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| The cultivation of completely autotrophic nitrogen removal over nitrite granular sludge and the recovery and enhancement of nitrogen removal |
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Abstract Complete autotrophic nitrogen removal over nitrite (CANON) process was successfully startedup with a low volumetric exchange ratio (30%) under alternative limited-oxygen/anaerobic mode in SBR, and the total nitrogen removal rate as well as the total nitrogen removal efficiency reached (312±15)mg/(L·d) and (71.2±4.3)%, respectively. The startup of CANON SBR experienced nitrification-leading phase, partitial-nitritation-leading phase and CANON phase in general. Granular biomass and floccular biomass were both found in SBR. The volume of granular biomass (radius3300μm) and floccular biomass (radius<300μm) made up 39% and 61% of total sludge volume, respectively. The long-term N2H4 addition recovered and enhanced their autotrophic nitrogen removal capacity, with the total nitrogen removal rate increased to (480±34)mg/(L·d). The proportion of granular biomass increased to 51% of total sludge volume.
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Received: 12 February 2014
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