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Mechanical Dewatering

Mechanical dewatering is a crucial process in various industries, from wastewater treatment, maure processing to the food & beverage industry. It plays a pivotal role in separating solids from liquids efficiently. Tianzhong Machinery, a trusted supplier, offers state-of-the-art screw press dewatering machines designed to meet diverse mechanical dewatering needs. In this post, we’ll delve into the world of mechanical dewatering, covering what it is, its different types, and its applications.

What is Mechanical Dewatering?

Mechanical dewatering is a method that employs mechanical forces, such as pressure or centrifugation, to separate water from solids. It’s an essential process in industries where the efficient removal of moisture or liquid content is crucial.

Screw Press Juice Extractor
Screw Press Dewatering
Feeding Hopper
Feeding Hopper of Screw Press

Types of Mechanical Dewatering Equipment

There are several methods and equipment used in mechanical dewatering, depending on the specific application and the characteristics of the material being dewatered. Here are some common types of mechanical dewatering equipment:

1. Screw Press Dewatering

Screw press machine uses a rotating screw to convey and compress the material, forcing the liquid to separate from the solids. The liquid filters out through the screen and the dewatered material is then discharged at the end of the screw. They are widely used in wastewater treatment, food processing, and agricultural applications.

2. Centrifuge

Decanter centrifuges use centrifugal force to separate solids from liquids. Due to the high-speed rotation of the rotor, solid particles with higher density settle towards the inner wall of the drum and are then discharged at the conical end of the drum, while the liquid is discharged from the larger end of the drum. This machine is mainly used to process sludge, municipal and industrial wastewater.

Screw Dewatering Process
Screw Dewatering Process
Decanter Centrifuge Workflow
Decanter Centrifuge Workflow

3. Belt Press

A belt press is a type of equipment used for the dewatering of sludge. The sludge is fed onto the belt filter. Some water drains out due to gravity as the sludge moves along the belt. Then the pressure between the two belts will further remove water from the sludge. After belt pressing, the sludge passes through a series of rollers that further compress it, expelling more water.

4. Filter Press

A filter press consists of plates and frames, with filter cloths covering both sides of the plates. These plates and frames are tightly pressed together using a compression device. Under pressure, the filtrate passes through the filter cloths, leaving behind dewatered solid cake. This machine is widely used to dewater chemical slurry and sludge in wastewater treatment.

There are also some mechanical dewatering methods, such as gravity thickeners, rotary drum vacuum filters, etc. The choice of mechanical dewatering equipment depends on factors like the type of material being processed, the desired level of dewatering, the processing capacity, etc. Each type of equipment has its advantages and limitations, so selecting the right one is essential for achieving efficient dewatering results. Tianzhong Machinery is a professional supplier of dewatering machines. Welcome to talk with us for more details!

Mechanical Dewatering -Belt Press
Belt Press
Mechanical Dewatering Filter Press
Filter Press

Applications of Mechanical Dewatering

Mechanical dewatering is widely employed in various industries and applications. Below are some common applications:

1. Wastewater Treatment — Sludge Dewatering

In municipal and industrial wastewater treatment plants, mechanical dewatering equipment such as belt filter presses, centrifuges, and screw presses are used to remove water from sludge, reducing its volume and weight for disposal or further processing. Among them, screw press machine offers continuous operation and low energy consumption, but limited processing capacity. While filter press is more suitable for larger-scale dewatering operations.

2. Food Processing and Beverage Industry

Machines like screw presses and filter presses are used to extract juice or oils from fruits and vegetables. They are also used to process waste fruits and vegetables, spent grains from distilleries or breweries, etc.

3. Manure Dewatering

Mechanical dewatering equipment, such as screw press manure separator, can be used to separate liquid and solid from animal manure, such as cow, pig, or poultry manure. By removing excess moisture, the dewatered solids are easier to handle, transport, and can be used as fertilizer. The separated liquid can be used for irrigation or further treatment.

4. Agricultural Wastes

In agricultural industry, dewatering machine is also used to process various agricultural residues and organic waste, such as crop stalk, grape pomace, wheat straw, grass, etc.

5. Chemical Industry

Mechanical dewatering is used to separate solids from chemical slurries, such as paper pulp dewatering, textile industry, waste plastic, facilitating the recovery of valuable products and the disposal of waste.


In conclusion, mechanical dewatering is versatile among a wide range of applications across diverse industries. By separating solids from liquids, this process can reduce waste volume and weight, thereby reducing the related costs of storage, transportation, and further processing. Among these different mechanical dewatering methods, you need to consider factors such as the type of material, desired level of dewatering, and processing capacity, to choose a suitable machine for your project.

At Tianzhong Machinery, we design, manufacture and provide screw press dewatering machines tailored to your specific needs. If you have any questions about mechanical dewatering, please don’t hesitate to get in touch with us. We will assist you in making informed decisions for your operations.