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.