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Olivenhain Municipal Water District/CH2M Hill, California
Bench-Scale Testing of Treatment Alternatives for T&O and
DBP Control

 


 

The Olivenhain Municipal Water District operates a 34 MGD membrane filtration plant in San Diego County, California. The plant treats water from Olivenhain Reservoir, a water with low organic content. A regional power generation project was going to mix water from Lake Hodges with that from Olivenhain Reservoir. Lake Hodges water is high in natural organic matter and other contaminants, including various taste-and-odor (T&O) chemicals caused by algal growth in the lake. During turn-over events, the lake also experiences significant increases in manganese levels in the water. Through a contract with CH2M Hill, WQTS conducted a number of bench-scale tests to evaluate alternative options to remove T&O and manganese from the water, and control the formation of disinfection by-products under various water blends from Olivenhain Reservoir and Lake Hodges. WQTS' work focused primarily on the use of different types and doses of powdered activated carbon (PAC) for T&O removal, and the use of permanganate oxidation with coagulation to remove elevated levels of manganese. DBP formation under various chemical treatment scenarios was also evaluated.

 
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