Environmental Grit Classifiers

Untreated wastewater contains inorganic solids such as sand, ash and gravel which is collectively known as grit. The amount of grit in wastewater depends on if the source is from sanitary or other origins. Grit is extremely abrasive, forms plugs and damages pumps and sedimentation tanks if not removed.

KWS Grit Classifiers consist of a large reservoir hopper with an inclined screw feeder. Wastewater enters the reservoir hopper through a pipe connection. Grit falls out of suspension by gravity and settles to the bottom of the reservoir hopper. The screw feeder rotates very slowly, removes the grit and delivers it to a container or conveyor for disposal. The water discharges over a weir and reenters the wastewater treatment process. In today’s modern water and wastewater treatment plant, grit classifiers are primarily used in the preliminary stages of the wastewater treatment process so downstream equipment is not damaged.

Concentrated grit can also be discharged into KWS Grit Classifiers for separation, washing, and dewatering from grit separators or aerated grit chambers. Wastewater flow velocities are maintained to prevent any suspended organic matter from settling with the grit.