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Kinetics of Haloacetic Acid Reactions with Fe(O)

机译：卤乙酸与Fe（O）反应的动力学

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Detailed kinetic studies of the reactions of haloacetic acids (HAAs) with Fe(O) were performed in longitudinally mixed batch reactors. The reactions of tribromoacetic acid (TBAA), bromodichloroacetic acid, and chlorodibromoacetic acid were mass transfer limited, with corrected mass transfer coefficients of 3.7-3.9 × 10{sup}(-4) m/s. The reactions of trichloroacetic acid (TCAA), dichloroacetic acid (DCAA), chloroacetic acid (CAA), and bromoacetic acid (BAA) were reaction limited. Bromochloroacetic acid (BCAA) and dibromoacetic acid (DBAA) were partially reaction limited. Forthe reaction limited species and partially reaction limited species, intra- and interspecies competition effects were observed. A Langmuir-Hinshelwood-Hougen-Watson kinetic model incorporating a mass transfer term was adopted to account for these effects. The lumped kinetic parameters for the HAAs ranged from 0.04 to 248 μM min{sup}(-1) for an iron loading of 0.3 g of Fe/125 mL and followed the trend DBAA > BCAA > TCAA > BAA > DCAA. The adsorption parameters ranged from 0.0007 to 0.0065 μM{sup}(-1). The effect of dissolved oxygen (DO) on the reaction of TBAA or BAA with Fe(0) was also investigated. No significant effect of DO on the reaction rate of TBAA, which is a mass transfer limited species, was observed. A lag phase, however, was observed for the reaction of BAA, which is a reaction limited species, until the DO was depleted. Simulations were performed to investigate the potential significance of the reactions of HAAs with Fe(O) in water distribution systems.
机译：在纵向混合间歇式反应器中进行了卤代乙酸（HAAs）与Fe（O）反应的详细动力学研究。三溴乙酸（TBAA），溴二氯乙酸和氯二溴乙酸的反应受到传质限制，校正后的传质系数为3.7-3.9×10 {sup}（-4）m / s。三氯乙酸（TCAA），二氯乙酸（DCAA），氯乙酸（CAA）和溴乙酸（BAA）的反应受到反应限制。溴氯乙酸（BCAA）和二溴乙酸（DBAA）部分受反应限制。对于反应受限物种和部分反应受限物种，观察到种内和种间竞争效应。考虑到这些影响，采用了结合了质量转移项的Langmuir-Hinshelwood-Hougen-Watson动力学模型。对于铁含量为0.3 g Fe / 125 mL的铁，HAA的集总动力学参数范围为0.04至248μMmin {sup}（-1），并遵循趋势DBAA> BCAA> TCAA> BAA> DCAA。吸附参数为0.0007至0.0065μM{sup}（-1）。还研究了溶解氧（DO）对TBAA或BAA与Fe（0）反应的影响。没有观察到DO对TBAA反应速率的显着影响，TBAA是传质受限的物种。然而，观察到反应受限的物种BAA的反应出现了滞后阶段，直到DO耗尽为止。进行模拟以研究HAA与Fe（O）在供水系统中反应的潜在意义。

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