Oil removal in tight-emulsified petroleum waste water by flocculation

International Conference on Manufacturing Technology, Materials and Chemical Engineering

机械制造;材料科学;化学工业

Pan, L.L.^1,3,4 ; Chen, Y.^1,3 ; Chen, D.^1,3 ; Dong, Y.Q.^2 ; Zhang, Z.T.^1 ; Long, Y.X.^4

Institute of Petrochemical and Energy Engineering, Zhejiang Ocean University, Zhoushan, Zhejiang

316022, China^1

Institute of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu

213016, China^2

U. National-Local Engineering Laboratory of Harbor Oil and Gas Storage and Transportation Technology, Zhoushan, Zhejiang

316022, China^3

China Petroleum Group Engineering Design Co. Ltd., Qinghai Branch, Dunhuang, Gansu

736200, China^4

关键词: Emulsified oil;    Oil removal efficiencies;    Oily wastewater;    Petroleum wastes;    Petroleum wastewater;    Routine analysis;    Supernatant liquids;    Weighted averages;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/392/4/042005/pdf
DOI  :  10.1088/1757-899X/392/4/042005

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this study, the emulsified oily wastewater was collected from a petrochemical plant. The size distributions of the emulsified oil particles in the wastewater and the supernatant liquid generated from the wastewater flocculation were conducted using scattered light, and routine analyses of COD and oil content in the wastewater were performed. This paper studied the oil removal process during flocculation using PAC and/or PAM and discussed the reason of low degreasing rate of the tight-emulsified petroleum wastewater. Experimental results show that the emulsified petroleum wastewater is a kind of high-concentration (COD, 9,600.0 mg•L-1) tight-emulsified (weighted average oil particle size, 440 nm) oil-containing (553.0 mg•L-1) wastewater. Compared with that in treating ordinary emulsified wastewater, the oil removal efficiency of the flocculation method based on PAC and PAM in treating tight-emulsified petroleum wastewater is relatively low (the highest oil removal rate is only about 85%). It is speculated that the reasons may be that the PAC and PAM form small oil alum flocs that do not sediment easily in water.