Treatment of acid mine drainage by forward osmosis: Heavy metal rejection and reverse flux of draw solution constituents

Vital, Bárbara; Bartacek, Jan; Ortega-Bravo, J.C.; Jeison, David

doi:10.1016/j.cej.2017.09.034

Cited by 127 publications

(43 citation statements)

References 33 publications

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“…There are many well-known processes regarding the treatments of contaminated wastewaters like membrane filtration, 1-4 chemical precipitation, [5][6][7] electrocoagulation, [8][9][10][11][12] reverse osmosis, [13][14][15] adsorbtion, [16][17][18][19][20][21][22][23][24] ion exchange, [25][26][27] etc., all of them with their inherent advantages and disadvantages. At the same time, most of them are not suitable for developing countries due to huge cost investment in terms of use of chemicals, infrastructure, and operation.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal adsorption ability of a new composite material based on starch strengthened with chemically modified cellulose

Anghel¹,

Niculaua

Spiridon³

2019

Polymers for Advanced Techs

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Adsorption of heavy metals (Pb, Zn, and Cu) on a new bioadsorbent based on starch reinforced with modified cellulose with toluene‐diisocyanate has been studied using batch‐adsorption technology. The study was carried out in order to find if this bio material, designed for seedling pots manufacture, is able to act like a barrier between soil pollutants and plants. The influence of contact time, pH, adsorbent dose, and salt concentrations was also evaluated. The obtained data were examined using the Langmuir and Freundlich adsorption models. Optimal results were obtained at pH 5.0, temperature of 25°C, contact time of 120 minutes, and an adsorbent dose of 4 mg/mL. Experimental data along with computed Langmuir parameters show that the adsorption process is favorable, and the maximum adsorption capacity of the adsorbent for lead, zinc, and copper was 66.66, 58.82, and 47.61 mg/g, respectively.

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Section: Introductionmentioning

confidence: 99%

Heavy metal adsorption ability of a new composite material based on starch strengthened with chemically modified cellulose

Anghel¹,

Niculaua

Spiridon³

2019

Polymers for Advanced Techs

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“…The percolate solution was prepared with anhydrous Na 2 SO 4 and CuSO 4 using distilled water 17 , with concentrations of 600 and 4,300 mg/L, respectively. These concentrations were set based on values usually found for AMD in copper mining 7,11 .…”

Section: Methodsmentioning

confidence: 99%

Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage

Farage

Quina

Gando-Ferreira

et al. 2020

Sci Rep

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Mining is an essential human activity, but results in several environmental impacts, notably the contamination of ground and surface water through the presence of toxic substances such as metals and sulfates in mine drainage. permeable reactive barriers (pRB) have been applied to remediate this environmental impact, but the high costs associated with the maintenance of this system are still a challenge. the main objective of this study was to evaluate the use of kraft pulp mill alkaline residues, known as dregs and grits, as material for pRB, and to determine their capacity for retaining copper and sulfate. the work was carried out in laboratory adsorption kinetics assays, batch assays and column tests. tests for elemental characterization, point of zero charge, acid neutralization capacity, total porosity, bulk density and moisture of the dregs and grits were conducted. the results showed high retention of Cu due to a chemical precipitation mechanism, notably for dregs (99%) at 5 min in adsorption kinetics. The grits presented similar results after 180 min for the same assay. Sulfate retention was effective at pH below 5, with an efficiency of 79% and 89% for dregs and grits, respectively. Dregs presented the best results for acid drainage remediation, notably with a solid:liquid (S:L) ratio of 1:10.Acid mine drainage (AMD) is caused by the oxidation of sulfur-bearing materials in the presence of oxygen and water, resulting in sulfate and metals solubilization and forming acidic solutions 1-4 . Active and inactive mining activities for metals, such as copper, lead, zinc, gold, silver and uranium, provoke potential degradation of the environment by the presence of different contaminants, particularly due to metals and sulfates in acid drainage 5 . Indeed, the acid drainage formation is an important environmental aspect of mining practices. The sulfate concentrations may reach 2,400 to 20,800 mg/L 6,7 , well above the limit of 250 mg/L established by the World Health Organization 8 . It might cause damage not only to human health but also to the environment, and depreciation of structures and equipment 2,9 , resulting in high costs for control and management by the mining companies 2,10 . Copper concentration may be in the range from 77 to 615 mg/L, with higher values in the Cu mines 1,11 . Other metals such as Al, Mn, Fe, Mg, and Zn are also commonly found in AMD in these mines 10,12 .AMD remediation can be actively accomplished off-site with the pumping of the contamination plume to a treatment plant, or passively on-site with the use of permeable reactive barriers (PRB), with lower installation and maintenance costs. It can be carried out with the flow directed to the system, by the Funnel model, or the grid-type, by the installation of a perpendicular barrier to the contamination plume 13,14 . The PRB was first proposed in Canada in the 1990s 13,15 , with different materials used as adsorbent media, from single barriers with only one material to composites of different materials, or multiple sequential barrier...

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“…Figure 8 shows the XRD patterns of the BSC before the reaction, BSC after the reaction, and the precipitate generated after the reaction. According to (a), the mineral phases of BSC before the reaction are mainly CaCO 3 10 is generated by Pb 2+ , OH − , and silicate ions; and Ca 2 PbO 4 and Na 6 PbO 5 are generated by the thermal decomposition of compounds generated by Ca 2+ , Na + , Pb 2+ , and OH − reactions. According to (c), the reaction precipitates are mainly PbCO 3 , Pb 4 (SO 4 )(CO 3 ) 2 (OH) 2 , Pb 3 (CO 3 ) 2 (OH) 2 , and Pb 3 (CO 2 ) 2 (OH) 2 .…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…In addition, groundwater pollution due to AMD is a serious problem too. To mitigate the negative effects of AMD on ecosystems and human health, several treatment approaches have been developed, including neutralization precipitation [7], electrochemical [8], membrane separation [9,10], microbial treatment [11,12], constructed wetland [13], and adsorption [14] methods. Among these, the neutralization precipitation and adsorption methods [15,16] are widely used.…”

Section: Introductionmentioning

confidence: 99%

Removal of Pb(II) from Acid Mine Drainage with Bentonite-Steel Slag Composite Particles

2019

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Abandoned lead and zinc (Pb-Zn) mines around the world produce large amounts of acid mine drainage (AMD) containing Pb(II), which is toxic and accumulates in the environment and in living organisms. Bentonite-steel slag composite particles (BSC) are a new type of acid mine drainage (AMD) treatment material that can remove heavy metal ions and reduce acidity. To date, there have been no reports on the treatment of Pb(II)-containing AMD using BSC. Therefore, the effects of pH, reaction time, temperature, and Pb(II) concentration on the adsorption of Pb(II) onto BSC were studied. Moreover, the BSC before and after the reaction, as well as the precipitation after the reaction, were characterized by scanning electron microscopy and X-ray diffraction analyses. The effect of pH on the adsorption process is similar to that of the formation of soluble and insoluble hydrolysates of Pb(II) on pH. The adsorption mechanism includes ion exchange, complexation, precipitation, and synergistic adsorption–coagulation effect. Adsorption kinetics are best-fit with the pseudo-second order kinetics model ( R 2 > 0.98). Furthermore, the total adsorption rate is controlled by liquid film diffusion and in-particle diffusion, the liquid film diffusion rate being higher than the in-particle diffusion rate. The isothermal adsorption of Pb(II) onto BSC fit well with Langmuir and Brunauer Emmett Teller (BET) isotherms ( R 2 > 0.995), and both single layer adsorption and local multilayer adsorption were observed. Thermodynamic analysis revealed that the adsorption process is spontaneous and endothermic, and that the degree of freedom increases with time. In summary, this study provides a theoretical basis for the use of BSC in treating AMD containing Pb(II).

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Treatment of acid mine drainage by forward osmosis: Heavy metal rejection and reverse flux of draw solution constituents

Cited by 127 publications

References 33 publications

Heavy metal adsorption ability of a new composite material based on starch strengthened with chemically modified cellulose

Heavy metal adsorption ability of a new composite material based on starch strengthened with chemically modified cellulose

Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage

Removal of Pb(II) from Acid Mine Drainage with Bentonite-Steel Slag Composite Particles

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