Experimental Study on Silica and Organic Matter Removal from Heavy Oil Wastewater Before Evaporation

doi:10.11930/j.issn.1004-9649.2016.01.037.07

Abstract

Abstract: The heavy oil wastewater, which is of high temperature, high salinity, SiO2 and organic matter concentrations, is the major raw water source for the thermal power plants built in oilfield areas. To conduct the heavy oil wastewater treatment with evaporation desalination technique, the study on silica and organic matter removal is performed using chemical reaction and enhanced coagulation technology to reduce the risks of silica scaling in the evaporator as well as to enhance the quality of the evaporation water product. The experimental results show that with the joint Ca(OH)2, MgCl2?6H2O, PAC and PAM dosing and under the optimal processing condition, the effluent total silica concentration is decreased to 25.5 mg/L and its removal rate reaches as much as 89.5%. The gas chromatography-mass spectrometer(GC-MS) analysis results indicate that the predominant organic compounds in the heavy oil wastewater and the effluent of its pretreatment process are organic acids and nitrogen compounds. The pretreatment process can remove the organic acids notably but has little effect on VOCs removal.

Key words: thermal power plant, oil field, heavy oil wastewater, pretreatment, silica, organic matter

CLC Number:

X741

WANG Jing, MAO Jin, ZHAO Jianqiang, WANG Jinlei, PU Ping, GUO Weizhong, LI Yajuan. Experimental Study on Silica and Organic Matter Removal from Heavy Oil Wastewater Before Evaporation[J]. Electric Power, 2016, 49(1): 37-43.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.01.037.07

https://www.electricpower.com.cn/EN/Y2016/V49/I1/37

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