Study on Treatment of Organic Wastewater from Cutting Fluid by Electro-flocculation-Multiphase Fenton/Ultrasonic System
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School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China
China Energy Engineering Corporation Limited Liaoning Institute, Shenyang 110179, China
Submission date: 2022-03-19
Final revision date: 2022-06-11
Acceptance date: 2022-06-20
Online publication date: 2022-09-12
Publication date: 2022-11-03
Corresponding author
Nana Wu   

Shenyang Jianzhu University, School of Municipal and Environmental Engineering,, 110168, Shenyang, China
Pol. J. Environ. Stud. 2022;31(6):5329-5342
The composition of cutting fluid wastewater is complex, containing oil and various additives. Due to different production processes, various metal particles will be mixed, which has caused great difficulties in wastewater treatment. In this study, electro-flocculation-multiphase Fenton/ultrasound system was used to treat cutting fluid organic wastewater. Firstly, the demulsification pretreatment was carried out by electroflocculation method, which achieved 97.4% CODcr removal efficiency. Afterwards, a multiphase Fenton/ultrasonic system was used for advanced treatment. By comparing the SEM results, BET results, XRD results and CODcr removal efficiency of the catalysts prepared by different supports and methods, CuO/CeO2 catalyst prepared by the deposition precipitation method was used in this experiment. The dissolution rate of copper in the catalyst CuO/CeO2 was only 1.29% after 4 hours of reaction. After 5 times of recovery, the recovery rate of the catalyst was still 95%, and the removal efficiency of CODcr was 29.8%. It proved that the catalyst CuO/CeO2 had good stability. Compared with a separate multiphase Fenton or ultrasound system, the multiphase Fenton/ultrasonic system had a better processing effect. Under the conditions of an ultrasonic frequency of 800 KHz, a reaction time of 180 min, a catalyst dosage of 1.6 g/L, a hydrogen peroxide dosage of 0.5 mol/L, and an initial pH of 8, the multiphase Fenton/ultrasonic system could achieve 65% CODcr removal efficiency. This study found that electro-flocculation-multiphase Fenton/ultrasonic system could finally achieve 99.09% CODcr removal efficiency.
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