Abstract: Wet absorption technology is widely employed in the absorption of oil fumes due to its low cost and operational simplicity, with the absorption liquid playing a crucial role in determining absorption performance. To address the low absorption efficiency of conventional absorption liquids, this study developed a composite absorption system by combining the anionic surfactant sodium dodecyl sulfate (SDS) with the nonionic surfactant sorbitan trioleate (Span85) at optimized mass ratios, supplemented with sodium hypochlorite as an oxidizing agent. The absorption efficiency was evaluated through measurements of particulate matter concentration using a laser particle counter and non-methane hydrocarbon (NMHC) concentration via flame ionization detection (FID). Firstly, influence of surfactant mass ratios on static oil emulsification performance was investigated. Secondly, the effects of absorption liquid type, concentration, and gas-liquid volume ratio on the absorption efficiencies of NMHC and particulate matter were systematically examined. Experimental results demonstrated that the surfactant mixture with a hydrophilic-lipophilic balance (HLB) value of 6, achieved by regulating the Span85-SDS mass ratios, exhibited the optimal oil emulsification and dispersion abilities. The composite absorption liquid showed significantly superior absorption performance compared to single-surfactant solutions or commercial alternatives. Maximum absorption efficiencies of 90.8%, 91.2%, and 94.4% for NMHC, PM2.5, and PM10, respectively, were achieved under optimal conditions with a total surfactant concentration of 1000 mg/L and a gas-liquid volume ratio of 5. The enhanced absorption performance was attributed to the synergistic effects between NMHC oxidation by the oxidizing agent and improved particulate matter dispersion through surfactant action. This study provides a viable strategy for formulating high-performance absorption liquids for oil fume purification, demonstrating that optimized surfactant combinations with the appropriate addition of an oxidizer can effectively address both gaseous and particulate pollutants in oil fume emissions. The findings offer practical guidance for the development of efficient and cost-effective absorption systems for commercial kitchen emission control.

Key words: wet absorption, oil fume abatement, surfactant, PM, NMHC, absorption efficiency

摘要： 湿法吸收技术由于成本低、操作简单，在餐饮油烟废气净化领域应用广泛，而吸收液的性能对净化效果起决定性作用。针对现有吸收液吸收效率偏低的问题，本研究选取阴离子表面活性剂十二烷基硫酸钠(SDS)与非离子表面活性剂三油酸山梨坦(Span85)为复配基材，通过调配二者质量比并引入氧化剂次氯酸钠，构建了一种复配型吸收液。利用激光粒子计数器、火焰光度检测器(FID)测定油烟中颗粒物浓度及非甲烷总烃(NMHC)浓度，评价油烟吸收性能，系统考察了表面活性剂配比对静态油乳化性能的影响，以及吸收液种类、浓度和油烟与吸收液气液体积比对NMHC及油烟颗粒物吸收效率的影响。结果表明，当不同Span85和SDS质量配比形成的亲水亲油(HLB)值为6的复配表面活性剂时，表现出最优的静态油乳化分散性能；所构建的复配型吸收液对油烟NMHC和颗粒物的吸收效率显著优于单一成分或市售产品；当吸收液总浓度为1000 mg/L、气液体积比为5时，净化性能最佳，对NMHC, PM2.5和PM10的吸收效率分别达到90.8%, 91.2%和94.4%。油烟净化性能的提升源于复配吸收液对NMHC的氧化作用与对颗粒物溶解能力增强的协同效应，该研究为高性能油烟净化吸收液的调配优化提供了新思路。

关键词: 湿法吸收, 油烟净化, 表面活性剂, 颗粒物, 非甲烷总烃, 吸收效率