Laboratory, semi-pilot and room scale study of nitrite and molybdate mediated control of H₂S emission from swine manure
2010
Moreno, Lyman | Predicala, Bernardo | Nemati, Mehdi
The effects of manure age on emission of H₂S and required level of nitrite or molybdate to control these emissions were investigated in the present work. Molybdate mediated control of H₂S emission was also studied in semi-pilot scale open systems, and in specifically designed chambers which simulated swine production rooms. With fresh 1-, 3- and 6-month old manures average H₂S concentration in the headspace gas of the closed systems were 4856±460, 3431±208, 1037±98ppm and non-detectable, respectively. Moreover, the level of nitrite or molybdate required to control the emission of H₂S decreased as manure age increased. In the semi-pilot scale open system and chambers, average H₂S concentration at the surface of agitated fresh manure were 831±26 and 88.4±5.7ppm, respectively. Furthermore, 0.1-0.25mM molybdate was sufficient to control the emission of H₂S. A cost study for an average size swine operation showed that the cost of treatment with molybdate was less than 1% of the overall production cost for each market hog.
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