Issue 12, 2019

Contaminant removal by efficient separation of in situ formed layered double hydroxide compounds from mine wastewaters

Abstract

The efficient removal of a range of anionic and cationic contaminants from acid mine waters to facilitate water reuse or for safe discharge constitutes a major environmental challenge. Recently, layered double hydroxide (LDH)-type materials have shown considerable efficacy at experimental and full-scale for acid mine water treatment. In this study, LDH-type materials were prepared in situ under different experimental conditions with a method for their separation also developed. This work demonstrated that an interlinked network of smaller LDH aggregates was formed during synthesis leading to the development of stable colloids. Different approaches were tested to separate the solid materials containing the captured contaminants from the solute. Polyelectrolytes adsorbed strongly on the particle networks causing charge neutralization and overcharging, however, destabilization of the stable dispersions was unsuccessful. Diluting the stable dispersions led to rapid sedimentation and separation of the LDH, which facilitated higher solute recoveries.

Graphical abstract: Contaminant removal by efficient separation of in situ formed layered double hydroxide compounds from mine wastewaters

Supplementary files

Article information

Article type
Paper
Submitted
12 9 2019
Accepted
23 10 2019
First published
24 10 2019
This article is Open Access
Creative Commons BY license

Environ. Sci.: Water Res. Technol., 2019,5, 2251-2259

Contaminant removal by efficient separation of in situ formed layered double hydroxide compounds from mine wastewaters

Z. Somosi, S. Muráth, P. Nagy, D. Sebők, I. Szilagyi and G. Douglas, Environ. Sci.: Water Res. Technol., 2019, 5, 2251 DOI: 10.1039/C9EW00808J

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