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      Mg/Al LDH Enhances Sulfate removal and Clarification of AMD Wastewater in Precipitation Processes

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          Abstract

          The sulfate removal from acid mine drainage (AMD) water (initial concentration: 5301 mg/L) was investigated by precipitation and/or adsorption using calcium hydroxide (Ca(OH) 2) and synthetic layered double hydroxide (LDH) of the Mg/Al type. The exclusive use of LDH efficiently removed sulfates (64.2% reduction); however, alteration of its structure was observed due to low pH. The use of Ca(OH) 2 in different doses calculated in relation to gypsum stoichiometry allowed to achieve an 86% removal of sulfates. Depending on the equilibrium pH, gypsum or ettringite were the main identified phases. The two-step removal, involving the use of Ca(OH) 2 followed by LDH, was less efficient than the use of the Ca(OH) 2/LDH mixture when the stoichiometric amount of Ca(OH) 2 in relation to gypsum was applied. The application of mixture resulted in a fast pH increase, which prevented destruction of the LDH structure. Most importantly, the use of mixture significantly reduced the sludge volume and enhanced its settling velocity.

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          High performance NiFe layered double hydroxide for methyl orange dye and Cr(VI) adsorption

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            Basic Properties of Mg2+1-xAl3+x Layered Double Hydroxides Intercalated by Carbonate, Hydroxide, Chloride, and Sulfate Anions

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              Removal efficiency of arsenate and phosphate from aqueous solution using layered double hydroxide materials: intercalation vs. precipitation

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                23 July 2019
                July 2019
                : 12
                : 14
                : 2334
                Affiliations
                [1 ]Department of Mineralogy, Petrography and Geochemistry; Faculty of Geology, Geophysics and Environmental, Protection; AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
                [2 ]Chemical Process Engineering, University of Oulu, P.O. Box 4300, FIN-90014 Oulu, Finland
                Author notes
                [* ]Correspondence: pmaziarz@ 123456agh.edu.pl
                Author information
                https://orcid.org/0000-0003-3773-7252
                https://orcid.org/0000-0001-6008-6916
                Article
                materials-12-02334
                10.3390/ma12142334
                6679161
                31340458
                8e9d86fb-2766-4dee-b3d8-4daf1fba3f50
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 10 July 2019
                : 22 July 2019
                Categories
                Article

                acid mine drainage water,sulfate,precipitation,layered double hydroxides,calcium hydroxide

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