What are the main types of equipment covered by this code?

The code covers manually and mechanically cleaned grit channels, bucket-type grit elevators, reciprocating-rake type grit washers, and aerated grit chambers.

What is the recommended horizontal flow velocity in a grit channel?

A velocity between 0.15 and 0.3 m/s is recommended to allow heavy inorganic grit to settle while keeping lighter organic solids in suspension (Clause 4.1.1).

What materials are specified for the equipment?

The code specifies materials such as cast iron (conforming to IS 210), mild steel (conforming to IS 226, now IS 2062), and requires suitable protective coatings against corrosion (Clause 3).

IS 6279

: 1971

equipment for grit removal devices

CurrentSpecializedSpecificationBIMWater Resources · Public Health Engineering

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This standard specifies the requirements for materials, construction, and performance of equipment used for removing grit from sewage and wastewater. It covers equipment like manually and mechanically cleaned grit channels, grit elevators, grit washers, and aerated grit chambers for use in treatment plants.

equipment for grit removal devices

Quick Reference Values

Design horizontal velocity for grit channels0.15 to 0.3 m/s

Minimum detention time in grit chambers20 seconds

Recommended detention time in grit chambers30 to 60 seconds

Minimum air supply for aerated grit chambers0.2 to 0.5 m³/min per metre of tank length

Grit chamber depth to width ratio1:1 to 5:1

Minimum freeboard for grit channels225 mm

Practical Notes

Though published in 1971, this code was reaffirmed in 2017, making it relevant for basic specifications. However, it's recommended to consult modern manufacturer specifications for advanced and automated grit removal systems.

The referenced material code IS 226 for mild steel has been superseded by IS 2062.

Proper anti-corrosion painting and coating as per Clause 8 is critical for the longevity of this equipment due to the highly corrosive environment.