中文关键词污泥超高温堆肥腐熟度DOM光谱分析 英文关键词sewage sludgehyperthermophilic compostingmaturityDOMspectroscopic characterization

作者	单位	E-mail
刘晓明	广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650	xmliu@soil.gd.cn
余震	广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650	yuzhen@soil.gd.cn
周普雄	广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650 福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002
罗海林	广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650 福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002
王跃强	广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650
廖汉鹏	福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002
周顺桂	福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002

中文摘要 为了明确超高温堆肥新工艺在促进腐殖化进程中的优势，采用三维荧光光谱（3D-EEM）等光谱学方法研究了污泥超高温堆肥过程中DOM的结构特征及其变化规律.结果表明，堆体≥ 80℃的超高温阶段持续5 d（最高温度90℃），50℃以上高温阶段达到22 d，反映了堆肥过程中强烈的微生物代谢活性.E₂₅₃/E₂₀₃、SUVA₂₈₀、S_275~295等9个紫外-可见光光谱（UV-Vis）指标在0~23 d变化显著，指出DOM的芳香化和堆肥腐殖化程度逐渐增强.3D-EEM光谱结合荧光区域体积积分技术（FRI）分析指出，DOM中蛋白类物质在超高温堆肥过程的0~6 d几乎完全被降解；腐殖酸和富里酸类物质在0~23 d大量形成，堆肥在高温阶段达到完全腐熟，这与种子发芽指数（GI）在23 d所指示的腐熟度评价结果（98.5%）一致.基于多种光谱学指标的相关性分析，P_Ⅴ，n/P_Ⅲ，n与其它光谱学均呈现较好的相关性（r ≥ 0.68），可以作为评价超高温堆肥腐熟度的光谱学指标.上述结果证实了超高温堆肥工艺可加快堆肥腐熟进程、缩短堆肥周期至20 d左右，在有机固废资源化领域具有极大的应用潜力. 英文摘要 Spectroscopy methods such as three-dimensional excitation-emission (3D-EEM) fluorescence spectroscopy were applied to analyze the structures and changes of DOM in hyperthermophilic composting of sewage sludge to fully understand the advantages of hyperthermophilic composting in promoting sludge maturity. The results showed that the temperature reached its peak value at 90℃ and remained over 80℃ for 5 d. The thermophilic period more than 50℃ lasted for 22 d. This indicated that the microorganisms were metabolically active during the composting. The parameters of UV-visible (UV-Vis), including E₂₅₃/E₂₀₃, SUVA₂₈₀, and S_275-295, significantly changed from days 0 to 23, showing that the aromaticity degree of DOM and the humification degree of the compost gradually strengthened. Combined with the fluorescence regional integration (FRI), the 3D-EEM analysis results illuminated that the protein-like materials in DOM were completely degraded during days 0 to 6 of the hyperthermophilic composting and a large amount of humic acid-like and fulvic-like materials formed from days 0 to 23, indicating the compost was mature at the hyperthermophilic stage. This was consistent with the germination index (GI) on day 23 (GI=98.5%) as well. Based on the correlation analysis between spectroscopic parameters, P_Ⅴ,n/P_Ⅲ,n showed close relationship with others (r ≥ 0.68), showing their potential as indicators for maturity of hyperthermophilic composting. The results above confirmed that fermentation time could be greatly shortened to about 20 d by using the hyperthermophilic composting, which has great potential for application in organic solid waste management.

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