油橄榄果渣部分替代锯末糠壳对猪粪污异位发酵的影响

Effects of partial replacement of sawdust and bran by olive pomace on ectopic fermentation of swine manure

  • 摘要: 【目的】评价油橄榄果渣部分替代传统锯末糠壳垫料和使用功能菌剂进行异位发酵的发酵效果,为猪粪污异位发酵生产和农业废弃物资源化利用提供参考。【方法】试验设6个不同垫料组合和微生物菌剂处理,将不同垫料组合和菌剂与猪粪污充分混合进行堆肥发酵,发酵第0、5、10、15和20 d采样,测定各处理温度、水分、pH、电导率和氮、磷、钾含量及微生物多样性,对比分析各处理物理化学指标和微生物群落变化差异,评价添加油橄榄果渣和功能菌剂的发酵效果。【结果】添加油橄榄果渣和功能菌剂能提高异位发酵温度和高温维持时间,各组pH均呈升高趋势,而含水率和EC值均先升高后降低。0~20 d发酵过程中,各处理组有机碳、氮、磷和钾含量变化趋势存在差异;与发酵0 d相比,发酵第20 d时有机碳含量显著降低(P<0.05,下同);全氮含量显著升高;功能菌剂组的全磷含量在发酵前后无显著差异(P>0.05);全钾含量均显著降低,以45%锯末+30%糠壳+25%油橄榄果渣+功能菌剂组的全钾含量最高(9.43g/kg)。添加油橄榄果渣能降低发酵垫料中的硝态氮含量,同时添加油橄榄果渣和功能菌剂能提高异位发酵垫料的铵态氮含量。发酵过程中,功能菌剂组在目和属水平上芽孢杆菌等优势菌的相对丰度增加,添加油橄榄果渣可提高细菌氨基酸、碳水化合物和脂类代谢相关基因的拷贝数。【结论】油橄榄果渣可部分替代锯末糠壳垫料,垫料配比45%锯末+30%糠壳+25%油橄榄果渣配合使用功能菌剂更有利于发酵床垫料的腐熟和有机肥形成。

     

    Abstract: 【Objective】This research evaluated the fermentation effect of olive pomace partially replacing traditional mattress materials made by sawdust and bran and using functional microbial inoculum for ectopic fermentation,so as to provide reference for swine manure ectopic fermentation and the resource utilization of agricultural waste.【Method】Six different combinations of mattress materials and microbial inoculum were used in the experiment. The different combinations of mattress materials and microbial inoculum were thoroughly mixed with swine manure for composting and fermentation. Samples were taken on the day 0, 5, 10, 15, and 20 of fermentation to measure temperature,moisture,pH,conductivity, nitrogen content, phosphorus content, potassium content, and microbial diversity of each treatment. The differences in physical and chemical indicators and microbial community changes of each treatment were compared and analyzed to evaluate the fermentation effect of adding olive pomace and microbial inoculum.【Result】The addition of olive pomace and microbial inoculum could increase the temperature of ectopic fermentation and the duration of high temperature. The pH value of each group increased,while the water content and EC value increased first and then decreased. During the 0-20 day fermentation process,there were differences in the trend of changes in organic carbon,nitrogen,phosphorus, and potassium contents among different treatment groups. Compared with the day 0 of fermentation,the organic carbon content significantly decreased on day 20 of fermentation(P<0.05,the same below). The total nitrogen content significantly increased. The total phosphorus content of the group adding microbial inoculum showed no significant difference before and after fermentation(P>0.05). The total potassium content was significantly reduced,and the total potassium content in the group of 45% sawdust+30% bran+25% olive pomace +functional microbial inoculum was the highest(9.43 g/kg). The addition of olive pomace could reduce the nitrate nitrogen content in the fermentation mattress material,while the addition of olive pomace and functional microbial inoculum could increase the ammonium nitrogen content in the ectopic fermentation mattress material. During fermentation,the abundance of dominant bacteria such as Bacillus at the order and genus levels in the group adding microbial inoculum increased,and the addition of olive pomace could increase the copy number of metabolism-related genes of amino acid,carbohydrate and lipid in bacteria.【Conclusion】 Olive pomace can partially replace the sawdust and bran mattress material,and the composition of 45% sawdust+30% bran+25% olive pomace combined with functional microbial inoculum is more conducive to the decomposition of fermentation mattress and the formation of organic fertilizer.

     

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