Application of plastic pall ring in Aeration Towers and Air Stripping Towers
Plastic pall ring can be used in aeration towers and air stripping towers, and are a very common and efficient filler choice in both towers.
Here are the reasons why plastic pall ring are suitable for both applications:
1. High specific surface area:
The complex window structure of the pall ring provides a huge specific surface area (usually in the range of 100 - 250 m²/m³).
Aeration tower: The huge specific surface area allows air (oxygen) and water to fully contact, greatly improving the mass transfer efficiency (oxygen transfer rate) of oxygen to water, which is the core goal of the aeration process.
Air stripping tower: Similarly, the huge specific surface area allows the volatile pollutants (such as VOCs, ammonia nitrogen, hydrogen sulfide, etc.) in the water to be fully contacted with the purge air, promoting the transfer (desorption) of pollutants from the liquid phase to the gas phase.
2. Excellent fluid mechanics (low resistance/low pressure drop):
The unique window structure of the ball ring not only increases the surface area, but more importantly, breaks the wall flow effect of the water flow and promotes the redistribution of the liquid. At the same time, the gas channel is unobstructed and the resistance is small.
Aeration tower: Low pressure drop means lower blower energy consumption and more economical operating costs.
Air stripping tower: Low pressure drop also reduces blower energy consumption. More importantly, low pressure drop allows the use of a higher gas-liquid ratio (more air) without flooding, which is crucial to improving stripping efficiency.
3. Good liquid distribution and wetting performance:
The window structure helps the liquid to be redistributed multiple times in the packing layer, reducing channel flow and wall flow, so that the packing surface is more fully wetted.
Aeration tower & air stripping tower: Good wetting is the basis for ensuring effective mass transfer (oxygen transfer or pollutant desorption). The surface area of the packing that is not wetted by the liquid is ineffective.
4. High porosity:
Packing media pall ring have a high porosity (usually 0.9 - 0.95 m³/m³).
Aeration towers & air stripping towers: High porosity provides ample space for gas to pass through, reduces the risk of clogging, and allows the treatment of water bodies with a certain amount of suspended matter (although the suspended matter concentration still needs to be controlled). This also means lower pressure drop.
5. Material advantages (plastics - PP, PVC, CPVC, etc.):
Lightweight: Easy to install and maintain.
Corrosion resistance: Good corrosion resistance for most water treatment environments (such as municipal sewage, general industrial wastewater). Choosing the right plastic material (such as CPVC for higher temperatures or specific chemical environments) can meet specific needs.
Economical: plastic pall ring are generally less expensive than metal or ceramic fillers.
Improved hydrophilicity: Many pp pall ring used in water treatment will undergo surface modification (such as hydrophilization) to improve their ability to be wetted by water, which is very important for improving mass transfer efficiency.
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- Suspended solids control: Although the porosity is high, the concentration of suspended solids (SS) in the inlet water of the aeration tower and the stripping tower still needs to be controlled within a certain range, otherwise long-term operation may still cause the packing to be blocked. Usually, a filter device needs to be installed in front of the tower.
- Scaling/biofilm: In certain water qualities (such as high hardness water, water rich in microorganisms), the surface of the packing may scale or breed biofilm, affecting efficiency, and regular maintenance and cleaning are required.
- Material selection: Select appropriate plastic materials (such as PP for general use, PVC for acid resistance, and CPVC for better temperature and corrosion resistance) according to the temperature, pH value, and chemical substances (such as oxidants and solvents) of the treated water.
- Hydrophilicity: Ensure that the selected plastic pall ring is hydrophilic to obtain the best wetting performance and mass transfer efficiency.
- Tower design: The packing method (random stacking), the design of the liquid distributor, the design of the support grid, etc. all require professional design to give full play to the performance of the plastic pall ring packing.
