H_(2)O_(2)辅助污泥水热过程水DOM的光化学行为研究  

Photochemical behavior of dissolved organic matter in process water from hydrogen peroxide assisted hydrothermal carbonization of sludge

作　　者：张闯 王冰玉 谢慧芳[1] 冯彦房[2] 曲虹霞[3] ZHANG Chuang;WANG Bing-yu;XIE Hui-fang;FENG Yan-fang;QU Hong-xia(Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse,School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Key Laboratory of Agro-Environment in Downstream of Yangtze Plain,National Agricultural Experiment Station for Agricultural Environment,Ministry of Agriculture and Rural Affairs,Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences,Nanjing,210014,China;School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学环境与生物工程学院,化工污染控制与资源化江苏省高校重点实验室,江苏南京210094 [2]江苏省农业科学院农业资源与环境研究所,农业农村部长江下游平原农业环境重点实验室,江苏南京210014 [3]南京理工大学化学与化工学院,江苏南京210094

出　　处：《中国环境科学》2024年第6期3179-3188,共10页China Environmental Science

基　　金：国家自然科学基金资助项目(42107398,42277332);江苏省自然科学基金资助项目(BK20210358,BK20221428);南京理工大学大型仪器设备开放基金资助项目(南理工大仪-2023-38)。

摘　　要：采用水热炭化和添加4%H_(2)O_(2)辅助水热炭化两种工艺处理脱水污泥,在测定两种过程水DOM基本理化性质的基础上,重点比较了两种DOM的光漂白行为和光生活性物种的产生情况.结果表明,与水热炭化工艺相比,H_(2)O_(2)辅助水热炭化工艺中伴生的过程水DOM的pH值较低,电导率、TOC、腐殖质类物质含量、芳香性官能团、分子量及腐殖化程度均较高,并表现出更强的光敏感性.在模拟自然光照射条件下,其芳香性和腐殖化程度随光照时间延长而降低,荧光组分含量显著下降,其中腐殖质类组分降低最为明显.光照过程中产生更多的单线态氧(1O2)和三重激发态(^(3)DOM^(*)),可显著促进四环素的光降解(93.22%),且^(3)DOM^(*)起主导作用.本研究明确了H_(2)O_(2)辅助水热炭化过程水DOM的光化学行为,可为水热炭化处理污泥产生的过程水的进一步处理及利用提供理论依据.In this study,HTC and 4%H_(2)O_(2)-assisted HTC were used to treat dewatered sludge.Based on the determination of the basic physicochemical properties of the two process-water DOMs,we focused on comparing the photobleaching behaviors of the two DOMs and the generation of photogenerated species.The results showed that DOM derived from H_(2)O_(2)-assisted HTC process water had lower pH,higher conductivity,TOC,humic-like substance content,aromatic functional groups,molecular weight,and degree of humification,and exhibited greater photosensitivity compared to DOM form HTC process water.Under the simulated natural light irradiation conditions,the aromaticity and humicity of DOM decreased with the prolongation of light exposure,and the content of fluorescent components in DOM decreased significantly,with the humic-like components decreasing most significantly.During the irradiation process,more singlet oxygen(1O2)and triplet excited state(^(3)DOM^(*))were generated,which can significantly promote the photodegradation of tetracycline(93.22%),and^(3)DOM^(*)played a leading role.This study clarifies the photochemical behavior of DOM derived from H_(2)O_(2)-assisted HTC,which can provide a theoretical basis for the further treatment and utilization of process water produced by HTC of sludge.

关 键 词：辅助水热炭化 溶解性有机质(DOM) 光漂白 光降解 四环素 

分 类 号：X703[环境科学与工程—环境工程]