Sludge dewatering is the important part of sewage treatment system. After being concentrated and digested, the sludge still has a water content of about 95% to 97%, and the volume is still large. Additionally the sludge contains a large number of harmful toxic substances, such as parasite eggs, heavy metals, etc., useful substances such as phytonutrients, organic matter and water.

For waste minimization and cost efficiency disposal, the sludge needs to be dewatered. The purpose of sludge dehydration is to remove the water between and within the sludge particles, so that sludge reduction, stability, harmless, and comprehensive utilization.

The ideal dehydration should be to remove the maximum amount of water, while the solids of sludge should be retained entirely on the dried mud cake, and the investment required for this operation is the lowest.

1. Reduce the sludge volume.
2. Reduce the size of equipment and operating costs
3. To optimally resource utilization
4. Help with company’s sustainability objectives

Sludge dewatering methods:
A.Natural drying dewatering
Natural dry dewatering is to placed sludge on the drying field and realize dewatering through evaporation, infiltration and overnight overflow. However, the intensive maintenance management and easier produced a wide range of stench. Only suitable small sludge treatment plants.

B.Mechanical dewatering
Mechanical dewatering is the use of mechanical equipment for sludge dewatering. Compared with natural drying, it has less land occupation and less stench.

There are various technologies for mechanical sludge dewatering: vacuum filtration dewatering, pressure filtration dewatering, centrifugal dewatering, screw press dewatering. The equipment are including plate and frame and belt filter presses, centrifuging, and geomembranes. In addition to these, there are other options available.
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