Shut-cut nitrification characteristics of aerobic granule in a sequencing batch airlift reactor at low temperature

BAO Rui-ling¹, YU Shui-li^1,2, ZUO Xing-tao¹, Wang Juan¹

1.State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China;2.State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China



Abstract:

To investigate the shut-cut nitrification characteristics of aerobic granule,an aerobic granular sequencing batch airlift reactor(AG-SBAR) was carried out with mixed carbon sources of sodium acetate and glucose at 10¡À1 ¡æ.Results indicated that ammonia oxidizing bacteria was accumulated inside the aerobic granules and the reactor performed stably with shut-cut nitrification for a long term at low temperature.During the stable operation period,the effluent ammonia nitrogen concentration was maintained at 13.6 mg/L without nitrate and nitrite when the COD/N ratio was 20:1.However,the effluent concentration of ammonia nitrogen was below 0.5 mg/L with effluent nitrosation ratio of 96.7% on average when the COD/N ratio was reduced to 15:1 and 10:1.And the effluent phosphorus concentration was less than 0.4 mg/L during the stable period with the sludge retention time of 30 d.The phosphorus removal efficiency was not strongly influenced by the adjustment of COD/N ratio in this experiment.The removal efficiencies for COD,NH4+-N and PO43--P were 91.3%-94.6%,97.9%-99.7% and 97.1%-99.5%,respectively.

Key words:  aerobic granule  low temperature  nitrite accumulation

DOI£º10.11916/j.issn.1005-9113.2009.04.023

Clc Number:X703

Fund: