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首页> 外文期刊>Journal of Chemistry >Chloride Ion Removal from the Wet Flue Gas Desulfurization and Denitrification Wastewater Using Friedel’s Salt Precipitation Method
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Chloride Ion Removal from the Wet Flue Gas Desulfurization and Denitrification Wastewater Using Friedel’s Salt Precipitation Method

机译：弗里德尔盐析法去除湿法烟气脱硫脱硝废水中的氯离子

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The desulfurization and denitrification wastewater (DDW) from the wet flue gas treatment project is difficult to be treated and recycled because of high chloride ion (Cl−) concentration. Cl− can cause equipment and piping corrosion. However, there is a lack of cost-effective treatment technologies for the removal of Cl− from the DDW. In this research, the feasibility of Cl− removal from the DDW using Friedel’s salt precipitation method was evaluated. Factors affecting the Cl− removal, such as Ca(OH)2 dosage, NaAlO2 dosage, solution’s initial pH, solution’s temperature, reaction time, stirring speed, and anions (SO42−, NO3−, and F−), were investigated, and the optimal experimental conditions for Cl− removal were determined. Experimental results showed that Friedel’s salt precipitation method can remove Cl− effectively and can achieve synergistic removal of SO42−, F−, and heavy metal ions. Under the best experimental conditions, the average removal efficiencies of Cl−, SO42−, F−, and heavy metal ions reach more than 85%, 98%, 94%, and 99%, respectively. The Cl− removal mechanism studies showed that Cl− can be removed by precipitation as Ca4Al2Cl2(OH)12. The purified wastewater and the precipitated solid can be reused to reduce the consumption of water and alkali. Friedel’s salt precipitation method is an effective control technology for the synergistic removal of Cl−, SO42−, F−, and heavy metal ions and has enormous potential to be applied in the industrial wastewater treatment field.
机译：来自湿法烟气处理项目的脱硫和反硝化废水（DDW）由于氯离子（Cl-）浓度高而难以处理和回收。 Cl−会导致设备和管道腐蚀。但是，缺乏从DDW中去除Cl-的经济有效的处理技术。在这项研究中，评估了使用Friedel的盐沉淀法从DDW中去除Cl-的可行性。研究了影响Cl-去除的因素，例如Ca（OH）2的用量，NaAlO2的用量，溶液的初始pH，溶液的温度，反应时间，搅拌速度和阴离子（SO42-，NO3-和F-），并确定了去除Cl-的最佳实验条件。实验结果表明，Friedel的盐沉淀法可以有效去除Cl-，并且可以协同去除SO42-，F-和重金属离子。在最佳实验条件下，Cl-，SO42-，F-和重金属离子的平均去除效率分别达到85％，98％，94％和99％。 Cl-去除机理的研究表明，Cl-可以通过沉淀以Ca4Al2Cl2（OH）12的形式去除。纯化后的废水和沉淀的固体可以重复使用，以减少水和碱的消耗。 Friedel的盐沉淀法是一种协同去除Cl-，SO42-，F-和重金属离子的有效控制技术，在工业废水处理领域具有巨大的潜力。

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