垃圾填埋初期水溶性有机物电子转移能力特征研究

发布时间：2018-02-16 04:55

本文关键词： 水溶性有机物还原能力电子穿梭能力三维荧光光谱　出处：《分析化学》2016年10期 　论文类型：期刊论文

【摘要】：为了阐明填埋垃圾初期水溶性有机物(DOM)电子转移能力的演变规律及影响因素,采集不同深度填埋垃圾并提取DOM,以希瓦氏菌MR-1和柠檬酸铁(Fe Cit)分别作为电子供体和电子受体,测定DOM的电子供给能力(EDC)、电子接受能力(EAC)和电子穿梭能力(ESC),采用光谱分析技术对电子转移能力的3种影响因素进行解析。结果表明,DOM中类腐殖质物质和类蛋白物质既能够作为电子供体传递出自身携带的电子,又可以作为电子受体接受微生物供给的电子。随着垃圾填埋的进行,DOM的电子供给能力和电子接受能力均先升高后降低,而电子穿梭能力持续增强。类蛋白物质是填埋初期DOM的主要成分,其含量决定DOM的电子供给能力和电子接受能力的演变。随着填埋时间的延长,类蛋白物质的降解是DOM的电子接受能力和电子供给能力降低的主要原因。DOM反复氧化还原过程中光谱特征和参数变化规律显示DOM的电子穿梭能力主要源于DOM中类腐殖质物质。在填埋垃圾降解和腐殖化过程中,DOM中类腐殖质物质不断合成,致使其电子穿梭能力不断增强。
[Abstract]:In order to elucidate the evolution rule and influencing factors of electron transfer ability of water-soluble organic matter (DOM) in the early stage of landfill, the landfill waste was collected and extracted from different depth. The MR-1 and Fe citrate were used as electron donor and electron acceptor, respectively. The electron supply capacity, electron acceptance capacity and electron shuttle ability of DOM were determined. The three factors affecting the electron transfer ability were analyzed by spectroscopic analysis. The results showed that humus-like substances and protein-like substances in Dom were determined. Quality can be used as an electron donor to transmit the electrons that it carries. It can also be used as an electron receptor to receive electrons supplied by microorganisms. With the landfill, the electron supply capacity and electron receptivity of Dom increase first and then decrease. The content of protein-like substance is the main component of DOM in the early stage of landfill, and its content determines the evolution of electron supply ability and electron acceptance ability of DOM. Degradation of protein-like substances is the main reason for the decrease of electron receptivity and electron supply ability of DOM. The spectral characteristics and parameter changes of DOM during repeated redox of Dom indicate that the electron shuttle ability of DOM is mainly due to the decay in DOM. Merozoite substances. Humus-like substances in the Dom are continuously synthesized during the degradation and humification of landfill wastes, As a result of its electronic shuttle capabilities continue to enhance.
【作者单位】：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;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;兰州交通大学环境与市政工程学院;
【基金】：国家自然科学基金(No.51408573)资助~~
【分类号】：X705

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