Study on Use of A Porous Ferrous Filter Material
    for Chromium RemovaI
   SUN Ying-xue1, XU Dong2
   (1. School of
    Environmental Scicnce and Engineering Lanzhou Railway University
    Lanzhou 730070, China; 2. Northwest China
   Municpal Eng Design and
    Research InStitute, Lanzhou 73000O, China)