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Improved Operating Conditions for L.A.'s Future Indirect Potable Reuse Facility

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In an effort to maximize the use of recycled water, the Los Angeles Department of Water and Power (LADWP) will be implementing indirect potable reuse for its Donald C. Tillman Water Reclamation Plant. The facility will utilize advanced water treatment (AWT) processes, consisting of microfiltration (MF), reverse osmosis (RO), and advanced oxidation to produce potable quality water for groundwater recharge. LADWP has conducted 16 months of pilot testing in order to optimize operating conditions and evaluate alternative processes.

This paper discusses results of pilot testing used to evaluate potential improvements to the standard advanced treatment facility operating conditions, including:

The use of secondary effluent instead of the tertiary effluent as AWT feed water

The use of sequential chlorination instead of the traditional chloramination ahed of the MF and RO membranes

The use of a 14 gallon per day per square foot (gfd) flux instead of the standard 12 gfd for the RO membranes.

Results of the pilot testing are discussed, along with the implications for design of the future AWT facility.
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Keywords: NDMA; chloramination; disinfection byproducts; flux; potable reuse; reverse osmosis

Document Type: Research Article

Publication date: 2011-01-01

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