Selective removal of color substances by carbon-based adsorbents in livestock wastewater effluents.

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Livestock wastewater effluent generated after the anaerobic treatment process contains the considerable amount of color-causing organic matter. In this study, a quantitative comparison of three carbon-based adsorbents included granular activated carbon (GAC), expanded graphite (EG), and multi-walled carbon nanotubes (MWNTs) was carried out for the potential application to the removal of color substances, and their mechanism was proposed. Although GAC showed the highest specific dissolved organic carbon (DOC) adsorption capacity, the color removal efficiency was the smallest among three adsorbents. The selective color removal ratios of EG and MWNTs reached 22.7 +/- 0.1 PtCo/mg-DOC-removed and 21.2 +/- 0.1 PtCo/mg-DOC-removed, respectively, while that of GAC was only 12.3 +/- 0.1 PtCo/mg-DOC-removed. The selective adsorption of color substances by graphene-based carbon materials was due to the aromatic pi-pi interaction between organic matter and the hexagonal carbon lattice of graphene. The analysis of molecular weight distribution also confirmed that the exposed surface area and macro-pores were responsible for the adsorption of high molecular weight color substances. The chemical regeneration of three adsorbents was examined using 1% NaOCl solution and MWNTs showed almost complete recovery of the initial color removal capacity. In conclusion, MWNTs were the most suitable carbon nanomaterial for the selective color removal from livestock wastewater effluent.
Publisher
Kluwer Academic Publishers
Issue Date
2020-03
Language
English
Article Type
Article
Citation

Environmental Geochemistry and Health, v.42, no.6, pp.1643 - 1653

ISSN
0269-4042
DOI
10.1007/s10653-020-00547-w
URI
http://hdl.handle.net/10203/276750
Appears in Collection
CE-Journal Papers(저널논문)
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