Patent ID: 6682653
Filing Date: 2004-01-27
Classification: C02F,Y02W

Abstract:
A process for purifying refractory wastewater or raw water for drinking water, comprising:treating refractory wastewater or raw water in a floated biological treatment apparatus, wherein the refractory wastewater and raw water contain less than 200 mg/l of SS and have a COD less than 1000 mg/l and have a NH3-N less than 200 mg/l, wherein the floated biological treatment apparatus is divided into upper and lower portions by a supporting plate, the upper portion formed into a reactor, the reactor filled with porous compressible polymer carriers in an amount of 80 vol % to 100 vol % of the reactor volume, the carrier adhered with microorganisms and in a floating state, wherein the carriers are retained in the reactor by the supporting plate without falling to the lower portion of the apparatus.