Rotating Biological Contactor

Rotating Biological Contactors use a series of slow-revolving discs which are hosts to a biological film that removes pollutants from wastewater. The discs sit within a trough, with approximately 40% of their diameter covered by the liquid. As the discs rotate, waste water is retained on the bacterial layer and subjected to oxidative conditions via air contact, breaking down both organic and inorganic materials, depending on the bacterial species present on the discs.

RBCs can use modular setups to achieve varying levels of removal and detention times. Carbon conversion typically takes place in the initial stages of the RBC whilst nitrification dominates in the latter stages. Sludge is regularly removed from the trough to prevent anaerobic conditions developing in the sludge, which causes sludge flotation due to denitrification processes producing nitrogen gas.

CRS can supply modular RBC units that are easy to install and operate, along with any ancillary equipment such as sludge pumps and chemical dosing systems.

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