Issue 12, 2022

Anodic oxidation to produce persulfate for treatment of oilfield wastewater and synthesis of Fe(vi)

Abstract

To improve the effect of oilfield wastewater treatment and achieve the purpose of resource utilization of waste, in this study, an electrochemical method including an anodic oxidation-derived persulfate system for the treatment of oilfield wastewater and preparation of ferrate(VI) is reported. In an anodic oxidation system in which Na2SO4 is used as the electrolyte, the formation reaction of persulfate and the degradation reaction of organic pollutants co-occurred. After the electrolysis, NaOH and Fe2(SO4)3 were added to the system, and the newly generated Fe(OH)3 can further remove TOC from organic wastewater. Ferrate(VI) was prepared by oxidizing Fe(OH)3, using the oxidative properties of the reactive radicals produced by the activation of persulfate. This method used persulfate instead of hypochlorite, which was traditionally used to prepare ferrate(VI) and to prevent the pollution of air and the environment. Moreover, ferrate(VI) is synthesized while degrading oilfield wastewater, which achieves the recycling of resources. The results showed that the TOC removal of wastewater treated by this process reached 88.9%, which could meet the discharge requirements. In addition, the ferrate(VI) concentration was 0.98 mmol Lāˆ’1 after 3 h of reaction under suitable dosing conditions. This study showed promising results in the treatment of organic pollutants in oilfield wastewater and can provide some references for research in this area.

Graphical abstract: Anodic oxidation to produce persulfate for treatment of oilfield wastewater and synthesis of Fe(vi)

Supplementary files

Article information

Article type
Paper
Submitted
30 Jun 2022
Accepted
30 Sep 2022
First published
04 Oct 2022

Environ. Sci.: Water Res. Technol., 2022,8, 2895-2904

Anodic oxidation to produce persulfate for treatment of oilfield wastewater and synthesis of Fe(VI)

L. Wu, H. Yan and N. Zhang, Environ. Sci.: Water Res. Technol., 2022, 8, 2895 DOI: 10.1039/D2EW00500J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements