Issue 6, 2023

Treatment of wastewater from the thermal desorption of oil-contaminated soil: performance and sorption mechanism of pyrolytic modified sawdust

Abstract

The green development of the petrochemical industry by using waste biomass for efficient and environmentally friendly oil/water separation is emerging in recent years. Herein, in view of the oily wastewater generated by thermal desorption (TD) for remediating oil-contaminated soil, the pyrolysis modification of waste biomass sawdust and its application to oil removal from thermal desorption wastewater (TDW) were conducted. The results showed that modified sawdust (MS) exhibited excellent hydrophobicity and high sorption capacity, showing abundant microporous structure (3.90 m2 g−1) and pore volume (0.02 cm3 g−1). The oil removal rate increased from 60.3% of the raw sawdust to 97.3% of MS, and the oil/water selectivity coefficient (2.52) was 5.5 times higher than that before the modification (0.46). For the actual high oil content (1377 mg L−1) of emulsion TDW, the MS layer showed high flux (4276.8 LMH) and considerable sorption performance, with turbidity, COD, and oil removal rates of 99.2%, 24.5%, and 83.3%, respectively. In addition, the MS layer showed excellent sustainability in multiple cycle feeding experiments (10 cycles per 200 mL) and the flux could be essentially restored merely by scraping off the surface MS. Furthermore, the treatment cost and risks of secondary pollution were reduced. This work proposed a new strategy of low cost, environment-friendly, and high-efficiency oil sorption, which is a promising method for the practical treatment of highly oily wastewater.

Graphical abstract: Treatment of wastewater from the thermal desorption of oil-contaminated soil: performance and sorption mechanism of pyrolytic modified sawdust

Supplementary files

Article information

Article type
Paper
Submitted
03 Dez 2022
Accepted
21 Apr 2023
First published
21 Apr 2023

Environ. Sci.: Water Res. Technol., 2023,9, 1599-1609

Treatment of wastewater from the thermal desorption of oil-contaminated soil: performance and sorption mechanism of pyrolytic modified sawdust

F. Xiao, T. Chen, H. Cao, H. Lin, S. Jiang and J. Yin, Environ. Sci.: Water Res. Technol., 2023, 9, 1599 DOI: 10.1039/D2EW00918H

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