The reason why the sludge sticks to the filter cloth

The issue of sludge properties

When the organic matter content in sludge is too high, its viscosity will increase. For instance, municipal sludge contains a large amount of microbial metabolic products. These substances enhance the viscosity between sludge particles, making them prone to adhering to the filter cloth. In addition, if the sludge particles are too fine, it will also increase the possibility of adhesion. Fine particles are more likely to fill the pores of the filter cloth, causing clogging and adhesion.

Improper operation parameters

Excessive filtration pressure will cause the sludge to be overly squeezed, resulting in the water and sticky substances in the sludge being squeezed out and adhering to the filter cloth. If the filtration time is too long, the sludge will stay on the filter cloth for a longer period, which will also increase the probability of adhesion. Moreover, if the feeding speed is too fast, the sludge does not have enough time to be evenly distributed in the filter press chamber. If the local sludge concentration is too high, it is also prone to sticking to the filter cloth.

Filter cloth selection and maintenance issues

The material and pore size of the filter cloth are not properly selected. If the pore size is too small, sludge particles are prone to clogging the filter cloth. If the material is not corrosion-resistant, the performance of the filter cloth will decline when it comes into contact with some corrosive sludge, causing the sludge to stick. If the filter cloth is not cleaned thoroughly, the residual sludge will gradually accumulate, making the surface of the filter cloth rough and more prone to adhering to new sludge.

Recommended agent - Sludge enhancer

Sludge enhancers can effectively solve the problem of sludge sticking to the filter cloth in plate and frame filter presses. It can change the particle structure of sludge, creating larger voids between sludge particles and reducing the viscosity of sludge. Meanwhile, the sludge enhancer can regulate the moisture distribution of the sludge, making it easier for water to separate from the sludge and reducing the contact time and viscosity between the sludge and the filter cloth. After using the sludge enhancer, the filtration efficiency can be improved, the service life of the filter cloth can be prolonged, and the operating cost can be reduced.