中和铁氧体法净化低浓度Co^(2+)废水的工艺研究

Purification Process of Wastewater Containing Low Concentration of Co^(2+) by Neutralized Ferrite Method

采用正交试验研究了Cu2+、Zn2+、Mn2+单独作用或共存时中和铁氧体法净化低浓度Co2+废水的工艺。中和铁氧体法对Co2+、Cu2+、Zn2+、Mn2+4种离子去除效果较好,Cu2+、Zn2+、Mn2+单独作用或共存均不同程度降低了Co2+的去除效果。在各最优组合条件下,Co2+净化系数均高于1.00×104,残留质量浓度为0.40~0.50μg/L;Cu2+、Zn2+、Mn2+的残留质量浓度均低于5μg/L。Cu2+、Zn2+、Mn2+单独作用时各离子净化系数从大到小依次为Co2+>Mn2+>Cu2+>Zn2+,离子共存时各离子净化系数从大到小依次为Co2+>Cu2+>Mn2+>Zn2+,共存离子之间相互作用对铁氧体的形成具有影响。

The orthogonal experiments were carried out to study the purification process of wastewater containing low concentration of Co2＋ by neutralized ferrite method at the appearance of Cu2＋ , Zn2＋ , Mn2＋ or their mixture. The neutralized ferrite process can remove Co2＋ , Cu2＋ , Zn2＋ and Mn2＋ efficiently, while the removal efficiency of Co2＋ reduced by the appearance of Cu2＋ , Zn2＋ , Mn2＋ or their mixture. Under the optimized conditions, the decontamination factors （DF） of Co2＋ were all above 1.00 ）〈 104 , and the residual concentration was 0.40--0.50 /xg/L. Moreover, the residual concentrations of Cu2＋ , Zn2＋ and Mn2＋ were all lower than 5μg/L. With single ion, the DF sequence was Co2＋ Mn2＋, Cu2＋, Zn2＋. With coexistence of Cu2＋ , Zn2＋ and Mn2＋ , the sequence was Co2＋ ; Cu2＋; Mn2＋ ;Zn2＋. The interactions among ions had impact on the formation of ferrite.