Abattoir Practices and Animal Products Technology

DRAINAGE

• The floors in wet areas should slope uniformly to drains with a gradient of 1:50. One drain is for each 40 m² of floor area. The internal drainage should be in the form of open concrete channels leading to open gullies, situated immediately outside and connected to closed drains.
• Low places where water and blood could collect are to be guarded against. Where blood tends to collect, e.g. under dressing rails, special provision must be made to supply drainage valleys at a gradient of at least 1:25. The valleys themselves should be 60 cm wide and should continue under dressing lines for the collection of all blood and bone dust.
• Catch Basins - Catch basins must be provided on drains for grease recovery.
• Traps and Vents - Traps and vents must also be provided on drains, properly sealed and easily cleanable and the latter to be effectively vented to outside the building.
• Special arrangements have to be made for dealing with stomach and intestinal contents, the drains for bovine material to be at least 20 cm in diameter and for the smaller species 15 cm.
• All drains in the slaughter hall be trapped with 4 mm screens, to prevent the possibility of contamination of the effluent.
• Grids covering drains should be made of cast iron or other approved material.