Biofilm Reactor Containing Spiral Structure and Water Treatment Device Using the Same

The present invention provides a biofilm reactor comprising a spiral structure and a water treatment facility using the same. The biofilm reactor comprises an inlet pipe for supplying water, an air supply pipe for supplying air, and an outlet pipe for discharging the water and air that passed through the reactor, wherein the reactor is provided therein with a spiral structure for forming a spiral bubble flow passage from the air supply pipe to the outlet pipe such that the oxygen transfer rate is increased by inducing the flow of bubbles supplied from the air supply pipe and by increasing residence time of the bubbles. The biofilm reactor is advantageous in that microbes adhere to the spiral structure to form a biofilm on the spiral structure, thus realizing both microbe suspension growth and microbe adhesion growth conditions, and in that the concentration of dissolved oxygen in water can be effectively increased without using power to stir, and the concentration of microbes can be effectively increased and maintained.