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TECHNICAL REPORTS
Atmospheric Pollutants and Trace Gases

Odor and Gas Release from Anaerobic Treatment Lagoons for Swine Manure

Animal Sciences Dep., Purdue Univ., West Lafayette, IN 47907

^* Corresponding author (heber{at}purdue.edu)

Received for publication November 20, 2001. Odor and gas release from anaerobic lagoons for treating swine waste affect air quality in neighboring communities but rates of release are not well documented. A buoyant convective flux chamber (BCFC) was used to determine the effect of lagoon loading rate on measured odor and gas releases from two primary lagoons at a simulated wind speed of 1.0 m s^-1. Concentrations of ammonia (NH₃), hydrogen sulfide (H₂S), carbon dioxide (CO₂), sulfur dioxide (SO₂), and nitric oxide (NO) in 50-L air samples were measured. A panel of human subjects, whose sensitivity was verified with a certified reference odorant, evaluated odor concentration, intensity, and hedonic tone. Geometric mean odor concentrations of BCFC inlet and outlet samples and of downwind berm samples were 168 ± 44 (mean ± 95% confidence interval), 262 ± 60, and 114 ± 38 OU_E m^-3 (OU_E, European odor unit, equivalent to 123 µg n-butanol), respectively. The overall geometric mean odor release was 2.3 ± 1.5 OU_E s^-1 m^-2 (1.5 ± 0.9 OU s^-1 m^-2). The live mass specific geometric mean odor release was 13.5 OU_E s^-1 AU^-1 (animal unit = 500 kg live body mass). Overall mean NH₃, H₂S, CO₂ and SO₂ releases were 101 ± 24, 5.7 ± 2.0, 852 ± 307, and 0.5 ± 0.4 µg s^-1 m^-2, respectively. Nitric oxide was not detected. Odor concentrations were directly proportional to H₂S and CO₂ concentrations and odor intensity, and inversely proportional to hedonic tone and SO₂ concentration (P < 0.05). Releases of NH₃, H₂S, and CO₂ were directly proportional (P < 0.05) to volatile solids loading rate (VSLR).

Abbreviations: AU, animal unit • BCFC, buoyant convective flux chamber • BIW, equivalent concentration of n-butanol in water • DT, dilutions to threshold • HT, hedonic tone • OC, odor concentration • OC_E, odor concentration normalized to European odor units • ODC_b, odor detection concentration of n-butanol gas • OU, odor unit • OU_E, European odor unit, equivalent to 123 µg of n-butanol • VSLR, volatile solids loading rate

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