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  

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

作　　者：沙昊雷[1] 沈家辰 黄梦霞 蔡鲁祥 毛芝娟[1] SHA Haolei;SHEN Jiachen;HUANG Mengxia;CAI Luxiang;MAO Zhijuan(College of of Biological&Environmental Sciences,Zhejiang Wanli University,Ningbo 315100,China;College of Arts and Design,Ningbo University of Finance&Economics,Ningbo 315175,China)

机构地区：[1]浙江万里学院生物与环境学院,宁波315100 [2]宁波财经学院艺术设计学院,宁波315175

出　　处：《环境工程学报》2022年第1期190-199,共10页Chinese Journal of Environmental Engineering

基　　金：宁波市公益类科技计划项目(2019C50002,2021S143);浙江省“生物工程”一流学科开放基金资助项目(KF2020001);浙江省一流学科“生物工程”学生创新项目(CX2020021)。

摘　　要：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SO_(2)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SO_(2)质量浓度1200 mg·m^(−3),NOx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;SO_(2)过程净化主要受液相传质控制,NOx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,SO_(2)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,SO_(2)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。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 SO_(2) mass concentration,NO_(x) 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 SO_(2) mass concentration of 1200 mg·m^(−3),NO_(x) 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 SO_(2) purification process was mainly controlled by liquid phase mass transfer,and the NO_(x) 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 SO_(2) and NO_(x) simulation data and experimental data were 2.68%and 3.18%,respectively.Under the optimum conditions,the average removal rates of SO_(2) and NO_(x) were 96.81%and 92.98%,respectively,the average removal loads of SO_(2) was 55.50 mg·(L·h)^(−1) and NO_(x) was 35.53 mg·(L·h)^(−1,)respectively,and the outlet gas mass concentrations of SO_(2) and NO_(x) 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.

关 键 词：生物转鼓 SO_(2) NO_(x) 脱硫脱硝 动力学模型 

分 类 号：X701[环境科学与工程—环境工程]