Partial desalination of seawater for mining processes through a fluidized bed bioreactor filled with immobilized cells of Bacillus subtilis LN8B

Arias, Dayana; Villca, Grecia; Pánico, Antonio; Cisternas, Luís A.; Jeldres, Ricardo I.; Benito, Gerardo González; Rivas, Mariella

doi:10.1016/j.desal.2020.114388

Cited by 18 publications

(7 citation statements)

References 34 publications

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“…To obtain pretreated seawater by biomineralization (BSw), the concentrations in raw seawater of Ca 2+ and Mg 2+ were reduced through precipitation by the ureolytic bacterial strain B. subtilis LN8B, isolated from the hypersaline lagoon of the desert of San Pedro de Atacama, Chile [21]. BSw was obtained from bioreactors filled with polyvinyl alcohol and alginate beads (PVA-Alg beads) with entrapped cells of B. subtilis LN8B, according to the experimental system and procedure as described by Arias et al [18].…”

Section: Pretreated Seawater By Biomineralizationmentioning

confidence: 99%

“…Per mole of urea, urease enzyme hydrolyzes urea into one mole of carbonate ion and two moles of ammonium ion. Carbonate ions precipitate as calcium carbonate in the presence of calcium ions from seawater, decreasing its concentration as a soluble ion [18]. On the other hand, NH 4 + ions can remain in solution or form precipitates as struvite or another crystal, helping to reduce the soluble concentration of Mg 2+ from seawater [36].…”

Section: Calcium and Magnesium Influence In Settling Rate (Sr) And Turbidity (T)mentioning

confidence: 99%

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Use of Radial Basis Function Network to Predict Optimum Calcium and Magnesium Levels in Seawater and Application of Pretreated Seawater by Biomineralization as Crucial Tools to Improve Copper Tailings Flocculation

et al. 2020

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The combined use of the Radial Basis Function Network (RBFN) model with pretreated seawater by biomineralization (BSw) was investigated as an approach to improve copper tailings flocculation for mining purposes. The RBFN was used to set the optimal ranges of Ca2+ and Mg2+ concentration at different Ph in artificial seawater to optimize the performance of the mine tailings sedimentation process. The RBFN was developed by considering Ca2+ and Mg2+ concentration as well as pH as input variables, and mine tailings settling rate (Sr) and residual water turbidity (T) as output variables. The optimal ranges of Ca2+ and Mg2+ concentration were found, respectively: (i) 169–338 and 0–130 mg·L−1 at pH 9.3; (ii) 0–21 and 400–741 mg·L–1 at pH 10.5; (iii) 377–418 and 703–849 mg·L−1 at pH 11.5. The settling performance predicted by the RBFN was compared with that measured in raw seawater (Sw), chemically pretreated seawater (CHSw), BSw, and tap water (Tw). The results highlighted that the RBFN model is greatly useful to predict the settling performance in CHSw. On the other hand, the highest Sr values (i.e., 5.4, 5.7, and 5.4 m·h–1) were reached independently of pH when BSw was used as a separation medium for the sedimentation process.

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Section: Pretreated Seawater By Biomineralizationmentioning

confidence: 99%

Section: Calcium and Magnesium Influence In Settling Rate (Sr) And Turbidity (T)mentioning

confidence: 99%

Use of Radial Basis Function Network to Predict Optimum Calcium and Magnesium Levels in Seawater and Application of Pretreated Seawater by Biomineralization as Crucial Tools to Improve Copper Tailings Flocculation

et al. 2020

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“…The authors considerably increased the sedimentation rate of mineral tailings at pH 11, obtaining higher values than at natural pH. More recently, Arias et al [ 27 ] proposed a biotechnological treatment to remove divalent ions from seawater, using a fluidized bed bioreactor completed with the halotolerant ureolytic strain Bacillus subtilis LN8B. These latest studies [ 26 , 27 ] have yielded promising results in reducing magnesium in seawater, opening up a new line of research that needs to be explored systematically.…”

Section: Introductionmentioning

confidence: 99%

Lime/Sodium Carbonate Treated Seawater to Improve Flocculation and Sedimentation of Clay-Based Tailings

et al. 2021

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Seawater treated with lime and sodium carbonate in different proportions to reduce magnesium and calcium contents is used in flocculation and sedimentation tests of artificial quartz and kaolin tailings. Solid complexes were separated from water by vacuum filtration, and factors such as lime/sodium carbonate ratio, kaolin content, flocculation time, and flocculant dose are evaluated. The growth of the aggregates was captured in situ by a focused beam reflectance measurement (FBRM) probe. Solid magnesium and calcium complexes are formed in raw seawater at pH 11, impairing the performance of flocculant polymers based on polyacrylamides. The results show that the settling rate improved when the treatment’s lime/sodium carbonate ratio increased. That is, when a greater removal of magnesium is prioritized over calcium. The amount of magnesium required to be removed depends on the mineralogy of the system: more clay will require more significant removal of magnesium. These results respond to the structural changes of the flocs, achieving that the more magnesium is removed, the greater the size and density of the aggregates. In contrast, calcium removal does not significantly influence flocculant performance. The study suggests the necessary conditions for each type of tailing to maximize water recovery, contributing to the effective closure of the water cycle in processes that use seawater with magnesium control.

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“…Therefore, the use of ANNs has been proposed as a good alternative to PMs in mineral processing (Lucay et al, 2020). Several other works have shown that ANNs are an adequate tool for RSM (Arias et al, 2020(Arias et al, , 2018Xiao and Zhu, 2010;Yadav et al, 2018Yadav et al, , 2017Zulfiqar et al, 2019). Thus, this work aimed to study the use of Na2SO3 as a pyrite depressant in the presence of chalcopyrite and kaolinite in saline media of NaCl and KCl.…”

Section: Introductionmentioning

confidence: 99%

On the use of Na<sub>2</sub>SO<sub>3</sub> as a pyrite depressant in saline systems and the presence of kaolinite

Arancibia-Bravo¹,

Lucay²,

Sepúlveda³

et al. 2021

Physicochem. Probl. Miner. Process.

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Partial desalination of seawater for mining processes through a fluidized bed bioreactor filled with immobilized cells of Bacillus subtilis LN8B

Cited by 18 publications

References 34 publications

Use of Radial Basis Function Network to Predict Optimum Calcium and Magnesium Levels in Seawater and Application of Pretreated Seawater by Biomineralization as Crucial Tools to Improve Copper Tailings Flocculation

Use of Radial Basis Function Network to Predict Optimum Calcium and Magnesium Levels in Seawater and Application of Pretreated Seawater by Biomineralization as Crucial Tools to Improve Copper Tailings Flocculation

Lime/Sodium Carbonate Treated Seawater to Improve Flocculation and Sedimentation of Clay-Based Tailings

On the use of Na<sub>2</sub>SO<sub>3</sub> as a pyrite depressant in saline systems and the presence of kaolinite

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