Clogged membrane before cleaning (courtesy of Dr.-Ing. Frey)
To prevent the membranes from fouling it is strongly recommended to clean the membranes periodically.
The most common techniques are:
- Running the diffusers with the maximum overload airflow (air bumping) for a short period of time.
- Inject formic acid into the airflow
- Flush the whole system with acid or alkaline solution
- Dewater the tank and blow off the fouling with an high-pressure water jet
Flushing the membrane with acid solution (courtesy of Dr.-Ing. Frey)
One way to clean the membrane is to flush it with acid solution.
The diagram shows the head loss of diffusers before and after cleaning with air pressure washer.
Green line: after cleaning
Red line: before cleaning
Blue line: reference diffuser