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Open AccessArticle

Salts Removal from Synthetic Solution-Potash Brine by Non-Planted Constructed Wetlands

Environmental Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Alan Howard
Water 2016, 8(4), 113;
Received: 8 February 2016 / Revised: 13 March 2016 / Accepted: 21 March 2016 / Published: 24 March 2016
(This article belongs to the Special Issue Constructed Wetlands Systems and Management)
Four pilot-scale non-planted constructed wetlands (CWs) were employed to study the fate and transport of the two dominant chloride salts contained in brine resulting from solution mining activities in the potash industry. The simulated brine contained a 10:1 ratio of NaCl:KCl based on authentic brine characteristics. The multi-layer soils functioned as a main salt filtering component comprising of Regina Clay, sand and gravels. The CW systems were operated in three batches of 16 days (experiments 1–3). K+ ions were removed by 92% (4.6 mg/L) from the effluent, while Cl and Na+ were removed in lower proportions of 51% (85.3 mg/L) and 45% (53.2 mg/L), respectively. Over time, the retained quantities of the three target salt ions decreased, indicating that clay sorption capacity may have been reached. This study demonstrated that Regina Clay has substantial sorbent capacity for salt ions contained in simulated potash brine solution. View Full-Text
Keywords: chloride salts; constructed wetland; brine treatment; Regina Clay chloride salts; constructed wetland; brine treatment; Regina Clay
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Chairawiwut, W.; McMartin, D.W.; Azam, S. Salts Removal from Synthetic Solution-Potash Brine by Non-Planted Constructed Wetlands. Water 2016, 8, 113.

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