Anaerobic treatment of Polyethylene Terephthalate (PET) wastewater from lab to full scale

In the last decade Polyethylene Terephthalate (PET) production is growing. The wastewater of the "Catalana de Polimers" factory in Barcelona (Spain) h as two main streams of similar flow rate, esterification (COD=30,000 mg/l) and textile (COD=4000 mg/l). Tn order to assess the anaerobic treatment via bility, discontinuous and continuous experiments were carried out. Disconti nuous biodegradability tests indicated that anaerobic biodegradability was 90 and 75% for esterification and textile wastewater. The textile stream re vealed some tendency to foam formation and inhibitory effects. Nutrients, m icronutrients and alkali limitations and dosage were determined. A continuous lab-scale UASB reactor was able to treat a mixture of 50% (v) esterification/textile wastewater with stable behaviour at organic loading rate larger than 12 g COD/l.d (0.3 g COD/g VSS.d) with COD removal efficien cy greater than 90%. The start-up period was very short and the recuperatio n after overloading accidents was quite fast, in spite of the wash-out of s olids. From the laboratory information an industrial treatment plant was de signed and built, during the start-up period COD removal efficiencies large r than 90% and organic loading rate of 0.6 kg COD/kg VSS.d (5 kg COD/m(3).d ) have been reached. (C) 1999 IAWQ Published by Elsevier Science Ltd. All r ights reserved.