SCRAPERS

Scrapers used in wastewater treatment plants are mechanical equipment commonly employed in primary and secondary sedimentation tanks to collect sludge that settles at the bottom and materials such as oil and foam that accumulate on the surface. These equipment allow for the removal of settled or floating materials, enabling the water to proceed to further treatment processes.

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Main Types of Scrapers:

  1. Surface Scrapers
    – Duties: Remove oil, foam, and other floating materials from the surface and direct them to special collection chambers.
    – Usage Area: Typically used in primary sedimentation tanks.
  2. Bottom Scrapers
    – Duties: Scrape the sludge accumulated at the bottom of the tank and direct it to the central sludge pit or bottom discharge pipes.
    – Usage Area: Primary and secondary sedimentation tanks.
  3. Circular Tank Scrapers
    – Move from the center to the outer edge of circular tanks or vice versa.
    – Generally operated with a rotating bridge or central rotary drive system.
    – Contain both surface and bottom scrapers simultaneously.
  4. Rectangular Tank Scrapers
    * Operate with chain or paddle systems that move back and forth along the tank.
    * Scraping process is carried out linearly.
    * These systems typically use chain conveyors.
    Importance of Scrapers:
    * The removal of sludge and oil increases the efficiency of biological treatment processes.
    * Prevents accumulation and bad odors in the tanks.
    * Regular removal of sludge helps the system operate smoothly with automation.
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