Chemical Evaluations
Chemical Evaluations are critical to ensuring the optimal performance and longevity of Reverse Osmosis (RO)
membranes and spiral wound Nanofiltration (NF) units. These evaluations include
Chemical Compatibility Testing to assess whether
chemicals are safe for use with specific membranes.
Cleaning Evaluations focus on determining the
effectiveness of cleaning protocols in removing fouling, scaling, or biofilm.
Performance Challenges involve intentionally
inducing scaling or fouling on membranes then applying chemicals to evaluate their effectiveness by
comparing performance before and after.
Chemical Compatibility Testing
Chemical Compatibility Testing is a critical
component of ensuring the safe and effective use of cleaning agents with (RO) membranes. This testing
involves two primary steps: two-hour cleaning tests and two-week soak tests. By combining these tests,
Chemical Compatibility Evaluations provide a comprehensive understanding of how cleaning agents
interact with membrane materials, ensuring safety in maintaining RO system performance.
Chemical Cleaning Evaluation
A DHP RO Membrane Chemical Cleaning Evaluation
provides a Client with the best cleaner(s) and the best procedure to use to chemically clean an already
fouled and/or scaled RO membrane or spiral wound NF unit. DHP does not sell equipment or chemicals, so
the results of the Cleaning Evaluation are unbiased.
Before Cleaning
After Cleaning
After Cleaning
Performance Challenge
A Performance Challenge is a targeted
evaluation method used to test the effectiveness of chemicals on RO membranes. In this process,
new/unexposed membranes are intentionally subjected to controlled fouling or scaling. Once the fouling or
scaling has been induced, a separate test is conducted using chemicals under the same conditions. The
results are measured by comparing permeability & salt rejection before and after chemical
introduction.
Click on the picture below for more details
on a DHP Chemical Compatibility and Performance Challenge Report
