摘要
腐殖质广泛存在于人工湿地等环境中,研究典型腐殖质(腐殖酸、富里酸)对人工湿地反硝化性能的影响,对人工湿地脱氮性能的强化有重要意义。文章通过傅里叶变换红外光谱技术对2种腐殖质进行表征,测试腐殖质不同浓度(0 mg/L;FA=1、25 mg/L;HA=1、10 mg/L)影响下典型周期内NO_(3)-N、NO_(2)--N、TN随时间的变化规律,结合微生物群落组成,阐明腐殖质对人工湿地反硝化性能的贡献。结果表明,FA、HA均含有醌基,且FA中C=O、C=C特征峰面积大于HA;水质的时间沿程规律结果表明,FA、HA可显著提升NO_(3)--N去除率,且TN去除率顺序为FA-1>HA-10>HA-1>FA-25>CG;微生物结果表明,加入FA、HA后,反硝化优势菌门变形菌门Proteobacteria与优势菌属陶厄氏菌属Thauera相对丰度均有所提升,结合FAPROTAX功能预测结果显示出更强的脱氮潜能。
Humus is widely present in constructed wetlands and other environments.The study of the influence of typical humus(humic acid,fulvic acid)on the denitrification performance of constructed wetlands is of great significance to the enhancement of the denitrification performance of constructed wetlands.The two kinds of humus was characterized by Fourier transform infrared spectroscopy,to test the change laws of NO_(2)-N,NO_(2)-N,TN over time in a typical cycle under the influence of different concentrations of humus(0 mg/L;FA=1,25 mg/L;HA=1,10 mg/L).Combined with the composition of microbial communities,the contribution of humus to the denitrification performance of constructed wetlands was clarified.The results show that both FA and HA contain quiNO_(3)ne groups,and the area of the characteristic peaks of C=O and C=C in FA is larger than that of HA.The time course of water quality results show that FA and HA can significantly increase the removal rate of NO_(3)-N,and the order of TN removal rate is FA-1>HA-10>HA-1>FA-25>CG.The microbial results show that after adding FA and HA,the relative abundance of denitrification dominant bacteria phylum of Proteobacteria and dominant bacteria of the genus Thaurea has been increased,and the prediction results of the FAPROTAX function show stronger denitrification potential.
作者
孙晓辉
翟文风
蔡然
李德祥
宋忱馨
游宇
郭富成
陈一
SUN Xiaohui;ZHAI Wenfeng;CAI Ran;LI Dexiang;SONG Chenxin;YOU Yu;GUO Fucheng;CHEN Yi(College of Environment and Ecology,Chongqing University,Chongqing 400045,China;Sichuan Shuihui Ecological Environment Management Co.,Ltd.,Nejiang 641000,China;Bejing Capital Co.,Ltd.,Bejing 10000,China;Bejing Mercury Environment Co.,Ltd.,Bejing 100000,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第5期53-59,共7页
Environmental Science & Technology
基金
重庆市青年拔尖人才(CQY201905062)。
关键词
人工湿地
腐殖质
反硝化
电子传递
constructed wetland
humus
denitrification
electron transfer
