Department of Polymer Science and Technology, University of Calcutta, Kolkata, India.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2010 Nov;45(13):1750-7. doi: 10.1080/10934529.2010.513267.
In this paper we have presented a unique low cost arsenic removal technique using ferric hydroxide microcapsule-loaded alginate beads (FHMCA) as an adsorbent in a continuous packed column. The microencapsulated particles of ferric hydroxide were produced in a spray dryer and subsequently coated with calcium alginate to form spherical beads of about 2 mm diameter. Batch experiments were conducted with these beads to generate isotherm data. The loading capacity was found to be 3.8 mg arsenic/gm of adsorbent. The experimental data conformed to Freundlich adsorption isotherm. A generalized mathematical model was also developed and the visual basic codes run with the physical parameters of the adsorbent and isotherm data that were evaluated experimentally was achieved for a continuous 75 days' operation. The safe disposal of the spent adsorbent was confirmed by the toxicity characteristic leaching procedure (TCLP) results. With known set of physical parameters of the adsorbent, input water flow rate and its arsenic concentration, the model could predict the number of days the column would run with output below a specific arsenic concentration.
在本文中，我们提出了一种独特的低成本砷去除技术，使用负载氢氧化铁微胶囊的藻酸盐珠（FHMCA）作为吸附剂在连续填充柱中使用。氢氧化铁的微胶囊颗粒在喷雾干燥器中产生，然后用钙藻酸盐涂覆以形成直径约 2 毫米的球形珠。用这些珠进行了批量实验以生成等温线数据。发现负载容量为 3.8mg 砷/gm 吸附剂。实验数据符合弗伦德利希吸附等温线。还开发了一个通用的数学模型，并使用从实验评估的吸附剂的物理参数和等温线数据运行了可视化基础代码，连续运行了 75 天。通过毒性特征浸出程序（TCLP）结果证实了已使用的吸附剂的安全处置。使用已知的吸附剂物理参数、进水流量及其砷浓度，该模型可以预测柱运行的天数，输出低于特定的砷浓度。
