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ATRAZINE REMOVAL BY PRELOADED GAC

机译:预装GAC去除ATRAZINE

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摘要

The effect of granular activated carbon (GAC) service time on the remaining life of GAC adsorbers that are exposed to periodic pollutant episodes was evaluated . Equilibrium and kinetic parameters describing the adsorption of atrazine were determined for GAC that had been preloaded with background organic matter (BOM) for as long as 25 months. Furthermore, atrazine removal was measured in pilot tests employing GAC that had been preloaded for five and 20 months. Isotherm data showed that (1)preloaded BOM sharply reduced the remaining adsorption capacity of GAC for atrazine,(2)competitive adsorption was not important on the tested preloaded GAC samples, and (3)use of pulverized preloaded GAC led to an overestimate of remaining adsorption capacity. Preloading had the greatest effect on GAC capacity; adsorption kinetics were not affected as severely. The homogeneous surface diffusion model was used to predict atrazine removal in pilot tests and to predict remaining GAC life. For the given adsorbent and background water, remaining life predictions for atrazine removal are presented for scenarios that may be typical for utilities in the midwestern United States and in western Europe.
机译:评估了颗粒活性炭(GAC)使用时间对暴露于周期性污染物发作的GAC吸附器剩余寿命的影响。确定了预先装载了背景有机物(BOM)长达25个月的GAC的平衡和动力学参数,描述了r去津的吸附。此外,在采用GAC的先导测试中对阿特拉津的去除情况进行了测试,该测试已预先加载了5个月和20个月。等温线数据表明(1)预加载的BOM大大降低了GAC对at去津的剩余吸附能力;(2)竞争性吸附在测试的预加载GAC样品上并不重要;(3)使用粉碎的预加载GAC导致对残留量的高估吸附能力。预装对GAC容量的影响最大。吸附动力学未受到严重影响。均质表面扩散模型用于预测试验试验中at去津的去除率和GAC剩余寿命。对于给定的吸附剂和背景水,提出了去除at去津的剩余寿命预测,适用于美国中西部和西欧的公用事业公司典型的情况。

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