Demulsification and oil recovery from oil-in-water cutting fluid wastewater using electrochemical micromembrane technology. (20th January 2020)

• Record Type: Journal Article
• Authors: Chen, Peng; Yin, Di; Song, Pengfei; Liu, Yiyang; Cai, Lankun; Wang, Hualin; Zhang, Lehua
• Is Part Of: Journal of cleaner production. Volume 244(2020)
• Publication Date: 2020-01-20
• Subjects: Demulsification -- Oil recovery -- Electrochemistry -- Membrane separation -- Stainless steel membrane; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.118698
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: A novel electrochemical micromembrane technology coupling membrane and electric method was developed to demulsify oily wastewater and recover oil. The diameter of the oil droplets increased to 55.0 μm from the initial 7.0 μm after treating the emulsion with the electrochemical micromembrane technology. Chemical oxygen demand removal rate and oil recovery reached 87.89% and 5173 mg/L, respectively, after cycling for 90 min at 10.0 V voltage with a 10.0 mm electrode distance, a 5.0 μm micromembrane pore size and a 0.5 L/min flow rate. Micromembrane pore sizes of 1.0 and 5.0 μm were both effective for decreasing chemical oxygen demand and recovering oil. The recovered oil was the mixture of mineral oil and ester according to the Raman infrared spectroscopy analysis. Surface charge redistribution and electrogenerated destruction for hydrophilic groups of surfactant molecules are responsible for oil coalescence. The electrochemical micromembrane technology used in this study offer an attractive treatment option to demulsify oily wastewater. Graphical abstract: Image 103 Highlights: An electrochemical micromembrane technology was developed to demulsify and recover oil. Diameter of oil droplets increased to 55.0 μm from the initial 7.0 μm by electrochemical micromembrane technology. Surface charge density was redistributed on oil droplet passing through micromembrane. Collision between oil droplets and electrode destroyed hydrophilic group of surfactant.