What is a cooling tower water treatment system?
A cooling tower water treatment system is a collection of technologies that removes harmful contaminants from the feed water, circulation water, and/or blow down of your cooling tower.
What is the operation of a cooling tower water treatment system?
Specific treatment method vary based on the cooling tower's requirements and the quality/chemistry of the feed and circulation water, but a typical cooling tower water treatment system will often comprise the following steps:
1: Intake of makeup water for cooling towers: Makeup water, or the water that replaces bled, evaporated, and spilled water from the cooling tower, is pulled from its source, which might be raw water, city water, city-treated effluent, in-plant wastewater recycling, well water, or any other surface water source. You may or may not require treatment here, depending on the quality of the water. If a water treatment system is required at this stage of the cooling tower water process, it commonly eliminates hardness and silica or stabilizes and regulates the pH.
2: Reverse Osmosis or Ultrafiltration: This step is usually to filter the cooling tower water to eliminate any suspended particles such as silt, turbidity, and some forms of organic materials. This is frequently advantageous early in the process since removing suspended particles upstream can help prevent membranes and ion exchange resins from fouling later in the pretreatment process. Depending on the type of filtration utilized, suspended particles as small as one millimetre can be eliminated.
3: Chemical addition: Typically, chemicals are used at this stage of the process ascorrosion inhibitors (for example, bicarbonates) to neutralize acidity and safeguard metal components, algaecides and biocide (e.g., bromine) to inhibit microbe and biofilm growth and scale inhibitors (for example, phosphoric acid) to keep pollutants from generating scale deposits.
4: Filtration on the sid?e-streams: If the cooling tower water is to be recirculated throughout the system, a side-stream filtering unit will be useful in eliminating any troublesome pollutants introduced by drift contamination, leaks, and so on. If your cooling tower water treatment system requires side-stream filtration, approximately 10% of the flowing water will filter through. It is often made up of a high-quality multimedia filtering unit.
5: Blowdown treatment: The final stage of cooling tower water treatment is the blowdown or bleed from the tower. Depending on how much water the cooling plant needs to circulate for adequate cooling capacity, facilities may choose to recycle and recover the water using some sort of post-treatment, such as reverse osmosis or ion exchange, especially in areas where water may be limited. This enables the concentration and removal of liquid and solid waste, while purified water may be returned to the tower and reused.
Efficient re-use of cooling tower water
Among the various water-required components of every industrial plant, cooling towers provide a substantial possibility for water reuse. Because of the large demand for water, the relatively poor quality of water required, and the inexpensive cost of implementation, cooling towers are typically the most prevalent industrial re-use solution.
Reclaimed water from on-site or municipal sources, including wastewater from industrial operations and municipal wastewater effluent, can be used in cooling towers. Clearly defining the value of water will assist businesses in identifying areas where they may optimize their water consumption and, eventually, generate a return.
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