High moisture content of mud cake is a common problem, in order to reduce the moisture content of mud cake, the following methods can be taken:

First, optimize the filtration process

Increase press pressure:

Increasing the press pressure can make the water in the cake more effectively squeezed out, thereby reducing the water content. The moisture content of the mud cake can be reduced to about 60% by diaphragm pressing and other technologies.

Secondary press process:

After the first press, the filter cake is pressed twice, which can further reduce the water content. This process is particularly suitable for occasions where a high degree of dehydration is required.

Optimized filtering conditions:

Adjusting parameters such as filtration speed, filtration pressure and belt speed can improve the filtration effect and help reduce the moisture content of mud cake.

Two, improve sludge conditioning

Add sludge dehydrating agent:

The use of sludge dehydrating agents such as polymer can effectively combine with the water in the sludge to form flocs that are easy to separate, thereby reducing the moisture content of the mud cake. Common sludge dehydrants include polyacrylamide (PAM) and so on.

Pretreatment sludge:

Before the sludge enters the filter press, adequate pretreatment, such as dehydration, drying and curing steps, to reduce the free water content in the sludge and improve the dewatering performance of the sludge.

3. Check and maintain equipment

Replace or clean filter cloth:

Aging, clogging or damage to the filter cloth will lead to a decrease in the dewatering effect and increase the moisture content of the mud cake. Therefore, the status of the filter cloth should be checked regularly, and the filter cloth should be replaced or cleaned in time.

Inspection and maintenance of discharge systems:

Ensure that the discharge system is unimpeded, and timely clean up impurities and blockages in the system to ensure that excess water is discharged.

IV. Using other technologies

Air blowing method:

In the filter press process, after stopping the feed, the filter cake is twice squeezed and dried by high pressure air to further reduce the moisture content of the mud cake. This method can reduce the moisture content of the mud cake to about 20%.

Sludge drying incineration process:

For some sludge with high calorific value and low moisture content, dry incineration process can be used for treatment. The dried sludge incineration can maintain its own combustion without adding auxiliary fuel, while reducing the risk of secondary pollution.

5. Strengthen operation management and training

Develop operating specifications:

Formulate detailed operation specifications and processes to ensure that operators can operate in accordance with the specifications and avoid the increase of mud cake moisture content due to improper operation.

Strengthen personnel training:

Conduct professional training for operators, improve their familiarity with sludge dewatering process and equipment operation process, and improve operational proficiency and accuracy.

In summary, reducing the water content of mud cake needs to start from many aspects, including optimizing the filtration process, improving sludge conditioning, checking and maintaining equipment, adopting other technologies, and strengthening operational management and training. Through the comprehensive application of these methods, the moisture content of mud cake can be effectively reduced, and the efficiency and quality of sludge dewatering can be improved.