BIOLOGICAL DENITRIFICATION APPARATUS AND METHOD USING FLUIDIZED-BED REACTOR FILLED WITH ELEMENTAL SULFUR

摘要

The present invention relates to a biological denitrification apparatus and a denitrification method using a fluidized-bed reactor filled with elemental sulfur. The apparatus comprises: a reactor filled with elemental sulfur and limestone therein; an inlet port at a lower portion of the reactor for introducing the wastewater to flow from the lower portion to an upper portion of the reactor; a treated water sedimentation basin over the reactor for collecting the introduced water after passing through the reactor; a treated water recycle line between the treated water sedimentation basin and the inlet port of the reactor for recycling the treated water from the treated water sedimentation basin to the inlet port of the reactor; a pump mounted to an end of the treated water recycle line for increasing the flow rate of the recycled water; and a T-shaped precipitator at one end of the recycle line for precipitating suspended solids such as microbes contained in the treated water recycled to the reactor, in which the treated water sedimentation basin has a diameter at least twice that of the reactor in order to function as a sedimentation basin.