For the problems of long mud pressing time, mud cake pressing and high moisture content, the following is a detailed analysis of its possible causes and solutions:

Possible causes

Sludge properties:

The sludge contains more hydrophilic substances or impurities, such as soil, slag, metal ions, etc., which will increase the difficulty of dewatering the sludge.

The particle size of the sludge is fine, and the specific surface area is large, making the water difficult to remove.

Filter press operation:

The pressing pressure is insufficient or the pressing time is too short, resulting in the water in the mud cake can not be fully discharged.

Improper selection of filter cloth or incomplete cleaning, resulting in clogging of filter cloth, affecting the dehydration effect.

The pressing force of the filter press is insufficient or the pressing time is not enough, resulting in a loose seal of the filter chamber and water leakage from the edge of the filter chamber.

Filter press equipment:

There are defects in the filter press equipment itself, such as poor sealing of the filter plate and poor material of the filter cloth.

Filter wear or aging after a long time of use, such as filter plate surface wear, filter cloth damage.

Drug use:

Improper selection of agents leads to poor coagulation and flocculation effect of sludge.

Insufficient or excessive dosage of agent will affect the dewatering effect of sludge.

Insufficient preprocessing:

Before the sludge enters the filter press, it is not fully pre-treated, such as dehydration, drying and other steps, resulting in a higher moisture content of the sludge.

Two, solution

Improve sludge properties:

By adjusting the chemical properties of the sludge, such as pH value, ionic strength, etc., to improve the dewatering performance of the sludge.

The use of sludge conditioner or flocculant, so that the sludge form larger particles, reduce the specific surface area, thereby reducing the moisture content.

Optimize filter press operation:

Adjust the press pressure and press time to ensure that the water in the mud cake can be fully discharged.

Select the appropriate filter material and model, and regularly clean the filter cloth to keep it unimpeded.

Ensure that the pressing force and pressing time of the filter press are sufficient to ensure the tightness of the filter chamber.

Upgrade filter press equipment:

Upgrade or transform the existing filter press equipment, such as replacing the filter plate with better sealing performance and using a more wear-resistant filter cloth.

Regular maintenance and maintenance of the filter press equipment to ensure that it is in good working condition.

Rational use of medicine:

According to the nature of sludge and treatment requirements, select the appropriate type and dosage of chemicals.

Determine the best dosage ratio and method of the reagent through the experiment to achieve the best coagulation and flocculation effect.

Enhanced pretreatment:

Before the sludge enters the filter press, strengthen the pretreatment steps, such as removing part of the water and impurities by precipitation, filtration, etc.

Use pre-drying equipment to pre-dry the sludge and reduce its moisture content.

In summary, in view of the problems of long mud pressing time, mud cake pressing and high moisture content, comprehensive analysis and improvement need to be carried out from the sludge properties, filter press operation, filter press equipment, pharmaceutical use and pretreatment. By taking the above measures, it can effectively improve the efficiency and quality of mud pressing, reduce the moisture content, and realize the reduction, harmfulness and resource utilization of sludge.