Issue 3, 2024

Treatment of oilfield wastewater and synthesis of Na2FeO3 in a chloride ion anode oxidation system

Abstract

This study investigates the degradation of oil recovery wastewater and the generation of Na2FeO3 in an anodic oxidation system. The electrochemical oxidation technique with a Ti/Ru–Ir oxide-coated anode and NaCl as electrolyte was used to treat oilfield wastewater, which reduced the TOC value in the wastewater from 210 mg L−1 to 115.9 mg L−1. Meanwhile, active chlorine was generated in the wastewater; subsequently, ferric sulfate and sodium hydroxide were added to the electrolyzed wastewater, and the formation of Fe(III) precipitates due to the coagulation effect further reduced the TOC value in the wastewater to 25.7 mg L−1 and generated blue-green substances. Analytical tests by infrared spectroscopy, ultraviolet-visible spectroscopy, X-ray diffraction (XRD), and Mössbauer spectroscopy proved that the blue-green substance was Na2FeO3. Na2FeO3 may be a more effective water treatment agent. The method used in this not only achieves waste resource recycling, but also offers the potential for large-scale production of Na2FeO3.

Graphical abstract: Treatment of oilfield wastewater and synthesis of Na2FeO3 in a chloride ion anode oxidation system

Supplementary files

Article information

Article type
Paper
Submitted
16 Oct 2023
Accepted
30 Nov 2023
First published
09 Jan 2024

Environ. Sci.: Water Res. Technol., 2024,10, 614-619

Treatment of oilfield wastewater and synthesis of Na2FeO3 in a chloride ion anode oxidation system

H. Guo, Y. Wang and N. Zhang, Environ. Sci.: Water Res. Technol., 2024, 10, 614 DOI: 10.1039/D3EW00762F

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