基于活性污泥模型与工艺的溶解氧灵敏度分析

Sensitivity analysis of dissolved oxygen based on activated sludge model and process

研究了市政污水处理厂活性污泥工艺中各因子对好氧池中溶解氧的影响。在活性污泥2D模型(ASM2D)基础上,模拟市政污水处理厂的活性污泥工艺,对温度、生物池工艺设计与运行参数、进水水质组分、ASM2D模型的动力学参数和化学计量系数进行全因子灵敏度分析。结果表明:温度、进水流量Q、污泥回流比R_(S)、好氧池水力停留时间HRT_(4)、氨氮质量浓度S_(NH)、慢速可降解基质质量浓度X_(S)和异养菌产率系数Y_(H)等为影响好氧池溶解氧的关键参数;对除温度外的6个参数进行多因素方差分析和极差分析,得到6个参数对溶解氧影响程度的排序:R_(S)>HRT_(4)>YH>Q>X_(S)>S_(NH),为后续的溶解氧生化机制模型研究提供基础参考。

The influence of various factors on the dissolved oxygen concentration in the aerobic tank of the activated sludge process in municipal sewage treatment plant has been studied.Based on the activated sludge model ASM2D,the activated sludge process of the municipal sewage treatment plant was simulated.The temperature,design and operation parameters of biological pond process,components of influent water and dynamic parameters and stoichiometric coefficients of ASM2D model were applied for full factor sensitivity analysis.The results showed that the key parameters affecting the dissolved oxygen in the aerobic tank were temperature,influent flow(Q),sludge return ratio(R_(S)),aerobic tank hydraulic retention time(HRT_(4)),mass concentration of ammonia nitrogen(S_(NH)),mass concentration of slowly degradable substrate(X_(S))and yield coefficient of aerobic bacteria(Y_(H)).Multivariate analysis of variance and range analysis of these key factors except the temperature were performed,demonstrating their influences on dissolved oxygen were in a sequence as follows:R_(S)>HRT 4>Y_(H)>Q>X_(S)>S_(NH),which can provide a basic reference for future research on biochemical mechanism model of the dissolved oxygen.