Optimized Antiscalant Dose Results in Significant Savings
A potable water treatment plant struggled to understand differences in fouling depositions between the lead and tail end membranes of their system as well as how to optimize their pretreatment and cleaning chemicals. The Avista Black Box was used to troubleshoot and apply the right chemistry, resulting in cost savings for the customer.
hallenge: Understanding foulant composition to optimize pretreatment and cleaning chemicals.
Pretreatment: Greensand filters
Existing Chemical Used: Chlorine, sodium bisulfite, and antiscalant at a dose rate of 4.4 ppm
Feedwater: Well water
Application: Potable water
Two sets of Avista™ Black Boxes were installed at the (Hutchinson) site and identified as Phase I and Phase II. The Phase I Avista™ Black Box™ evaluated the system performance using the existing pretreatment chemicals and a competitor’s antiscalant.
Phase II operated using Avista’s Vitec 1400 antiscalant. The customer wanted to discover the following using the Avista Black Box technology:
- Identify any differences in fouling depositions between the lead and tail end membranes.
- Identify any difference in fouling deposition between the use of Vitec 1400 antiscalant and the existing pretreatment chemistry.
- Optimize cleaning chemicals to improve and restore membrane permeability.
OFF-SITE TROUBLESHOOTING WORK/FINDINGS
Black Box Analysis: Performance data from the two Black Boxes and full-scale system were normalized. The lead Black Box operating with the competitor’s antiscalant showed a greater loss in flux as compared to the Vitec 1400.