… Last month the International Boundary and Water Commission, which oversees a wastewater treatment facility along the U.S.-Mexico border, awarded Ohio-based Greenwater Services an estimated $2.5 million to test their “nanobubble technology” method to capture contaminants in the Tijuana River. The process involves pumping ozone bubbles into water. … However, according to the IBWC’s own project description, deploying this method on the Tijuana River has yet to be tested. Scientists, local leaders and environmental advocates are concerned that the project has been given a greenlight by the IBWC despite a lack of data on its effectiveness or risks. 

Other water treatment news:

• inewsource (San Diego): San Diego County approves Tijuana River sewage measures, moves to eliminate toxic hotspot
• Government Technology: California utility district uses black light for water quality
• KTAR (Phoenix, Ariz.): How human-made Tres Rios Wetlands fits into Valley’s wastewater recycling process​