不同碳源对污泥堆肥过程腐殖质电子转移能力的影响  

Effect of different carbon-rich amendments on electron transfer capacityof humic substances during sludge composting

作　　者：孙晓杰[1,2,3] 谭知涵 张木喜 王亚搏 欧车权宜 SUN Xiaojie;TAN Zhihan;ZHANG Muxi;WANG Yabo;OU Chequanyi(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541006,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base,Guilin University of Technology,Guilin 541006,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]桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541006 [3]桂林理工大学广西环境污染控制理论与技术重点实验室科教结合科技创新基地,广西桂林541006

出　　处：《桂林理工大学学报》2024年第2期304-312,共9页Journal of Guilin University of Technology

基　　金：广西自然科学基金项目(2018GXNSFGA281001);广西科技重大专项(AA18118013);广西科技计划项目(AD18126018);广西研究生教育创新计划项目(YCSW2022310);广西第五批“特聘专家”专项。

摘　　要：以污水处理厂污泥为主要原料,葡萄糖、蔗糖分别作为外加碳源进行高温堆肥,探讨不同碳源对污泥好氧堆肥过程中腐殖质(HS)的电子转移能力(ETC)的影响。通过电化学方法测定了堆肥不同阶段的HS中胡敏酸(HA)和富里酸(FA)的电子供给能力(EDC)和电子接受能力(EAC),以三维荧光光谱、紫外-可见光谱、傅里叶变换红外光谱等分析方法表征HS的结构和组成变化。结果表明:两个处理HS的EDC、EAC和RER(电子循环率)在堆肥过程中都呈现不断增强的趋势;相比葡萄糖组试验,蔗糖组试验增强了HA和FA的ETC和RER,对HA的EDC和FA的EAC提升效果较好;光谱学分析发现,蔗糖组试验促进了蛋白类物质的降解和类胡敏酸、类富里酸物质的形成,且腐殖化程度、芳香化程度和含氧活性基团含量高于葡萄糖组试验。相关性分析表明,类胡敏酸物质和芳香族物质的增加促进了HA的ETC和RER的增加,而分子量的增大,蛋白质的下降,腐殖化程度的提高,类富里酸和芳香族物质的形成有利于FA中ETC和RER的增强。因此,在选择污泥堆肥的外加碳源时,可通过蔗糖的投加来强化堆肥腐殖质电子转移能力。This paper studies the effect of different carbon sources on the electron transfer capacity(ETC)of humic substances(HS)during high-temperature composting of sewage sludge,using glucose and sucrose as external carbon sources,which are recoreded as CR1 and CR2.The electron donating capacity(EDC)and electron accepting capacity(EAC)of humic acid(HA)and fulvic acid(FA)are determined by electrochemical methods at different composting stages.Additionally,spectroscopic analysis techniques such as three-dimensional fluorescence spectroscopy,UV-visible spectroscopy,and Fourier transform infrared spectroscopy are employed to characterize the structural and compositional changes of HS.The results show that the EDC,EAC and RER of HS in CR1 and CR2 exhibit a continuous increasing trend during composting.Compared with CR1,CR2 has enhanced the ETC and RER of HA and FA,and has a better promotion effect on the EDC of HA and EAC of FA.Spectroscopic analysis reveals that CR2 facilitates the degradation of proteinaceous substances and the formation of humic-like and fulvic-like substances,with higher degrees of humification,aromatization,and oxygen-containing functional groups compared to CR1.Correlation analysis demonstrates that the increase in humic-like substances and aromatic compounds promote the enhancement of ETC and RER of HA.The increase in molecular weight,decrease in protein content,increase in humification degree,and formation of fulvic-like substances and aromatic compounds favor the enhancement of ETC and RER of FA.Therefore,the addition of sucrose can be an effective strategy to enhance the electron transfer capacity of composting humic substances when selecting carbon sources for sewage sludge composting.

关 键 词：堆肥 电子转移能力 胡敏酸 富里酸 三维荧光平行因子分析 

分 类 号：X705[环境科学与工程—环境工程]