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首页> 外文期刊>Journal of Environmental Engineering >Effects of particle stratification on fixed bed absorber performance
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Effects of particle stratification on fixed bed absorber performance

机译：颗粒分层对固定床吸收塔性能的影响

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摘要

The effects of adsorbent particle size distribution (PSD) and the layering of particles in stratified and reverse stratified modes on the performance of fixed bed adsorber were investigated. Using trichloroethylene as the adsorbate and granular activated carbon as the adsorbent, experimental studies were conducted in stratified beds for different flow rates and influent concentrations. The homogeneous solid diffusion model was modified to take into account PSD and was used to simulate breakthrough curves. The PSD-based model was validated using experimental data and was found to be more accurate in predicting the breakthrough curves than the non-PSD-based model. The validated model was used to conduct simulations to examine the effects of key variables on performance in the stratified and reverse stratified modes. In the reverse stratified mode, the adsorbent particle size decreases gradually in the direction of flow. Model simulations indicate that this mode of operation increases breakthrough time, decreases the time to reach saturation, and thereby increases the overall adsorbent capacity utilization. The mass transfer zone for the reverse stratified bed was found to be narrower and sharper than that for the stratified bed. These model predictions have important ramifications to the water and wastewater industry in terms of reducing the overall cost of treatment using granular activated carbon adsorption.
机译：研究了吸附剂粒度分布（PSD）和分层和反分层模式下的颗粒分层对固定床吸附器性能的影响。使用三氯乙烯作为吸附物，颗粒状活性炭作为吸附剂，在分层床中针对不同的流速和进水浓度进行了实验研究。修改了均质固体扩散模型以考虑PSD，并用于模拟穿透曲线。使用实验数据对基于PSD的模型进行了验证，发现与基于非PSD的模型相比，基于PSD的模型在预测穿透曲线方面更为准确。经过验证的模型用于进行仿真，以检验关键变量对分层和反向分层模式下的绩效的影响。在反向分层模式下，吸附剂的粒径沿流动方向逐渐减小。模型仿真表明，这种操作模式增加了突破时间，减少了达到饱和的时间，从而提高了整体吸附剂的利用率。发现反向分层床的传质区比分层床的传质区更窄和更锐利。这些模型预测在降低使用颗粒活性炭吸附的总处理成本方面对水和废水行业具有重要意义。

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