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Design and Operation of Moving Bed Biofilm Reactor Plants for Very Low Effluent Nitrogen and Phosphorus Concentrations

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Abstract:

Out of six plants with nitrogen removal in Norway, four plants use the Moving Bed Biofilm Reactor (MBBR) process. In all four cases the MBBR process offered a very compact treatment solution and had both the lowest investment costs and the lowest total annual costs. These MBBR plants use the combined denitrification process (pre-denitrification + post-denitrification) for nitrogen removal, followed by chemical precipitation for phosphorus removal. This type of design offers a lot of flexibility and enables the plants to produce very low effluent concentrations. External carbon sources used for post-denitrification are ethanol, methanol and monopropylene glycol. The plants have maximum design flows from 1,125 to 7,200 m3/h (7.1 to 45.6 mgd). Years of full-scale experience from these MBBR plants has documented that final effluent concentrations below 3 mg total N/L and 0.3 mg total P/L can be achieved at low wastewater temperatures and at acceptable capital and O & M costs.

Keywords: BIOFILM; CARBON SOURCE; CHEMICAL PRECIPITATION; DENITRIFICATION; FULL-SCALE; MBBR; NITRIFICATION

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193317707X256982

Publication date: November 1, 2007

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  • Water Practice™ publishes peer-reviewed articles and reports focusing on applied water studies. Topics include monitoring, facility operations and maintenance, management, policy, and other issues of interest and concern to water practitioners. The Journal publishes on a monthly to bi-monthly basis and is available online only.
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