Grit Classifier

Grit classifier is a grit removal, conveying and dewatering device. It is used to separate sand, gravel and fine solid particles in water and is very helpful in wastewater treatment. The structure used in the design and construction of the gravel classifier allows the unit to remove up to 95% of the sand from the water.

The unit is made of 304 or 316 stainless steel. It is robust, compact and fully enclosed to minimize maintenance and simplify installation.

Working principle of grit classifier

  1. After the gravel separator starts working, the pump will extract clean water and pour the clean water into the mixer truck. After cleaning, the remaining sewage residue will be poured into the car wash drainage tank, which will then pass through another pump with different functions, which can form a high-speed flow of sewage, thus rushing into the gravel separator. Sand and gravel as well as some mixing waste can be separated from the sewage by the sand and gravel separator at this time, these separated sand and gravel can be used twice and become the original material quantity of the mixing concrete sand and gravel separator again, thus saving resources and also protecting the natural environment.
  2. The stirrer of the mixing tank has been rotating periodically, which can keep the water quality not too thick or too thin; the sewage is diluted by injecting water, which can be pumped directly to the mixing host through the mud and sand type water pump and recovery metering fittings to become the material for mixing concrete.
  3. The sand separator is connected to the clear water reservoir, which is flushed with clear water after each separation of sewage to keep the interior clean;
  4. Through the guidance and transformation of the drainage ditch in the whole mixing plant, the other sewage from the whole site can be gathered in the next sedimentation pond through the drainage ditch, and the water in the pond can be pumped back into the above water circulation system for reuse; and the water in the clarification pond can be extracted for various purposes such as washing the exterior of the car or ground washing, and the resulting sewage is returned to the sedimentation pond through the drainage ditch and reused.


  • Temperature, moisture and impact resistance
  • Simple operation
  • Reduced energy consumption
  • Low installation, maintenance and repair costs
  • Ability to design and produce gravel classifiers of different sizes and capacities


The presence of solids and fine particles (such as sand) in water is one of the biggest limitations of various industrial equipment and can cause severe damage to its components. Therefore, solids removal for many applications is accomplished by a variety of methods such as grit classifiers.

  • Grit removal in drinking water treatment
  • Removal of fine particles from water in the wastewater pre-treatment stage to prevent damage to pumps and other components
  • Prevention of salt deposits and pipe clogging
  • Improving the efficiency of clarifiers and aeration equipment

KUOSI, the manufacturer of grit classifiers for wastewater treatment, will provide you with all the information you need to know about grit classifier design points, working principles and prices.

Pictures of grit classifier factory


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