Head Office: Tehran, Shariati, Taleghani Street, 1 Amol, No. 75, V.25

02177638731 – 02177638732



Clarifier is one of the most important equipments in the field of wastewater treatment, the main purpose of which is to remove suspended solids with a size higher than 10 microns. The specifications used in the design of clarifiers are different according to their installation location, and based on this, the design and production of clarifiers is done. Haft Industrial Group; The manufacturer of clarifiers in different dimensions and sizes, will provide a comprehensive guide on how the clarifier works, how to make a clarifier and everything you need to know about this equipment.

What is a clarifier?

A clarifier is a device that produces clear water at the outlet of water after the addition of organic and suspended chemicals. In other words, in this group of water treatment equipment, suspended solids with a diameter of more than 10 microns are separated from the water due to chemical reaction of water with coagulants and they settle in the form of coagulated sludge in the pool floor and treatment ponds. Due to the fact that the quality of the water coming out of the clarifier device is greatly increased and the water becomes more transparent, this equipment is called clarifier.

How Clarifier works

In addition to the coagulants, the Clarifier requires special agitators to coagulate organic matter and settle it in the bottom of the water, so that the mixing and coagulation process can take place properly. In general, it can be said that the operation of the Clarifier includes the following:

·        Combination of water and special chemicals for clotting organic matter with high speed agitators

·        The material in the water coagulates at a slow stirring speed

·        Shutting off the stirrers and allowing the coagulated material to settle to the bottom of the pond or pool

Types of clarifiers

Wastewater clarifier can be classified based on various features, the most important of which is the overall shape of the device. In this category, they can be divided into two general groups, circular and rectangular clarifiers. Each of these two groups has special features that are:

Circular clarifier

As is clear from the name of this group of clarifiers, the shape of the device is circular. Due to the general structure considered in the design of the circular clarifier, a larger ground with a minimum diameter of 3 meters is required to install this equipment. One of the most important applications of circular clarifiers is large wastewater treatment plants, which can be easily installed sludge remover to easily drain the coagulated material in the pool floor. The sludge is collected and discharged in the circular type of clarifiers in such a way that it is placed in the bottom of the machine by the sludge removal devices in the well and finally discharged.

Rectangular clarifier

Another type of clarifier used in small treatment plants is the rectangular clarifier. One of the most important features of this device is its lower manufacturing cost if you need several clarifiers in one treatment plant. The reason for this reduction in the cost of making a rectangular clarifier is the use of a common wall between the two sources and the pond. The sludge collection system in this type of clarifier is such that the material accumulated in the floor is transferred to the beginning of the pool and finally discharged.

Based on other factors such as how the clarifier works, they can be divided into other groups, which are:

Single-pass clarifier

One-pass clarifiers are clarifiers that are produced horizontally and consist of a total of three room-like sections. The way this type of clarifier works is that in the first room, the coagulant chemicals are mixed with water in a hot mixer and then they enter the next room. In the second room, with a slower speed, it provided the conditions for the clot and sludge to settle in the water, and in the third room, the sedimentary material from the bottom of the pool is drained and clear water is used.

Up-flow clarifier

Unlike single flow clarifiers, in the up-flow type, the process of flocculation of organic matter in water does not take place in separate environments. This type of wastewater treatment clarifier generally consists of a single-part device that first combines chemicals with a high agitator in water, then reduces the agitator speed and the coagulated material has the opportunity to separate from the water, and finally, in the pool floor or Sewage treatment ponds settle. The clear water produced from the overflow section of the device is used. This group of clarifiers are also divided into two general categories covered with sludge and solid collisions.

Clarifier design

In designing a clarifier, several important factors must be considered in order to receive a good output from the device. One of the most important factors is the surface load, which is actually the amount of water passing through the surface per unit time. The higher the velocity or amount of water passing through the surface per unit time, the less coagulated materials will undoubtedly have a lower chance of settling, which will ultimately reduce the efficiency of the device.

Another very important consideration in clarifier design is the depth of the device. If a little depth is taken into account during the design of the clarifier, the coagulated material will re-enter the water and the quality and clarity of the water will be greatly reduced. Of course, if the depth of the device is considered higher than the standard, it will also have a negative impact on the efficiency of the device. Deep clarifiers will take longer to settle the coagulated material in the water, which can be a problem for large treatment plants.

Production and manufacture of clarifiers

Haft Industrial Group; It is one of the largest manufacturers of water and wastewater treatment equipment and there is a great variety in their products. The design, production and construction of clarifiers in this complex are done under the supervision of professional and experienced engineers and are done according to international standards. Variety and high quality in making clarifiers with reasonable prices are the most important features of the products produced by this collection. It should be noted that this collection, in addition to the production and manufacture of clarifiers, provides the necessary advice before buying a clarifier.

Clarifier price

The price of clarifier varies according to its general shape (circular or rectangular), the mechanism of coagulation of organic materials, the size of the device, the material of the body and the connections and equipment in it, and other items. Therefore, for information on the price of clarifier, we suggest that you contact Haft Industrial Group through the communication channels mentioned at the bottom of the page.

Application of clarifier

The purpose of producing clarifier is to purify water and wastewater and make it clear that the output of this process can be used in different environments. Among the applications of Clarifier, the following options can be mentioned:

·        Use of clarifier in municipal water treatment plant

·        Used in industrial purification

·        Application in wastewater pretreatment

·        Concentration of minerals

·        Application of Clarifier in sugar cane factories

Leave a Reply

Your email address will not be published. Required fields are marked *

Abous Us

Asayesh Afza Imen Company started its activity in the 70s with the aim of providing engineering consulting services in the construction and operation of water and wastewater treatment systems. This group operates by taking possession of the world’s technical knowledge and relying on new engineering technologies in the field of design, construction, installation and commissioning of water (industrial, domestic, swimming pool) and sewage systems.

Our License

© All rights are reserved for Asayesh Afza Imen Company.

Design: Mahyan