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首页> 外文期刊>Separation and Purification Technology >Analysis of breakthrough developments and modeling of fixed bed adsorption system for As(V) removal from water by modified calcined bauxite (MCB)
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Analysis of breakthrough developments and modeling of fixed bed adsorption system for As(V) removal from water by modified calcined bauxite (MCB)

机译：改性煅烧铝土矿去除水中As（V）的固定床吸附系统突破性进展分析与建模

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摘要

The feasibility of As(V) removal from aqueous environment by a fixed bed of the adsorbent,modified calcined bauxite (MCB),in a continuous flow system has been investigated.The response of the adsorbent bed under various operating conditions of bed depth,flow rate and influent concentration were examined.The various column parameters including adsorption rate,adsorption capacity and depth of exchange zone were evaluated using the Bohart and Adams adsorption model.MCB exhibited an adsorption capacity of 627.3 mg/l with an adsorption rate constant 0.99251/mgh at an influent As(V) concentration of 2 mg/1.A minimum adsorbent depth of 1.3 cm is enough to produce effluent with As(V) concentration less than 0.01 mg/1 from an influent of 2 mg/1,in a 20 mm diameter MCB column.The service time of adsorbent beds under different flow rate and influent concentration were predicted using the bed depth service time (BDST) model and are compared with experimental observations.The observed data on service time and breakthrough curve correlated well with the theoretical values.The breakthrough curves of MCB obtained by experimental observations under different flow rates were compared with those developed by mass transfer model using Langmuir isotherm data.In the continuous flow system,MCB is found to have As(V) scavenging potential of 0.470 mg of As(V)/g.
机译：研究了在连续流动系统中固定床吸附剂，改性煅烧铝土矿（MCB）从含水环境中去除砷（V）的可行性。在床深度，流量的各种操作条件下吸附床的响应使用Bohart和Adams吸附模型评估了各种柱参数，包括吸附速率，吸附容量和交换区深度.MCB的吸附容量为627.3 mg / l，吸附速率常数为0.99251 / mgh在进水的As（V）浓度为2 mg / 1的情况下。最小吸附深度为1.3 cm足以从20 mg的进水中2 mg / 1的废水中产生As（V）浓度小于0.01 mg / 1的废水使用床深服务时间（BDST）模型预测了不同流速和进水浓度下吸附床的服务时间，并与实验观察结果进行了比较。由于时间和穿透曲线与理论值吻合良好，在不同流速下，通过实验观察得到的MCB的穿透曲线与利用Langmuir等温数据通过传质模型建立的穿透曲线进行了比较。在连续流系统中，发现MCB具有0.470 mg的As（V）/ g的As（V）清除潜力。

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