Ozonation has been widely used as a viable advanced oxidation process (AOP) for elimination of PAHs in waste activated sludge through effective sludge disintegration and abatement of organic pollutants. However, sludge organic matter (SOM) influences PAHs degradation during ozone treatment is still rarely understood. In this study, we investigated such an influence with the aid of solid-state ¹³C nuclear magnetic resonance (NMR) spectroscopy and the corresponding two-dimensional correlation analysis (2D-COS) strategy. The results showed that the degradation of SOM macromolecules in the order of aromatic substances > aliphatic carbon > α carbon > amides groups > O-alkyl upon ozone treatment. Moreover, the PAHs removal efficiency was positively correlated with the aromaticity of sludge (R² = 0.84–0.98), while negative associated with its aliphaticity (R² = 0.81–0.95). Lastly, humic acid (HA) was used as a proxy of aromatic SOM to further explore their interaction with PAHs in sludge matrix. The results revealed that freely dissolved (HA-D) and suspended particulates (HA-S) imposed distinctively different influence on ozone-based PAHs degradation. The HA-S facilitated the elimination of PAHs by 7.95 ± 0.11%, while those HA-D reduced the removal efficiency by 16.70 ± 0.13%.

臭氧化已被广泛用作可行的高级氧化工艺 (AOP)，通过有效的污泥分解和减少有机污染物来消除废弃活性污泥中的多环芳烃。然而，在臭氧处理过程中，污泥有机物（SOM）对多环芳烃降解的影响仍然鲜为人知。在这项研究中，我们借助固态¹³ C 核磁共振 (NMR) 光谱和相应的二维相关分析 (2D-COS) 策略研究了这种影响。结果表明，臭氧处理后SOM大分子的降解顺序为芳香族物质>脂肪族碳>α碳>酰胺基>O-烷基。此外，PAHs的去除效率与污泥的芳香性（R ² = 0.84–0.98)，而与其脂肪含量呈负相关 (R ²  = 0.81–0.95)。最后，腐植酸 (HA) 被用作芳香 SOM 的代理，以进一步探索它们与污泥基质中多环芳烃的相互作用。结果表明，自由溶解（HA-D）和悬浮颗粒（HA-S）对基于臭氧的多环芳烃降解产生了截然不同的影响。HA-S 有助于去除 PAHs 7.95 ± 0.11%，而那些 HA-D 将去除效率降低 16.70 ± 0.13%。