Clarifier Cleaning
The filter cake of trapped solids will eventually reach a density sufficient to impair the flow, and for efficient operation of the clarifier screens it is vital that a regular cleaning regime is maintained. The high open area and smooth surface of the mesh simplifies cleaning either manually with a hose pipe or by automated cleaning options.
Manual Backwashing
This is the usual method employed for horizontal end flow, pyramidal and small circular tanks. It is recommended that the water level is lowered and the screens thoroughly backwashed once per week. Where solids loadings are light this interval can be increased to every 2 weeks. A 45m2 tank can be hosed clean in around 20 minutes.
Where no suitable wash water supply exists on site, Locker can provide a GRP boxed -out zone in the tank to provide a sump for use with a portable pump cleaning kit. A 2 ins. pump delivering 600 l/min.max, 29m head max is recommended.
If the site has a suitable electrical supply, a submersible pump cleaning kit with delivery hose and adjustable spray nozzle is available. The pump is suspended by a stainless steel chain into a suitable area of the tank.
Locker Auto-Cleaner
This is employed on radial tanks and is mounted on the rotating half-bridge.
On the cleaning cycle the vacuum head is lowered below the water line to be close to the upper surface of the screens, the pump is activated and flocculated solids are sucked up through both layers of mesh and returned as a slurry to the central diffuser box.
The tank remains in operation during cleaning.
The image shows the clarifier screens installed as an annulus complete with a new inner baffle board. The existing scraper leg assembly is modified as necessary.
Spray Jet Backwash
An automated or semi - automated system of submersible pump and spray jets mounted above the screens is also available for all types of tanks.
Contact us with your site details and tank dimensions for a budget price.
Next see Clarifier Performance.