生物膜填料塔同时脱硫(SO_2)脱氮(NO_x)动力学研究

Kinetics of simultaneous desulfurization (SO_2) and denitrification (NO_x) by biofilm-packing tower

研究运用3种动力学模型对生物膜填料塔同时脱硫脱氮的过程进行模拟研究,结果表明:生物膜内SO_2、NO_x的生化降解反应均为一级反应,且SO_2、NO_x在生物膜上的生化降解反应均为快速生化反应;依据吸附-生物膜理论及其动力学模型,对NO_x的出口质量浓度、生化去除量及净化效率进行模拟及对比验证表明,利用该理论建立的动力学模型模拟的理论值与实验值之间具有较好的相关性(相关系数在0.70~0.99);运用吸附传递生物降解机理及其动力学模型,对NO_x的出口质量浓度、生化去除量及净化效率进行模拟及对比验证表明,NO_x的出口质量浓度、生化去除量的理论值和实验值之间相关性较好,相关系数分别为0.99、0.89,而其净化效率的理论值与实验值之间的相关性不高(相关系数只有0.55).

In this study,three kinds of kinetic models were used to simulate the simultaneous desulfurization and denitrification process by biofilm-packing tower.The results indicated that the biochemical degradation reactions of SO_2 and NO_x in the biofilm were both the first-order reactions and fast-rate biochemical reactions. According to the Adsorption-Biofilm Theory and its kinetic model,the outlet mass concentration,biochemical removal and purification efficiency of NO_x were simulated and compared.The results indicated that there were good relativities between the theoretical and experimental values by applying this theory and its kinetic model（ the correlation coefficients were in the range of 0.70—0.99）.By applying the Adsorption-Transmittance and Biodegradation Mechanism and its kinetic model,the outlet mass concentration,biochemical removal and purification efficiency of NO_x were simulated and compared.The results indicated that there were good relativities between theoretical and experimental values of the NO_x mass concentration in outlet and biochemical removal by applying this theory and its kinetic model.The correlation coefficients of them were 0.99 and 0.89,but the relativity of purification efficiency between the theoretical and experimental values was not high（ the correlation coefficient was only 0.55）.