初始pH值对畜禽粪便和菌渣混合高温堆肥的影响

以猪粪和菌渣为主要原料,过磷酸钙和石灰作为pH调节剂,设计8个不同pH值的堆肥处理,研究堆肥初始pH值与堆肥腐熟进程及理化性状的关系。结果表明,在本试验条件下,随着堆肥初始pH值的提高,堆肥升温速率、最高温度和有机物降解率均上升。然而,pH值的提高导致堆肥中NH4+-N的积累量下降,堆肥产品中氮素损失上升。综合考虑堆肥效率和产品质量等因素,建议畜禽粪便堆肥中添加石灰量不要超过堆料鲜质量的0.6%或添加过磷酸钙量不要超过堆料鲜质量的5.2%。堆肥初始pH值在6.42~6.83之间有利于减少氮素损失和提高堆肥效率。

Effects of initial pH values on maturity and nitrogen loss during co-composting of pig manure and edible fungus residue

In order to evaluate the effect of initial pH on maturity and nitrogen loss during co-composting with pig manure and edible fungus residue, 8 co-composting treatments of varied initial pH values were designed, with lime and calcium superphosphate as acid-base additives. It was shown that the heating rate and decomposition rate of organic matter increased with the elevated initial pH. However, the elevated initial pH decreased NH4+-N accumulation, and induced higher N loss during composting. In conclusion, it was suggested that any attempt to shorten the composting period and simultaneously improve the quality of compost, the initial pH should be controlled within 6.42-6.83 for co-composting of pig manure and edible fungus residue. The quantity of amended lime or calcium superphosphate for pH adjusting should be no more than 0.6% or 5.2%, respectively, of the fresh weight of composting mixture.