Overview
The back raking bar screen is a specialized mechanical filter designed for wastewater and stormwater treatment applications. Unlike traditional screens, it employs a unique reverse raking mechanism where cleaning teeth move upward against the flow direction to remove trapped debris. This design minimizes re-entry of solids into the water stream, making it particularly effective for high-flow environments like municipal wastewater plants and industrial intake systems. Its automatic operation reduces labor requirements while maintaining consistent filtration performance.
Structure and Working Principle
A typical unit consists of parallel bars forming a screening surface (gap spacing 10–50mm), motor-driven rake teeth, debris conveyor, and control system. The screen is installed at a 60–80° angle to optimize debris capture. During operation, wastewater flows through the stationary bars while the automatic rake system periodically reverses direction to lift accumulated solids upward. Captured debris is then discharged into a collection bin or conveyor. Modern versions incorporate PLC controls with level sensors or timers to optimize cleaning cycles based on debris load.
Key Features
Reverse raking action provides superior cleaning efficiency (typically 90–95% solids removal) compared to conventional screens by preventing debris from slipping back into the flow. Stainless steel construction ensures durability in corrosive environments. Advanced models feature self-cleaning mechanisms, overload protection, and integration with SCADA systems. The modular design allows customization for different channel widths (commonly 0.5–3m) and flow capacities (up to 50,000 m³/day). Some units include spray washing systems to prevent material buildup on rake teeth.
Application Areas
Primary applications include municipal wastewater treatment plants (installed at headworks), stormwater management systems (as 'rainwater screens'), and industrial water intake facilities for food processing, pulp/paper, and power generation. In combined sewer systems, these screens effectively handle sudden influxes of debris during heavy rainfall. They're also deployed in coastal areas for marine debris filtration and agricultural runoff management. The robust design makes them suitable for high-solid loads in mining and slaughterhouse wastewater applications.
Maintenance and Precautions
Monthly inspections should check for worn rake teeth (replace if >3mm wear), chain tension, and bearing lubrication. Annual maintenance typically involves complete drive system overhaul and corrosion assessment. Operators should monitor for unusual vibrations or noise indicating mechanical issues. In cold climates, heating elements or frequent cycling prevents ice formation. Always isolate power before servicing. For stormwater applications, post-rain inspections are recommended to clear any accumulated vegetation or plastic waste.
B2B Procurement Guide
When sourcing, specify flow rate (peak and average), channel dimensions, required gap spacing (standard is 20mm for municipal wastewater), and material grade (SS316 for saline environments). Automation level (manual/semi-auto/full-auto) affects pricing. Leading manufacturers are typically European (e.g., Huber, Parkson) or Chinese (e.g., Jiangsu YLD, Zhejiang Zhengda). Request FAT (Factory Acceptance Testing) for large orders. Consider lifecycle costs—high-end stainless steel models may have 20+ year service life versus 8–12 years for coated carbon steel. Spare parts availability should be verified, especially for proprietary components.
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