It is known that aluminium and iron can be removed by treating the solution with alum or Ferric chloride. In same way chromium is a pollutant from tanneries. Is it possible to remove it through coagulation?
A workmate uses electrocoagulation to remove chromium from the solution.
You may take a look:
DOI: 10.1016/j.jhazmat.2009.04.089
I concur with the ALUM treatment - the basis of playing around with Chromium oxidative state is what assists with coagulation and precipitation to remove it from the liquor. kindly refer to the following both;-
http://books.google.bi/books?hl=en&lr=&id=a53Z9sUKAdUC&oi=fnd&pg=PA1&dq=mwinyihija&ots=fZof2JpY0s&sig=3FF7wdmBXioml3GX-zx_hsEVECI&redir_esc=y#v=onepage&q=mwinyihija&f=false
Chromium(III) can be conveniently precipitated from aqueous solutions either as chromium(III) phosphate or as chromium(III) hydroxide. For answers dealing with reduction of Cr(VI) to Cr(III) you may refer to another question at this forum:
https://www.researchgate.net/post/Chromium_III_is_much_less_toxic_than_chromium_VI_Can_anyone_suggest_feasible_ways_of_converting_chromiumVI_TO_ChromiumIII/2
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