Technology of wastewater treatment in polyester weight loss process

摘要

PURPOSE: Provided is a method for treating polyester weight loss wastewater which is highly concentrated alkali wastewater with pH 12 to 14, COD 10,000 ppm and BOD 40,000 ppm and contains non-degradable material such as terephthalic acid (TPA) and ethylene glycol (EG). CONSTITUTION: The method comprises the steps of (a) mixing the polyester weight loss wastewater with conventional dying wastewater with a mixing ratio of 1:6 to 1:12 to dilute the polyester weight loss wastewater and reduce BOD and COD load, (b) decomposing contaminants in the diluted wastewater using excess sludge generated from an aeration tank of a wastewater treatment plant or biomedia, and (c) treating the outflow of the step (b) with an aeration tank.