EFFECT OF BIOLOGICAL NITRIFICATION INHIBITOR ON NITROGEN FIXATION AND EMISSION REDUCTION IN STRAW AND DAIRY MANURE COMPOSTING

The purpose of this study was to analyze the effect of biological nitrification inhibitor MHPP on nitrogen fixation and emission reduction for straw and dairy manure composting. During the period from May to September in China, the engineering large-scale composting was performed with dark box sampling was conducted to take composting gas sample which was studied gas chromatography. The result indicated that, in relation to the control, to which no MHPP extract solution was added, the addition of 0.2%, 0.4%, 0.6% and 0.8% MHPP extract solutions reduced the methane emission by 44.52%, 56.56%, 61.93%, 59.59%, the N2O emission by 36.24%, 39.49%, 62.39 and 55.81%, and the NH3 emission by 23.72%, 65.61%, 65.40% and 72.61%; after the addition of biological nitrification inhibitor, the composting process slowed down; the ammonium nitrogen content was high while the nitrate nitrogen content was low; all substances thoroughly decomposed in the end. Moreover, the final ammonium nitrogen content was higher in all cases when compared to the control. The results showed that the addition of 0.6% MHPP extract solution worked the best for nitrogen fixation and emission reduction and thus is appropriate to be used extensively in production activities.