Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China.
Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, China.
Bioresour Technol. 2019 Jan;272:433-441. doi: 10.1016/j.biortech.2018.10.044. Epub 2018 Oct 21.
This study reported for the first time that hyperthermophilic composting (HTC) could mitigate 90% of the cumulative amount of NO emissions compared to traditional composting (TC) in a full-scale experiment. The concentrations of NO-N and NO-N in HTC were significantly lower than those in TC, which may be the main reason for the reduced NO emissions. Furthermore, this study found that the decrease in NO emissions in HTC compared to TC was mainly due to the inhibition of the abundance of the bacterial amoA and norB genes, which could decrease the nitrification rate and control NO formation, respectively. Partial least squares path modeling revealed that a high temperature was the key factor in lowering NO emissions in HTC, while physicochemical properties were the dominant factor in enhancing NO emissions in TC. These results suggested that HTC is a promising technique for reducing NO emissions in manure composting.
本研究在全规模实验中首次报道，与传统堆肥（TC）相比，高温堆肥（HTC）可将 NO 排放的累积量减少 90%。HTC 中的 NO-N 和 NO-N 浓度明显低于 TC，这可能是 NO 排放减少的主要原因。此外，本研究发现，与 TC 相比，HTC 中 NO 排放的减少主要归因于细菌 amoA 和 norB 基因丰度的抑制，这分别可以降低硝化速率和控制 NO 的形成。偏最小二乘路径模型显示，高温是 HTC 降低 NO 排放的关键因素，而理化性质是 TC 中增强 NO 排放的主要因素。这些结果表明，HTC 是减少粪便堆肥中 NO 排放的一种很有前景的技术。
