Conversion of potassium dichromate solution to a less toxic solution
That looks like one way to reduce the dichromate ion which is known to be toxic. MSDS sheets indicate that potassium dichromate has category 1B carcinogenicity.

Another way I believe is to just start from an aldehyde and convert it into a carboxylic acid: 

$$\ce{3RCHO + 2Cr_2O_7^- + BH^+ -&gt; 3RCOOH + 2Cr^{3+} + 4H_2O} $$

Alternatively, one can put dichromate in acidic solution with iron:

$$\ce{Cr2O7^{2-} + 6Fe^{2+} + 14 H^+ -&gt; 2 Cr^{3+} + 6 Fe^{3+} + 7H_2O }$$

Dichromate oxidizes $ \ce{Fe^{2+}}$ ions and produces $\ce{Cr^{3+}}$ and $\ce{Fe^{3+}}$ ions.