Pilot-Scale Testing of the Hybrid Membrane Biofilm Process (HMBP) for Total Nitrogen Removal from Municipal Wastewater
The hybrid membrane biofilm process (HMBP) is a novel technology for removing total nitrogen (TN) from municipal wastewater. Air-filled, hollow-fiber membranes are placed in an activated sludge basin, and the bulk liquid is left anoxic. Membranes support an aerobic, nitrifying biofilm, while produced nitrate is exported to the bulk liquid and reduced with BOD as the electron donor. Bench scale test on the HMBP have shown promising results, with high levels of nitrification and denitrification. This research reports on pilot scale testing of the HMBP. Nitrification rates at the pilot scale were lower than reported for bench scale studies, averaging 0.35 gN m-2 day-1. Despite the lower nitrification rates, effluent total inorganic nitrogen (TIN) concentrations below 6 mgN/L were achieved consistently with an average influent TIN concentration of 15 mgN/L. Over 75% of the produced nitrate and nitrite from nitrification was typically reduced with an average influent sCOD of only 68 mg/L and no exogenous donor addition.
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Document Type: Research Article
Publication date: 2008-01-01
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