不同辅料与生物沥浸深度脱水污泥混合堆肥中溶解性有机质的光谱特征研究  

Study on Spectral Characteristics of Dissolved Organic Matter in Composting With Different Conditioners and Leached Dewatered Sludge

作　　者：卢泽 席北斗[3] 台德志 陆良全 孙晓杰[1,2] 张军[1,2] 张华[1,2] LU Ze;XI Bei-dou;TAI De-zhi;LU Liang-quan;SUN Xiao-jie;ZHANG Jun;ZHANG Hua(College of Environmental Science and Engineering,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;State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]桂林理工大学环境科学与工程学院,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]中国环境科学研究院地下水与环境系统工程创新基地,北京100012

出　　处：《光谱学与光谱分析》2022年第7期2120-2129,共10页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(51868011);广西创新研究团队项目(2018GXNSFGA281001);广西“八桂学者”岗位专项资金项目;广西创新驱动发展专项资金项目(桂科AA18118013)资助。

摘　　要：生物沥浸深度脱水污泥为主料,四种农林有机废物为辅料,设4个处理组(T1:污泥+甘蔗渣、T2:污泥+秸秆、T3:污泥+米糠、T4:污泥+木屑)进行混合堆肥,采用紫外-可见光谱(UV-Vis)、傅里叶变换红外光谱(FTIR)和三维荧光光谱(3D-EEM),研究不同辅料堆肥过程中溶解性有机质(DOM)结构特征和组分含量的演化规律。UV-Vis结果显示,四个处理组在堆肥过程中DOM的芳香度和不饱和度皆有所增加,其中T3处理组的增加幅度最大。四个处理组的紫外参数SUVA_(254)和SUVA_(280)均呈现递增趋势,其中T3处理组的变化幅度高于其他三个处理组,表明芳构化程度加深,DOM分子量逐渐加大;E_(253)/E_(203)和E_(253)/E_(220)在堆肥结束时显著增加,表明DOM中苯环上的脂肪链发生氧化分解,转化为羧基羰基等官能团,A_(226~400)随堆肥进行增加而E_(250)/E_(365)减小,表明共轭程度增加。FTIR结果表明堆肥过程中多糖类、脂肪族类物质含量在减少,包括带有苯环的芳香族等不饱和有机物在增加,其中T4处理组的转化程度优于其他三个处理组。发射荧光光谱显示荧光峰位置由334 nm红移至422 nm附近,说明共轭程度低的物质不断降解,芳香基团不断缩合,生成结构复杂的类腐殖质物质。同步荧光光谱中代表类蛋白物质的荧光峰随堆肥时间由强变弱,代表腐殖质的荧光峰由弱变强,A_(250~308)值降低,A_(308~360)和A_(363~500)值上升,说明了类蛋白质物质在不断降解而类胡敏酸物质和类富里酸物质含量在上升。结合平行因子(PARAFAC)模型分析四个处理组的三维荧光光谱,将DOM解析为三类荧光组分,根据每个组分所在的激发、发射波长位置分析判断,三类组分分别是类富里酸物质,类胡敏酸物质和类色氨酸物质,且C1(类富里酸物质)和C2(类胡敏酸物质)组分所占百分比呈现增加趋势,C3(类色氨酸物质)组分所占百分比呈现减少趋势,表明类蛋白物质减少而�Bioleach deep dehydrated sludge was used as the main material,four kinds of agricultural and forestry organic wastes were used as conditioners for mixed composting.Four treatment groups(T1:sludge+bagasse,T2:sludge+straw,T3:sludge+rice bran,T4:sludge+sawdust)were set for mixed composting.UV-vis spectroscopy(UV-Vis),Fourier transform infrared spectroscopy(FTIR),and three-dimensional fluorescence spectrum(3 D-EEM)were used to study the structural characteristics and component content evolution of dissolved organic matter(DOM)in co-composting.The UV-vis results showed that the aromaticity and unsaturation of DOM increased in all treatment groups,and the T3 treatment group showed the largest increase.SUVA_(254) and SUVA_(280) of four composting treatment groups showed an increasing trend.The change range of the T3 treatment group was higher than the other three treatment groups,indicating that the degree of aromatization deepened,the molecular weight of DOM gradually increased.E_(253)/E_(203) and E_(253)/E_(220) increased significantly at the end of composting,indicating that the aliphatic chain on the benzene ring in DOM was oxidized,decomposed,and transformed into functional groups such as carboxyl group and carbonyl group.A226~400 increased with composting,while E_(250)/E_(365) decreased,indicating that the conjugation degree increased.FTIR results show that the content of polysaccharides and aliphatic substances decreased during composting,and unsaturated organic substances such as aromatic compounds increased.The transformation degree of the T4 treatment group was better than the other three treatment groups.Emission fluorescence spectra showed that the fluorescence peak position shifted from 334 nm to around 422 nm with composting,which indicated that the substances with low conjugation degree were continuously degraded,and aromatic groups were continuously condensed to form humic-like matters.In the synchronous fluorescence spectrum,with composting time,the fluorescence peak of protein-like substances changed f

关 键 词：溶解性有机质(DOM) 辅料 生物沥浸深度脱水污泥 堆肥 光谱特征 

分 类 号：O657.3[理学—分析化学]