Wastewater Management
Fig. 2. Installing the right high efficiency filtration technology industry will create a significant return on investment.
The discolouration is a product
of the corrosion that is taking place naturally within the system, and this corrosion reduces the heat transfer from the heat source to the water, and then from the water to the heating/ cooling outlet. A double energy whammy!
In addition, if chemicals are used
to treat this dirty water, then the effectiveness of the chemical treatment will be reduced because of the high solid load within the water. Past examinations of this process
have shown filtration to remove particulates down to 10 micron can improve heat transfer significantly, but tests on many systems also show that the majority of this contamination is between 1.0 micron and 10 micron. IPS believes that a saving of 15-20% in total energy costs in this process can be readily achieved. The solution is to clean up the
heating/cooling water using reliable filtration to less than 1.0 micron connected to both the hot and cold water system.
A typical system using 100kw
chiller and equivalent heater can use 250,000kw per annum for a nine-hour operation, five days a week. Many systems are running continuously to minimise energy losses so this figure could be as high as 870,000kw hours per year.
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Assuming the losses are only 15%, this means a loss of 35,000kw per hour per year. If the system is on 24 hours a day this cost increases to over 130,000kw per hour per year, all of which could be recovered through investing in proper filtration that could give a return on investment in less than 10 months. Finding effective water filtration
technology that will provide significant savings on water, downtime and energy whilst increasing productivity and efficiency has been a real issue for many years until CrossFlow HEMF was launched. With more and more organisations
installing and running this technology the results speak for themselves and this year IPS received approval by the Drinking Water Inspectorate (DWI) for the application in England and Wales of CrossFlow HEMF by relevant water companies for public water supply purposes. Process water users can save money
by the installation of CrossFlow HEMF, and at the same time reduce operating costs. This technology will filter water
down to levels below 1.0 micron, reliably producing a supply of clean water not only free of solids contamination such as sand, grit and iron, but also reducing bacteria, phages and spores such as cryptosporidium. n
Steve Cupples is an engineer and the managing director of Industrial Purification Systems (IPS), Abertillery, Blaenau Gwent, Wales.
www.industrial-purification.co.uk
By reducing the total biological and organic loading from water, chemical dosing is more effective as there is less of a challenge. This in turn often results in significant chemical use reduction, which is better for the water user, better for the environment and reduces operational costs. Industries that have installed this technology have reported a return of investment in less than six months; in fact some have achieved payback in three.
The simple fact is if an organisation can clean up process water and re-use it just one more time it will effectively reduce its process water costs by a staggering 50%.
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