2003-063 - Laserfiche WebLink

Home Browse Search

ODOR CONTROL STUDY Representative samples were taken from point and area sources . Laboratory and field analyses of the samples were performed to identify the odorous compounds found in the emissions . Mass odor emission rates were then calculated for each treatment process . An USEPA validated flux-chamber was used to collect samples from the following area sources : • Anoxic Tank Pre-Oxygen Zone in Oxidation Ditch ( prior to aerators ) Mixed -Aerated Zone in Oxidation Ditch (after aerators ) Sludge Storage Basins • Septage Storage Tanks • Filtrate Sump Samples were also taken and analyzed for several point sources , including : • Headworks Scrubber ( inlet and outlet) • Combined Sludge Storage Duct (duct from Sludge and Septage Storage Tanks to the RSF -Scrubber) • RSF Scrubber -( inlet and outlet) Figure 1 provides an overview of the facilities that were included in the mass odor emissions inventory for the Central WWTF. 2 . 1 Air Emission Testing Methodologies Emissions from Wastewater Treatment Facilities and sludge processing facilities typically contain high amounts of H2S and organic sulfur compounds . These compounds are known to be highly odorous at low concentrations . Table 1 shows that these compounds can be detected by the human olfactory system at less than part per billion by volume ( ppbv) concentrations . Thus , H2S and organic sulfur compounds were the primary odorous compounds measured during the sampling program . H2S concentrations were measured at the plant using a Jerome 631X H2S detector and colorimetric sorption tubes . In addition , samples from all of the area and point sources were analyzed on -site for organic sulfur compounds using a field portable gas chromatography/mass spectrometry (GC/MS ) unit. Samples were also collected in preconditioned Tedlar gas sampling bags and sent to a laboratory for olfactory analysis . Additional information on the testing methodologies used to measure odor emissions from the Central WWTF is provided below: • A Jerome Model 631X total sulfide analyzer was used for real-time measurement of all sulfur compounds , in terms of H2S concentrations . The meter is quantitatively calibrated for H2S . However, organic sulfur compounds are also measured by the analyzer, but at fractional proportions . .� 3 Indian River County, Central Wastewater Treatment Facility J PBSU #071230, February 2003