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The upgraded El Toro Water District Water Recycling Plant (ETWRP), located in Orange County, California, started operation in June 1997 at 4.6 mgd. The plant includes odorcontrolled influent wastewater equalization basins and aeration basins partitioned for aerobic selector operation. The plant was initially operated under non-nitrifying conditions, at a low Solids Retention Time (SRT) averaging 1.2 days. Thereafter, operation was changed to nitrifying mode at an average SRT of 3.8 days.

A comparison of operating conditions after changing from non-nitrifying to nitrifying mode shows improved effluent BOD/TSS quality, increased air demand (from 580 to 830 standard cubic feet of air per lb BOD) and decreased waste sludge production (from 1.22 to 0.81 lb/lb BOD).

Since the El Toro Water District transports its waste sludge to a regional facility and incurs costs for further stabilization and disposal, the cost saving in reduced sludge production in this case outweighs the additional power costs due to increased air consumption.
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Document Type: Research Article

Publication date: 01 January 2000

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