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Highly effective remediation of high-arsenic wastewater using red mud through formation of AlAsO4@silicate precipitate
Environmental Pollution ( IF 7.6 ) Pub Date : 2021-06-09 , DOI: 10.1016/j.envpol.2021.117484 Zhixu Lu 1 , Xianjin Qi 1 , Xing Zhu 1 , Xuezhu Li 1 , Kongzhai Li 1 , Hua Wang 1
Environmental Pollution ( IF 7.6 ) Pub Date : 2021-06-09 , DOI: 10.1016/j.envpol.2021.117484 Zhixu Lu 1 , Xianjin Qi 1 , Xing Zhu 1 , Xuezhu Li 1 , Kongzhai Li 1 , Hua Wang 1
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High-arsenic wastewater derived from the metallurgical industry of nonferrous minerals is one of the most dangerous arsenic (As) sources that usually follow the emission of massive hazardous arsenic-bearing wastes. Considering the properties of red mud (RM), we propose an alternative and environmentally friendly method for the efficient remediation of high-arsenic wastewater using RM through formation of AlAsO@silicate precipitate, aiming at ''zero-emission of hazardous solid waste''. The results show nearly 100% of arsenic could be stepwisely removed from high-arsenic wastewater and reduce the arsenic concentration from 6100 mg/L to 40 μg/L using RM at room temperature. The highest arsenic removal capacity of RM reaches 101.5 mg/g at a RM-to-wastewater ratio of 40 g/L due to the superior arsenic adsorption and the co-precipitation of arsenate and Al to form insoluble aluminum arsenate. The silicate shell of arsenic-loaded RM created at an alkaline condition acts as an arsenic stabilizer, resulting in a leached arsenic concentration of 1.2 mg/L in TCLP tests. RM acts as a highly effective arsenic remover and stabilizer for the disposal of high-arsenic wastewater. It shows great potential for the remediation of wastewater containing heavy metals with varying concentrations to produce clean water available for industrial purpose.
中文翻译：
通过形成AlAsO4@硅酸盐沉淀物，利用赤泥高效修复高砷废水
有色冶金工业产生的高砷废水是最危险的砷（As）来源之一，通常伴随着大量含砷危险废物的排放。考虑到赤泥（RM）的特性，我们提出了一种替代且环保的方法，通过形成AlAsO@硅酸盐沉淀物，利用RM有效修复高砷废水，旨在“危险固体废物的零排放” 。结果表明，室温下使用RM可以逐步去除高砷废水中近100%的砷，并将砷浓度从6100 mg/L降低至40 μg/L。由于优异的砷吸附能力以及砷酸盐和Al的共沉淀形成不溶性砷酸铝，当RM与废水的比例为40 g/L时，RM的最高除砷能力达到101.5 mg/g。在碱性条件下产生的载砷 RM 的硅酸盐壳充当砷稳定剂，导致 TCLP 测试中砷的浸出浓度为 1.2 mg/L。 RM作为高效除砷剂和稳定剂，用于处理高砷废水。它在修复含有不同浓度重金属的废水以生产可用于工业用途的清洁水方面显示出巨大的潜力。
更新日期：2021-06-09
中文翻译：
通过形成AlAsO4@硅酸盐沉淀物，利用赤泥高效修复高砷废水
有色冶金工业产生的高砷废水是最危险的砷（As）来源之一，通常伴随着大量含砷危险废物的排放。考虑到赤泥（RM）的特性，我们提出了一种替代且环保的方法，通过形成AlAsO@硅酸盐沉淀物，利用RM有效修复高砷废水，旨在“危险固体废物的零排放” 。结果表明，室温下使用RM可以逐步去除高砷废水中近100%的砷，并将砷浓度从6100 mg/L降低至40 μg/L。由于优异的砷吸附能力以及砷酸盐和Al的共沉淀形成不溶性砷酸铝，当RM与废水的比例为40 g/L时，RM的最高除砷能力达到101.5 mg/g。在碱性条件下产生的载砷 RM 的硅酸盐壳充当砷稳定剂，导致 TCLP 测试中砷的浸出浓度为 1.2 mg/L。 RM作为高效除砷剂和稳定剂，用于处理高砷废水。它在修复含有不同浓度重金属的废水以生产可用于工业用途的清洁水方面显示出巨大的潜力。
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