THIKNER
Sludge thickening is the process of increasing solids content of sludges from primary and/or
secondary settling tanks. The process serves to reduce the size of the subsequent sludge
dewatering steps. Influent sludge is fed to the center of the tank and thickened sludge is pushed
to central hopper by scraper blades, concentrated sludge is drawn off either hydrostatically or
by a pump and sent to further sludge processing steps. Generally, picket fences are installed on
scraper arms in order to provide gentle mixing of the settled sludge for better consolidation. For
continuously fed sludge thickeners, the supernatant is collected by weirs which are installed at
periphery.
Accessories:
• Local control panel
• Foot bearing
• Hopper scraper blade
Drive unit assembly
It is installed on the bridge and consists of motor, gearbox, and central bearing. Center bearing
is designed and sized to absorb and withstand all vertical and horizontal loads. Drive unit
transfers the motion to the vertically mounted drive shaft. The drive unit can optionally be
protected by torque limiters against overloading. An antifriction large diameter geared bearing
is used as center bearing.
Feed well
The center feed weal is made of mild steel or stainless steel and is bolted to the bridge.
Drive shaft
Drive shaft is made of mild steel or stainless-steel standard pipe or folded plate and serves to
transfer the motion from drive unit to scraper blades and the picket fences.
Bottom scraper system
Bottom scraper system consists of bottom scraper arms, made of standard pipes or folded
plates, and scraper blades. Scraper blades quantity varies according to the tank dimensions.
Replicable hard rubber is bolted at the edges of the blades.
Picket fences
Picket fences consist of vertical rods connected to scraper arms. Since the vertical rods are
clamp connected at top and bottom of arms, the distances between the rods can be easily
adjusted.
Outlet weirs
V-notch weirs in accordance with DIN 19558 is available for standard applications but special
notch shapes are manufactured depending on client request.
