石油炼制与化工 ›› 2026, Vol. 57 ›› Issue (3): 123-128.

• 节能减排 • 上一篇    下一篇

化工废盐微污染物深度净化工艺技术研究

张超1,2,赵菲菲2   

  1. 1. 中化环境控股有限公司

    2. 中化环境科技工程有限公司

  • 收稿日期:2025-07-28 修回日期:2025-09-03 出版日期:2026-03-12 发布日期:2026-03-02
  • 通讯作者: 张超 E-mail:zhangchao_seu@163.com

RESEARCH ON DEEP PURIFICATION TECHNOLOGY FOR TRACE IMPURITIES IN CHEMICAL WASTE SALT

  • Received:2025-07-28 Revised:2025-09-03 Online:2026-03-12 Published:2026-03-02

摘要: 化工废盐中含有大量不溶性物质(SS)和微量Ca、Mg、Si、总有机碳(TOC)杂质,不利于废盐的资源化利用。针对废盐中的杂质,在不添加新的杂离子的条件下,研究了分步化学沉淀除杂和同步化学沉淀除杂对无机杂质的去除效果,以及活性炭吸附、树脂吸附、非均相臭氧氧化、均相臭氧氧化对TOC的去除效果。结果表明,同步除杂工艺对无机杂质的除杂效果更好,在pH为10.5、MgCl2/SiO2摩尔比为1.5、Na2CO3过剂量为300 mg/L的条件下,出水的SS,Ca,Mg,Si质量浓度分别可降至32,0,0.39,1.9 mg/L,SS对Ca,Mg,Si具有协同去除作用。与活性炭吸附、树脂吸附、非均相臭氧氧化工艺相比,均相臭氧氧化出水TOC质量浓度可降至5.2 mg/L。采用“同步化学沉淀+均相臭氧氧化”工艺,可实现化工废盐微污染物的深度净化。

关键词: 化工废盐, 同步除杂, 钙离子, 镁离子, 二氧化硅, 氯化镁, 均相臭氧氧化

Abstract: Chemical waste salt contains substantial insoluble substances (SS) and trace impurities such as calcium, magnesium, silicon, and TOC, which hinder its reutilization. In order to remove these impurities, this study investigated the removal efficiency of inorganic impurities through stepwise and synchronous removal methods, as well as the effectiveness of activated carbon adsorprion, resin adsorprion, heterogeneous ozone oxidation, and homogeneous ozone oxidation in TOC removal. Results demonstrate that synchronous impurity removal delivers superior inorganic impurity elimination. Under optimized conditions (pH 10.5, MgCl2/SiO2 molar ratio of 1.5, Na2CO3 excess dosage of 300 mg/L), effluent concentrations of SS, calcium, magnesium, and silicon can be reduced to 32, 0, 0.39, and 1.9 mg/L, respectively, with SS exhibiting synergistic removal effects on calcium, magnesium, and silicon. Compared to activated carbon adsorprion, resin adsorprion, and heterogeneous ozone oxidation processes, homogeneous ozone oxidation achieves a lower effluent TOC of 5.2 mg/L. The integrated "synchronous chemical precipitation + homogeneous ozone oxidation" process enables deep purification of micro-pollutants in chemical waste salt.

Key words: chemical waste salt, synchronous removal of impurities, calcium ion, magnesium ion, silicon dioxide, magnesium chloride, homogeneous ozone oxidation