Control of dimethyl sulfide and dimethyl disulfide odors during pig manure composting using nitrogen amendment. (January 2017) - Zang, Bing
Highlights: Nitrogen electron acceptors were added to composts to reduce sulfur reduction. All the additives significantly reduced dimethyl sulfide and dimethyl disulfide. The reduction was quantified for different additives and doses. The additives had no adverse effects on compost quality. An in situ method was proposed to reduce sulfur odors during composting. Abstract: Effects of nitrogen electron acceptors on dimethyl sulfide (Me2 S) and dimethyl disulfide (Me2 SS) odor emission during composting was investigated. The chemicals and doses used included sodium nitrate (NO3 − at 10 mM, 20 mM and 40 mM), sodium nitrite (NO2 − at 10 mM, 20 mM and 40 mM) and sodium nitrite (10 mM, 20 mM and 40 mM) with hexaammonium heptamolybdate tetrahydrate (HHT). The results showed that the addition of these chemicals restricted the emission of Me2 S and Me2 SS. The emission reduction effect of NO2 − was greater than NO3 − at the same dosage. A greater reduction was observed when HHT was also added. With 2 mM HHT + 40 mM NO2 − addition, the emission of Me2 S and Me2 SS was reduced by 92.3% and 82.3%, respectively. Comparison of compost maturity indices for treated and untreated composts indicated that none of the additives adversely affected compost quality. These results indicate that nitrogen chemical addition may provide an efficient method to control sulfur odors during composting.