不同碳氮比下牛粪高温堆肥腐熟进程研究

发布时间：2018-03-03 19:20

  本文选题：牛粪　切入点：碳氮比　出处：《土壤通报》2017年03期 　论文类型：期刊论文

【摘要】：为有效处理奶牛场养殖粪污,建立以之为原料的牛粪有机肥高效堆肥工艺,本文通过工厂堆肥试验,以牛粪为主料,以蘑菇渣、稻壳为辅料,设置C/N=15、C/N=25、C/N=35三个处理,研究不同碳氮比原料高温堆肥过程中堆体温度、pH值、EC、C/N和养分等理化指标的变化。结果表明,C/N=25堆体达到的温度最高,达到最高温度所需时间最短且保持65℃以上时间最长。堆肥过程中各处理pH值变化基本一致,均是先升高后降低再升高最后趋于稳定,各处理EC都是先波动上升后在波动中逐渐下降并趋于稳定。各处理堆体在堆肥过程中,C/N也都呈现逐步减小的趋势,并最终保持稳定。至堆肥结束时,各处理C/N分别11.7、15.0和21.3。各处理铵态氮含量逐渐下降,硝态氮含量逐渐增加,至堆肥结束时,铵态氮的损失量分别为80.7%、36.6%和46.7%,硝态氮含量分别增加到0.61 g kg~(-1)、0.50 g kg~(-1)、0.41 g kg~(-1)。堆肥结束时,各处理胡敏酸类、富里酸类等物质成为DOM的主体部分,N1、N3处理发芽指数大于50%但小于85%,N2处理发芽指数大于85%。各处理堆肥全磷、全钾含量在堆肥结束时比堆肥初始均有所增加。因此,牛粪高温堆肥能有效处理奶牛场养殖废弃物,且C/N=25时堆肥效果最佳。
[Abstract]:In order to deal with dairy-raising manure effectively, and to establish an efficient composting process of cow manure organic manure as raw material, this paper, through composting experiment in factory, took cow dung as main material, mushroom dregs and rice husk as auxiliary materials, and set up three treatments, C / N ~ (15) C / N _ (15) C / N ~ (25) C / N ~ (3 +) ~ (35). The changes of physical and chemical indexes such as pH value, ECC / N and nutrients during composting at high temperature with different C / N ratios were studied. The results showed that the temperature of C / N / N 25 reactor reached the highest. It takes the shortest time to reach the highest temperature and the longest time to keep above 65 鈩，

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