生活垃圾填埋场垃圾腐殖质的组成和波谱特性

Composition and Spectroscopic Characteristics of Humic Substances in a Landfill

摘要:

以上海老港垃圾填埋场不同年份的填埋垃圾为对象,利用元素分析、FTIR光谱和固态13C CP/MAS NMR方法,研究了不同填埋龄垃圾腐殖质的来源、组成和结构及其随填埋龄的变化规律.结果表明胡敏酸(HA)以稳定的木质素残体和芳香结构聚合物为主,含量显著高于富里酸(FA),烷基碳在HA中所占的比例也在FA中高;而FA的羧基官能团含量显著高于HA,FA中与环状多聚糖结构相关的氧基碳的含量也比HA中多,说明HA的芳香缩合度和稳定度比FA高.随着垃圾填埋时间的延长,HA的芳香性和稳定度逐渐增强,FA的羧基等含氧官能团减少,说明垃圾腐殖质的腐殖化程度提高.

Abstract:

Humic acids(HA) and fulvic acids(FA)extracted from the aged refuse samples in Shanghai Laogang MSW Landfill site were characterized by elemental analysis,FTIR and 13C CP/MAS NMR.The results show that lignin and aromatic compounds,the major components of HA,are apparently more in HA than in FA.The proportion of alkyl-C in HA is also higher than that in FA.On the contrary,carboxylic acid groups are of large proportion in FA,and the oxy carbons related to cyclic polysaccharide are more in FA than those in HA.The degrees of aromatic condensation and stability of HA are higher than those of FA.On the other hand,with the increasing of the landfill age,the aromaticity and satability of HA increase while the content of oxygen-containing groups especially carboxylic acid in FA decreases.The degree of humification of both HA and FA increase with the increasing of landfill age.