Processing of arsenic waste by precipitation and solidification

Palfy, Pavol; Vircikova, E.; Molnar, L.

doi:10.1016/s0956-053x(99)00014-8

Cited by 56 publications

(31 citation statements)

References 8 publications

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“…The conventional methods to treat arsenic contaminated water is flotation (Bruckard et al 2007), precipitation (Palfy et al 1999), coagulation (Song et al 2006), flocculate with sulfide or ferric hydroxide (Balarama Krishna et al 2001), and filtration (Leupin and Hug 2005) and ion exchange (Kim and Benjamin 2004). These methods always need the pretreatment of oxidation of As(III) to As(V) and consume considerable amount of reagents to precipitate, coagulate and flocculate the contaminants and are not economical for treating large volume of dilute concentrations.…”

Section: Introductionmentioning

confidence: 99%

The characteristics of Escherichia coli adsorption of arsenic(III) from aqueous solution

Feng

et al. 2009

World J Microbiol Biotechnol

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The potential of using Escherichia coli (E. coli) as adsorbent for the adsorption of As(III) from aqueous solution was assessed. Various parameters like pH, initial concentration and temperature have been investigated. It is found that the adsorption of As(III) is pH dependent and the optimum value was 2.0. Kinetics studies revealed that the equilibrium of the adsorption of As(III) on to E. coli was obtained within 30 min and the process was followed with the pseudo-2nd-order kinetic model. The equilibrium adsorption data obtained at different temperatures were fitted better with Langmuir than Freundich isotherm. The adsorption capacity of E. coli for As(III) is increased with the increasing of temperature and the maximum adsorption capacity is 1.111 mg/g which obtained at 40°C. Potentiometric titration and Fourier transform infra-red spectroscopy were applied to reveal the mechanisms of the As(III) binding. Amino, amide, amine group and C-H of the alkane are determined to be involved in As(III) binding based on the results.

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Section: Introductionmentioning

confidence: 99%

The characteristics of Escherichia coli adsorption of arsenic(III) from aqueous solution

Feng

et al. 2009

World J Microbiol Biotechnol

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“…Pant). cement processes, lime-based technology, bituminization, emulsified asphalt processes, polyethylene extrusion and vitrification [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Solidification/stabilization of arsenic containing solid wastes using portland cement, fly ash and polymeric materials

Singh

Pant

2006

Journal of Hazardous Materials

230

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“…Arsenic organic and inorganic chemistry in soils was well described by Sadiq (1997). Guenegou et al (1997) Palfy et al (1999) demonstrated that it is possible to reduce the arsenic solubility of untreated waste sludges from 6430 mg L -1 to 0.823 mg L -1 by arsenic stabilization. In particular, arsenic was precipitated and immobilized by using ferric sulphate, calcium oxide and hydrogen peroxide to oxidize As(III) into As(V).…”

Section: Environmental Management and Sustainable Developmentmentioning

confidence: 95%

Removal of Arsenic from Wet Scrubbing Wastewater

Ferella

Michelis

Vegliò³

2016

EMSD

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Arsenic removal is hindered by its valence state. Addition of lime into wastewater containing arsenic gives benefits through the formation of low-soluble calcium arsenate, but the mechanism involved in the reduction of arsenic dissolution is not well known yet. Hence, in the present work different Ca/As ratios from 0 to 70% w/w were tested with the aim of finding the best conditions for removal of As from water (neutral tests) or solution (acid tests) containing sulphate ions. These solutions simulated aqueous streams coming from a wet scrubber for treatment of flue gas. Moreover, 5 g L -1 of iron chloride were tested as additive in the acid tests.In the optimum operating conditions, nearly 99% precipitation yield was obtained for both As(III) and As(V) in less than 1 h; the optimum process conditions were 10 g L -1 of CaO without FeCl 3 for As(III) and 9 g L -1 of CaO and 5 g -1 FeCl 3 for As(V) in acid solutions. As regards neutral solutions, 1 g L -1 of CaO is enough to precipitate around 99% of As(III) whereas the same result for As(V) is achieved by a higher CaO concentration (40 g L -1 ). Iron chloride had a negative effect on As(III) precipitation.

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Processing of arsenic waste by precipitation and solidification

Cited by 56 publications

References 8 publications

The characteristics of Escherichia coli adsorption of arsenic(III) from aqueous solution

The characteristics of Escherichia coli adsorption of arsenic(III) from aqueous solution

Solidification/stabilization of arsenic containing solid wastes using portland cement, fly ash and polymeric materials

Removal of Arsenic from Wet Scrubbing Wastewater

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