Lai Chaochao, He Caiwen, Han Fengxia, Xu Huayu, Huang Bin, Dionysiou Dionysios D, Pan Xuejun
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Provincial Key Laboratory of Carbon Sequestration and Pollution Control in Soils, Kunming, 650500, China.
Environ Pollut. 2021 Apr 15;275:116546. doi: 10.1016/j.envpol.2021.116546. Epub 2021 Feb 3.
Effluent is often treated with ozone before being discharged into a natural water environment. This process will change the interaction between effluent organic matter and pollutants in aquatic environment. The impact of ozonation on complexation between dissolved organic matter in such wastewater and sulfadimidine often found in natural water was studied in laboratory experiments using four types of real wastewater. Ozonation was found to decrease the proportion of organic matter with a molecular weight greater than 5 kDa as well as protein-like, fulvic-like and humic-like components, but except the proportion of hydrophilic components. The aromaticity of the dissolved organic matter was also reduced after ozonation. The complexation of tryptophan and tyrosine with sulfadimidine mainly depends on their hydrophobicity and large molecular weight. Ozonation of fulvic and humic acid tends to produce small and medium molecular weight hydrophilics. The complexation of humic and fulvic acids with sulfadimidine was enhanced by ozonation. Dissolved organic matter, with or without oxidation, were found to weaken sulfadimidine's inhibition of microbial growth, especially for Aeromonas and Acinetobacter species. This finding will expand our understanding about the impact of advanced treatment processes on the dissolved organic matters' properties in effluent.
废水在排放到自然水环境之前通常会用臭氧进行处理。这个过程会改变废水中的有机物与水环境中污染物之间的相互作用。在实验室实验中，使用四种实际废水研究了臭氧化对这类废水中溶解有机物与天然水中常见的磺胺二甲嘧啶之间络合作用的影响。研究发现，臭氧化会降低分子量大于5 kDa的有机物以及蛋白质类、富里酸类和腐殖酸类成分的比例，但亲水性成分的比例除外。臭氧化后，溶解有机物的芳香性也会降低。色氨酸和酪氨酸与磺胺二甲嘧啶的络合主要取决于它们的疏水性和大分子质量。富里酸和腐殖酸的臭氧化倾向于产生中小分子量的亲水性物质。臭氧化增强了腐殖酸和富里酸与磺胺二甲嘧啶的络合。发现无论是否经过氧化，溶解有机物都会削弱磺胺二甲嘧啶对微生物生长的抑制作用，尤其是对气单胞菌属和不动杆菌属的抑制作用。这一发现将拓宽我们对深度处理工艺对废水中溶解有机物性质影响的理解。
