ABSTRACT

Nitrous oxide (N₂O), as one of the six greenhouse gases, is mainly produced in the biological nitrogen removal process of wastewater treatment plants (WWTPs). Establishing the N₂O kinetic model can provide insight into the N₂O generation mechanism and regulate its production. This work uses Activated Sludge Model NO.3 (ASM3) as the basic framework, combines organic storage with endogenous respiration theory, and couples ammonia-oxidizing bacteria (AOB) denitrification pathway and the NH₂OH/NOH model to establish a kinetic model. Meanwhile, the Sequencing Batch Reactor (SBR) process with artificial simulated urban domestic sewage was used as the carrier; MATLAB and EXCEL software were used as tools to establish a model calculation programme. The simulated values obtained by substituting the operating conditions of the SBR process into the model and the measured values of the SBR process were analysed. The correlation coefficient (R²) between the experimental values and simulated values obtained for the 5 components of COD, ammonia, nitrite, nitrate and total N₂O is 0.952, 0.996, 0.902, 0.991 and 0.956, respectively, which indicates that the N₂O kinetic model has great consistency, this further shows that the established model modelling mechanism is clear and accurate, and provides a new method for the N₂O dynamic model.

摘要

一氧化二氮（N ₂ O）作为六种温室气体之一，主要在污水处理厂（WWTPs）的生物脱氮过程中产生。建立N ₂ O 动力学模型可以深入了解N ₂ O 的产生机制并调节其产生。本工作以活性污泥模型 NO.3 (ASM3) 为基本框架，将有机储存与内源呼吸理论相结合，将氨氧化细菌 (AOB) 反硝化途径与 NH ₂OH/NOH模型建立动力学模型。同时，以人工模拟城市生活污水的序批式反应器（SBR）工艺为载体；以MATLAB和EXCEL软件为工具，建立模型计算程序。将SBR工艺的运行条件代入模型得到的模拟值和SBR工艺的实测值进行了分析。_{COD、氨、亚硝酸盐、硝酸盐和总N 2} O 5个组分的实验值和模拟值的相关系数（R ² ）分别为0.952、0.996、0.902、0.991和0.956，说明N ₂O动力学模型具有很好的一致性，这进一步表明所建立的模型建模机制清晰准确，为N ₂ O动力学模型提供了新的方法。