| abstract |
There is disclosed a treatment process for removing insoluble aromatic acids, heavy metal oxidation catalysts, metal impurities, from waste water generated in an aromatic acid production process. The treatment process comprises the steps of: (a) filtering the waste water to recover the insoluble aromatic acids; (b) passing the filtrate of step (a) through an ion exchange resin to selectively remove at least one heavy metal impurity; and (c) passing the effluent of step (b) through an ion exchange resin to selectively remove said oxidation catalysts. |