好氧条件下生物转鼓同步脱硫脱硝性能及相应动力学模型的优化

为探究高效同步脱硫脱硝的生物工艺，以生物转鼓反应器为实验对象，研究了好氧条件下SO₂质量浓度、NO_x质量浓度、营养液体积和气体停留时间(EBRT)的变化对生物转鼓同步脱硫脱硝效果的影响，并用动力学模型拟合值与实验数据进行了对比。实验结果表明：生物转鼓同步脱硫脱硝最适条件为SO₂质量浓度1 200 mg·m⁻³，NO_x质量浓度800 mg·m⁻³，营养液体积20.6 L，气体停留时间(EBRT) 75.36 s；SO₂过程净化主要受液相传质控制，NO_x传质过程由生物相和液相协同完成；修正求得了能较好描述好氧条件下生物转鼓脱硫脱硝效果的动力学模型，因存在生物相、液膜、污染物流动等变量与假设的差异，SO₂和NO_x模拟数据与实验数据分别有2.68%和3.18%的平均绝对误差；在最佳条件下，SO₂和NO_x的平均去除率分别为96.81%和92.98%，平均去除负荷分别为55.50 mg·(L·h)⁻¹和35.53 mg·(L·h)⁻¹，且出气质量浓度均低于100 mg·m⁻³。可见，生物转鼓是一种可行的高效同步脱硫脱硝生物工艺。

Performance and kinetic model optimization of simultaneous desulfurization and denitrification for rotating drum biofilter under aerobic conditions

In order to explore a biological process that can efficiently and simultaneous desulfurization and denitrification, the rotating drum biofilter was taken as the experimental object, the effects of SO2 mass concentration, NOx mass concentration, nutrient solution volume and gas empty bed residence time in rotating drum biofilter on simultaneous desulfurization and denitrification under aerobic conditions were studied, and the fitted values of the kinetic model were compared with the experimental data. The results showed that the optimum conditions of simultaneous desulfurization and denitrification for rotating drum biofilter were SO2 mass concentration of 1 200 mg·m−3, NOx mass concentration of 800 mg·m−3, nutrient solution volume of 20.6 L and gas empty bed residence time of 75.36 s. The SO2 purification process was mainly controlled by liquid phase mass transfer, and the NOx mass transfer process was completed by the cooperation of biological phase and liquid phase. In addition, the kinetic model which can better describe the desulfurization and denitrification effect of rotating drum biofilter under aerobic condition was modified. Due to the differences of biological phase, liquid film, pollutant flow and other variables and assumptions, the average absolute errors of SO2 and NOx simulation data and experimental data were 2.68% and 3.18%, respectively. Under the optimum conditions, the average removal rates of SO2 and NOx were 96.81% and 92.98%, respectively, the average removal loads of SO2 was 55.50 mg·(L·h)−1 and NOx was 35.53 mg·(L·h)−1, respectively, and the outlet gas mass concentrations of SO2 and NOx were lower than 100 mg·m−3. It can be seen that the rotating drum biofilter is a feasible and efficient biological process for simultaneous desulfurization and denitrification.