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ODOR CONTROL OF WATER REUSE RESIDUALS DISCHARGED TO A SANITARY SEWER

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In many parts of the world, water scarcity is prompting communities to explore water reuse as a supplement to limited water supplies. However, the residuals generated by many water reuse treatment processes create several new challenges.

The City of Las Vegas has recently constructed a facility to treat sanitary wastewater, use the processed water effluent. This plant, the Northwest Water Resource Center (WRC), is designed to treat a maximum flow of 10 MGD. The resulting effluent will be used for local irrigation purposes while the residuals generated during treatment will be discharged into the wastewater collection system (WCS) and conveyed approximately 19 miles to the City's Water Pollution Control Facility. At design capacity, it has been estimated that residual discharge will be approximately 1 MGD with anticipated BOD5 loadings of approximately 2,400 mg/L.

Due to concerns regarding increased WCS BOD loadings associated with WRC residual discharge and potential resultant increases in odor and/or corrosion within the collection system, modeling was performed. CH2M HILL's INTERCEPTOR Model was used prior to WRC start-up to predict increases in odor and corrosion potential resulting from WRC operation. Use of the INTERCEPTOR Model allowed the City of Las Vegas to proactively plan for potential odor problems that might arise as a result of introduction of WRC residuals into the WCS. Model results were used to (1) identify potential WCS odor “hot spots”, (2) quantify the increase in sulfide concentrations within the system, and (3) determine the extent of liquid-phase chemical control required to reduce sulfide concentrations to acceptable levels

This paper will present the results of the sewer modeling efforts to assess the impact of the residuals on the sanitary sewer system and downstream WPCF. The increased odor potential, and liquid-phase chemical control alternatives and associated annual chemical cost data will be presented. It is anticipated that this presentation will be of interest to anyone involved with odor control and design, operation, and/or maintenance of wastewater collection systems.
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Document Type: Research Article

Publication date: 2002-01-01

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