Department of Agricultural, Food and Environmental Sciences, Università Politecnica delle Marche, 60131 Ancona, Italy.
Department of Agricultural, Food and Environmental Sciences, Università Politecnica delle Marche, 60131 Ancona, Italy.
Bioresour Technol. 2021 Oct;338:125550. doi: 10.1016/j.biortech.2021.125550. Epub 2021 Jul 13.
The current study evaluated the quality of agricultural waste digestate by composting or co-composting with biogas feedstock (maize silage, food processing waste, or poultry litter). Temperature, phytotoxicity, C/N ratio, water extractable trace elements, and 14 enzyme activities were monitored. Temperature dropped earlier in digestate and maize silage co-composting pile, reducing time to maturity by 20 days. Composting and co-composting reduced phytotoxicity and C/N ratio, but increased immobilization of Al, Ba, Fe, Zn, and Mn at least by 40% in all piles. All the enzyme activities, except arylsulfatase and α-glucosidase, increased at the maturity phase and negatively correlated with organic matter content and most of trace elements. Post-digestate composting or co-composting with biogas feedstock is a promising strategy to improve digestate quality for fertilizer use, and selected enzyme activities can be indicators of compost maturity and immobilization of trace elements.
本研究通过堆肥或与沼气原料（玉米青贮、食品加工废物或家禽粪便）共堆肥来评估农业废物消化物的质量。监测了温度、植物毒性、C/N 比、水可提取微量元素和 14 种酶活性。在消化物和玉米青贮共堆肥堆中，温度较早下降，使成熟时间缩短了 20 天。堆肥和共堆肥降低了植物毒性和 C/N 比，但在所有堆肥中，至少有 40%的 Al、Ba、Fe、Zn 和 Mn 被固定。除了芳基硫酸酯酶和α-葡萄糖苷酶外，所有酶活性在成熟阶段均增加，与有机质含量和大多数微量元素呈负相关。沼气原料的消化后堆肥或共堆肥是一种很有前途的策略，可以改善消化物质量，使其更适合用作肥料，并且可以选择一些酶活性作为堆肥成熟和微量元素固定的指标。
