WATER & WASTE TREATMENT
A GOOD TIME TO HEALTH CHECK COOLING TOWERS
With increasing concern about the possible presence of harmful chemicals in facility discharges, more and more cooling tower operators are aiming to reduce chemical use and turning to chemical-free ultraviolet disinfection
1Reference to United
Nations SDG's does not imply the endorsement of the United Nations
Evoqua describes the benefits of both its non- chemical and chemical disinfection solutions
opportunity to review and update your cooling tower treatment in the context of the UN’s Sustainability Development Goals1 (SDGs). Evoqua is responding to these evolving water treatment demands with an expanding portfolio of more sustainable solutions including electrochlorination and UV disinfection.
W
hilst the pandemic has led to a temporary downturn in industrial activity, it provides a good
Biocides are, of course, effective against
most bacteria and viruses that are found in cooling towers, but these chemicals have drawbacks. Storing and handling chemicals like sodium hypochlorite occupies a good deal of space and they can degrade in storage losing their efficacy, and spillages or high concentrations in blowdown can be an environmental hazard. Evoqua’s OSEC L electrochlorinator produces safe, low strength sodium hypochlorite solution from sodium
MIXING SYSTEM HANDLES POULTRY WASTEWATER
Watermark Projects (part of engineering services company, W.A Cooke & Sons) has introduced a Landia mixing system to help handle wastewater at an expanding organic poultry producer in South Wales. Prior to the effluent being treated by Watermark Projects’ bespoke DAF (Dissolved Air Flotation) as part of their design and build service, Landia’s AirJet will keep the balance tank aerated, ensuring that solids are kept in suspension. Comprising a Landia Chopper Pump and a venturi nozzle
(ejector) that sucks in air (and therefore oxygen) and then mixes the wastewater, the AirJet eliminates the need for compressors, bottom-mounted diffusers and advanced controls. Alistair Fielding, water projects manager for Watermark Projects,
said: “Landia equipment is always very reliable; easy to install and maintain. We know we can depend on it to deal with the peaks and troughs of this application, including after clean-down in the poultry processing plant when the wastewater is more contaminated. Working on the specification with Landia was very straightforward. They are always quick to respond.” He added: “Together with our DAF system, which is built in-house,
Landia’s AirJet plays an important part in the help we are giving our poultry customer in reducing their environmental impact – significantly reducing their operational costs, as well as ensuring that they achieve local discharge consent.” The Landia MPTKR-I Chopper Pump for the externally-mounted AirJet, is a soft-start, 1500rpm, 7.5kW unit, mixing and aerating screened poultry effluent with a pH of 4-8 in an above-ground 300m3
steel
balance tank. Landia
T: 01948 661 200
www.landiaworld.com
Evoqua Water Technologies
https://www.evoqua.com/en-GB/markets/ applications/cooling-tower-water-treatment/
38 MARCH 2021 | PROCESS & CONTROL
chloride, the same salt that you use to regenerate the cooling tower make-up water softener. Salt is not only safer and easier to handle; you save on transportation associated with bulk chemical supply, reducing your carbon footprint. The only other input is electricity which, if sourced from renewables, helps to deliver on your SDG commitments. With increasing concern about the possible
presence of harmful chemicals in facility discharges, more and more cooling tower operators are aiming to reduce chemical use and turning to chemical-free ultraviolet disinfection. UV has commonly been applied in markets as diverse as potable water supply, aquaculture, food & beverage, to swimming pools. It inactivates a wide range of microorganisms and bacteria, including chlorine-resistant microbes like Cryptosporidium and has been shown to be effective against many viruses. UV disinfection eliminates chemical handling hazards and reduces the environmental impact associated with biocide use. Self-sufficiency and resilience are of
increasing importance to engineers and environmental managers, and the option to use safer products to operate in a sustainable way is increasingly attractive. Evoqua’s combined chemical and non-chemical disinfection solutions reduce energy usage, minimise chemical consumption and extend the life of your water treatment process equipment. Evoqua also offers solutions to support water reduction, reuse, or recycling of cooling water which contributes to a stronger and more sustainable circular economy.
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