Hydrex Biorotor - Rotating Biological Contactor
The BIOROTOR is a biological treatment process for oxidizing organics pollutants in wastewater. It consists of a large diameter contact media attached to a central shaft rotating slowly in a wastewater basin. The media is only partially submerged. As the contactor rotate, the media is alternately submerged in the wastewater then exposed to air. This rotating action provides for the aeration of the wastewater while creating the necessary turbulence to mix the basin content to prevent the solids from settling out. The bacteria naturally present in the wastewater grow quickly as they adhere to the media surface. Within 2-3 weeks after initial start-up the entire surface will be covered with 2-4mm of active bacteria growth called biomass. The high concentration of bacteria in the biomass provides for a high degree of purification at a relatively short retention time.
Excess biomass continuously sloughs off from the media due to the shearing force exerted on the media passing through the wastewater. This prevents the clogging of the media, result in flocculation of suspended particles and provides for controlled and continuous growth of active biomass.
THE BIOROTOR media provides:
- a large surface area for the development of biological culture,
- intimate contact of the biological growth with the wastewater,
- efficient aeration of the wastewater,’
- positive means of continuously stripping excess biomass, and
- agitation of the missed liquor in the basin to keep sloughed solids in suspension