摘要
基于活性污泥模型ASM2D,建立了亚硝化及硝化过程动力学模型,给出了动力学模型涉及到的过程速率、计量学系数和动力学参数,并构建了以pH和温度为可变参数的最大比生长速率表达式。用该模型对不同运行条件下的硝化过程进行了模拟,模拟结果显示:随着溶解氧的升高,历经NH_4^+-N氧化率和NO_2^+-N累积率随之升高的短程硝化过程,以及NO_2^--N进一步氧化为NO_3^--N的完全硝化过程;通过控制反应器的曝气时间在0.2d左右,污泥停留时间(SRT)在氨氧化细菌(AOB)和亚硝酸盐氧化细茵(NOB)最小停留时间之间,可实现亚硝酸盐的高效积累。同时还利用模型考察了短程硝化启动及稳定运行的特性,也进行了模拟值与实验实测值的比对,结果表明模型能够准确地模拟两步硝化过程从启动阶段到稳定短程硝化的变化趋势,模拟值与实测值的误差在合理范围之内。
A kinetic model for nitrosation and nitrification was established based on the activated sludge model of ASM2D, and the process rate equations, kinetic and stoichiometric parameters relating to it, as well as the expres- sion of the maximum growth rate affected by pH and temperature as variable parameters, were given. The nitrifica- tions under different conditions were simulated by using the model, and the simulation results showed that with the increase of dissolved oxygen, the rate of ammonia oxidation and the nitrite accumulation rate increased and a partial nitrification process came first, then the partial nitrification process turned into a complete nitrification process by the further oxidation of the generated nitrite into nitrate. The high accumulation of nitrite was realized by controlling the reactor conditions such as the sludge retention time （SRT） and the aeration time. Meanwhile, the start-up and the stable operation of the partial nitrification process were investigated by using the proposed model. The compari- son between simulation values and actual data showed that, the two step nitrification from the start-up period to the partial nitrification can be accurately simulated by the model, and there was a good agreement between simulation values and actual data.
出处
《高技术通讯》
CAS
CSCD
北大核心
2015年第8期859-864,共6页
Chinese High Technology Letters
基金
国家自然科学基金(51478134)资助项目
关键词
活性污泥模型
硝化
亚硝化
氨氧化
模拟
activated sludge model, nitrification, nitrosation, ammonia oxidation, simulation
