The problem of high water content of sludge cake after municipal sludge treatment may be caused by many factors. Here are some possible causes and explanations for the problem:
Sludge characteristics:
High microbial content: municipal sludge often contains a large number of microorganisms, these microorganisms need water during the growth process, so the high microbial content is one of the important reasons for the high water content of the sludge.
High organic content: the organic matter in the sludge is easily dissolved in water, and the high organic content is another main reason for the high water content of the sludge. These organics include some hydrophilic substances, which increase the difficulty of dewatering the sludge.
Sludge treatment process:
The choice of sludge treatment process and operating conditions will affect the final water content. For example, pressure filtration and centrifugal processes, while capable of reducing water content, may not be able to treat high-water content sludge; Although the drying process is suitable for a wide range of pollutants, it has a high energy consumption.
Filter press operating parameters:
If the pressure is insufficient or the filtration speed is too fast, the water in the sludge may not be fully discharged, resulting in an increase in the water content of the mud cake.
The choice of filter cloth is also very important, if the filter cloth aperture is too large or too small, it may affect the dehydration effect.
Equipment status:
The poor sealing performance of the filter press may cause the sludge to leak out during the dehydration process and reduce the dehydration effect.
Wear or damage to components such as filter plates and filter frames may also affect the dehydration effect.
Sludge concentration and flocculation efficiency:
When the sludge concentration is low, the direct use of mechanical dewatering effect is poor, and the amount of water purification agent is increased.
When the flocculation efficiency of sludge is low, the capillary water in sludge cannot be converted into free water and removed, which affects the dehydration effect.
Other factors:
The uneven distribution of sludge in the filter press may lead to inadequate dehydration of some sludge.
The amount of mud in the filter press is not stable, which may also affect the dehydration effect.
In order to reduce the moisture content of sludge cake after municipal sludge treatment, the following measures can be taken:
Pretreatment of sludge, such as adding conditioner to change the properties of sludge, improve the dehydration effect.
Optimize the operating parameters of the filter press, such as adjusting the pressure, filtration speed, etc., to find the best dehydration conditions.
Improve the equipment condition of the filter press, such as replacing the filter cloth with better sealing performance, repairing worn parts, etc.
Comprehensive consideration of sludge properties, treatment technology, equipment conditions and other factors, to develop a reasonable treatment program.
Through the comprehensive application of the above measures, the moisture content of the sludge cake after municipal sludge treatment can be effectively reduced, and the efficiency and quality of sludge treatment can be improved.