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Application of Decanter Centrifuge in Sludge Dewatering Treatment

Nowadays, water environmental pollution issues are frequent all over the country, and the environment at the source of the Yangtze and Yellow Rivers is rapidly deteriorating; the Huaihe River pollution control has spent a lot of manpower, material and financial resources and still cannot prevent the results from failing; the east route of the South-to-North Water Diversion Project has been delayed repeatedly due to pollution; especially Rivers in the city are responsible for flood discharge and flood discharge. The decanter centrifuge is an important part of urban construction, and it has an irreplaceable effect in improving environmental quality and sceneries. However, with the development of the economy, the total amount of urban sewage discharge continues to increase, and the water quality of the river is becoming more and more serious, and the phenomenon of malodor appears, which is inconsistent with the quality of the living environment of modern society and is inconsistent with the sustainable development of the social economy and the environment. Bringing severe challenges, but also brought a lot of pressure on local governments. Traditional river dredging projects use the method of excavation, transportation and storage, directly digging the river bottom mud ashore, and then simply landfill it.

Using traditional methods to treat river sludge will produce a lot of sludge, which will lead to difficult transportation, loading and unloading, high cost, large storage area, and no direct landfill, which will cause severe environmental secondary pollution problems. Under normal circumstances, the thickness of the contaminated bottom sludge in the river is uneven and the change is large. Most of it is distributed in a semi-suspended state at the bottom of the river bed. The suspended sludge cannot be removed during the construction process of hook excavation, and the sludge is simply drifted downwards. , Pollute the downstream environment. At present, the cutting suction method is used in the more advanced dredging technology. During dredging, the sludge within the disturbance range of the cutter is fully sucked by the mud pump, which effectively prevents the sediment particles from dispersing to the water body due to the disturbance of the cutter. There are no dead corners to prevent secondary pollution due to excavation during construction. This kind of cutter suction technique is fully capable of sucking debris, silt, solid soil and wastes from the river bottom onto the shore. The sludge sucked up by this technology needs to be dehydrated to meet the needs of landfill or comprehensive utilization.

Using a decanter centrifuge for 24-hour continuous operation, the moisture content of the mud cake is reduced to 35%-40%, and the removal rate can reach more than 95%. The decanter centrifuge has a small area and can be fully enclosed. , The operating environment is clean and hygienic, and it is especially suitable for sludge dewatering operations in villages and towns in densely populated areas, which can effectively reduce sludge transportation and landfill space. Compared with other mechanical dewatering performance, the decanter centrifuge has unparalleled advantages. After using a decanter centrifuge to suck up the sludge at the bottom of the river by a cutter suction dredger, the sludge and sewage are pumped to the rotating drum grid to remove bricks, big stones, dead branches, plastic bags, footwear and other large wastes. , And then remove the strip-shaped soft impurities through the mechanical grille, and then remove the sand through the sand remover. The sludge and sewage will be concentrated by the homogenization tank, and after the concentration is 10% to 15%, the mud water will be scraped out through the bottom scraper and sent to the high The dryness river sludge dewatering machine is dehydrated, and the solid content of the sludge after dewatering reaches 65% (the water content is around 35%).

It can be seen that the use of a decanter centrifuge to clean the silt in the river can clean the silt in the river without secondary environmental pollution. Because of its inherent characteristics of large processing capacity, automatic operation, and good dehydration effect, it has been widely used and promoted in the field of environmental protection. Su Dong reminds everyone that because the decanter centrifuge is operating in a silt environment, it should be maintained during normal use. If you don’t know anything, you can consult Su Dong’s technical staff.


Jiangsu Sudong Chemical Machinery Co., Ltd. was established in June 1956. It has been engaged in the research, design and manufacture of filter presses for more than 30 years.
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