SURFACE OXIDATION FOR REDUCING AMMONIA AND HYDROGEN SULFIDE EMISSIONS FROM DAIRY MANURE STORAGE

Abstract

Surface oxidation for reducing ammonia and hydrogen sulfide emissions from dairy manure was studied in alaboratory. Ammonia and hydrogen sulfide emissions from manure storages were measured. Total ammonia, pH,dissolved sulfide concentrations, and chemical oxygen demand of the manure were monitored, and overall mass transfercoefficients of ammonia and hydrogen sulfide were calculated. Spraying 0.5% hydrogen peroxide on the manure surfacenot only steadily reduced 70% of the ammonia emissions, but also significantly reduced the ammonia concentration onthe liquid manure surface. This reduction in ammonia emissions may be partially due to the reduced ammoniaconcentration and partially due to the decreased pH on the manure surface. Spraying 0.5% potassium permanganate onthe manure surface initially reduced ammonia emissions by 70%, but gradually became less effective. Spraying hydrogenperoxide and potassium permanganate on the manure surface also reduced hydrogen sulfide emissions. The results alsoindicated that the overall mass transfer coefficients of ammonia and hydrogen sulfide were not affected by the spraying ofoxidant on the liquid surface. In terms of the effectiveness in reducing ammonia and hydrogen sulfide emissions and theresidue left in the treated manure, hydrogen peroxide was superior to potassium permanganate for this application.