Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation

Liu, Ruiping; Bao, Liu; Zhu, Lijun; He, Zan; Ju, Jiawei; Lan, Huachun; Liu, Huijuan

doi:10.1016/j.jes.2014.10.024

Cited by 18 publications

(6 citation statements)

References 20 publications

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“…Monomeric Al is the dominant Al species in AlCl 3 solution. In case of acidic pH and high [F] 0 , the formation of Al-F complexes between soluble Al and fluoride is significant [5,36,37], and this effect inhibits Al polymerization and the removal of fluoride therafter. At elevated pH of 6-7, monomeric Al and Al-F complexes tend to precipitate with OH À , and Al-F coprecipitation contribute most to fluoride removal.…”

Section: Proposed Mechanism Of Fluoride Removal By Different Al Speciesmentioning

confidence: 99%

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Lan

Gong

et al. 2016

Separation and Purification Technology

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a b s t r a c tThis study investigates the effects of aluminum (Al) and F interactions on the coagulation behaviors of Al salts, i.e., AlCl 3 and polymer aluminum chloride (PACl) at different basicity (B) towards fluoride. These coagulants achieve the optimum fluoride removal over pH 6-7, and PACl exhibits higher removal efficiency than AlCl 3 does over pH 4-9. The removal of fluoride is positively correlated with the content of either Al 13 or Al b in Al-based coagulants over pH 4-9 and increases in the order: PACl 2 > PACl 1 > AlCl 3 . As for PACl, the increased B from 0 to 2.4 improves fluoride removal owing to the elevated ratios of Al b . However, at further increased B to 2.8, the formation of colloidal Al species

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Section: Proposed Mechanism Of Fluoride Removal By Different Al Speciesmentioning

confidence: 99%

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Lan

Gong

et al. 2016

Separation and Purification Technology

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“…Among the various types of water pollutants, heavy metals are among the most important due to their toxicity, stability, resistance to environmental degradation, and long-term accumulation in the food chain. The most dangerous ions for human health and other living organisms are Cr, Fe, Se, V, Cu, Co, Ni, Cd, Hg, As, Pb, and Zn [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Biological Treatment of Heavy Metals with Algae

Mohammadi,

Mahmoudnia

2023

Heavy Metals - Recent Advances

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The development of industrial activities has caused an increase in the production of various water pollutants, of which heavy metals are among the most important due to their toxicity and harmful environmental effects. Bioabsorption is a promising and environmentally friendly technology, which has been widely used in various wastewater treatment applications in recent years. Among the bioabsorbents, algae are particularly important due to their high absorption efficiency, availability, and cost-effectiveness. In this chapter, the advantages of using algae and their use as biosorbents for removing heavy metals such as copper, aluminum, cadmium, zinc, mercury, chromium, nickel, and lead from aqueous solutions have been investigated. The effect of various factors, including factors related to biomass and process conditions (solution pH, adsorbent dosage, contact time, temperature, and initial concentration of heavy metal ions) has been evaluated. Also, the mechanisms of biological absorption of heavy metal ions in algae have been analyzed. Numerous studies show that algae are effective and economic bioabsorbents for the removal of heavy metals from industrial wastewater, and due to their predictability with simple equilibrium and kinetic mathematical equations, they are suitable for large-scale applications in continuous processes.

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“…Currently, the main technologies that remove fluorides, include reverse osmosis, 8,9 nanofiltration, 10–12 precipitation-coagulation, 13,14 electrocoagulation, 15–17 adsorption 5,18,19 and ion-exchange. 20,21 The first three methods are rarely used for fluoride removal because of unmet discharge requirements, membrane pollution, and cumbersome treatment.…”

Section: Introductionmentioning

confidence: 99%

Goethite/montmorillonite adsorption coupled with electrocoagulation for improving fluoride removal from aqueous solutions

Kang

et al. 2022

RSC Adv.

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Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation

Abstract: This study focuses on the effects of pH and fluoride at different molar ratios of fluoride to Al i.e., aluminum (Al) hydro(oxide) with adsorbed fluoride at R F:Al of below 0.1:1, may be reclaimed as a coagulant after being dissolved.

Cited by 18 publications

References 20 publications

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Biological Treatment of Heavy Metals with Algae

Goethite/montmorillonite adsorption coupled with electrocoagulation for improving fluoride removal from aqueous solutions

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