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AWWA WQTC69283
- Pilot and Demonstration-Scale Research Evaluation of Under-Ocean Floor Seawater Intake and Discharge
- Conference Proceeding by American Water Works Association, 11/01/2008
- Publisher: AWWA
$12.00$24.00
The Long Beach Water Department (LBWD) is aggressively pursuing seawater desalination as a new source of potablewater for its service area. In addition to testing out the operational feasibility ofvarious desalting membrane technologies, including the patented two-passnanofiltration (NF<sup>2</sup>) process and traditional seawater reverse osmosis, LBWD is alsoresearching other issues which will be important to address prior to commissioning afull-scale production seawater desalination plant. LBWD is pursuing an alternative intake and discharge system, which is based onusing perforated laterals placed under the ocean floor to collect or expel the waterthrough either natural media found on the ocean bed, or alternatively, filter mediaplaced into an excavated area on the ocean floor (ocean floor system). The intakesystem is based on the concept of slow sand filtration (< 1 gallon/min-ft<sup>2M</sup>, (gpm/ ft<sup>2</sup>)),which should mitigate any negative impacts associated with impingement andentrainment due to its slow intake rate. Additionally, the collection of seawaterthrough the filter media may also offer some pretreatment benefits, includingreducing organic and suspended solids. Includes 12 references, tables, figures.
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