Due to the inconsistency between hydraulic retention time(HRT) and sludge retention time in the integrated reaction-precipitation reactor(IRRP), there is no definitive conclusion about the influence of HRT on the existing state and accumulation of nitrogen. Aiming at these problems, the effect of HRT on half-nitrosofication reaction in the IRRP was investigated. The results showed that nitrite could be accumulated without sludge washout during the operation of IRRP, and the concentration ratio of nitrite-N and ammonia-N in the effluent was affected by the HRT. At the HRT of 24 h, nitrite accumulation rate of the reactor could reach 70% with no ammonia-N in the effluent, which was difficult to meet the requirements of influent for subsequent ANAMMOX process. At the HRT of 16 h and 12 h, the concentration ratio of nitrite-N and ammonia-N in the effluent was 1.39:1 and 1.46:1, respectively with accumulation rate of nitrite exceeding 80%, which was suitable for ANAMMOX process. The effect of HRT on nitrification potential and nitrosation potential were 24 h>16 h>12 h and 12 h>16 h>24 h, respectively. Both ammonia oxidation rate and nitrite oxidation rate at different HRT were 24 h>16 h>12 h.
|ジャーナル||Chinese Journal of Environmental Engineering|
|出版ステータス||Published - 2014 1|
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