Updated: July 2002

1. Outline

Wastewater treatment plants of a medium or small scale require a simple equipment composition and easy maintenance. The Moving-Bed type bioreactor has largely simplified the washing mechanism by washing filtering media parallelly to the reactor processing.

2. Reactor Mechanism

1) The wastewater is fed at the reactor top and flows downwards through the packed bed of solid grains (filtering media) with a several-millimeter diameter.
2) Flowing through the packed bed, the wastewater undergoes biological treatment by contacting the aeration air (process air), and SS is removed. Then the treated water is taken out from the side wall of the reactor.
3) Simultaneously with the wastewater being treated, air is supplied to the bottom of the air lift pipe. By the air lifting through the pipe, the filtering media together with the sludge and pollutants are taken into the pipe and transported to the top area.
4) The filtering media with sludge and pollutant discharged by separating screen on the top are returned onto the packed bed, and the sludge and pollutant are discharged as washing wastewater.

3. Features

1) Simplified facilities
The back washing device requires only the air-compressor for the air-lift, and not the back-washing pump, blower, or tank that was needed for the fixed bed type reactor.
2) Simplified construction work
A steel reactor is manufactured at the factory to facilitate the field work, so that the construction term can be shortened.
3) Flexible response to the wastewater treatment projects
Cross section area per reactor has been standardized for up to 6 square meters, to flexibly meet with any capacity of projects.