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An improved methodology for quantifying odor dilution-to-threshold (D/T) levels from environmental emission sources using field olfactometry has been developed, using multiple assessors. The method, pioneered at the Penn State Odor Assessment Laboratory for evaluation
of manure odor emissions, is appropriate for high value decision making where documentation of existing malodor D/T levels and alternative mitigation measures are considered. This study describes application of the technique at the Philadelphia Biosolids Recycling Center (BRC) to benchmark
odor emissions under current operating conditions, and identify perimeter locations especially vulnerable for off-site odor complaints. Nasal Ranger® field olfactometer (FO) instruments were used to collect D/T observations at 13 inside-the-fence locations during four
odor survey events in late July 2008. Quantitative FO measurements were complimented with odor quality observations: character, supra-threshold intensity, and hedonic tone. Subjective odor intensity and hedonic tone very highly correlated (r=0.99) with log10 Best Estimate Threshold
odor concentrations. The primary malodor source was determined to be the biosolids stockpile storage area. Less significant malodor sources included: the transport truck conveyor-loading area, debris/ puddles along fence lines, and storm water collection/ detention facilities. Improved housekeeping
and relocation of dewatered biosolids storage facilities were suggested to reduce the potential for off-site nuisance odor complaints.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.