Durability test results of construction and process materials exposed to liquid and gas phase ozone

The Metropolitan Water District of Southern California performed a study to evaluate materials of construction for use in ozone contactor construction. The concept reactor is a baffled box conduit constructed of concrete with metallic valves, slide gates, etc. for flow control and metallic piping for ozone gas distribution and off-gas collection. The study concluded that ozone by itself has no impact on standard type 2/type 5 concrete and that pozzalonic admixtures could enhance the structural design. Metals exposed to ozone should be constrained to the austenitic grades of stainless steel. Plastics should be limited in their application, elastomers should be limited to Viton-A and EPDM, and none of the elastomers, protective coatings, structural adhesives or joint sealants tested show promise in long term performance.