In a sewage treatment plant, a bar screen is a type of mechanical equipment that is used to remove large objects from wastewater before it is treated. The purpose of the bar screen is to protect downstream equipment, such as pumps and membranes, from damage that can be caused by large objects in the wastewater.
In this blog, we will explore what bar screens are, how to select different types and features, and the differences between mechanical and manual bar screens.
What is Bar screen in sewage treatment plant?
A bar screen is a mechanical device that consists of a series of parallel bars that are spaced a certain distance apart. The wastewater flows through the bars, and any large objects that are too big to pass through the gaps between the bars are caught and removed from the water. The removed objects are usually collected in a bin or conveyor for disposal.
Types of Bar Screens
There are several types of bar screens that can be used in a sewage treatment plant, including:
- Fixed Bar Screen - This type of bar screen has stationary bars that do not move. The wastewater flows through the bars, and any large objects that are caught are manually removed from the screen.
- Trash Rake Screen - This type of bar screen uses a mechanical rake to remove the large objects that are caught in the screen. The rake moves up and down along the bars, collecting the debris and depositing it in a bin or conveyor for disposal.
- Step Screen - This type of bar screen has bars that are angled at a certain degree to create a step-like pattern. The wastewater flows over the steps, and any large objects that are caught are removed by a mechanical rake.
- Drum Screen - This type of bar screen has a rotating drum that is covered in bars. The wastewater flows through the drum, and any large objects that are caught are removed by a mechanical rake.
Features of Bar Screens
When selecting a bar screen for a sewage treatment plant, there are several features that should be considered, including:
- Bar Spacing - The spacing between the bars determines the size of the objects that can pass through the screen. The bar spacing should be selected based on the size of the objects that are expected to be in the wastewater.
- Material - The material used for the bars should be selected based on the type of wastewater being treated. For example, stainless steel bars may be used for wastewater that is high in corrosive chemicals.
- Maintenance - The bar screen should be easy to maintain and clean. This is important to ensure that the screen continues to function properly and does not become clogged with debris.
Mechanical Screens vs. Manual Bar Screens
Manual bar screens are operated manually and require human intervention to remove the debris that is caught on the screen. Mechanical screens, on the other hand, are automated and use mechanical equipment to remove the debris. Mechanical screens are preferred in most cases because they are more efficient and require less maintenance than manual bar screens. They can also be equipped with sensors and alarms that alert operators if the screen becomes clogged or malfunctions.
Conclusion
In conclusion, a bar screen is an important piece of equipment in a sewage treatment plant that is used to remove large objects from wastewater before it is treated. There are several types of bar screens and features that should be considered when selecting a screen for a specific application. Mechanical screens are generally preferred over manual bar screens because they are more efficient and require less maintenance.
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