It is the first of these functions that is the focus of this paper. Although thickener rakes are essential signs, sign and operation can reduce the likelihood of ratholing, out transport due to rake action in thickeners.
arse material can create islands that give uneven high torque levels (with peaks at 2 or 4 times the rake rotation frequency) and rotating masses or doughnuts also cause rake torque to increase (with cycles equal to the rake rotation frequency).Measurement can be by hydraulic pressure, load cells or torque arms
Location of the thickener in a wastewater treatment plant is important. digested, thickening a blend of primary and waste activated sludge is a good practice. watering . Both ncentration and volume reduction.
nstructed with flat bottoms and heavy duty rake drive mechanisms to move the sludge to the center outlet. The flat bottom cylindrical thickener provides 3 times the ne and, hence, 3 times the retention time.
The tip speed of the outer rresponds to the same tip speed as that in a 40 m thickener operating at a rake speed of 3 rev h 1 (20 min rev 1). Rake sign The rake arms are made from slotted rectangular section plate and the blades are bolted to sired positions and angles. 2.
blade rake, ove the rake arm (location 3) moves The outward motion seen in Fig. 15 unter to the rake direction although it also moves slowly excessive raking in the outer parts of the tank resulting inwards (see streamlines in Fig. 19). from uniform rake blade size (nventional unterintuitive,