New research supported by ASHRAE indicates that non-chemical devices (NCD) marketed to control the growth of biological agents, such as Legionella in cooling towers, may not materially reduce biological growth.
Research project No. 1361, Biological Control in Cooling Towers Using Non-Chemical Water Treatment Devices, a two year project recently completed by Dr. Radisav Vidic at the University of Pittsburgh, evaluated five non-chemical devices using different technologies to control biological activity in a model cooling tower system. The devices studied included a hydrodynamic cavitation device, pulsed and static electric field devices, an ultrasonic device and a magnetic device.
In Vidic’s research, none of the non-chemical devices measurably reduced planktonic or sessile microbial populations in comparison to no-treatment tests and to a conventional chemical microbial control treatment protocol. The findings appear to be inconsistent with previous research by non-chemical device manufacturers and some independent researchers on some of the same devices tested in the ASHRAE study. Those other studies reported measurable degrees of biological control within the parameters of testing conducted.
“These results suggest that equipment operators, building owners, and engineers should consider taking more frequent water sample tests for their systems that rely on NCDs for biological control. If the testing shows an issue, one possible measure is to add chemical treatment capability to their system to prevent a potential health hazard from developing until additional research and field testing can resolve this question,” according to Vidic.
The study results are still subject to final approval by the sponsoring technical committee, TC 3.6 – Water Treatment. For notice of when the report is available, please contact Mike Vaughn, manager of research and technical services at ASHRAE.
You might like:
- Technology, Aging Facilities Impacting Education Facility Budgets
- 4 Ways To Avoid LED Lighting Failure
- Question of the Week: How Can I Protect Employees From Zika Virus?
- Facility Management Critical To Infection Control
- VARIDESK Debuts Pro Desk 60 On HBO’s “Silicon Valley”
- Infographic: The Healthcare Speech Privacy Crisis
- Look, Listen, And Learn To Find Leaks
- SkyBEAM UAV From Tremco FAA Approved For Nighttime Operation
- Lunetta Exterior Lighting By Amerlux
- Energy Upgrades And Renovations: What To Know About Windows
- President Obama Proclaims May National Building Safety Month
- Fire Rated Flood Door from PS DOORS
- Spray Kleen Multi-Surface & All-Purpose by Sunburst Chemicals
- DCIM For Facility Management
- York Chiller Mobile App