What is a clarifier?

Clarifiers are one of the types of sedimentation ponds that continuously remove the sedimented materials using mechanical tools.

Clarifier is generally used to remove solid particles or suspended solids from a liquid with the purpose of clarifying it.

The difference between clarifier and thickener

The difference between clarifiers And Tickner is very subtle because they look the same. Both thickeners and clarifiers are used to settle solids, which leads to the separation of liquids and solids. The difference comes from the fact that thickeners are used to thicken solids, while clarifiers are used to purify liquids.

Application of clarifier

Beverage purification

Performing the coagulation and flocculation processes make suspended fine particles stick together and form larger and denser particles that settle more quickly and stably. Coagulation and flocculation allows the separation of particles in the clarifier with greater efficiency and ease, which helps to save energy. Separation of particle components using these processes can reduce the volume of downstream water treatment processes such as filtration. Sedimentation in drinking water treatment is generally a stage of chemical coagulation and flocculation, which allows the particles to be grouped together in larger clots. This increases the sedimentation rate of suspended solids and allows the sedimentation of colloids. Polyelectrolytes and ferric sulfate cause the accumulation of fine particles suspended in water. Before entering the clarifier, the water may be treated with these coagulant chemicals. After coagulation, the coagulated particles form denser particles that settle easily. Then the water is sent to the clarifier, where the clear water is separated from the clot. Then the particles form a layer of sludge that needs regular disposal. After that, the purified water can be passed through granular filters to remove the remaining particles in the water. Then the filtered water flows to a pumping station for storage and use.

Wastewater treatment

Sedimentation tanks have been used for sewage treatment for thousands of years. Primary wastewater treatment is done by removing floating solids and settling solids. The final sedimentation tanks, which are called secondary clarifiers, are used to remove the sludge obtained in the process and final clarification.

Application in mining

The methods used for the purification of suspended solids in mine wastewater include sedimentation and clarification of sludge and filtration. After the ore is dissolved, the saturated solution is pumped into a large sedimentation tank and the rock and clay are settled at the bottom.


Types of clarifiers

Clarifiers are generally divided based on their appearance, but in the meantime, there are other different divisions based on the performance of the clarifier device. Among the known types, two groups can be mentioned: round, rectangular, single pass and upward direction.

Circular clarifier

Circular clarifier or circular clarifier is one type of clarifier It is installed in a land with a minimum diameter of 3 meters. Due to the non-angled construction of this model, installation of mud removal or flushing equipment is done easily. The materials settled in the floor and coagulated by coagulants are washed and discharged in the sedimentation basin during the sludge removal operation.

Rectangular clarifier

Rectangular clarifiers or square clarifiers are other types of clarifiers that have many fans due to their structural shape. The construction of this device The clarifier is in the form of a rectangular pond or pool, which has a joint with the pond or source on its side, this is the reason that the cost of making a rectangular clarifier is greatly reduced and the use of this model is economical.

Single pass clarifier

The construction of this type of clarifier It is fundamentally different from the previous two models, the building of this model, which is built horizontally, is divided into 3 parts. The first part in this model is the place where water and chemical coagulants are mixed, which is done by a high speed stirrer.

The second part of the single-pass clarifier includes a chamber where the stirrer moves at a slow speed and provides space for sediments to settle. In the third part, there is an outlet for draining sediments and sludge from the bottom of the pond or pool.

Clarifier above

Upward flow clarifier or upstream clarifier from other types of clarifier devices It has a function similar to the single-pass type, but it is different in terms of structure and network division.Upward flow clarifier or upstream clarifier from other types of clarifier devices This device includes a part where the process of flocculation and coagulation of particles takes place in one room.

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