4 Common Questions about Belt Filter Presses

Juin 26, 2025

Belt filter presses are accepted by most sewage treatment plants because they can discharge a lot of sludge quickly and can operate continuously. They are especially suitable for sewage treatment plants that need to quickly reduce sludge concentration. However, you may encounter some problems during the application process. This article will answer these common questions for you and tell you how to deal with these situations.

Equipment and machinery will inevitably encounter various faults in production. The main locations where belt filter presses often have problems are filter belts, rollers, bearings, deviation correction, etc.

Q1: What causes the filter belt to slip?

A1: The filter belt slip is mainly caused by overload of mud inlet, insufficient tension of the filter belt, flocculant on the surface of the driving roller, wear of each roller, or inflexible extrusion and rolling. At this time, the amount of mud inlet should be reduced; check whether the air pipe connected to the cylinder is leaking, whether the tensioning pressure of the filter belt is appropriate and make corresponding adjustments; carefully check whether each roller press has inflexible rotation or local wear, and strengthen the lubrication of bearings and gears.

Q2: What should I do if the filter screen deviates too much or causes wrinkles?

A2: During the normal operation of the belt filter press, when its internal deviation adjustment device cannot be in normal working condition due to various reasons, it will cause the filter screen to deviate from the line or wrinkle.

At this time, the air pressure of the belt filter press should be checked first. If the air pressure is normal, the deviation valve should be further checked to see if it has been damaged to a certain extent during operation.

The filter screen induction roller should also be checked to see if its position has deviated during operation. Then check whether the connecting rod mechanism that controls the movement of the roller is still in a sensitive operating state; check the cylinder to see if it has air leakage.

Q3: Why does the solid content of the mud cake decrease? How to solve it?

A3: When using a belt filter press to treat sludge, it is sometimes found that the moisture content of the sludge filter cake obtained after treatment is far higher than the national standard. There are many reasons for this problem. For example:

The dosage or type of flocculant is not suitable for the change in sludge properties or sludge inflow, resulting in a decrease in the dehydration of the sludge. At this time, another test should be carried out to select the optimal type or dosage of flocculant.

The belt speed is too fast, the belt filter press does not squeeze the sludge and the retention time in the pre-dehydration section is not enough, making the mud cake thinner and the solid content lower. The countermeasure is to reduce the belt speed.

The filter belt tension is too small, the squeezing force on the sludge is insufficient, and the solid content of the mud cake after dehydration is reduced. At this time, the filter belt tension should be appropriately increased, and the pressure of the belt filter press is generally adjusted to 0.5-0.6MPa.

The filter belt is blocked, the water cannot be filtered out, the moisture content of the dehydrated sludge increases, the filter belt joints are unreasonable or damaged, and the filter belt is aged. The machine should be shut down immediately, and the sludge on the filter belt should be flushed before it is put into operation; repair or replace the filter belt.

Q4: How to operate the automatic shutdown of the main machine?

A4: The filter screen has deviated and exceeded the limit due to some reasons. In order to ensure that other parts of the belt filter press will not be further damaged, the protection device will automatically turn on, which will cause the main machine to automatically shut down.

At this time, check whether the tension of the filter screen meets the working conditions. If the tension is too large, the belt screen can be properly loosened and manually moved to return to its normal position, so that the protective device can be released from the protective state. Wait for it to operate normally before positioning the travel switch.

Jingjin is a reliable filter press supplier, aiming to provide customers with high-quality filter presses. If you are looking for a high-quality filter press, perhaps Jingjin filter press is your best choice. Sure, if you have any questions, please feel free to contact us at any time!