Arsenic and fluoride removal by electrocoagulation process: A general review

Sandoval, Miguel A.; Fuentes, Rosalba; Thiam, Abdoulaye; Salazar, Ricardo

doi:10.1016/j.scitotenv.2020.142108

Cited by 142 publications

(55 citation statements)

References 137 publications

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“…It is worth mentioning that adsorption taking place substitution of hydroxide groups present in Al n (OH) 3n flocs by the fluoride ions is the most prevalent fluoride removal mechanism for the EC using aluminium anodes [36,41,42,44,[46][47][48][50][51][52][53]55,56,[60][61][62][63][64][65][66][67]. Coprecipitation of fluoride and hydroxide ions with aluminium ions to produce a precipitate, Al n F m (OH) 3n−m is another mechanism occurring together with the adso-rption [36,42,44,[46][47][48]50,53,55,56,68].…”

Section: Fluoride Removal Mechanismsmentioning

confidence: 99%

Electrocoagulation as a Promising Defluoridation Technology from Water: A Review of State of the Art of Removal Mechanisms and Performance Trends

Mousazadeh

Alizadeh

Frontistis

et al. 2021

Water

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Fluoride ions present in drinking water are beneficial to human health when at proper concentration levels (0.5–1.5 mg L−1), but an excess intake of fluoride (>1.5 mg L−1) may pose several health problems. In this context, reducing high fluoride concentrations in water is a major worldwide challenge. The World Health Organization has recommended setting a permissible limit of 1.5 mg L−1. The application of electrocoagulation (EC) processes has received widespread and increasing attention as a promising treatment technology and a competitive treatment for fluoride control. EC technology has been favourably applied due to its economic effectiveness, environmental versatility, amenability of automation, and low sludge production. This review provides more detailed information on fluoride removal from water by the EC process, including operating parameters, removal mechanisms, energy consumption, and operating costs. Additionally, it also focuses attention on future trends related to improve defluoridation efficiency.

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Section: Fluoride Removal Mechanismsmentioning

confidence: 99%

Electrocoagulation as a Promising Defluoridation Technology from Water: A Review of State of the Art of Removal Mechanisms and Performance Trends

Mousazadeh

Alizadeh

Frontistis

et al. 2021

Water

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“…Arsenic mostly occurs in the inorganic form in nature. Various research outcomes highlight that arsenic is a carcinogenic element if used in excess amount in drinking water [1][2][3][4]. Arsenate is less poisonous and eager to migrate than Arsenite.…”

Section: Introductionmentioning

confidence: 99%

“…Arsenate is less poisonous and eager to migrate than Arsenite. It is up to 60-99% of total arsenic present in water [2] [5][6][7][8]. World Health Organization's (WHO) drinkable water limit for arsenic is set to 10.0 µgL −1 which is not because of safe consumption of water containing less than that concentration of arsenic, but due to the difficulty of detection and removal of arsenic below that concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Consumption of arsenic content water has been reported for various health issues due to its toxicity and severe damage to human body, especially in southeastern countries including China, India, Pakistan and Bangladesh [9][10][11]. The health problems cannot be visible immediately as human body can absorb significant arsenic amount, which is more harmful because the health problems occur when the tolerance limit of arsenic content is attained [2][3] [12]. Arsenic consumption is a major cause for Prolonged illness including cardiovascular and mental retardant in children [13].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Preliminary Assessment of Fixed Adsorption Column for Arsenic (As) Removal Using Local Rice Husk

Qudoos

Almani

Mangi

et al. 2020

QUESTRJ

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Arsenic (As) being a carcinogenic element present in drinking water in the less developed areas in the deprived countries contributes to many infectious diseases. The removal of arsenic traces from water needs to have an easy and efficient way for poor countries. Concerning this, a low-cost bio-adsorbent from Rice husk is prepared to remove arsenic from groundwater. Preparation of the absorbent is performed by crushing, sieving, washing and drying the rice husk. The Arsenic present in groundwater samples before and after treatment were tested by Arsenic kit. Batch experiments were carried out with ten contaminated samples of groundwater from Indus river origin area (Nasarpur) to investigate the influence of operating parameters such as adsorbent bed height (ABH) and initial arsenic concentration and residence time(TR) on As removal efficiency using locally fabricated adsorption column. Environmental parameters such as pH, temperature, TDS, and EC were also determined. It was observed that the highest optimized removal efficiency of 90% was achieved at ABH 30 cm: residence time, 60 minutes for feed arsenic concentration of 80 ppb samples. These results suggest that this bio-adsorbent can provide an easy, efficient, and economical method for removing As ions from effluents and water resources.

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“…The precipitation method opens the floodgates to remove fluoride. Adsorption, ion exchange, electric flocculation, membrane technology, solvent extraction, and electro-adsorption were applied to remove fluoride from nature, life, and industries [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Ion exchange needs ion-exchange resin, which makes it easy to exchange fluoride in an ion exchange column.…”

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confidence: 99%