Simultaneous removal of chromium(VI) and fluoride by electrocoagulation–electroflotation: Application of a hybrid Fe-Al anode

Aoudj, S.; Khelifa, A.; Drouiche, Nadjib; Belkada, Rachid; Miroud, Djamel

doi:10.1016/j.cej.2014.12.081

Cited by 198 publications

(47 citation statements)

References 58 publications

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“…Under pH conditions below 7.0, higher F-removals were attained. Another feature is that when Fe electrodes were used, a decay on the removal efficiencies was observed [49,107,182]. This trend is related with the particular mechanism of fluoride removal by EC, which occurs mainly by the formation of highly insoluble aluminum fluoride.…”

Section: Non-metallic Inorganic Speciesmentioning

confidence: 92%

“…The mechanisms involved in EC are not clearly understood yet [27], but during the last decade several researchers [47][48][49] have tried to elucidate the mechanisms involved during the removal of pollutants. This subsection presents a brief overview to give an insight on the most important mechanisms considered during EC for removing pollutants from water, which are summarized in Fig.…”

Section: Pollutants Removal Mechanismsmentioning

confidence: 99%

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Electrocoagulation and advanced electrocoagulation processes: A general review about the fundamentals, emerging applications and its association with other technologies

Garcia‐Segura

Eiband

Melo

et al. 2017

Journal of Electroanalytical Chemistry

574

213

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The electrocoagulation (EC) process is an electrochemical means of introducing coagulants and removing suspended solids, colloidal material, and metals, as well as other dissolved solids from water and wastewaters. EC process has been successfully employed in removing pollutants, pesticides, and radionuclides. This process also removes harmful microorganisms. More often during EC operation, direct current is applied and electrode plates are sacrificed (dissolved into solution). The electrodissolution causes an increased metal concentration in the solution that finally precipitates as oxides and hydroxides. Due to the process design and low cost material, the EC process is widely accepted over other physicochemical processes. In this frame, this paper presents a general review of efficient EC technologies developed to remove organic and inorganic matter from wastewaters for environmental protection. Fundamentals and main applications of EC as well as progress of emerging EC treatments are reported. The influence of iron or aluminum anode on depollution of synthetic or real effluents is explained. The advantages of EC mechanisms with Al and Fe electrodes are extensively discussed. There are presented the advanced EC processes with in situ generation of hydroxyl radical. The importance of the operating parameters for efficient application of the EC process as well as the combination of this electrochemical technology with electroanalysis techniques and other technologies are commented.

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Section: Non-metallic Inorganic Speciesmentioning

confidence: 92%

Section: Pollutants Removal Mechanismsmentioning

confidence: 99%

Electrocoagulation and advanced electrocoagulation processes: A general review about the fundamentals, emerging applications and its association with other technologies

Garcia‐Segura

Eiband

Melo

et al. 2017

Journal of Electroanalytical Chemistry

574

213

View full text Add to dashboard Cite

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“…The feasibility of electroflotation applied to water and industrial wastewaters treatment has been demonstrated by several authors (Aoudj et al, 2015;Casqueira et. al., 2006;Nahui et al, 2008;Vu et al, 2014); however, there is little information in the literature about the use of electroflotation for phosphate recovery from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Electroflotation of precipitated phosphate from synthetic solution

Cruz

Monte

Dutra

2017

Braz. J. Chem. Eng.

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-The phosphate recovery from a 20 mg L -1 Na2HPO4 solution through precipitation with Ca(OH)2 followed by electroflotation was evaluated. X-ray diffraction and particle size measurements indicated that the precipitates were a mixture of hydroxyapatite and calcium-deficient hydroxyapatite, with size ranging from 3 to 10 mm. Electroflotation with Na-oleate as surfactant was used to recover the precipitates. The surfactant adsorption was evaluated through zeta potential measurements. The influence of Na-oleate concentration, pH and bubble size on phosphate recovery was investigated. In the absence of Na-oleate, a phosphate recovery of 50% was achieved, while in the presence of 20 mg L -1 of Na-oleate it was increased to 90%, at pH 11. The phosphate recovery also increased with Ca(OH)2 concentration increase and bubble size decrease, reaching 100% at 300 mg L -1 Ca(OH)2 and bubble size around 39 µm.

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“…Consequently, polymeric Al, i.e., Al b or Al 13 , was inferred to play an important role in the removal of fluoride by Al salts over wide pH range from 4 to 9, and their fluoride removal efficiency increased in the order: PACl 2 > PACl 1 > AlCl 3 . Aoudj et al reported that simultaneous removal of chromium (VI) and fluoride by electrocoagulation-electroflotation: application of a hybrid Fe-Al anode and showed that fluoride removal was mainly ascribed to aluminum plates not to iron plates [28]. Liu et al reported simultaneous removal of arsenate and fluoride by iron and aluminum binary oxide and experimental result revealed that iron oxyhydroxide (FeOxHy) showed a high removal capability towards As(V) but exhibited little efficacy to remove F in systems where both As(V) and F co-exist or for solutions of fluoride alone and AlOxHy may simultaneously remove As(V) and F over a wide pH range from 4 to 11 [29].…”

Section: Removal Efficiency Of Fluoride By Different Al Coagulantsmentioning

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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Simultaneous removal of chromium(VI) and fluoride by electrocoagulation–electroflotation: Application of a hybrid Fe-Al anode

Cited by 198 publications

References 58 publications

Electrocoagulation and advanced electrocoagulation processes: A general review about the fundamentals, emerging applications and its association with other technologies

Electrocoagulation and advanced electrocoagulation processes: A general review about the fundamentals, emerging applications and its association with other technologies

Electroflotation of precipitated phosphate from synthetic solution

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

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