electrical appliances, but moved into water purification to overcome the problem of limescale deposits in steam irons. It developed a small cartridge-type deionizer to purify the water. ELGA collaborated with the London School of Pharmacy to develop products aimed at the hospital market, laboratories and general industry. A manufacturing unit was set up in 1959 in Lane End, Buckinghamshire, UK. During the 1960s ELGA became a global supplier of water purification systems. ELGA Group PLC was incorporated in 1984 and became part of Protean PLC in 1992. Protean PLC was acquired by Culligan Water Technol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veolia Water
Veolia Water (formerly Vivendi Water, originally Compagnie Générale des Eaux) is the water division of the French company Veolia Environnement and the world's largest supplier of water services. In 2009, the group posted revenues of €12.56 billion. Of this, 72.9% of turnover comes from Europe; 7.4% from the Americas, 8.5% from Africa, Middle East and India, and 11.2% from the Asia-Pacific region. History The Compagnie Générale des Eaux (CGE) was created in 1853. In 1889, its first research laboratory was established at 52, rue d’Anjou in Paris, France. Veolia Water’s headquarters are still located at this site. 1918 saw the creation of the SADE (Société Auxiliaire des Distributions d'Eau), specialising in water networks and the delivery of drinking water. In 1953, construction began on a CGE water treatment facility at Clay Lane, near London; by 2001, it was the world’s largest ultrafiltration plant, supplying water to 750,000 people in the city. Veolia Water ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ion-exchange Resin
An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange. It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate. The beads are typically porous, providing a large surface area on and inside them where the trapping of ions occurs along with the accompanying release of other ions, and thus the process is called ion exchange. There are multiple types of ion-exchange resin. Most commercial resins are made of polystyrene sulfonate.François Dardel and Thomas V. Arden "Ion Exchangers" in Ullmann's Encyclopedia of Industrial Chemistry, 2008, Wiley-VCH, Weinheim. . Ion-exchange resins are widely used in different separation, purification, and decontamination processes. The most common examples are water softening and water purification. In many cases ion-exchange resins were introduced in such proce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veolia
Veolia Environnement S.A., branded as Veolia, is a French transnational company with activities in three main service and utility areas traditionally managed by public authorities – water management, waste management and energy services. It previously also managed transport services through its subsidiary Veolia Transport (later Transdev) until January 2019. In 2012, Veolia employed 318,376 employees in 48 countries. Its revenue in that year was recorded at €29.4 billion. It is quoted on Euronext Paris. It is headquartered in Aubervilliers. Between 1998 and 2003 the company was known as Vivendi Environnement, having been spun off from the Vivendi conglomerate, most of the rest of which became Vivendi. Prior to 1998 Vivendi was known as Compagnie Générale des Eaux. In 2014, following a major restructuring, the company adopted the unaccompanied Veolia name across its businesses. History 1853–2003: Compagnie Générale des Eaux & Vivendi On 14 December 1853, a water co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veolia Environnement
Veolia Environnement S.A., branded as Veolia, is a French Multinational corporation, transnational company with activities in three main service and utility areas traditionally managed by public authorities – water resource management, water management, waste management and energy services. It previously also managed transport services through its subsidiary Veolia Transport (later Transdev) until January 2019. In 2012, Veolia employed 318,376 employees in 48 countries. Its revenue in that year was recorded at €29.4 billion. It is quoted on Euronext, Euronext Paris. It is headquartered in Aubervilliers. Between 1998 and 2003 the company was known as Vivendi Environnement, having been Corporate spin-off, spun off from the Vivendi Conglomerate (company), conglomerate, most of the rest of which became Vivendi. Prior to 1998 Vivendi was known as Compagnie Générale des Eaux. In 2014, following a major restructuring, the company adopted the unaccompanied Veolia name across its b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrodeionization
Electrodeionization (EDI) is a water treatment technology that utilizes electricity, ion exchange membranes, and resin to deionize water and separate dissolved ions (impurities) from it. It differs from other water purification technologies in that it is done without the use of chemical treatments and is usually a polishing treatment to reverse osmosis (RO). There are also EDI units that are often referred to as continuous electrodeionization (CEDI) since the electric current regenerates the resin mass continuously. The CEDI technique can achieve very high purity, with a conductivity below 0.1 μS/cm. Electrodeionization (EDI) can be differentiated into three stages, so the basics of EDI reside in the simultaneity of the following processes. - Electrodialysis With a continuously applied electric voltage, both positive and negative ions are directed to the electrodes that have a load opposite. The permeable membranes of anions and cations are responsible for directing them to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photooxidation
In polymer chemistry photo-oxidation (sometimes: oxidative photodegradation) is the degradation of a polymer surface due to the combined action of light and oxygen. It is the most significant factor in the weathering of plastics. Photo-oxidation causes the polymer chains to break ( chain scission), resulting in the material becoming increasingly brittle. This leads to mechanical failure and, at an advanced stage, the formation of microplastics. In textiles the process is called phototendering. Technologies have been developed to both accelerate and inhibit this process. For example, plastic building components like doors, window frames and gutters are expected to last for decades, requiring the use of advanced UV- polymer stabilizers. Conversely, single-use plastics can be treated with biodegradable additives to accelerate their fragmentation. Many pigments and dyes can similarly have effects due to their ability to absorb UV-energy. Susceptible polymers Susceptibility to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Degassing
Degassing, also known as degasification, is the removal of dissolved gases from liquids, especially water or aqueous solutions. There are numerous methods for removing gases from liquids. Gases are removed for various reasons. Chemists remove gases from solvents when the compounds they are working on are possibly air- or oxygen-sensitive (air-free technique), or when bubble formation at solid-liquid interfaces becomes a problem. The formation of gas bubbles when a liquid is frozen can also be undesirable, necessitating degassing beforehand. Pressure reduction The solubility of gas obeys Henry's law, that is, the amount of a dissolved gas in a liquid is proportional to its partial pressure. Therefore, placing a solution under reduced pressure makes the dissolved gas less soluble. Sonication and stirring under reduced pressure can usually enhance the efficiency. This technique is often referred to as ''vacuum degasification''. Specialized vacuum chambers, called vacuum degassers, ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultrafiltration
Ultrafiltration (UF) is a variety of membrane filtration in which forces such as pressure or concentration gradients lead to a separation through a semipermeable membrane. Suspended solids and solutes of high molecular weight are retained in the so-called retentate, while water and low molecular weight solutes pass through the membrane in the permeate (filtrate). This separation process is used in industry and research for purifying and concentrating macromolecular (103–106 Da) solutions, especially protein solutions. Ultrafiltration is not fundamentally different from microfiltration. Both of these separate based on size exclusion or particle capture. It is fundamentally different from membrane gas separation, which separate based on different amounts of absorption and different rates of diffusion. Ultrafiltration membranes are defined by the molecular weight cut-off (MWCO) of the membrane used. Ultrafiltration is applied in cross-flow or dead-end mode. Applications Ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microfiltration
Microfiltration is a type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane filter to separate microorganisms and suspended particles from process liquid. It is commonly used in conjunction with various other separation processes such as ultrafiltration and reverse osmosis to provide a product stream which is free of undesired contaminants. General principles Microfiltration usually serves as a pre-treatment for other separation processes such as ultrafiltration, and a post-treatment for granular media filtration. The typical particle size used for microfiltration ranges from about 0.1 to 10 μm.Baker, R 2012, ''Microfiltration, in Membrane Technology and Applications'', 3rd edn, John Wiley & Sons Ltd, California. p. 303 In terms of approximate molecular weight these membranes can separate macromolecules of molecular weights generally less than 100,000 g/mol.Microfiltration/Ultrafiltration, 2008, Hyflux Membranes, accesse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverse Osmosis
Reverse osmosis (RO) is a water purification process that uses a partially permeable membrane to separate ions, unwanted molecules and larger particles from drinking water. In reverse osmosis, an applied pressure is used to overcome osmotic pressure, a colligative property that is driven by chemical potential differences of the solvent, a thermodynamic parameter. Reverse osmosis can remove many types of dissolved and suspended chemical species as well as biological ones (principally bacteria) from water, and is used in both industrial processes and the production of potable water. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side. To be "selective", this membrane should not allow large molecules or ions through the wiktionary:pore, pores (holes), but should allow smaller components of the solution (such as solvent molecules, e.g., water, H2O) to pass freely. In the normal osmosis process, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Purification
Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water that is fit for specific purposes. Most water is purified and disinfected for human consumption (drinking water), but water purification may also be carried out for a variety of other purposes, including medical, pharmacological, chemical, and industrial applications. The history of water purification includes a wide variety of methods. The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination; and the use of electromagnetic radiation such as ultraviolet light. Water purification can reduce the concentration of particulate matter including suspended particles, parasites, bacteria, algae, viruses, and fungi as well as reduce the concentration of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cranfield University
, mottoeng = After clouds light , established = 1946 - College of Aeronautics 1969 - Cranfield Institute of Technology (gained university status by royal charter) 1993 - Cranfield University (adopted current name) , type = Public research university , chancellor = Dame Deirdre Hutton , vice_chancellor = Karen Holford , administrative_staff = 1,800 , students = ()(all postgraduates) , undergrad = , postgrad = , city = Cranfield, BedfordshireShrivenham, OxfordshireEngland , campus = Rural (both) , former_names = Cranfield Institute of TechnologyCollege of Aeronautics , colours = , athletics = , affiliations = ACUPEGASUSEQUISAACSBAMBA M5 UniversitiesUniversities UK , website = https://www.cranfield.ac.uk/ , logo = , footnotes = Cranfield University is a British postgraduate public research university specialising in science, engineering, design, technology and management. Cranfield was founded as the College of Aeronautics (CoA) in 1946. Through the 195 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
