Abstract: The hydraulic characteristics of integrated cage denitrification bioreactor were investigated using pulse-stimulus response technique.The flow pattern of the bioreactor tended to be complete mixed flow with hydraulic retention time 4 h,superficial velocity 0.145 m·h^-1,hydraulic load rate 6.0 m³·m^-3·d^-1.When it was simulated with tanks-in-series(TIS)model,N number was 1.55,1.56,1.54 and 1.55 at air flow rate 1.714,3.214,6.429,8.571 m³·m^-3·h^-1 respectively.When it was simulated by axial dispersion(AD)model,the corresponding Peclet numbers were 1.479,1.503,1.466 and 1.478 at air flow rate 1.714,3.214,6.429,8.571 m³·m^-3·h^-1respectively.The prediction of TIS model and AD model matched with each other.The mean value of total dead space of the bioreactor was 41.63%,and the hydraulic dead space was 21.99%.However,air flow rate had little effect on the hydraulic behavior of the bioreactor in this investigation.

Key words: denitrification bioreactor, hydraulic characteristics, dead space, air flow rate

摘要： 水力特性是生物脱氮反应器高效稳定运行的基础,采用脉冲刺激响应技术研究了一体化笼式生物脱氮反应器的水力特性。试验结果表明:在水力停留时间为4 h,水力负荷为6.0 m³·m^-3·d^-1,表面流速0.145 m·h^-1的条件下,该反应器的流态趋于全混流。以多釜串联模型表征,供气量为1.714、3.214、6.429、8.571 m³·m^-3·h^-1时的串联釜数依次为1.55、1.56、1.54和1.55;以轴向扩散模型表征,对应的Peclet数分别为1.479、1.503、1.466和1.478;两个模型预测结果一致。反应器总死区的均值为41.63%,其中水力死区的均值为21.99%。在所试范围内,供气量对其水力特性的影响较小。

关键词: 生物脱氮反应器, 水力特性, 死区, 供气量