不同C/N比对堆肥腐熟度和含氮气体排放变化的影响

The Impact of Composting with Different C/N on Maturity Variation and Emission of Gas Concluding N

NH3和N2O等含氮气体的排放不仅对堆肥腐熟度和堆肥产品的品质产生影响,同时也与环境污染有直接关系。本研究以猪粪和玉米秸秆为堆肥原料,采用好氧堆肥的方法,探讨了不同C/N比对堆肥腐熟度及NH3和N2O等含氮气体排放变化的影响。结果表明,C/N比为15、20、25和30处理的高温期持续时间分别为2、5、13和12d;C/N比为25处理的堆肥积温最高,达21331℃.h,较C/N比为15、20和30处理的堆肥积温分别提高了89.3%、21.9%和7.14%。堆肥结束时,各处理的全碳降解率以C/N比为25的最大,达24.55%;全氮含量除C/N比15下降了9%之外,其他堆肥处理均较堆制前有明显提高;除C/N比为15堆肥的种子发芽率未达到腐熟外,其他3个处理腐熟度指标均达到要求。氨气累积释放量随C/N比的升高依次降低;各处理N2O的排放量差异不大,堆肥高温期N2O排放通量最大,随着堆肥的进行,排放量逐渐减少。

NH3 and N2O influence not only on the maturity and quality of composting products, but also on the surrounding environment during composting. Based on aerobic composting, the impact of composting with different C/N on maturity variation and emission of gas concluding N was studied in pig manure and composting. Results indicated that the duration time of C/N ratio which was 15, 20, 25 and 30 respectively were 2, 5, 13 and 12 days during the high composting temperature, the accumulated temperature of the C/N ratio 25 reached to 21 331℃. h which was the highest. By the end of eomposting, the total carbon of the disposals with C/N ratio 25 reached to 24.55% which was the biggest. The total nitrogen with C/N ratio 15 was decreased 9%, the others were obviously improved. The cumulative volatilization of NH3 decreased due to the accretion of the C/N ratio. The flux of N2O were the biggest during the high composting temperature. The flux of N2O gradually diminished with the composting process.