In Reply to: Phenol and BPA in water. How to clean it? posted by Verstrepen on 09/16/00 at 5:05 PM:
At the risk of stating the obvious, the first thing that comes to mind is finding a thermally stable aromatic compound which has negligible solubility in water and in which phenol and BPA are much better soluble than in water. In a contiuous counter current multi-cell configuration, mix the two liquids and separate them (gravity separation or cyclone). Take the phenol and BPA rich stream and distill the phenol and BPA off, posibly under reduced pressure. Re-cycle the cleaned solvent stream.
An other idea would be to pass your waste water through a bed of activated carbon. When the carbon is saturated, switch the waste water flow to a second bed and strip the phenol and BPA from the activated carbon bed with steam.
You might be able to increase the activity coefficient of the phenol in the water by making the water acidic and forcing the phenol into its un-ionised form in which it should more easily leave the water.
Willem van Krimpen