文献类型：期刊文献

英文题名：Experimental study on the elution of ultrasonically coupled sodium citrate-enhanced oily sludge

作者：Gu, Siwei[1];Wang, Ning[2];Huang, Yaohua[1];Xiang, Zhi[2];Yang, Qiang[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Zhejiang Acad Special Equipment Sci, Hangzhou 310020, Peoples R China

年份：2025

卷号：219

起止页码：357

外文期刊名：CHEMICAL ENGINEERING RESEARCH & DESIGN

收录：;EI(收录号：20252518636388);WOS:【SCI-EXPANDED(收录号:WOS:001513945200004)】；

基金：This work is financially supported by the National Natural Science Foundation of China (No. 52025103) .

语种：英文

外文关键词：Oily sludge; Ultrasound; Bubbles; Cavitation collapse; Sodium citrate

摘要：Oily sludge contains hydrocarbons, benzene, phenols, polycyclic aromatic hydrocarbons, heavy metals, and other toxic and harmful substances, making it harmful and dangerous solid waste. To reduce the amount of oily sludge in environment, an ultrasonic oil removal method coupling sodium citrate was proposed. Experimental results showed that a weakly alkaline environment could increase the contact angle between microbubbles and oil layers, which was conducive to the effect of cavitation oil removal. At an ultrasonic frequency of 21 kHz, the removal efficiency of oil from oily sludge was the highest, reaching 51.56 % within 60 s. However, the ability of ultrasound to remove polar substances strongly bonded through hydrogen bonding between oil and a solid is limited. Sodium citrate (Na3Cit) could reduce the concentration of divalent cations that hinder the separation of the oil and solid by complexation reactions between citrate and metal cations. When 10 mmol/L Na3Cit was added during ultrasonic treatment, the removal efficiency of oil from sludge was 82.25 %, 1.6 times the oil removal efficiency of ultrasonic treatment at 21 kHz. The change in the Zeta potential of sodium citrate on bitumen showed that sodium citrate increased the electrostatic repulsion between oil and solids by increasing the negative charge of the oil phase to realize oil-phase desorption. The results show that a combination of micro-bubble collapse in ultrasonic fields and the sodium citrate oil removal method was used to further improve the dissociation of the oil phase from solid, which provided guidance for controlling the environmental petroleum hydrocarbon contamination.