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EM54 - GRIT AND OIL REMOVAL SCRAPER BRIDGE, AERATED TYPE

Application Grit and oil removal from municipal and industrial waste water.
Characteristics Longitudinal flow channel, with tapered section (downwards). 
The channel is divided into two zones: the grit removal zone (normally aerated) the oil removal zone. The two zones are separated by a longitudinal baffle.
Operation The waste water goes through the grit removal system longitudinally; the grit which sediments on the bottom is scraped and conveyed into a hopper and then lifted by air-lifts or submersible pumps.
The floating substances in the oil removal zone are conveyed to the hopper by a surface scraper.
Materials Compact equipment in hot dip galvanized carbon steel or stainless steel.
Installation In a concrete channel.
Separation Grit particles larger than 200 microns.
Optional
Separation between grit removal-oil removal zones. 
Power supply by cable winding reel. 
Air blowing system.

 

OPERATION DESCRIPTION

The water speed in the grit removal channel is lower than 0.3 m/sec., therefore the grit having a larger size than 200 microns settles on the bottom. The air distributed by the diffusers fluidifies the grit before it sediments and removes the organic substances which deposit on it. These organic substances and the other substances in the water, thanks to the air effect, float and flow together to the oil removal zone which is on the channel side and is not aerated, then they are taken away by a surface scraper. 
The grit settled on the bottom is conveyed to the hopper by the bottom scraper. 
The recommended air delivery is of 10-15 Nm3/h per metre of length of the grit removal channel.

 

MECHANICAL SOLUTIONS FOR THE SCRAPER BRIDGES
  • scraper bridge with concrete runways, equipped with tyred wheels and contrast wheels
  • scraper bridge with rails

 

TECHNICAL DATA
1.1 Max. flow rate in the channel :m³/h (*)
1.2 Width of the grit removal zone :mm. (*)
1.3 Width of the oil removal zone :mm. (*)
1.4 Channel length :mm. (*)
1.5 Aeration zone air flow rate :m³/h  
(*) To be advised when asking for a quotation