表观气速对好氧污泥颗粒化过程中生化动力学模型参数变化的影响  

Effect of superficial gas velocity on the variation of biochemical kinetic model parameter of the aerobic sludge granulation processes

作　　者：范文雯 袁林江[2] 马远征 黄浩 FAN Wenwen;YUAN Linjiang;MA Yuanzheng;HUANG Hao(School of Energy and Architecture,Xi’an Aeronautical University,Xi’an 710077,China;Key Laboratory of Environmental Engineering,Shanxi Province,Key Laboratory of Northwest Water Resources Environment and Ecology,Ministry of Education,School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安航空学院能源与建筑学院,西安710077 [2]西安建筑科技大学环境与市政工程学院,陕西省环境重点实验室,西北水资源环境与生态重点实验室,西安710055

出　　处：《环境工程学报》2022年第6期1944-1956,共13页Chinese Journal of Environmental Engineering

基　　金：西安航空学院博士科研启动基金资助项目(206011944);国家自然科学基金资助项目(51278406)。

摘　　要：在高径比120/6,结构相同的2个SBR反应器中培养好氧颗粒污泥,并以修订ASM3模型为基础进行反应过程模拟,并分析表观气速(2.0 cm·s^(-1)和3.0 cm·s^(-1))对好氧污泥颗粒化过程中动力学参数的影响。结果表明,反应器运行初期(t=4 d),表观气速2.0 cm·s^(-1)时的半饱和系数K_(S)、基质降解动力学参数v_(max)、污泥衰减系数K_(d)、污泥比增殖速率μ_(H)和污泥的产率系数Y_(H)均大于表观气速3.0 cm·s^(-1)时的参数值,说明微生物在表观气速2.0 cm·s^(-1)时更易适应环境变化。然而,随着初始好氧颗粒的形成(t=10~28 d),各参数值在表观气速3.0 cm·s^(-1)时变得更高,尤其对K_(S)、μ_(H)及K_(d)的影响更明显。修订的ASM3可模拟好氧颗粒污泥形成过程中溶解氧DO、好氧速率OUR、COD、NH_(4)^(+)-N的变化,说明模型预测的可行性和有效性。反应器内表观气速不同,影响了微生物生长的各动力学参数和反应器内的流态,从而导致污泥的特性和结构发生了变化,最终使得SV_(30)/SV_(5)、污泥粒径、污泥密实度D_(2)和规则程度D_(pf),COD和NH_(4)^(+)-N等参数出现差异。本研究结果可为运用数学模型反映生物反应器中参数变化以优化反应过程提供参考。The aerobic granular sludge was cultivated in two bubble SBRs with same structure and a heightdiameter ratio of 120/6.The simulation was established based on the revised ASM3 model,and the effect of different superficial gas velocity(SGV)(2.0 cm·s^(-1)and 3.0 cm·s^(-1))on the biological kinetic parameter of the aerobic sludge granulation was analyzed.The results showed that,at the initial stage(t=4 d),the K_(S),v_(max),K_(d),μ_(H)and Y_(H)at the SGV of 2.0 cm·s^(-1) were higher than those at the SGV of 3.0 cm·s^(-1),indicating that microorganisms were more likely to adapt to the changes of the surrounding environment at the SGV of 2.0 cm·s^(-1).However,with the formation of initial aerobic granules(t=10~28 d),the values of parameters became higher at the SGV of 3.0 cm·s^(-1),especially for K_(S),μ_(H)and K_(d).The revised ASM3 can simulate the variation of dissolved oxygen DO,aerobic rate OUR,COD and NH_(4)^(+)-N during the formation of aerobic granular sludge,indicating the feasibility and effectiveness of the model prediction.The difference of SGVs influenced the dynamic parameters of microbial growth and the flow pattern,resulting in the changes of the characteristics and structure of the sludge,finally,the differences in parameters such as SV_(30)/SV_(5),sludge diameter,sludge density D_(2)and regular degree D_(pf),COD and NH_(4)^(+)-N were observed.The results of this study can provide reference for optimizing the reaction process by using mathematical model to reflect the variation of parameters in bioreactor.

关 键 词：好氧颗粒污泥 SBR 动力学参数 ASM3 

分 类 号：X703.5[环境科学与工程—环境工程]