There are many reasons why the plate and frame filter press does not press mud and sticks to the filter cloth, the following is a detailed analysis of these reasons:
One. Equipment factors
Feed pump failure
If the feed pump fails, it may lead to insufficient feed pressure, which in turn affects the dehydration rate.
Filter cloth problem
Filter cloth selection error: different sludge properties require different materials and pore sizes of filter cloth, improper selection will lead to poor filtration effect.
Filter cloth cleaning is not clean or blocked: After a long time of use, the filter cloth may be blocked or polluted, affecting the dehydration effect.
Poor filter cloth material: Some filter cloth materials may be more likely to adsorb fine particles and organic matter in the sludge, resulting in increased adhesion.
Short extrusion time or low extrusion pressure
Short extrusion time or insufficient extrusion pressure may lead to insufficient dehydration of sludge.
Two. Pharmaceutical factors
Drug selection error
According to different sludge properties, different coagulants and coagulants should be selected. The wrong selection may lead to the poor flocculation effect of sludge, and then affect the dewatering effect.
Insufficient or excessive dosage
Insufficient amount of additives will lead to poor flocculation effect and high water content of sludge; The addition of excessive agents may lead to sticky sludge, which is easy to adhere to the filter cloth.
Three, sludge properties
The sludge is too fine and sticky, and the sludge with more fine particles and high-viscosity substances is easy to adhere to the filter cloth, resulting in difficult dehydration.
High organic matter content
Sludge with high organic matter content, especially sludge containing organic matter such as protein and oil, will increase the viscosity of the sludge and make it easier to adhere to the filter cloth.
Four. Operational factors
Improper filtration pressure
Too high or too low filtration pressure will affect the formation and adhesion of filter cake.
The filtering period is too long
The filtration cycle is too long, and the mud stays on the filter cloth for too long, which is easy to increase the adhesion.
Less timely or incomplete cleaning of filter cloth
If the filter cloth is not cleaned or cleaned thoroughly for a long time, the pores may be blocked and the adhesion will increase.
Uneven feed
Uneven feed will lead to high mud concentration or uneven particle distribution in some parts, which is easy to adhere to the filter cloth.
V. External factors
Upstream process changes
Changes in upstream processes may lead to changes in sludge properties, thus affecting sludge conditioning and dehydration effects.
Environmental factors such as temperature, acidity and alkalinity
Changes of environmental factors such as temperature, acidity and alkalinity may also affect the dewatering performance of sludge.
In summary, the reasons why the plate and frame filter press does not press mud and sticks to the filter cloth involve many aspects such as equipment, chemicals, sludge properties, operation and external factors. In order to solve this problem, it is necessary to consider these factors comprehensively and take corresponding measures to improve and optimize.