【摘要】 针对生物过滤在饮用水处理中的应用,建立了一种简单的数学模型.模型采用稳态形式,在Monod公式的基础上建立了反应过程速率表达式.模型忽略液相主体与生物膜内部的传质过程,主要描述了基质的生物降解过程,微生物附着到滤料上的过程以及从滤料表面脱落的过程.模型可以模拟出滤柱不同深度处的有机物和微生物浓度分布,模型中主要的动力学参数,即半饱和常数和最大比基质利用率由专门的实验测定出.用该模型分别对活性炭和无烟煤2种滤料滤柱进行了模拟,结果与实验测定值较为符合.更多还原

【Abstract】 Biofiltration was used in drinking water treatment process.A simple model was developed to simulate the performance of the process.A steady-sate model was applied and the mathematic expression of the reaction rate of the process was derived by Monod formula.The processes of substrate biodegradation,bacterial attachment onto filter media and detachment of suspended bacteria were described when the external and internal mass transfers were neglected.The organics and biomass profiles in a biofilter could be obtained from the model,and the key biokinetic parameters as half elocity constant and maximum specific substrate utiliation rate were estimated through a special experiment.Two kinds of biofilter,which took GAC and anthracite as media respectively were simulated by the model,and the results of the model testing show that the model prediction agrees well with the experimental data.Therefore,the model is an effective tool for design and operation.更多还原