温度和pH值对低木质素碎木反硝化过程的影响  

Effects of Temperature and pH on Denitrification Process on Woodchips with Low Lignin Content

作　　者：李鑫[1,2] 胡荣庭 陈广林 李玉昕 杨家乐 LI Xin;HU Rongting;CHEN Guanglin;LI Yuxin;YANG Jiale(Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control,Guilin University of Technology,Guilin 541006,China;Guangxi Engineering Research Center of Comprehensive Treatment for Agricultural Non-point Source Pollution,Guilin 541006,China;Guangxi Electric Power Design Institute Co.,Ltd.,China Energy Engineering Group,Nanning 530000,China)

机构地区：[1]桂林理工大学广西环境污染控制理论与技术重点实验室,广西桂林541006 [2]广西农业面源污染综合治理工程研究中心,广西桂林541006 [3]中国能源建设集团广西电力设计院有限公司,广西南宁530000

出　　处：《环境科学与技术》2024年第1期102-110,共9页Environmental Science & Technology

基　　金：国家自然科学基金地区项目(42367027);广西科技基地和人才专项(桂科AD19110083);桂林理工大学科研启动基金(GUTQDJJ2018067)。

摘　　要：木质生物质作为广泛研究的碳源材料,突出问题是反硝化速率缓慢和副产物较多。为此,该文采用碱处理后的低木质素含量碎木作为原料,将反硝化过程细分为碳释放和反硝化阶段,设计温度和pH值的影响因素试验,测定“三氮”、总氮和溶解性有机物(DOC)浓度,以及DOC的光谱特征。结果表明:碳释放和反硝化对温度变化的敏感程度不同,二者的速率在15℃条件下分别为2.6和1.1mg/(g·d),在25℃时分别升高至1.7倍和1.5倍,而在35℃时又分别升高至25℃的1.7和2.1倍;碳释放在pH值5.0和9.0时均受到抑制,而反硝化在pH值9.0条件下明显减弱;亚硝态氮在15℃条件下的峰值最高,占硝态氮去除量的35.7%,而占比值最大的是pH值为9.0的条件;反硝化期间残留DOC占释碳总量的44.6%~52.0%,包括类蛋白和类腐殖酸。As a widely studied carbon source material,the outstanding problems of woody biomass are slow denitrification rate and more by-products.Therefore,the denitrification process was subdivided into carbon release and denitrification stages by using alkali treated wood with low lignin content as raw materials.Experiments were designed to determine the concentra-tion of“trinitrogen”,total nitrogen and dissolved organic matter(DOC),and the spectral characteristics of DOC.The results showed that the sensitivity of carbon release and denitrification to temperature change was different,while the rates of carbon release and denitrification were 2.6 and 1.1 mg/(g.d)at 15 C,respectively,which increased to 1.7 times and 1.5 times at 25 C,and 1.7 times and 2.1 times at 35 C.Carbon release was inhibited at pH 5.0 and 9.0,while denitrification was obviously weakened at pH 9.0.The peak value of nitrite nitrogen was the highest at 15 C,accounting for 35.7%of nitrate nitrogen removal,and the maximum ratio was at pH 9.0.During denitrification,the residual DOC accounts for 44.6%~52.0%of the total carbon released,including proteinoid and humic acidoid.

关 键 词：木质生物质 碳源 反硝化 影响因素 副产物 

分 类 号：X703[环境科学与工程—环境工程]