内循环颗粒污泥床硝化反应器流动模型研究

Flow Model of Internal-loop Granular Sludge Bed Nitrifying Reactor

采用脉冲刺激响应技术 ,对稳态内循环颗粒污泥床硝化反应器进行了示踪试验。根据试验结果 ,分别运用轴向扩散模型和多釜全混流反应器串联模型 ,对反应器沉淀区和循环区的流态进行了分析和判断。结果表明 ,反应器沉淀区的分散数D uL为 0 0 0 14 8,该区域的流态接近于平推流反应器 (PFR) ;反应器循环区的串联级数为1 0 2 1,该区域的流态接近于全混流反应器 (CSTR)。稳态时 ,反应器的理论水力停留时间为 36 0min ,实际水力停留时间为 341 2min ,反应器中死区所占的体积百分比为 5 2 2 % ,其中生物体死区为 0 75 % ,水力死区为 4 4 7% ,表明反应器结构性能良好。根据试验和分析结果 ,建立了内循环颗粒污泥床硝化反应器的流动模型 ,即全混流和平推流的串联组合模型。由流动模型所得的理论停留时间分布曲线与由试验所得的实际停留时间分布曲线吻合良好 ,两者的平均相对误差为 8 5 6 % ,表明所建模型具有较高的准确性。

Internal-loop granular sludge bed nitrifying reactor is a new type of aerobic nitrifying equipment and has shown a good potential for nitrification. To study the flow pattern and construct the flow model, the tracer tests were performed using pulse stimulus-response technique. Based on the experimental results, the flow pattern in the settling section and the circulating section of reactor were analyzed by axial dispersion model and tank-in-series model, respectively. The dispersion number D/uL of 0 00148 in the settling section indicates that its flow pattern is similar to plug flow reactor (PFR), and the series number N of 1 021 in the circulating section indicates that its flow pattern is similar to continuously stirred tank reactor (CSTR). During steady state, the theoretic hydraulic retention time is 360 min, and the actual hydraulic retention time is 341 2 min. The percentage of dead space in the reactor is 5 22%, thereinto the dead space caused by biomass (d b) is 0 75% and the hydraulic dead space (d h) is 4 47%, which shows that the structural performance of the reactor is excellent. Based on the experiments and analysis, a model of CSTR and PFR in series was constructed. The actual hydraulic retention time distribution of the reactor is in good agreement with the model predictions. Since the relative error between them is 8 56%, the model is accurate to describe the flow pattern. The results have laid a foundation for the kinetic model of the reactor and will be helpful for its design and operation.