Manual Coarse Bar Screens

Manual Coarse Bar Screens are commonly installed upstream of pumps in small wastewater pumping stations and small to medium-sized wastewater treatment plants. Their primary function is to intercept large debris and coarse solids, preventing them from entering pumps and downstream treatment equipment.

Manual screens are also frequently installed as standby screening units in bypass channels. They can be used during sudden increases in wastewater flow, maintenance or inspection of existing mechanical screens, and power outages or other operational interruptions at the treatment plant.

Mojan manufactures manual coarse bar screens for different channel configurations and project requirements, providing a simple, reliable, and cost-effective solution for preliminary wastewater screening.

Applications

Mojan Manual Coarse Bar Screens are suitable for:

• Small wastewater pumping stations
• Small to medium-sized wastewater treatment plants
• Open wastewater channels
• Pump inlet protection
• Bypass and standby screening channels
• Emergency screening applications
• Temporary or maintenance bypass arrangements

Main Components

The main components of a Mojan Manual Coarse Bar Screen include:

Screening Frame

The screen frame is manufactured from structural steel or stainless steel, depending on the project requirements and operating environment.

The frame consists of two vertical and parallel side members installed along the upper edges of the channel walls. The frame provides structural support for the screening bars and allows the screen to be securely positioned within the channel.

Screening Bars

The screening section consists of parallel steel bars or flat bars manufactured from structural steel or stainless steel. The bars are installed at a specified spacing and welded securely to the supporting frame.

The bar spacing can be selected according to the type and size of solids that need to be removed and the requirements of the treatment process.

Installation Angle

Mojan manufactures manual coarse bar screens with installation angles ranging from 45° to 75° relative to the channel floor, according to project requirements and customer specifications.

The appropriate installation angle can be selected based on channel geometry, hydraulic conditions, accessibility, and manual cleaning requirements.

Manual Cleaning Equipment

Mojan manual coarse screens can be supplied with a manual cleaning rake manufactured from structural steel.

The rake is used to manually remove accumulated screenings from the screen surface and transfer the collected material to the designated disposal or collection area.

Optional Screening Collection Equipment

Depending on project requirements, Mojan manual coarse screening systems can optionally be supplied with:

• Screening collection boxes
• Screening discharge and collection arrangements
• Conveyor belts for collected screenings

The selection of collection equipment depends on the screen configuration, wastewater flow, screening volume, available space, and operational requirements.

Customized Design by Mojan

Mojan designs and manufactures manual coarse bar screens according to the specific requirements of each wastewater treatment project.

Key design parameters may include:

• Channel dimensions
• Design wastewater flow rate
• Maximum flow rate
• Required bar spacing
• Screen installation angle
• Material of construction
• Hydraulic conditions
• Corrosion and environmental conditions
• Manual cleaning requirements
• Screening collection and disposal method

This customized approach provides a reliable screening solution for protecting pumps and downstream treatment equipment while maintaining simple operation and easy maintenance.