| 摘要 |
<p>The invention relates to a method for purifying coke waste water that is charged with nitrogen compounds, cyanides and sulfides. According to the inventive method, the coke waste water passes through a reactor ( 3 ) that is integrated into a liquid cycle ( 2 ) and that comprises at least one gas-permeable membrane tube ( 5 ) whose interior is impinged upon by an oxygenous pressurized gas ( 4 ). On the exterior of the membrane tube ( 5 ) which is immersed in the liquid, a biofilm ( 6 ) is maintained in whose inner region ( 7 ) rich in oxygen due to the gas-permeability of the membrane tube ( 5 ) nitrogenous compounds are selectively nitrified to nitrates while at the same time nitrates are denitrified to elemental nitrogen in an oxygen-poor outer region ( 8 ) of the biofilm ( 6 ).</p> |
