Method for treating alkaline wastewater

摘要

The invention provides a method for the treatment of alkaline wastewater comprising sodium ions and organic impurities, the method comprising the steps of a) contacting part of the wastewater with a cation exchange resin to obtain an acidic wastewater portion, b) mixing the acidic wastewater portion and the remaining wastewater portion optionally in the presence of a neutralizing solution to obtain an effluent having a pH of 5 to 9, preferably 6 to 8, more preferably 6.5 to 7.5, more preferably 6.8 to 7.2 and c) reducing the amount of the organic impurities from the effluent.