there was a national industrial wastewater treatment and engineering application of new technology and equipment seminar, in hangzhou, recently, where a hangzhou water treatment technology development center representative reported on the use of double-membrane methods to treat wastewater from printing and dyeing. it discussed current treatment problems and countermeasures and demonstrated the advantages and prospects of the new technology, by analyzing a 30,000-ton/day wastewater treatment system, in the city of foshan and a 5,000-ton/day system in zhejiang’s jiaming, from the angle of treated water quality, cost, and investment.