低浓度废水厌氧处理中不同动力学模型对比研究

Comparative study of different kinetic models in anaerobic treatment low-strength wastewater

采用厌氧颗粒污泥处理低浓度废水来启动实验规模的沼气提升厌氧反应器，以啤酒废水为例，厌氧反应器在温度（35±1）℃和进水COD浓度在2100-2400mg／L条件下，通过提高进水量方式，来缩短水力停留时间HRT和提高有机负荷OLR．用First—order、MonodandContois、GraBsecondorder和ModifiedStover-Kincannon动力学模型，考察在不同的HRT和进水浓度S条件下，出水浓度是与前两者的关系，确定动力学参数．实验结果表明：First—order和MonodandContois模型不适用本实验。Grausecond—order和ModifiedStover-Kincannon模型适用，通过后两个模型公式分别比较实验值足与计算值是的差别。

A laboratory-scale biogas-lift anaerobic reactor （BLR） with anaerobic granular sludge was fed with low-strength wastewater （brewery wastewater, in this study）. The operation temperature was at （35＋1）℃ and influent COD concentration was from 210o 2400mg/L. OLR was increased and HRT was decreased by gradually increasing the influent flow rate. First-order model, Monod and Contois model, Grau second-order model, and Modified Stover-Kincannon kinetic model were used to study variation of Se under different HRT and Si. Experimental results showed that First-order and Monod and Contois models were not applicable to this experiment, whereas both Grau second-order model and Modified Stover-Kincannon model generated acceptable results. Model evaluation was then carried out via assessing the linearity between the experimental data and the calculated values with the formulas of the latter two models. The deviation values showed that the calculation of Grau second-order model was closer to the experimental values than Modified Stover-Kincannon model.