The high water content of sludge cake in sewage treatment plant may be caused by a variety of factors. The following is a detailed analysis of the possible causes and solutions:

Possible cause

Bad preparation of sludge pretreatment: sludge treatment enterprises are not strict in the type and concentration of reagents, which may lead to poor pretreatment effect of sludge, and then affect the moisture content of mud cake.

The adjustment of integrated belt filter press is not in place:

Belt speed adjustment too fast: make the mud cake thin, resulting in a decrease in solid content.

Improper tension setting: the tension is too large or too small, will make the belt filter press can not achieve enough pressing force, so that the moisture content of the mud cake is higher.

Belt filter press filter cloth problem:

Filter cloth wear is serious: the sludge has not been filtered out, forming a mud cake with low solid content.

The length of the filter cloth is not suitable: too long is easy to make the filter cloth uneven, too short, the tension is large, the gap is large, and the sludge filtration is not good.

The sludge is complex: the content of organic matter is very high, and the hydrophilicity of sludge particles is too strong, resulting in difficult dehydration.

Sludge conditioning is not successful: it is not conditioned according to the quality of sludge, which destroys the hydrophilicity of sludge and affects the dehydration effect.

The pressure of the sludge dewatering equipment is too low: the degree of sludge extrusion is not enough, which is one of the main reasons for the high water content of the sludge.

solution

Optimize the reagent dispensing: select the appropriate sludge thickening reagent, and strictly control its type and concentration to ensure the sludge pretreatment effect.

Adjust filter press parameters:

Appropriately reduce the belt speed: make the mud cake thicker and improve the solid content.

Adjust the tension: ensure that the belt filter press can achieve sufficient press force.

Replace or repair the filter cloth: regularly check the wear of the filter cloth, timely replacement or repair to ensure the normal use of the filter cloth.

Improve sludge sludge: Improve sludge sludge by physical, chemical or biological methods to reduce organic content and the hydrophilicity of sludge particles.

Optimize sludge conditioning: According to the sludge quality of the tailored conditioning, destroy the hydrophilicity of the sludge, improve the dehydration effect.

Increase the pressure of sludge dewatering equipment: Choose a sludge dewatering equipment with higher pressing power, or upgrade the existing equipment to improve the extrusion degree of sludge.

In addition, other sludge dewatering methods can also be considered, such as gravity enrichment method, pressure filtration method, centrifugal dewatering method or air floating-gravity enrichment method, etc., and the appropriate treatment method can be selected according to the actual situation.