For the mud cake has a sandwich, high moisture content of the problem, the following is a detailed analysis of its causes and solutions:
Reasons and solutions for filling mud cake
Cause
Uneven pressure in the filter chamber:
In the filtration process of the plate and frame filter press, because the forming of the filter cake is a process of continuous accumulation and compression, the thickness of the filter cake at different positions at different times is different, resulting in uneven internal pressure distribution.
The elastic deformation of the filter cloth and the deformation of the cake plane will also exacerbate the uneven pressure distribution, resulting in the formation of the sandwich.
Improper operation:
The technical level and operating procedures of the operator will also have a certain impact on the filtration effect, such as uneven feed and insufficient compression force.
Solution
Optimize the operation process:
Filter press operation is carried out in strict accordance with the operating procedures to ensure uniform feed and appropriate compression force.
In the filtration process, closely monitor the operating state of the filter press and the forming of the filter cake, and adjust the operating parameters in time.
Improved equipment design:
Consider improving the design of the plate and frame filter press, such as optimizing the structure of the filter chamber and improving the uniformity of pressure distribution.
Select high-quality filter cloth and filter plate to reduce the impact of elastic deformation and plane deformation on the pressure distribution.
Two, the causes of high moisture content of mud cake and solutions
Cause
Improper sludge conditioning:
The sludge does not add appropriate sludge conditioner or the amount of sludge conditioner is insufficient, resulting in poor dewatering performance of the sludge.
Sludge and sludge conditioner are not fully mixed, stirring is not uniform, affecting the conditioning effect.
Equipment problems:
The filter cloth is damaged or blocked, resulting in excessive moisture in the pressed mud cake.
The pressing force of the filter press is insufficient or the pressure is unstable, which reduces the filtration effect and dehydration effect when the filter is pressed.
Operation problem:
Insufficient or too long filtration time will affect the moisture content of mud cake.
The sludge is not sufficiently pre-treated before filtration, such as dehydration, drying, etc.
Solution
Strengthen sludge conditioning:
Select the appropriate sludge conditioner and dosage according to the nature of the sludge to ensure that the dewatering performance of the sludge is significantly improved.
Strengthen the mixing of sludge and sludge conditioner to ensure adequate contact and reaction.
Check and maintain equipment:
Check the integrity and blockage of the filter cloth regularly, and replace or clean it in time.
Adjust the pressing force of the filter press to ensure that the pressure is stable and appropriate.
Carry out regular maintenance and maintenance of the filter press to ensure that the equipment is in good working condition.
Optimize the operation process:
Ensure that the filtration time is appropriate, neither too short nor too long.
Sufficient pretreatment of the sludge before filtration, such as dehydration, drying, etc., to reduce the moisture content of the sludge.
Use of auxiliary means:
In the filtration process, you can consider using auxiliary means such as backblowing to help further squeeze out the water in the filter cake.
In summary, to solve the problem of filling mud cake and high moisture content, it is necessary to start from many aspects, including optimizing the operation process, improving the equipment design, strengthening the sludge conditioning, checking and maintaining the equipment and using auxiliary means. Through comprehensive consideration and optimization of these factors, the filter press effect and sludge dewatering performance of plate and frame filter press can be significantly improved.