摘要
为了研究溶解氧对SBR单级颗粒污泥自养脱氮系统的影响,基于活性污泥ASM3模型和短程硝化-硝化-反硝化模型,将颗粒污泥传质过程与氨氧化菌(AOB)、厌氧氨氧化菌(AAOB)、亚硝酸盐氧化菌(NOB)、反硝化菌(DNF)的生长过程、好氧内源呼吸及缺氧内源呼吸过程等耦合,建立了单级自养脱氮颗粒污泥动力学模型,并对颗粒内部基质浓度分布进行预测.结果显示,当DO为0.4mg/L时,好氧区和缺氧区(厌氧区)的比例为0.4:1;当DO为0.6mg/L时,颗粒污泥好氧区与缺氧区(厌氧区)的比例为3:1.同时,根据基质反应速率方程,建立了颗粒污泥的单级自养脱氮系统动力学模型,对SBR系统运行效果进行预测,结果显示,DO为0.6mg/L时,氨氮反应完全,亚硝酸盐氮和硝酸盐氮在5mg/L以下,总氮去除率模拟值为89%左右,略低于实际测量脱氮率95%.
The effect of dissolved oxygen(DO)on single-stage granular sludge autotrophic denitrification in a sequencing batch reactor system was evaluated through coupling of mass transfer process of granule sludge,vegetation processes of ammonia oxidizing bacteria(AOB),aerobic ammonia-oxidizing bacteria(AAOB),nitrite-oxidizing bacteria(NOB)and denitrifying bacteria,and endogenous respiration processes of aerobic and anoxic bacteria.A kinetic model of autotrophic denitrification granular sludge was developed based on activated sludge model 3(ASM3)and the shortcut nitrification-nitrification-denitrification model,and subsequently the substrate concentration distribution within granular sludge was predicted.The results showed the ratio of aerobic zone to anoxic zone in granular sludge decreased from 3:1 to 0.4:1 when DO concentration decreased from 0.6 mg/L to 0.4 mg/L.Based on the matrix reaction rate equation,a system kinetic model of granular sludge single-stage autotrophic nitrogen removal was developed to predict system performance.The predicted result of total nitrogen removal rate(89%)was slightly lower than the actual measured removal rate(95%).
作者
李柏林
任晓玲
李晔
汪月
王伟
梁亚楠
LI Bo-lin;REN Xiao-ling;LI-Ye;WANG-Yue;WANG-Wei;LIANG Ya-nan(Hubei Key Laboratory of Mineral Resources Processing and Environment,School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2019年第12期5126-5133,共8页
China Environmental Science
基金
国家自然科学基金资助项目(51708431)
关键词
单级自养脱氮
颗粒污泥
DO
动力学模型
single-stage autotrophic nitrogen removal
granule sludge
DO
kinetic model
