Advice on Re-Screening MLSS in bioreactor to further reduce solids and protect membranes
For membrane bioreactors, it is essential to keep solids over 2mm out of the membrane chamber and away from the membrane fibers.
If, for any reason, solids larger than this are inside the tank, they should be removed so they do not become lodged inside the membrane cassette.
One method to do this is to install a submersible pump in the anoxic chamber which pumps MLSS back into the headworks screen for removal.
To do this, ensure the headworks screen can handle the additional flow of the pump you install.
Below is a photo of a line plumbed in to the anoxic zone. A submersible pump rests on the bottom of the tank and the discharge is into the air vent of the screen (circled in yellow). If the zone has other components within it such as submersible mixers, ensure the components don't interfere with each other.
Also included below is an example parts list to leverage.
Below is an example of a parts list:
- Get:
- Submersible pump from Home Depot with- highest GPM Unit available in 120V that is below 10 amps (so we don’t trip breakers).
- Such as (both in stock in SE Austin Home Depot)
- Check the pump discharge and use 1.5 or 2” Sch. 40 PVC plumbed into discharge of pump with a male adapter and ran wild till set in the drink, then goose necked over into screens in a temporary manner with sch. 40 piping, taping/wiring/zip tying to handrail and tie it into the vent line at the top (remove the vent cap and there’s a 2” hole), so we don’t defeat the safeties.
- Get
- Male adapters
- 30’ pipe
- 3 couplings
- (4) elbows
- Glue and primer
- (2) 50’ cords rated for 15 amps or more
- Electrical tape (to wrap cords for weatherproofing and preventing disconnection)
Plug
it in and run it non-stop into the screen
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