Membrane technology has become a dignified separation technology over the past decenniad. The main advantage of membrane technology is the fact that it works without the addition of chemicals, with a relative low energy use and easy and well-arranged process conductions.Membrane technology is a generic term for a number of different, very characteristic separation processes. These processes are of the same kind, because in each of them a membrane is used. Membranes are used more and more often for the creation of process water from groundwater, surface water or wastewater. Membranes are now competitive for conventional techniques. IWA-MTC2009, which is jointly organized by IWA and Tsinghua University, will be held in Beijing from Sep. 1 to 3, 2009. It will provide an excellent forum for scientists and professionals working in the membrane sector of the water industry to present their work and enlighten the ways to thinking membrane each other, and the Exhibition will be also performed for refreshing our mind in application of membrane technology.  Please  download 1st Announcement and Calls for Paper IWA-MTC 2009.pdf .