Choosing a Sludge Dewatering Decanter Centrifuge



While choosing a sludge dewatering decanter centrifuge, several different factors must be considered. such as,

  • solids retention time

  • solid specific gravity

  • liquid specific gravity

  • power consumption of the machine

  • capital cost

  • operating cost

The retention time of solids in a sludge centrifuge

The retention time of solids in a slurry centrifuge can be adjusted by increasing the differential speed.

  • Higher differential speed results in a wetter cake.

  • Lower differential speed results in a cake that is too dry.

  • Higher Solids leads to wetter cake.

  • Lower Solids leads to dryer cake.

  • Higher density solids leads to dryer cake.

  • Lower density solids leads to wetter cake.

The retention time of solids in a slurry centrifuge is important to ensure that the sludge is removed properly.

  • Too long a retention time leads to excess solids accumulation and reduces the separation efficiency.

  • A shorter retention time also decreases the amount of sludge that is discharged, which increases the frequency of discharges and reduces the centrifuge’s service life.

Efficient Solids removal depends multiple factors.

  • g force or centrifugal force or rotating speed of bowl

  • pond depth setting

  • hydraulic throughput rate.

  • A higher flow rate matched with higher g force produces cleaner centrate.

  • higher differential speed increases the number of solids compacted.


Power consumption of a sludge centrifuge

  • A sludge uses centrifugal force to speed up sedimentation of smaller particles.

  • The solid basket centrifuge is used most often for continuous and reliable sludge thickening and dewatering.

  • Feed is continuously pumped into the centrifuge, while the center is removed through an overflow weir.

  • Power consumption of Decanter centrifuge is directly proportional to the flow rate.

  • Higher flow rate increases power consumption.

  • Likewise, Lower flow rate decreases power consumption.

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