生活垃圾填埋富里酸电子转移能力与影响因素  

Electron transfer capacity of fulvic acid and its factors during municipal solid waste landfill

作　　者：肖骁[1,2] 何小松[1,2] 席北斗[1,2] 熊善高[3] 李丹[1,2] 张慧[1,2] 耿春茂 袁志业 XIAO Xiao;HE Xiaosong;XI Beidou;XIONG Shan＇gao;LI Dan;ZHANG Hui;GENG Chunmao;YUAN Zhiye(State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China;State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Science, Beijing, 100012, China;Chinese Academy for Environmental Planning, Beijing, 100012, China;Zhongshan Environmental Protection Industrial Co., Ltd., Zhongshan, 528400, China;Beijing Zhengshi Environmental Engineering Co., Ltd., Beijing, 100076, China)

机构地区：[1]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012 [2]中国环境科学研究院国家环境保护地下水污染模拟与控制重点实验室,北京100012 [3]环境保护部环境规划院,北京100012 [4]中山市环保产业有限公司,中山528400 [5]北京铮实环保工程有限公司,北京100076

出　　处：《环境化学》2018年第4期679-688,共10页Environmental Chemistry

基　　金：国家自然科学基金(51408573)资助~~

摘　　要：为了研究生活垃圾填埋过程中富里酸(fulvic acids,FA)电子转移特征及其影响因素,通过紫外-可见吸收、荧光和红外光谱手段表征FA结构,使用电化学方法测定FA的电子供给能力(electron donating capacity,EDC)和电子接受能力(electron accepting capacity,EAC).结果表明,填埋初期(1—3年)FA分子量和芳香性随填埋深度增加而减小,而填埋中后期(>3年)FA分子量和芳香性随填埋深度增加而增加.随着填埋深度的增加FA中羟基和羧基含量先增加后减少,碳水化合物含量持续减少.填埋初期,FA的EAC随着填埋深度的增加而增加,EDC变化趋势不明显;填埋中后期FA的EDC和EAC随填埋深度呈现先增加后减小的趋势.表层填埋垃圾中FA给电子基团起主导作用,而深层填埋垃圾中FA接受电子基团起主导作用.相关性分析显示FA分子量越小、碳水化合物含量越低、羟基含量越高,越利于FA给出电子;而FA分子量越大、羧基含量越高、碳水化合物和脂肪族含量越低,越利于FA得到电子.The objective of this study is to investigate the electron transfer capacity（ ETC） of fulvic acid（ FA） extracted from landfilled municipal solid waste and the factors affecting its ETC.Fluorescence,UV-Vis absorption and Flourier-transformed infrared spectroscopy（ FTIR） were used to characterize the structure of FAs. Electrochemical method was used to measure the electrondonating capacity（ EDC） and electron accepting capacity（ EAC） of FAs. The experimental results indicated that the molecular weight（ MW） and aromaticity of fresh landfill-derived（ 1—3 years） FA decreased during the landfill process,whereas the MW and aromaticity of intermediate and aged landfill-derived（ 〉3 years） FA increased with the depth. The relative content of FA hydroxyls and carboxyl increased firstly, and then decreased with the depth, however the FA carbohydrate decreased. The EAC increased with the depth. The EDC showed no systemic trend from 0 to 3 years.The EAC and EDC both increased firstly,and then decreased during the intermediate and old landfill process. Electron donating functional groups of FA extracted from the shallow layer played an important role,while the electron accepting functional groups of FA extracted from the deep layer played a leading role. The results obtained from correlation analysis showed that the small MW FA containing large number of hydroxyls but a small of carbohydrates could provide more electrons to the acceptors. On the other hand,the small MW FA containing a large number of carboxyl and a small of carbohydrates and aliphatics could accept more electrons from the donators.

关 键 词：生活垃圾 填埋 富里酸 电子转移 

分 类 号：X799.3[环境科学与工程—环境工程]