Dehghanzadeh Reza, Roshani Babak, Asadi Mahzar, Fahiminia Mohammad, Aslhashemi Ahmad
Department of Environmental Health Engineering, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Chemical Engineering, University of Saskatchewan, Saskatoon, Canada.
Health Promot Perspect. 2012 Dec 28;2(2):236-43. doi: 10.5681/hpp.2012.029. eCollection 2012.
The objective of this research was to investigate the kinetic behavior of the biofil¬tration process for the removal of styrene.
A three stage compost based biofilter was inoculated with thickened activated sludge. The reaction order rate constants were obtained from continuous experiments and used as the specific growth rate for the Monod equation.
The measured concentration profiles show a linear dependence on the bed height in the biofilter at higher loadings, such as 75 and 45 g m-3 h-1. This is the condition of reaction limitation for a reaction with zero-order kinetics. From the experimental data, maximum elimination capac¬ity (ECmax) was estimated to be 44, 40 and 26 g m-3 h-1 at empty bed retention times (EBRTs) of 120, 60 and 30 s, respectively. However, at lower loadings, the measured concentration profile of the biofilter is one of exponential increase, which is the condition of both reaction and diffusion limitations for a reaction with zero-order kinetics. Maximum elimination capacities found from the experimental results were the same as Monod model predictions. Both the experimental re¬sults and the model predictions showed the influence of EBRT on the removal rate of styrene, particularly for the highest loading rate.
In terms of the practical applications of the proposed models have the advantage of being simpler than Monod kinetics and Monod kinetics requires a numerical solution.
本研究的目的是调查生物过滤过程中去除苯乙烯的动力学行为。
用浓缩活性污泥接种一个基于堆肥的三级生物滤池。通过连续实验获得反应级数速率常数，并将其用作莫诺方程的比生长速率。
在较高负荷下，如75和45 g m-3 h-1时，测量的浓度分布显示生物滤池中浓度与床层高度呈线性关系。这是零级动力学反应的反应限制条件。根据实验数据，在空床停留时间（EBRT）分别为120、60和30 s时，最大去除能力（ECmax）估计分别为44、40和26 g m-3 h-1。然而，在较低负荷下，生物滤池测量的浓度分布是指数增加的情况，这是零级动力学反应的反应和扩散限制条件。实验结果得到的最大去除能力与莫诺模型预测结果相同。实验结果和模型预测都表明了EBRT对苯乙烯去除率的影响，特别是对于最高负荷率。
就实际应用而言，所提出的模型比莫诺动力学更简单，莫诺动力学需要数值解。
