Decontamination of a Radioactive Process Waste Water by Adsorbing Colloid Flotation

Shakir, K.; Aziz, Md. Abdul; Salama, H.N.; Benyamin, K.

doi:10.1080/10256018708623737

Cited by 7 publications

(1 citation statement)

References 11 publications

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“…ACF has also been used for the effective removal of toxic organic compounds, such as pentachlorophenol (Chaphalkar et al, 1994), trihalo-methane precursors (Gehr et al, 1993), or dyes (Sheu and Huang, 1987), as well as for the decontamination of radioactive process waste waters, where high removals of 60 Co were observed by using Co(OH) 2 as sorbent/coprecipitant (Shakir et al, 1987). A novel interfacial emulsion technique that uses the adsorptive power of the oil-water interface and segregates toxic metals, such as Cu(II), into a compact emulsion between water and a water-immiscible oil phase, was used in combination with an adsorbing colloid (A1(OH) 3 , Fe(OH) 3 ) (Shin and Choi, 1994).…”

Section: A Adsorbing Colloid Flotationmentioning

confidence: 99%

Removal of metal ions from dilute solutions by sorptive flotation

Zouboulis

Matis

1997

Critical Reviews in Environmental Science and Technology

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The removal of soluble ionic species, such as toxic metal cations or oxyanions, from dilute aqueous solutions, as most waste waters are, was investigated in laboratory-scale experiments (batch and continuous mode) by applying the sorptive flotation process. This method involves the preliminary abstraction or scavenging of metal ions using proper "sorbents", which exist at the fine or ultrafine particle-size range, followed by a subsequent flotation stage for the separation of metalloaded sorbent particles from the treated (cleaned) solution. The main flotation techniques for the generation of the necessary bubbles (dissolved air, dispersed, and electrolytic) were applied effectively. The examined sorbents for the initial stage of the process could be of either inorganic nature, conventional (powdered activated carbon and zeolites) or industrial solid byproducts originated in the mineral industry, or of a biological nature (biosorbents), such as those produced during fermentations, in sewage treatment plants (sludge), etc. As a result of the process application, purified water is produced (underflow) as well as a foam concentrate; the recovery and recycling of removed species is also possible from the latter, leading to an overall clean technology. If required, the sorbents may also be reused and recycled after the application of a suitable metal eluant, which can also be considered to reveal to a certain extent the disposal problem of solid wastes.

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