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Comparing Design Parameters

It is important to note that there is a difference in application rate (flow rate/coverage area, expressed in gpm/ft2)

between tube settlers and plate settlers as a result of different effective settling area terms used, despite settling

principles being similar for the two technologies. To provide a more direct comparison, the application rates of tube

settlers can be converted to an equivalent “plate” application rate by taking into account the projected surface area of

tubes:

As illustrated in the above table, the equivalent maximum “plate” application rates of Brentwood tube settlers are in

the same range as a generic plate settler, which has an average application rate of 0.30. IFR6041 tube settlers are the most

comparable to plate settlers in regard to coverage area because settler length is similar. However, Brentwood’s other tube

settler modules are capable of treating required flow just as effectively with appropriate coverage area. Tube settlers also

eliminate cross-flow and eddy currents, which makes flow hydraulics more stable and efficient.

In addition to varying design approaches, there are other advantages and disadvantages to consider when comparing tube

settlers or plate settlers for your application:

Tube Settlers

Advantages:

• Lightweight PVC results in easy installation and does not require heavy lifting equipment

• Lower capital cost due to materials of construction

• Applicable in shallow tanks with underflow velocity concerns

• Twenty to twenty-five year service life, provided proper maintenance is performed

• Only PVC tube settlers are replaced at the end of their useful life typically supporting structures and effluent

  troughs can remain

• Tube settlers are strong enough to walk on top of for proper maintenance

• Highly customizable to accommodate varying basin configurations

Disadvantages:

• Maximum module vertical height is 41 inches, resulting in a maximum application rate of 3.5 gpm/ft2

• PVC must be protected from extensive UV exposure. Brentwood tube settlers do contain UV inhibitors. AccuGrid

  protective surface grating is also available for additional UV protection.

Plate Settlers

Advantages:

• Less limitation on depth

• Longer lifespan due to material of construction

Disadvantages:

• Two to three times higher capital cost

• Higher installation cost due to required heavy lifting equipment

• Deeper basin requirements to accommodate underflow velocities

• Risk of corrosion in certain environments (certain industrial wastewater applications)

Polyhedral Hollow Ball packing is made from heat resistant and chemical corrosion resistant plastics, and the application

temperature in media ranges from 60 to 150 degrees.

Plastic Polyhedral Hollow Ball (PP, PE,

PVC, CPVC, RPP ) is also called plastic multi-aspect hollow ball, polyhedral hollow ball packing composed of two hemispheres

which will form into a ball. And each hemisphere consists of a number of half fan-shaped leaves, the upper and lower leaves

in a staggered arrangement. The design concept is advanced and the structure is reasonable. Plastic Polyhedral hollow balls

have the virtue of light weight, wide free space, small wind resistance, and good surface hydrophilic, big full wet surface

area and convenient filling in the equipment and sound usage effect.

Plastic polyhedral Hollow Ball can be used in sewage treatment, desulfurization of CO2 in power plant, desulfuration and

purified water tower packing. Plastic multi-aspect hollow ball is a new type of high-efficiency tower packing applied in

water treatment equipment.

Pall rings: made in various materials, used in massive applications

Pall rings are the most frequently used form of random packaging. They are made of metal and plastic. They also have

different applications. Our experts will give you the most beneficial info about pall rings through this blog at Linquip. To

find more, read on.

What are Pall Rings?

As said above, pall Rings are a random ring-type packaging with a well-established success background and a globally

distributed base. They try to increase the use of packaging by disrupting the flow by providing an increased number of edges

while reducing the volume of the ring packing medium itself. Pall rings have identical cylindrical dimensions but have

window rows that improve the surface area size. They are ideal for low-pressure drops and applications with high power. They

have randomness and relatively high liquid retention that promotes high absorption, especially if the reaction rate is slow.

Pall rings’ cross structure makes them mechanically robust and ideal for deeply packed beds.

What are Pall Rings Used for?