电絮凝处理造纸废水中无机离子迁移机制的研究

A study on migration mechanism of inorganic ions in papermaking wastewater by electrocoagulation

回用造纸废水中仍含有大量的无机离子,这不仅会使纸张质量下降,而且会加重造纸设备的腐蚀。本研究通过原子吸收分光光度法、硝酸银滴定法、铬酸钡分光光度法测定了电絮凝处理前后废水中无机离子的类型及含量;通过XRD检测絮凝物与阴极板吸附物中无机离子的类型,探讨了相关无机离子在电絮凝处理过程中的迁移机制。结果表明:处理后废水中的Fe^(2+)、Mn^(4+)、Cu^(2+)、Ca^(2+)、Mg^(2+)、SO^(2-)_4等离子的含量大大降低且水中不含Al^(3+),不会出现有些研究者所担心的Al^(3+)残留问题。

The massive inorganic ions in reuse papermaking wastewater can not only cause decline in paper quality but also exacerbate the corrosion of papermaking equipment. The types and contents of inorganic ions in wastewater before and after EC treatment were determined by atomic absorption spectrophotometry, silver nitrate titration method or barium chromate spectrophotometry. The types of inorganic ion in f locculation and attachment on the cathode plate were detected by XRD. The migration mechanism was discussed for the inorganic ions in electrocoagulation treatment process. The result showed that contents of Fe^（2＋）, Mn^（4＋）, Cu^（2＋）, Ca^（2＋）, Mg^（2＋）and SO^（2-）_4 were decreased largely and there was almost no Al^（3＋） iin wastewater after treatment. So the residue problem of Al^（3＋） which some researchers worried about will not happen.