Process Equipment Update
operation that takes only a few minutes and can be carried out by general maintenance staff.
Swedish drinking water Xylem has won a contract to provide UV drinking water treatment solutions to the largest UV disinfection project ever undertaken in Sweden. The Xylem solutions will help deliver clean, treated drinking water to 900,000 people across 16 municipalities. The facility will have the capacity to handle a potential 25 per cent increase in water volume to support future population growth. The company will provide four WEDECO K-series
UV disinfection systems to upgrade the Sydvatten waterworks in the Scania region in southern Sweden. Xylem’s UV systems were chosen for their flexible and innovative design, low lifecycle costs, negligible environmental impact and ability to handle large volumes of water in the most efficient manner possible, while catering to potential future plant expansion. The Sydvatten waterworks drinking water treatment
plant has been in operation since 1966. Xylem’s UV systems will complemaent existing traditional treatment methods to eliminate bacteria, viruses and parasites. In a separate move, Xylem has expanded its offering
of WEDECO UV disinfection solutions specifically developed for the tank-based aquaculture industry. Xylem’s new closed-vessel WEDECO BX and Quadron series UV systems are designed for inactivating fish pathogens. The systems are contained in duplex stainless steel
reactors capable of resisting the corrosive effect of saltwater. The new WEDECO units will enable customers to
efficiently handle pressurised flows ranging from 10 to more than 4000m3
/h. Large-scale fish farms in European countries such as
Norway, a country with some of the longest established and most advanced aquaculture industries, rely on
Xylem’s disinfection equipment to protect their aquatic livestock from the spread of diseases and to ensure clean, safe water for their aquaculture businesses. Xylem’s aquaculture UV solutions are approved by the Norwegian Veterinary Institute (NVI) and validated according to the United States Environmental Protection Agency (EPA) standards. For its part Siemens Water Technologies offers
a complete range of UV disinfection solutions for industrial, commercial, aquatic and high-purity applications. “UV irradiation can be used for multiple purposes
in water treatment, but is primarily employed as a disinfection process that inactivates waterborne pathogens without chemicals. For other applications, UV is used for the removal of organic and inorganic chemicals, including chlorine, chloramines, ozone and total organic carbon (TOC). When combined with oxidants such as ozone or
hydrogen peroxide, or semiconductors such as titanium dioxide, UV can be used for the oxidation of refractory chemicals such as chlorinated solvents, taste and odour compounds, and other emerging contaminants,” notes the company. While the advantages of UV disinfection have been
realised and the technology successfully employed worldwide for decades, Siemens says that the primary advantage of being able to effectively control all types of microorganisms, including those which are chlorine- resistant, without chemicals has numerous benefits for municipal, industrial, commercial and aquatics customers. In addition to disinfection, UV is also very effective for TOC removal, destruction of chlorine, chloramines and ozone. So, overall, UV: improves disinfection efficacy;
reduces environmental, health and safety risks; eliminates formation of disinfection by-products; does not alter the aesthetic qualities of the water; and eliminates any concerns about ‘over dosing’. ■
Pumps aid the recovery of rare minerals I
n early 2013, Watson-Marlow Pumps Group supplied no less than 21 positive displacement pumps to British Fluorspar
Ltd, the UK’s sole fluorspar producer. The pumps, which include 12 of the latest Qdos no-valve metering pumps, have all been set to work on vital flotation duties at the company’s Peak District facility. The mine reopened in May 2012 following closure 18 months beforehand. With Watson-Marlow pump technology, the site is producing 60,000 tonnes of fluorite every year.
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Acid grade fluorspar (fluorite) is a relatively rare industrial mineral. The UK’s main reserves are now found solely within the Southern Pennine orefield in the Peak District National Park. Extraction can be by open cast methods, often to considerable depths, or by underground mining The company today comprises an
underground operation at Milldam Mine, open pit extraction at Tearsall Quarry, and processing operations at Cavendish Mill. When the site was re-opened last
year, British Fluorspar was keen to source new pumps that represented 21st century technology: efficient, reliable, precise, low maintenance, clean and user-friendly. The company consulted an external consultancy and the advice was: consider peristaltic. The chemical reagents handled include methyl isobutyl carbinol, sodium isopropyl xanthate, sodium carbonate, sodium sulphide and sodium silicate. ■
For more information, visit
www.wmpg.co.uk
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