Geomembrane Technologies Inc. (GTI)

Utility reduces DBPs while controlling algae growth - case study


Courtesy of Courtesy of Geomembrane Technologies Inc. (GTI)

In the fall of 2004, the Operations Division of the Santa Clara Valley Water District (the District) started a program called the Operations Council on Excellence. The program was created to support the District’s vision of a cleaner, greener, and leaner operation. At the time, two of the District’s three water treatment plants, Penitencia and Santa Teresa, were undergoing construction to replace chlorine with ozone for primary disinfection. With the switchover to ozone, the plan was to reduce or eliminate chlorine feed at the head of the plant, thus reducing the formation of disinfection by-products (DBPs). The challenge was that any attempts in the past to reduce chlorine feed resulted in algal growth on the basins walls, launders, tube settlers, etc. At times, algal growth was significant enough to have caused in-plant taste and odor production.

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