Odor control using chemical dosing, coupled with odor monitoring electronic noses on an aeration basin at a WWTP

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Historically the technology to continuously monitor “odors” or odor units in real time has not been available. Since October 2009, the Hampton Roads Sanitation District (HRSD) has been successfully demonstrating new technology that is performing real time odor monitoring of the odors from the uncovered portion of the aeration basin at HRSD's Chesapeake-Elizabeth wastewater treatment plant in Virginia Beach, Virginia.

The odorous emissions from the aeration tanks are measured continuously by a network of three OdoWatch® electronic noses. The network measures the odors continuously at 5-second intervals (dilution to threshold or odor concentration). The real time odor monitoring allows us to know the level of odors from the aeration tanks and potential off-site impacts with and without chemical dosing, instantaneously or historically. Chemical dosing of peroxide and iron is being performed at the raw influent to provide seasonal odor control of the uncovered portion of the aeration basin. The odor monitoring system includes a weather station so as to use dispersion modeling to map the odor plumes from the aeration basin in real time.

Phase I of the Chesapeake-Elizabeth technology demonstration project focused on profiling the uncontrolled odors emitted by the uncovered portion of the aeration tanks from October 2009 thru May 2010. Phase II of the evaluation, June-November 2010, monitored the reduction in those odors by chemical dosing of peroxide and iron and the corresponding odor plumes. Routine field olfactory reality checks of the odor plumes are discussed along with discrete air sampling events of the aeration tanks. The sampling events included odor panel analysis and field H2S measurements.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864712811700219

Publication date: January 1, 2012

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