Process Equipment Update


measurement of the PQ’s disinfecting activity. In addition, because the monitor remains outside


the water flow, it can be removed and inspected without interrupting the process, allowing on-site verification using a portable reference UV sensor traceable back to a NIST standard. In addition, material certificates for all the FDA compliant wetted parts and an ability to cope with clean in place/sterilisation in place (CIP/SIP) provides compatibility with food and beverage requirements and above all ensures UV biosecurity of the highest level. Operating at a lower energy level, PureLine D is intended


for general purpose disinfection of water or CIP solutions as part of a multi-barrier system, while the PureLine S and B systems are designed specifically for the disinfection of sugar syrups, liquid sugars, de-aerated liquor (in breweries) and for disinfection of brine in the meat packaging industry.


Unlimited stop-start capability


The PureLine range utilise either high output amalgam or medium pressure UV lamps, whichever is most effective for the application in question. Lamp changing is a simple procedure that can usually be done by on-site personnel with no specialist training. With lamp life up to 12,000 hours and with electronic ballasts and unlimited start-stop and variable output capability on some models, life-time costs and energy consumption are optimised across the range. The entire range is rated to IP54 as a minimum, with


options to IP65, and has a state-of-the-art controller with an on-board message display panel, as well as many other safety and alarm features. UV treatments supplied by Atg UV Technology are used


in a number of key areas to vastly reduce the risk of product rejection and increase shelf life. Additionally full traceability is provided by Atg UV’s state-of-the-art Spectra controllers. One example is bottled water: even high-quality borehole


and spring waters can contain natural flora and fauna. The only appropriate method of disinfection is by UV treatment. This will not affect the natural taste or mineral balance of these distinctive brands, and will vastly enhance shelf life. Another is brewing, where cutting of high-gravity brews


poses risk of contamination by deaerated liquor. UV is an effective and convenient technology, as units function


automatically. Also, CIP rinse systems usually rely on UV for non-chemical disinfection. Yeasts and moulds are a major contaminant in


concentrated liquid sugar solutions and can contaminate the final product. Atg UV has designed a specific range of liquid sugar UV disinfection systems to deal with the high viscosities encountered in sugar solutions up to 67 brix. The SS (sugar solution) range utilises the latest in thin-film quartz and UVC lamp technology, with specially designed UV chambers. According to the company, the leading SS System range has been adopted by leading food and beverage brands and manufactures worldwide.


Slicing and wrapping


In baking, the company’s UV technology is used extensively in both slicing and wrapping units and bread cooling rooms, where bread left cooling in ventilated areas offers the ideal breeding conditions for moulds, and bacteria. When it comes to make-up water, UV systems can


effectively be applied as a final treatment at point of use. Installation can be on a recirculation loop or at strategic points feeding mixing vessels. UV systems can be fully automatic, which is particularly relevant when the water use is batch or intermittent. Process equipment such as sprayers and heat exchangers also benefits from pure water supplies. The company is also seeing a growth in less traditional


applications, for example the disinfection of cranberry juice, orange juice, meat brines and marinades. Most recently it has been used to disinfect ballast water on ocean going vessels in order to prevent to transit of invasive species such as Zebra mussels that get introduced when vessels discharge ballast water at the destination port..


Joint R&D in China


Air Products, a leading global industrial gases and performance materials supplier, has signed a joint research and development (R&D) agreement with South China University of Technology (SCUT) on water purification technology to accelerate the development of sustainable and efficient water treatment solutions, helping local customers meet increasing energy efficiency and environmental improvement targets.


Advantages of UV disinfection S


iemens Water Technologies offers a complete range of ultraviolet (UV) disinfection solutions for municipal


drinking water, 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. Siemens cites a number of technology advantages associated with UV, notably the effective control of all types of microorganisms, including those which are chlorine-resistant, without chemicals. It also improves disinfection efficacy, reduces environmental, health and safety risks, eliminates formation of disinfection by- products, has no effect on the aesthetic qualities


of the water, and raises no over-dosing concerns. For its part, Lenntech also has a long track record in successfully solving individual water quality problems. The company offers offer medium pressure, low pressure and low pressure amalgam disinfection systems, together with special ultraviolet systems. The company’s customers therefore have individually tailored service to solve the most complex of disinfection problems. Among the sectors to benefit are: pharmaceuticals, catering, offshore industries, drinking water industry, food and beverage production and wastewater treatment. n


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