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When investing in a cooling tower filtration system, commercial building owners and managers want the confidence of knowing their purchase is well-designed for the larger system’s needs, and the annual cost of maintenance and repairs will be minimal and fall in line with the budget. Side-stream filtration is a method designed to meet each of those requirements as well as provide many other cost- and energy-saving benefits. Why Invest in Side-Stream Filtration? Due to the constant cycling offered by side-stream cooling tower filtration, water can be continually fed into the system, reducing the need for additional water supply. Also, this method makes it less likely that scaling will appear and obstruct heat exchange. Since the system will work more efficiently, less energy is required, resulting in cost savings. Side-stream filtration delivers continuous results through the removal of unwanted suspended particles in the water supply, reducing the need for chemical cleaning agents and lengthening the time necessary between offline maintenance procedures. This method is particularly effective and will deliver a marked improvement in cooling tower systems that are susceptible to fouling from foreign particles, have a high occurrence of scaling and contain components which normally require frequent cleaning. Centrifugal Separators This type of system is most effective at removing solid particles and requires little maintenance for continued operation. Water is forced into the chamber at a high speed, creating a centrifugal force. Solids are propelled downward into a disposal chamber while clean water rises and re-enters the main system. Automatic Screen Filter Automatic screen filters use pressure and suction to remove particles from the incoming supply. As water enters a chamber, it passes through a screening filter which catches and holds materials too large to fit through, while clean, filtered water exits on the other side. As the pressure builds on the filter, a monitoring device signals the outlet valve once a certain threshold is reached. When the outlet valve is opened, the built-up pressure is suddenly exposed to the atmosphere, creating a suction effect which removes the debris caught in the filter. Commonly known as “self-cleaning,” this technology is affordable while offering a high-volume return. Plastic Disc Filter With this type of filter, discs with specific-sized holes are stacked along a central spine within a chamber. Water is forced into the space between each disc and particles are caught in the filters, creating a building pressure. Once the predetermined difference in pressure within the chambers is reached, backflow pushes the cleansed water back through the discs and out of the filtration chamber. Sand Filter Another extremely effective cooling tower filtration system is a sand filter, with two types normally used for cooling tower operation – pressure sand filters and high-efficiency sand filters. Water is directed onto the sand bed where both organic and solid particles are filtered as the water progresses downward toward the outlet drain. The method chosen will be depend heavily on budget, but also on the available space for installation and operation. Get an assessment of your current cooling tower filtration needs to determine if side-stream filtration options are properly suited to the needs of your system.
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