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A new carrier for MBBR technology

By Gerald Ondrey |

Last month, Veolia Water Technologies (Birmingham, England; www.veoliawaterst.co.uk) introduced a new generation of biofilm carriers for moving-bed biofilm reactors (MBBRs). Trade-named AnoxKaldness Z-MBBR, the new carrier is the result of two decades of development work, says the company. Unlike conventional MBBR carriers, Z-MBBR has a unique, three-dimensional contoured structure (photo) that allows the creation of a self-controlled, pre-determined biofilm thickness on the carrier. This gives a controlled redox gradient and maximizes mass transfer, says the company. The Z carriers are customized to give biofilm thicknesses from 200 µm (for fully aerobic processes, such as nitrification) to 500 µm (for applications like the companys ammonox denitrification system [AntiMox], which require aerobic, anoxic and anerobic conditions). The first full-scale plant using Z-MBBR is currently under construction, and will be operational by the end of this year.
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