Choosing the Right Cooling Tower Side Stream Filter

Water treatment in cooling towers plays a vital role in the effectiveness and durability of industrial cooling systems. The procedure entails the removal of contaminants and the management of microorganisms whose proliferation may result in corrosion, scaling, and other problems. This article will go through several cooling tower water treatment options and offer advice on how to pick the best cooling tower side stream filter.

Figure 1 Cooling tower water treatment.

What does Cooling Tower Water Treatment Entail?

A cooling tower is a heat removal device that cools water vapor into lower-temperature water and discharges the waste heat of the system to the atmosphere. Cooling tower water treatment is the process of cleaning and improving the quality of the water used in cooling towers.

Typically, this requires employing several methods, including filtration, chemical treatment, and disinfection, to remove pollutants including minerals, bacteria, and algae. Cooling system corrosion, mineral buildup, and microbiological growth are all prevented via cooling tower water treatment. It promotes the safe and effective functioning of the cooling tower and the whole system.

What does Cooling Tower Water Treatment Entail

Cooling Tower Water Treatment Methods

It is essential for guaranteeing the efficacy of cooling towers and preserving machinery from rust and scaling. Different methods, including side-stream filtration, ultrafiltration, ion exchange, distillation, and chemical treatment, serve to purify water in cooling towers.

● Side-Stream Filtration

As part of the sidestream filtration program, some cooling tower water is filtered before being redirected to the cooling tower. This method is commonly used to remove suspended solids and other contaminants that can cause scaling and corrosion.

● Ultrafiltration

A membrane is used in the ultrafiltration process, which purifies cooling tower water of particles and other impurities. This method is highly effective for removing bacteria, viruses, and other microorganisms, as well as dissolved solids and other contaminants.

Figure 2 Ultrafiltration.

● Ion Exchange Treatment

Ion exchange is a process that uses a resin or other material to remove ions from the cooling tower water. This method is commonly used to remove hardness ions, such as calcium and magnesium, and to control pH levels.

Ion Exchange Treatment

● Distillation

Distillation is a process that uses heat to separate water from contaminants. This method is commonly used to remove dissolved solids and other impurities from the cooling tower water.

● Chemical Treatment

Chemical treatment is a process that uses chemicals to control the growth of microorganisms and to prevent scaling and corrosion. This method is commonly used to add biocides and algaecides to the cooling tower water, as well as to control pH levels.

The Essence of Cooling Tower Water Treatment

1. Preventing Biological Growth

For microorganisms like bacteria, algae, and fungi, cooling tower water makes an excellent breeding habitat. These organisms can thrive in the warm, moist environment of a cooling tower, and can cause a variety of problems if left untreated. Regular water treatment can help prevent the growth of these organisms, keeping the cooling tower clean and free of harmful contaminants.

2. Maintaining Water Quality

The quality of the water used in the cooling tower is maintained with the aid of cooling tower water treatment. This includes regulating pH levels, eliminating dissolved sediments and other contaminants, maintaining the right temperature and flow velocity of the water, and more. By preserving the water’s purity and ideal pH balance, cooling tower water treatment can help to prevent damage to the tower itself as well as to any equipment that comes into contact with the water.

Maintaining Water Quality

3. Reducing Corrosion

Cooling tower water treatment helps reduce corrosion and damage to cooling towers and any associated equipment. This is particularly important for towers made of metal, as corrosion can weaken the structure and reduce its lifespan. Inhibitors of corrosion can be added to water to assist stop corrosion, and routine cleaning and maintenance can help get rid of any accumulation of corrosion-causing elements.

4. Lowering Energy Costs

Properly treated cooling tower water can reduce energy bills during use. This is because clean, well-maintained water is more efficient at transferring heat, which means that the cooling tower can operate more efficiently and use less energy. Additionally, regular water treatment can help to prevent scaling and fouling of the tower, which can also reduce energy consumption.

Figure 3 Cooling tower water filter.

5. Improving Indoor Air Quality

Cooling towers can affect indoor air quality if not properly maintained. Microorganisms and other contaminants in the water can be released into the air, potentially causing health problems for those who are exposed. Regular water treatment can help to prevent the growth of these organisms, and can also remove any particles that may be present in the water, improving indoor air quality.

6. Complying with Regulations

Regarding the treatment of cooling tower water, there are rules in existence in many places. These regulations are in place to protect public health and the environment. By regularly treating the water in the cooling tower, facilities can ensure that they are in compliance with these regulations, and avoid any fines or penalties.

7. Protecting the Environment

Cooling tower water that has been properly handled can aid in environmental preservation. This is because it can prevent the release of harmful contaminants into the air and water. Additionally, by reducing energy consumption, cooling tower water treatment can help to lower greenhouse gas emissions and reduce the facility’s carbon footprint.

Side Stream Filters for Cooling Towers

Maintenance of cooling towers includes using side stream filters. These filters are installed in a small portion of the total recirculating water flow, typically 5-20%, and are used to remove suspended solids, oils, and other contaminants from the recirculating water. These contaminants can build up and cause issues such as decreased heat transfer efficiency, increased scaling, and increased corrosion.

Figure 4 Cooling tower side stream filter.

● Sand Filters

These filters use a bed of sand to remove suspended solids. Water is passed through the sand bed, and the suspended solids are trapped in the sand. Sand filters are quite inexpensive, but they need to be back-washed frequently to get the solids that have been trapped out.

● Cartridge Filters

These filters use a cartridge filled with filter media, such as pleated paper or polypropylene, to remove suspended solids and other contaminants. Cartridge filters are relatively easy to maintain, but the cartridges will need to be replaced periodically.

● Automatic Self-Cleaning Filters

These filters use a centrifugal action to separate suspended solids from the water. They are typically more expensive than other types of filters, but they require less maintenance.

Automatic Self-Cleaning Filters.

● Microfiltration Filters

Microfiltration is a filtration process that uses a membrane to remove suspended solids, bacteria, and other contaminants from the water.

Choosing the Perfect Cooling Tower Side-Stream Filter

Cooling towers are used by a variety of industries, including HVAC, power generation, and manufacturing to extract heat from flowing water that is necessary to cool various processes. These include:

● Flow Rate

When choosing a side stream filter, it’s crucial to take the circulating water’s flow rate into account. It should be able to handle the flow rate of the cooling tower system, and the filter’s size and capacity should be chosen accordingly.

● Water Quality

The quality of water will influence the kind of filter used. For example, if the water contains high levels of suspended solids, a filter with a higher dirt-holding capacity will be needed. If the water contains a high level of dissolved minerals, a filter with a higher chemical resistance will be needed.

● Particle Size

The side stream filter should be able to remove particles of the appropriate size. A filter with a smaller pore size will remove smaller particles, while a filter with a larger pore size will remove larger particles.

● Pressure Drop

The pressure drop across the filter should be considered when selecting a side stream filter. A filter with a lower pressure drop will allow the cooling tower system to operate more efficiently.

Pressure Drop.

● Maintenance and Costs

The cost and ease of maintenance of the side stream filter should also be considered. A filter that requires frequent maintenance or replacement will add to the overall cost of the cooling tower water treatment system.

● Type of Filter

Different types of filters are available, such as cartridge filters, bag filters, and automatic self-cleaning filters. The selection of a filter should be made after careful consideration of the system’s needs and intended use.

Side-stream filtration and cooling tower water treatment are critical to the long-term performance and reliability of industrial cooling systems. By removing contaminants and controlling the growth of microorganisms, these systems can prevent corrosion and scaling, which can lead to costly equipment damage. If you are in the market for pristine cooling tower water treatment equipment such as side-stream filters, give NEWater a call.

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