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| The HSBNR process, which contained attached and suspended cells, could treat a high-strength ammonium wastewater and stably achieved long-term SBNR (over 1.5 years in HSBNR II). The lack of NO3 in the HSBNR reactors was achieved by maintaining a moderately high FA concentra-tion (20 < FA < 25 mg/L) and a low DO (<1 mg/L), which worked together to eliminate nitrate accumulation. The overall DCOD/DNOx-N ratio was 2.5¨C3.2, a value clearly dominated by shortcut denitrification in the anoxic tank, where 66¨C76% of the COD removal occurred. The biofilm carriers in the aerobic tank selectively enriched for ammonium oxidizers in the aerobic tank selecting against nitrite oxidizers. In particular, the selective accumulation of ammonium oxidizers in the porous biofilm carrier increased their SRT by over 50% from the total-biomass SRT. In addition, the low DO in the aerobic tank enhanced direct denitrification of NO2, which selected against nitrite oxidizers and enhanced shortcut denitrification. |
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