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Las Vegas Strip Odor Remediation

Las Vegas Boulevard is a world renowned travel destination in the heart of our city. One of a kind tourist attractions dot the landscape along the strip: from the carnival rides high atop the Stratosphere to the beautiful Bellagio fountains, from breathtaking Cirque du Soleil shows to the Fremont Street Experience, Las Vegas is a place that people come expecting to be " wowed, " and the city wants to provide that experience. For the most part, the city delivers and people leave with a good overall impression, but there are some areas that could be improved upon. The unprecedented growth of the Las Vegas Strip in the last decade has resulted in some engineering challenges, including the control of odors in the sewer lines. The odor is mainly caused by hydrogen sulfide emissions, which is unpleasant and can also promote sewer corrosion and cause explosions. In Las Vegas, mainly during summer, unpleasant odors escape from the sewer system in parts of the city, with one of the most notable locations being at the intersection of Las Vegas Blvd with Flamingo Rd, right at the heart of the Las Vegas Strip. This is a byproduct of biological processes that occur in the wastewater as it flows through the sewer system toward the wastewater treatment plant. The project described in this report looks at four alternatives to eliminate this odor issue: biofiltration, Granulated Activated Carbon (GAC) filtration, nitrate addition and the alternative of doing nothing. Each alternative was evaluated based on effectiveness, land usage, energy consumption, water and material usage, and cost. Cost was further broken down into initial costs and annual costs, and then a cash flow analysis was performed to evaluate the cost over a 30 year timeframe. Nitrate had the smallest land, energy and water footprints while GAC had the smallest material usage. Effectiveness of all three technologies was sufficient to eliminate it as one of the criteria for evaluation. and $10,957 respectively. Through the use of the cash flow analysis, it was determined that over the 30 year timeframe evaluated, biofiltration ($335,000) was significantly less than either nitrate addition ($779,000) or GAC ($810,000). From a strict odor control perspective, biofiltration proved to be an ideal design for the Las Vegas Strip. Not only does the system provide a more aesthetically acceptable design, but it remediates the problem at a significantly lower price. Sewer systems are one part …