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首页> 美国卫生研究院文献>Polymers >Removal of Boron and Manganese Ions from Wet-Flue Gas Desulfurization Wastewater by Hybrid Chitosan-Zirconium Sorbent
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Removal of Boron and Manganese Ions from Wet-Flue Gas Desulfurization Wastewater by Hybrid Chitosan-Zirconium Sorbent

机译：壳聚糖-锆混合吸附剂去除湿法烟气脱硫废水中的硼和锰离子

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Flue gas desulfurization (FGD) wastewater, after the alkaline precipitation and coagulation processes, often requires additional treatment in order to reduce the concentrations of boron and heavy metals below the required limits. In this study, we present an innovative and environmentally friendly method for boron and manganese removal that is based on a hybrid chitosan-zirconium hydrogel sorbent. The results from the batch adsorption experiment indicated that the uptake capacity for boron and manganese was equal to 1.61 mg/g and 0.75 mg/g, respectively, while the column study indicated that the total capacity of boron and manganese was equal to 1.89 mg/g and 0.102 mg/g, respectively. The very good applicability of the Langmuir isotherm at 25 °C suggested the monolayer coverage of the boron species onto the hybrid chitosan-zirconium hydrogel with a maximum adsorptive capacity of 2 mg/g. The amounts of boron and manganese in purified water could be decreased to less than 1 mg/dm and 0.05 mg/dm , respectively, starting from the initial concentration of boron equal to 24.7 mg/dm and manganese equal to 3.0 mg/dm in FGD wastewater. Selective desorption of boron from the loaded bed was favorable when a NaOH solution was used, while manganese was preferentially eluted with a HCl solution. It is important to note that such an innovative method was investigated for the first time by testing borax recovery from wastewater in terms of an eco-technological perspective.
机译：烟道气脱硫（FGD）废水在经过碱性沉淀和凝聚过程后，通常需要进行额外的处理，以将硼和重金属的浓度降低到要求的限值以下。在这项研究中，我们提出了一种基于脱乙酰壳多糖-锆水凝胶混合吸附剂的创新，环保的硼和锰去除方法。分批吸附实验的结果表明，硼和锰的吸收量分别等于1.61 mg / g和0.75 mg / g，而柱研究表明硼和锰的总吸收量等于1.89 mg / g g和0.102 mg / g。 Langmuir等温线在25°C时具有很好的适用性，表明硼类物质单层覆盖在壳聚糖-锆杂化水凝胶上，最大吸附能力为2 mg / g。从烟气脱硫中的硼初始浓度等于24.7 mg / dm和锰等于3.0 mg / dm开始，纯净水中的硼和锰含量可分别降至1 mg / dm和0.05 mg / dm以下。废水。当使用NaOH溶液时，从装载床中选择性地解吸硼是有利的，而锰优选地被HCl溶液洗脱。重要的是要注意到，这种创新方法是通过从生态技术的角度测试废水中的硼砂回收率而首次进行研究的。

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