018316-01 – Installation & Operation Guidelines for BN BioDisc
Page 13 of 15
9.2
Sludge Removal
9.2.1
Refer to the illustration below for recommended de-sludge positions. (Note: Illustration is typical;
individual units may vary).
9.2.2
Isolate power to the BioDisc (and Pump Station if applicable) at the Control Panel(s).
9.2.3
Undo the BioDisc cover latches and fold back the hinged cover sections as required to gain access.
Alternatively the covers can be completely removed if wished. Hinged sections should be folded
back before lifting off.
9.2.4
Remove any surface scum from the Final Settlement Tank [A]. The steel mesh may be removed for
access if required. Lower the hose to the bottom of the tank and remove any settled sludge. Also
de-sludge at points [D] on either side of the rotors and along the length to prevent ‘rat-holing’. The
steel mesh over points [D] may be removed for access if required. Replace any removed steel mesh.
9.2.5
Remove surface scum from the BioDisc Primary Settlement Zone at point [B] and de-sludge at
points [C] on either side of the rotors. De-sludge along the length of the rotors to prevent ‘rat-holing’.
The steel mesh over points [B] and [C] may be removed for access if required.
9.2.6
Note:
While de-sludging ensure that there is never more than 250mm difference in water levels
between points [A] and [C].
9.2.7
DO NOT
attempt to remove any liquid from any Rotor Section.
9.2.8
DO NOT
attempt to clean off the gelatinous growth on the rotors.
9.2.9
Ensure that the BioDisc inlet and outlet pipes [E] and the Forward Feed Buckets [F] are free of
debris.
9.2.10 Ensure that all safety meshes are replaced, then close and lock the BioDisc covers.
9.2.11 Units with separate Primary Tank only - Remove the covers from Primary Settlement Tank. Remove
any surface scum in the Primary Settlement Tank, then lower the hose into the bottom of the tank
and completely remove settled sludge. It may be necessary to empty the tank completely to ensure
full sludge removal. Ensure that the inlet and outlet pipes are clear of debris, and then replace the
covers.
9.2.12 All units - Re-connect the power supply. Wait for two minutes. If the alarm on the control Panel
does not activate, this indicates that the Rotor has successfully re-started. If the alarm activates,
switch off the power at the Control Panel and immediately switch on again. If the alarm continues to
activate, isolate the power supply and notify the plant owner so that the problem can be investigated.
B
C
A
D
D
F
C
C
C
F
E
E
