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Dimethyl arsenate removal from an effluent wastewater stream

Dimethyl arsenate removal from an effluent wastewater stream

(OP)
Hi,

Does anyone here have any experience in treating Dimethyl arsenate from an effluent stream? Concentration: ~ 1000 - 1500 ppb, has a bunch of other heavy metals as well. Like is there an effective (in terms of kinetics) way to first reduce and then demethylate MAs(V) to As(III) (reducing agents, bacteria?) ?
Then, perhaps it could be oxidized to As(V) and later precipitated with FeCl2.

Or would a CASP/MBR system work for this effluent stream ?

Any thoughts?


Thank you in advance for your help.

RE: Dimethyl arsenate removal from an effluent wastewater stream

For the heavy metals, have you considered liquid liquid extraction with an organo phosphorus derivative - the chemistry wizards at Cytec Industries, USA may be able to help with the Cyanex 200 / 300 / 900 series extraction solvents. Literature I have indicates these solvents work at pH<6 or so, but they may have others that work at pH=7.

RE: Dimethyl arsenate removal from an effluent wastewater stream

A more conventional route may be cationic - anionic exchange resins which are selective for these heavy metals and arsenate.

RE: Dimethyl arsenate removal from an effluent wastewater stream

Forget about liquid/liquid extraction for tiny concentrations like this. Arsenic removal from drinking water is well studied and there is plenty of literature for you to review.

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