A1 Journal article (refereed), original research

Systematic study on sulfate removal from mining waters by electrocoagulation


Open Access publication

Publication Details
Authors: Mamelkina Maria A., Tuunila Ritva, Sillanpää Mika, Häkkinen Antti
Publisher: Elsevier
Publication year: 2019
Language: English
Related Journal or Series Information: Separation and Purification Technology
Volume number: 216
Start page: 43
End page: 50
Number of pages: 8
ISSN: 1383-5866
eISSN: 1873-3794
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe201902043940

Abstract

The mining industry is known to be a major producer of sulfate-rich
waters that are harmful to aquatic systems, accelerate acid mine
drainage formation and hinder the reuse and recycling of process water.
In recent years, many treatment techniques have been studied and
developed to treat sulfate-rich streams. One such technique,
electrocoagulation (EC), was proposed as a possible alternative to
conventional treatment technologies. Electrocoagulation has been used
for the removal of nitrate, cyanide and toxic metals from mining waters,
but the information about sulfate removal is scarce. In this paper, the
results from a systematic study on sulfate removal by EC with iron
electrodes applying a 33-full factorial design are discussed.
The results show the leading role of applied current on sulfate
removal. In addition, the study concludes that the utilisation of iron
electrodes was more efficient in terms of sulfate removal comparing to
aluminium electrodes. The removal of sulfate was as high as 54 % and 10 %
using iron and aluminium electrodes respectively. Under the studied
experimental conditions, sulfate was proposed to be removed because of
particle charge neutralisation and enmeshment of the studied anion in
iron oxides and hydroxides.


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Last updated on 2020-20-03 at 10:03