When to Clean Off-site?
Some facilities do not have Clean-In-Place (CIP) systems, while others are averse to handling chemicals, are unable to achieve an efficient cleaning due to equipment limitations, or are limited by local discharge restrictions. In such cases, fouled membranes are replaced by a spare set and sent to an off-site facility for cleaning.
Membrane element cleaning is performed at an off-site facility with very stringent cleaning procedures with membrane testing performed before and after cleaning. All membranes are then preserved in an NSF approved bacteriostatic solution and vacuum sealed to ensure a long shelf life. A report is provided to the customer showing the extent of improved performance due to cleaning.
- All testing performed according to membrane manufacturer test conditions.
- Membranes are tested and compared to manufacturer specifications before and after cleaning.
- Cleaning chemicals are selected based on suspected foulants or autopsy results where available.
- Stringent procedures are followed to ensure a successful outcome.
- Cleanings are repeated until satisfactory results are obtained.
- Membranes are preserved and vacuum sealed to prevent biological growth during storage.
- A report comparing flux and salt rejection before and after cleaning is provided.