BDAT for thallium removal from FGD WW ?
BDAT for thallium removal from FGD WW ?
(OP)
What is the latest 2008 BDAT best demonstrated available technology to remove thallium Tl from the FGD wet scrubber wastewater stream?
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BDAT for thallium removal from FGD WW ?
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RE: BDAT for thallium removal from FGD WW ?
RE: BDAT for thallium removal from FGD WW ?
One biochemist suggested a a bioreactor can be configured to remove Tl, but the first stage needs a postive ORP and a different bactrial selection.
One german company indicated that the same processes that remove Hg will also remove Tl; they use activated carbon PAC injected upstream of teh FGD to remove Hg, so I assume they imply that PAC will also remove Tl.
RE: BDAT for thallium removal from FGD WW ?
RE: BDAT for thallium removal from FGD WW ?
When we commissioned a new bioreactor cell 2 wks ago with new activated carbon media it completely removed the Tl from that stream, so this suggests that activated carbon will remove Tl prior to being blinded with Ca. We will track the rate of blinding or scaling with Ca ; it seems that PAC injection upstream of the FGD may be the better route as that also prevents release of Hg to the stack gases ( prevents conversion to elemental Hg) and may also remove Tl,; german firm claim the metals Hg and Tl can be isolated in a small stream of PAC solids that can be selectively removed from other FGD solids and thus reduce magnitude of floc/ sludge that need to be landfilled as hazardous to less than 4% of all FGD solids .
RE: BDAT for thallium removal from FGD WW ?
Within the FGD the retention is higher and less PAC necessary to bind mercury and other heavy metals. This binding prevents re-emission.
Mercury has to be oxidized, with Thallium I do not know.
RE: BDAT for thallium removal from FGD WW ?
You are right- I just heard from Evonik that the PAC is ultra-fine and injected in the FGD slurry.It passes thru the FGD primary and secondary hydrocyclones and also past the primary clarifier, ultimately collected in a secondary filter.