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LARGE DIAMETER SEWER VENTILATION DYNAMICS REQUIRE A THREE MILE-LONG ODOR CONTROL DUCT IN LAS VEGAS

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Abstract:

Faced with an ever-increasing population in Las Vegas, the Clark County Sanitation District (CCSD) began the design and construction of the Crosstown Interceptor in 1995. This large diameter sewer ranges in size from 1.5 m to 2.2 m in diameter (60-in to 84-in) and collects wastewater from over 9 miles away from the treatment plant. The sewer relieves existing smaller diameter sewers in the Las Vegas Valley and increases the total wastewater conveyance capabilities of the District. Wastewater will be conveyed to the existing Clark County Advanced wastewater treatment plant on Flamingo Road. Figure 1 is a site map of the lower Crosstown Interceptor and the project site. Under a phased implementation program, which included capacity upgrades to the treatment plant, the downstream reaches of the 2.2-meter (84-inch diameter) sewer were designed in 1998 and construction began in mid-1999. The topography of the Las Vegas Valley and the connection of the 2.2 m (84-inch) diameter tunnel to an existing smaller 1.75 m (69-inch) diameter sewer as the final conveyance to the treatment plant required a long inverted siphon configuration. Under peak design flow conditions the sewer would begin to surcharge near the busy intersection of East Desert Inn Road and South Nellis Boulevard on the east side of town. The CCSD realized that inverted siphons are classic odor release sites and wanted to assure that the new Crosstown Interceptor would not cause odor problems upon start-up.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864700785303349

Publication date: 2000-01-01

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