不同曝气梯度对腐殖土中DOM的释放影响  

The impact of different aeration gradients on the release of DOM in humic soil

作　　者：陈毅强 蒋栩 侯俊[2] 苗令占 CHEN Yi-qiang;JIANG Xu;HOU Jun;MIAO Ling-zhan(Jiangsu Environmental Engineering Technology Co.,Ltd,Nanjing 210098,China;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]江苏省环境工程技术有限公司,江苏南京210098 [2]河海大学环境学院,浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《中国环境科学》2025年第3期1465-1473,共9页China Environmental Science

基　　金：国家重点研发计划(2023YFE0100900);江苏省自然科学基金资助项目(BK20230763);江苏省科协青年科技人才托举工程(JSTJ-2023-XH022)。

摘　　要：为探讨不同曝气梯度对腐殖土中溶解性有机物(DOM)释放的影响,以揭示腐殖土释碳性能及其在污水处理中的应用潜力,本研究通过设置无曝气,低曝气,中曝气和高曝气4种梯度,开展600h的释碳实验,利用总有机碳(TOC)分析,三维荧光光谱-平行因子分析(EEM-PARAFAC)及紫外-可见光吸收光谱法,检测各时间点的释碳量及DOM组分变化.结果显示:曝气强度显著影响腐殖土的释碳量及周期,在中曝气量之前释碳量随曝气强度增加而增加,超过中曝气量后反而减少.曝气因素对芳香蛋白类物质I(C1)与富里酸物质(C3)的释放起到了促进效果,但是对这两种组分的促进强度与效果存在差异,曝气因素对芳香蛋白类物质Ⅱ(C2)与溶解性微生物代谢产物(C4)的释放起到了抑制效果,并且对这两种组分的抑制效果与强度同样存在差异.紫外-可见光吸收分析表明,腐殖土释碳过程中DOM的芳香性和腐殖化程度随时间增加.在600h的试验周期内,腐殖土释碳周期约为248h,较高的曝气强度有助于提高DOM的微生物利用率.To unveil the carbon release capacity of humic soil and its potential applications in wastewater treatment,this study explored the impact of various aeration gradients on the release of dissolved organic matter(DOM)from humic soil.By establishing gradients of no aeration,low aeration,medium aeration,and high aeration,the carbon release experiment lasting 600 hours was conducted.The carbon release capacity at various time points and DOM changes in components were monitored with the aid of total organic carbon(TOC)analysis,three-dimensional fluorescence spectroscopy-parallel factor analysis(EEM-PARAFAC),and UV-visible absorption spectroscopy.Results showed that aeration intensity significantly affected the amount and cycle of carbon release from humic soil.Before reaching medium aeration,the carbon release capacity increased with the intensity of aeration,followed by a decrease afterwards.Aeration was found to enhance the release of aromatic protein-like substance I(C1)and humic-like substances(C3).However,the intensity and effectiveness of the enhancement varied between these two components.Conversely,aeration suppressed the release of aromatic protein-like substance II(C2)and soluble microbial metabolic substances(C4),where differences were also observed.UV-visible absorption analysis indicated that the aromaticity and humification degree of DOM increased over time during the carbon release process from humic soil.The carbon release cycle was about 248h during the 600-h test,higher aeration intensities were found to improve the microbial utilization of DOM.

关 键 词：腐殖土 溶解性有机物 曝气强度 

分 类 号：X52[环境科学与工程—环境工程]