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Application of Powdered Activated Carbon to Floc Blanket Reactors for the Removal of Trace Organic Compounds 粉末活性炭在絮凝毯反应器中去除痕量有机物的应用
发布日期: 1999-01-01
本研究的目的是评估在天然有机物(NOM)存在下,将粉末活性炭(PAC)应用于絮体毯式反应器(FBR)去除农药阿特拉津时的稳态吸附过程。采用实验室规模的上流式FBR研究了不同PAC剂量对阿特拉津吸附的影响。还研究了碳剂量和水力加载速率对碳保留时间的影响。使用实验室进行了连续流动实验- 比例尺FBR。将溶解有机碳浓度为2.1 mg/L的进水加入阿特拉津,以保持2.0 ug/L的稳态浓度。对三种碳剂量(2、4和8 mg/L)的阿特拉津去除率进行评估。在不同的操作条件下,包括不同的水力加载速率、覆盖层深度和PAC剂量,评估了PAC在覆盖层中的累积以及由此产生的碳保留时间。在原水和凝结水中进行了吸附等温线和动力学测试,以评估共掺对阿特拉津吸附的影响。 模型预测结果与实验数据进行了比较,并讨论了该方法在连续流吸附系统中的适用性。
The objective of this study was to evaluate the steady-state adsorption process when powdered activated carbon (PAC) was applied to a floc blanket reactor (FBR) for the removal of the pesticide atrazine in the presence of natural organic matter (NOM). A laboratory-scale upflow FBR was used to investigate the operating conditions affecting adsorption of atrazine by various PAC doses. The effects of carbon dose and hydraulic loading rate on carbon retention times were also investigated. Continuous-flow experiments were conducted using a laboratory-scale FBR. The influent water, which contained a dissolved organic carbon concentration of 2.1 mg/L, was spiked with atrazine to maintain a steady-state concentration of 2.0 ug/L. Atrazine removals were evaluated for three carbon doses (2, 4 and 8 mg/L). PAC accumulation in the blanket and the resulting carbon retention times were evaluated for various operating conditions, including various hydraulic loading rates, blanket depths and PAC doses. Adsorption isotherms and kinetic tests were performed in raw and coagulated groundwater to evaluate the effect of coagualtion on atrazine adsorption. Model predictions were compared with experimental data and the applicability of this approach in continuous-flow adsorption systems was discussed.
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发布单位或类别: 美国-美国给水工程协会
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