Insights into influences of sucrose amendment on nitrification and denitrification in sewage sludge composting
Insights into influences of sucrose amendment on nitrification and denitrification in sewage sludge composting
复制标题
蔗糖改良剂对污泥堆肥硝化反硝化影响的探讨
DOI：
10.1016/j.chemosphere.2021.130245
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发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Zhang Xiancheng
中科院分区：
文献类型：
--
作者：
Meng Liqiang;Li Weiguang;Zhao Yi;Chen Li;Zhang Shumei;Zhang Xiancheng
在污泥堆肥过程中，添加蔗糖可以促进氨同化，减少氮素损失，但蔗糖对硝化和反硝化的影响尚不清楚。结果表明，添加蔗糖可通过改变土壤理化指标、氮素形态、相关细菌和功能基因等途径降低N2 O排放量33.0%。在蔗糖处理下，硝化细菌群落、amoA和nxrA基因丰度较高，hao、narG、nirS、nirK和norB基因丰度较低。相关性分析表明，硝化细菌数量与NO3-和nxrA丰度呈显著正相关，表明蔗糖添加促进了硝化细菌的生长、NO3-含量和亚硝酸盐氧化活性。NO2−含量与N2 O排放量narG、nirSandnorBabygal呈正相关，表明反硝化作用是N2 O产生的主要途径。
Sucrose amendment could promote ammonia assimilation and reduce nitrogen loss in sewage sludge (SS) composting, but the effects of sucrose amendment on nitrification and denitrification are still unknown that were firstly researched in present paper. Result showed that sucrose amendment reduced 33.0% of N2O emission by changing the physicochemical indexes, nitrogen forms, related bacteria and functional genes. In the sucrose treatment, the higher nitrifying bacteria community,amoA and nxrAgenes abundance were,the lowerhao, narG,nirS,nirKandnorBgenes abundance were. Based on the correlation analysis, the number of nitrifying bacteria was significantly positively correlated with NO3−andnxrAabundance, indicating that sucrose amendment promoted the growth of nitrifying bacteria, the contents of NO3−and the activity of nitrite oxidation. Moreover, contents of NO2−were positively correlated with N2O emission,narG,nirSandnorBabundance, indicating that denitrification was the main path of N2O generated.