Treatment of wastewater by nanofiltration-ion exchange technology in uranium conversion process

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2024-09-13 DOI:10.1007/s10967-024-09762-6

Long Geng, Beijia Chang, Tianfu Li, Zeyu Ji, Binliang Li, Yongqiang Wan, Keliang Shi, Junqiang Yang

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Abstract

The uranium in the radioactive wastewater produced by uranium conversion process is higher than the emission limit value, so it is of great significance to treat it to reduce its concentration. Nanofiltration technology and ion exchange technology were combined to treat uranium-containing wastewater and it can achieve the discharge standard. For the treatment system, uranium was firstly enriched in nanofiltration concentrate, and the concentrate entered the ion exchange system for selective adsorption of uranium. Because uranium exists in the form of complex cations or anions at different pH conditions, the use of cation–anion exchange resin tandem treatment technology can effectively and selectively adsorb almost all uranium. Both laboratory and engineering application results showed that the uranium concentration in the nanofiltration solution can be reduced to less than 50 μg/L after treating by the nanofiltration system for the wastewater containing 5–100 mg/L uranium. This work demonstrated that nanofiltration-ion exchange technology is practical and valuable for the treatment of acidic or alkaline uranium-containing waste liquid.

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在铀转化工艺中采用纳滤-离子交换技术处理废水

铀转化过程中产生的放射性废水中铀的含量高于排放限值，因此对其进行处理以降低其浓度具有重要意义。纳米过滤技术与离子交换技术相结合，对含铀废水进行处理，可以达到排放标准。在处理系统中，首先在纳滤浓缩液中富集铀，浓缩液进入离子交换系统对铀进行选择性吸附。由于铀在不同的 pH 值条件下以复杂的阳离子或阴离子形式存在，采用阳离子-阴离子交换树脂串联处理技术可以有效地选择性吸附几乎所有的铀。实验室和工程应用结果表明，对于含铀 5-100 mg/L 的废水，经纳滤系统处理后，纳滤液中的铀浓度可降至 50 μg/L 以下。这项工作表明，纳滤-离子交换技术在处理酸性或碱性含铀废液方面具有实用价值。图文摘要

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.