Patent ID: 6610205
Filing Date: 2003-08-26
Classification: C02F,Y02W,Y10S

Abstract:
A process for nitrifying and denitrifying an organic compounds-bearing waste water, which comprises making use of a microbe carrier composed of a water-swellable organic thermoplastic high molecular compound in both a nitrifying step and a denitrifying step, wherein the compound has, in a state of complete swelling in water, a water absorption rate as defined by the formula (1) being in the range of 50 to 3500%, a compressive yield stress as defined by the formula (2) being at least 1.0 MPa and a particle diameter being in the range of 1.0 to 30 mm;water absorption rate (%)={weight upon complete swelling in water (g)âˆ’bone dry weight (g)}Ã—100/bone dry weight (g)â€ƒâ€ƒ(1) &sgr;=F/A,â€ƒâ€ƒ(2) where &sgr; is the compressive yield stress (MPa) of the carrier;F is the compressive load (N) upon the compressive collapse of the carrier; and A is the projected area (mm2) of the carrier before compression test.