Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Air emissions from animal feeding operations (AFOs) such as ammonia (NH3), hydrogen sulfide (H2S), and greenhouse gases (GHGs) impact air quality. Studies indicate that tannins bind protein, inhibit enzyme activity, and reduce bacteria numbers. A laboratory scale study was conducted for a 25-d period evaluating the effect of treating simulated stored steer manure with 0.5% (g/g of manure) of condensed tannin (CT) extracts from chestnut (C), quebracho (Q), tara (T), and a control (Cont) on air emission reductions. Results over a 25-day period showed mixed implications. Average daily NH3 concentrations from C treatment showed a reduction of 25.9% compared to control. Reductions of H2S emissions by 96.2 and 21.33% respectively, were noted from Q and T treatments when compared to Cont (P <0.01). When CH4 emissions were compared to Cont group, emissions were reduced by 25.2, 66.3, and 20.0% from C, Q, and T groups, respectively (P <0.01). Treating steer manure with Q proved to be the most effective tannin to mitigate air emissions.