For the problems of high moisture content and sticky filter cloth of plate and frame sludge decentant cake, the following are some possible causes and corresponding solutions:

 

Cause analysis

 

Sludge properties:

 

The sludge contains a certain proportion of impurities, such as soil, slag, etc., which will increase the moisture content of the sludge.

 

The sludge contains metal ions, sulfides, oxides, etc., which may also lead to an increase in the water content of the mud cake.

 

The viscosity of the sludge is high and it is easy to adhere to the filter cloth.

 

Operating parameters:

 

Improper setting of the operating parameters of the filter press, such as feed pressure, filter pressure, press pressure, etc., is too high or too low, which may affect the moisture content of the mud cake.

 

Improper selection of filtration speed and press time may also lead to excessive mud cake moisture content.

 

Filter cloth performance:

 

Improper selection of filter cloth material and specifications may lead to insufficient retention ability and wear resistance, thus affecting the filtration effect.

 

The filter cloth is not cleaned in time or is not cleaned thoroughly, which may lead to blockage and affect the dehydration effect.

 

Equipment Maintenance:

 

Improper maintenance of filter press equipment, such as the filter plate, filter frame and other components wear seriously, may lead to leakage phenomenon, affecting the dehydration effect.

 

Inaccurate equipment debugging and calibration may also cause operating parameters to deviate from optimal values.

 

Solution

 

Optimization of sludge treatment:

 

Pre-treatment before the sludge enters the filter press, such as adding filter aid, diluting the sludge, etc., to improve the filtration performance of the sludge.

 

Select the appropriate filter aid and dosage according to the nature of the sludge to reduce the viscosity and water content of the sludge.

 

Adjust operating parameters:

 

Check and adjust the operating parameters of the filter press to ensure that the feed pressure, filter pressure, press pressure, etc., are set within a reasonable range.

 

Select the appropriate filtration speed and press time according to the nature of the material to ensure the dryness of the mud cake.

 

Improved filter cloth performance:

 

Select filter cloth materials and specifications suitable for sludge properties to improve the interception ability and wear resistance of filter cloth.

 

Regularly clean and replace the filter cloth to maintain its good permeability and filtration performance.

 

Strengthen equipment maintenance:

 

Regular maintenance and maintenance of the filter press, check and replace badly worn parts, such as filter plates, filter frames, etc.

 

Keep the sealing performance of the equipment good to prevent leakage.

 

Regularly debug and calibrate the equipment to ensure the accuracy of all parameters.

 

Other auxiliary measures:

 

Drying technology such as hot air or microwave can be introduced during the pressing process to further reduce the moisture content of the mud cake.

 

Consider the use of plate and frame filter press in combination with other dehydration methods, such as centrifugal dehydration, belt filtration, etc., in order to play their respective advantages and improve the overall dehydration effect.

 

In summary, in view of the problems of high moisture content of the plate and frame sludge descementing cake and sticky filter cloth, the problems can be solved from the aspects of optimizing sludge treatment, adjusting operating parameters, improving the performance of filter cloth, strengthening equipment maintenance and taking other auxiliary measures.