The mud cake treated by sewage works has a "runny" problem, that is, the mud cake is not sufficiently consolidated inside. The possible causes and solutions are as follows:

Possible cause

Insufficient pump pressure:

If the mud cake pressed by the filter press is normal at the beginning, but the mud cake appears "runny" after a period of time, it may be because the pump runs for a long time, resulting in wear of the impeller, which makes the pump pressure is not enough.

Improper sludge conditioning:

Sludge conditioning is an important link in the sludge treatment process, if the conditioning is not correct, such as improper selection of flocculants or insufficient dosage, it will lead to rapid solid-liquid separation of mud and water in the sludge, thus affecting the dehydration effect of the sludge.

The filtering time is too short:

Insufficient filtration time may result in insufficient dehydration and consolidation of the mud cake.

Suspension concentration is too low:

The concentration of suspension has influence on the consolidation and dewatering effect of mud cake. Too low concentration may result in unsatisfactory consolidation effect of mud cake.

Filter cloth problem:

The state of filter cloth will also affect the consolidation effect of mud cake. If the filter cloth is damaged or aged, it may affect its filtration and consolidation ability.

Solution

Increase filtering time:

Extend the filtration time to ensure that the mud cake is fully dehydrated and consolidated.

Increase filter pressure:

Moderately increasing the filtration pressure can increase the compaction effect of the filter press on the mud cake and promote the consolidation and dehydration process. However, it should be noted that too high filtration pressure may lead to filter cloth damage or other problems, so the filtration pressure should be adjusted according to the specific situation.

Optimize sludge conditioning:

Select the appropriate flocculant and adjust the dosage to ensure that the sludge water in the sludge can be quickly solid-liquid separation.

Increase the concentration of suspension:

If the concentration of the suspension is too low, the content of the solid substance can be moderately increased to improve the consolidation effect. However, pay attention to avoid other problems caused by high concentration.

Check and replace the filter cloth:

Check the condition of the filter cloth regularly to ensure that it is complete, clean and properly installed on the filter plate. If the filter cloth is damaged or aged, it should be replaced or repaired in time.

Adjust filter plate design and filter press operating parameters:

Check whether the design of the filter plate is reasonable, and whether the operating parameters of the filter press are appropriate, and adjust or optimize as needed.

To sum up, the solution to the problem of "runny" sludge cake in sewage plants needs to start from many aspects, including increasing the filtration time, increasing the filtration pressure, optimizing the sludge conditioning, increasing the concentration of suspension, checking and replacing the filter cloth, and adjusting the filter plate design and filter press operating parameters.