With the help of rotary screens, material separation has become much easier. These rotary screens are wear-resistant and majorly used in wastewater treatment plants. Read this blog to know more about rotary screens.
What is a rotary screen?
The rotary screen is one of the best solutions for treatment in domestic and industrial wastewater. The rotary screen is the most preferred kind of equipment for the mechanical treatment of wastewater. These screens have high efficiency that is completely based on the principle of the screen’s operation that makes it useful by eliminating complex impurities like hair, wool from the drains. The high capacity of the screen and closed design in an enclosure is making this indispensable equipment for both medium and small capacity wastewater treatment plants. Another big reason for using a rotary screen for the new energy-efficient wastewater treatment system is – Flushing water.
What are the major areas of application of rotary screens?
There are varied areas of applications where rotary screens are used. You can have a look at those applications:
a) In the food & processing industry for treating wastewater
b) Treating wastewater that has high solid content like feathers, wool, fiber, films etc.
c) In domestic wastewater treatment plants
d) Ideal in separating different kinds of solids & sludges from the industrial as well as municipal wastewater
e) Rotary screens find their great usage in eliminating extruded pellets from the cooling baths.
f) These screens are efficient in separating debris from various equipment cleaning processes.
Some other industries where the rotary screens are useful are the sugar industry, fruit processing industry, mineral processing, fertiliser processing and many more.
How do rotary screens work?
The rotary screen for wastewater treatment eliminates solids without clogging or blinding the screen. The rotary screen usually contains a horizontal cylinder with a strong wedge wire screening, headbox, support structure, discharge chute and a few other requirements with non-rotating equipment. You can also have an additional variable-speed drive that can permit you to adjust the rotation of the drum’s speed for getting maximum effectiveness of dewatering.
The rotary screens contain a headbox and from that headbox, effluent discharges (solids) & then a small weir gets overflowed and floods the exterior portion of the cylinder’s top at the entire length. When the rotation is taking place, liquid from the waste drains via the slotted apertures in the rotary screen into a baffle that clusters the flow on the interior side just opposite of the cylinder at the lowest point. The solids get removed that can be trapped in those apertures even while handling greasy, resinous or fibrous matters. The deluged solids get collected on the rotary screen’s exterior part before being eliminated through a doctor blade & led through a chute.
What are the benefits of rotary screens?
1) Simple machinery to be relied upon
A rotary screen is a simple machine with a simple working principle and operation. Usually, they are made up of High-Density Polyethene. This mechanism needs almost negligible maintenance. A rotary screen consisting of big trunnions offers support to the drum and gives stability at the time of rotation.
2) Capture Rate is quite high
The drum of the rotary screen is internally fed and it results in the catching of every kind of debris like – grits, rocks, fibers, rags and many other matters. The high capture rate is offered by the screen by the penetrated plate that is small and makes a good solution for screening purposes.
3) Easy and safe access
The hydraulic present in the screen allows one operator to open the cover and a safety switch can stop the drum automatically.
4) Needs less maintenance
The rotary screens require very little maintenance and contain just visual inspection of the drum and its components. The rotary screens for wastewater treatment are very hassle-free to maintain because of their accessibility to the main components at the time of operating conditions. Its simple design structure facilitates the installation process and operation of the tool. The work of this rotary screen is automated and terminates the requirement for the continuous presence of maintenance personnel.
5) Extremely durable
If the screen is made up of stainless steel material then that can lessen corrosion and make the equipment quite durable. The stainless steel part mainly undergoes a passivation stage that enhances service life even in aggressive environmental conditions.
Rotary screens in wastewater treatment
The rotary screen is apt for applications that need fine screening. The wastewater treatment plants use the rotary screens as the very first step of their pre-treatment prior to flotation. The screening process is vital in treating wastewater. It offers protection of the downstream process, in short to the complete wastewater treatment plant.
Hope after going through this blog you have come to know much about rotary screens. These screens are one of the best solutions for treating wastewater in industries and several other areas because eliminating solids from the waste streams is vital.
Add Comment