Membrane cleaning has changed both quantitatively and qualitatively in the past 40 years but there are basic steps that should be followed. Cleaning time, temperature, hydrodynamic conditions, and concentration of cleaning agents all affect membrane-cleaning efficiency, Cleaning membranes can be costly and ineffective cleaning more so. Most membrane cleaning is done in place, generally when the flux rate through the membrane decreases by 10% and/or the TMP increases by 10% and/or the permeate water quality decreases by 10%. The typical clean-in-place (CIP) sequence for membrane systems includes a pre-rinse, detergent soak, post-rinse, acidified soak, a second alkaline soak supplemented with chlorine when the membrane is compatible with oxidizing agents, and a final rinse. The mechanisms involved may include dissolution, chelation, oxidation, hydrolysis, and emulsification. Cleaning protocols should be developed and adapted for each application and location. This talk will outline the steps needed to develop a safe and effective cleaning regime which include: 1. Characterize the foulant (type and composition) 2. Identify the most severe fouling scenario 3. Select cleaning techniques and chemicals 4. Define “clean acceptance criteria” 5. Identify and prepare the equipment needed 6. Develop SOPs and training 7. Implement cleaning regime 8. Verify/troubleshoot using membrane autopsies
This presentation is available to AMTA Members only.
Speaker
- Carlyn Higgins
Company
- Hazen and Sawyer
Event
- AMTA Membrane Cleaning Webinar Part 1, Online
Session
- Membrane Cleaning Webinar Series
Date
- 11/16/21
Media
Keywords
- Cleaning, Membranes, MF/UF/RO
Reference
- 9610-DP2553