Removal of arsenic from water by electrocoagulation

Kumar, Pradeep; Chaudhari, Sanjeev; Khilar, Kartic C.; Mahajan, Surabhi

doi:10.1016/j.chemosphere.2003.12.025

Cited by 523 publications

(66 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Only the highest current density of 45 A m −2 was selected to exemplify the EC process for GW because the treatment time was relatively large (>15 min) when lower current densities were applied. These used current density values are consistent with those reported in the literature for this process (Kumar et al 2004;Yu et al 2005;Yilmaz et al 2005).…”

Section: Electrocoagulation Experimentssupporting

confidence: 83%

Improvement of Arsenic Electro-Removal from Underground Water by Lowering the Interference of other Ions

García-Lara

Montero‐Ocampo

2009

Water Air Soil Pollut

View full text Add to dashboard Cite

Electrocoagulation (EC) has been evaluated as a treatment technology for arsenic (As) removal. Experiments were developed in an electrochemical reactor with three parallel iron plates. Current densities of 15, 30, and 45 A m −2 were used to treat model water and 45 A m −2 to treat underground water (GW). For both types of water, the EC process was able to decrease the residual arsenic concentration to less than 10μg L −1 . However, the treatment time for As removal from GW was higher. This phenomenon was attributed to the competition of dissolved species present in GW such as silica and calcium with arsenic for the adsorption sites on the ferric oxyhydroxides flocs generated during the EC process. A procedure is proposed to reduce such interference by the addition of a silica adsorption inhibitor compound into the GW achieving a reduction in the process time. The adsorption of arsenic species over adsorbent was found to follow Lagergren adsorption model.

show abstract

Section: Electrocoagulation Experimentssupporting

confidence: 83%

Improvement of Arsenic Electro-Removal from Underground Water by Lowering the Interference of other Ions

García-Lara

Montero‐Ocampo

2009

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…In high voltages, size and growth rate of produced flocs increase and this in turn affects the efficiency of the process [19]. By electrical potential increase the amount of oxidized aluminum increases and consequently hydroxide flocs with high adsorption rate increase and this leads to an increase in the efficiency of pollutant removal [43]. On the other hand, by electrical current increase, the density of bubbles increases while their size decreases hence the flotation efficiency increases [44].…”

Section: Turbidity Removalmentioning

confidence: 98%

Excessive Turbidity Removal from Textile Effluents Using Electrocoagulation Technique

Islam

Rahman

et al. 2011

J. Sci. Res.

View full text Add to dashboard Cite

Textile industries are one of the largest and vital industrial sectors of Bangladesh with regard to earn foreign exchange and labor employment, providing 4.5 million jobs of which 80% are women and contributes 13% to GDP [1]. This industry involves processing or converting raw material into finished cloth materials employing various processes, operations and consumes large quantities of water and produces extremely polluting waste effluents mostly by dyes and chemicals [2]. These dyes and chemicals, originating from the various steps of production in textile industry, in water often causes it AbstractThe work was conducted for improving textile effluent quality via turbidity removal by electrocoagulation (EC) using aluminum sacrificial electrode. Effluents were treated at 30 minutes and 30 volts (30min-30V) and 60 minutes and 40 volts (60min-40V) condition in a 1000 ml reactor cell with anode distance of 4 cm. Prior to EC experiment, physico-chemical parameters of effluent were measured and turbidity level was found eight times higher than the Department of Environment (DoE) standard. Turbidity removal ranged from 53 to 96.2% and 58 to 97.5% for condition one and two, respectively. Dissolved oxygen (DO) increased satisfactorily for both conditions. Total operational cost ranged from 62.50 to 70.41 taka/m 3 at 30min-30V and 159.57 to 187.7 taka/m 3 at 60min-40V. Moreover, sludge formation ranged from 6.73×10 -4 to 8.41×10 -4 kg in first condition and 1.21×10 -3 to 1.5431×10 -3 kg in second one. So, EC treatment was very effective and capable of elevating quality of the textile wastewater effluent in terms of turbidity to discharge into inland surface water. During EC operation it was also possible to lessen the total cost in maximum removal by changing the operating condition and 30min-30V was enough to get environmental friendly solution. Results will encourage the industry-owner to treat polluted effluents by EC.

show abstract

“…Among the 11 chemical decontamination processes developed, the solubilization 12 of As, Cr, Cu, PCP and DF using alkaline solutions and a bio- 13 surfactant seemed to be very promising in terms of contaminant 14 removal efficiencies and operational costs. Indeed, Reynier et al [6] 15 highlighted that more than 60% of As, 32% of Cr, 77% of Cu and 87% 16 of PCP can be removed from contaminated soils after 3 leaching 17 steps of 2 h each carried out at 80 C with a pulp density fixed at 18 10% in the presence of sodium hydroxide (0.5 M) and a surfactant 19 ([BW] = 2%). For the DF, the removal yields ranged from 25 to 74% 20 depending on the nature of the soil and the initial contaminant 21 levels.…”

Section: Introductionmentioning

confidence: 99%

“…50 Therefore, it is best to oxidize As(III) to As(V) before precipitation 51 to obtain better removal rates as the solubility of As(V) is lower 52 than the solubility of As(III). To enhance the removal of chromium 53 from effluents, it is better to reduce Cr(VI) in Cr(III) as the solubility 54 of Cr(III) is lower than the solubility of Cr(VI) [16,17]. However, As 55 (V) and Cr(III) are the preponderant forms found in contaminated 56 soils and the chemical leaching processes developed allowed 57 the solubilization of As and Cr in their more easily forms to be 58 precipitated without any oxidation or reduction.…”

Section: Introductionmentioning

confidence: 99%

Treatment of contaminated soil leachate by precipitation, adsorption and ion exchange

Reynier

Coudert

Blais

et al. 2015

Journal of Environmental Chemical Engineering

View full text Add to dashboard Cite

Removal of arsenic from water by electrocoagulation

Cited by 523 publications

References 28 publications

Improvement of Arsenic Electro-Removal from Underground Water by Lowering the Interference of other Ions

Improvement of Arsenic Electro-Removal from Underground Water by Lowering the Interference of other Ions

Excessive Turbidity Removal from Textile Effluents Using Electrocoagulation Technique

Treatment of contaminated soil leachate by precipitation, adsorption and ion exchange

Contact Info

Product

Resources

About