溶解氧对单级颗粒污泥自养脱氮系统影响的模拟

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%.

Simulation study on the effect of dissolved oxygenon single-stage granular sludge autotrophic nitrogen removal system

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 0.6mg/L to 0.4mg/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%).