What Is Mechanical Dewatering?


There are many types of mechanical dewatering, and the best method for your product will depend on the type of material you’re trying to dewater. Some mechanical dewatering methods squeeze and compress the water out of the material. Other forms sling water out using centrifugal action. Read on to learn more about each type. 

Centrifugal thickening

Centrifugal thickening of sludge is a process that utilizes the high-speed rotation of a cylindrical bowl to produce a non-liquid product called cake. This method reduces the volume of solids in wastewater, improves operation, and reduces storage costs. Centrifuges have been used in wastewater treatment since the 1930s. It is a highly efficient means of lowering solids in wastewater.

The primary methods of centrifugal thickening include belt filter presses, centrifuges, and chamber filter presses. These processes are highly complex, sophisticated, and effective at separating sludge into solid and liquid. While the solid and liquid parts are completely separated, they still contain pathogens and pollutants. This makes them an essential step in the dewatering process.

Flotation thickening is also another method of dewatering. This method utilizes gravity to separate solids from liquids. It is similar to mechanical dewatering and is highly effective in reducing sludge volumes. Centrifugal thickening is also beneficial in improving digestion and the destruction of volatiles. This method is a cost-effective solution that reduces capital costs.

Centrifugal screw presses

When it comes to mechanical dewatering, screw presses are a great choice. These machines remove water from sludge and collect the filtrate for further processing. The process continues until the sludge cake is dry and discharged. Centrifugal screw presses can be a valuable asset to the nutrient management program. However, proper maintenance and training are crucial to ensure the system operates properly.

A centrifugal screw press separates liquids from solids, usually through screening. This process is critical to promoting environmental sustainability and helps reduce the volume of waste that goes to landfills. Dewatering is also helpful in the food processing industry, where a large amount of waste food consists of water. As a result, removing moisture from food ingredients is essential before storing and transporting them. Similarly, the pulp and paper industry relies on dewatering to remove liquids from cellulose fiber.


Electro-osmosis for mechanical dewatering uses a process known as electro-osmosis. This process uses an external electric field to move ionized liquid close to particle surfaces. You can use this process to accelerate the consolidation of semi-solid materials. This article discusses some of the critical aspects of electro-osmosis. After learning about this process, you will be ready to use it in your applications.

The basic concept of electro-osmosis for mechanical dewater-ing is simple. It involves treating water and soil. You can apply the process to various types of soil. In some cases, electro-osmosis will improve soil properties. For example, electro-osmosis for mechanical dewatering can enhance the strength of soft clays. Further, electro-osmosis will stabilize and strengthen sensitive soils.

Thermal drying

Thermal drying and mechanical dewatering are two processes used to dry biosolids. Both of these processes can produce dry biosolids cake with minimum cost. These processes also minimize problems, ensuring they are reliable and compatible with the plant environment. 

– The combined use of coal powder can improve sludge dewaterability and briquette calorific value. In experiments, fifty grams of sludge cake was mechanically dewatered with 400 kg/cm2 compression pressure. The water content of the dewatered sludge was 57% at the end of mechanical dewatering. Thermal drying resulted in a briquette with 15% moisture content. The energy required to perform these two processes was 1080 J/g. In contrast, direct thermal drying required 1520 J/g of energy.

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