| 成核方式对诱导结晶工艺处理含铜废水的影响 |
| 摘要点击 1561 全文点击 1882 投稿时间：2010-12-04 修订日期：2011-02-28 |
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| 中文关键词 诱导结晶 重金属 含铜废水 均相成核 非均相成核 |
| 英文关键词 induced crystallization heavy metals copper-contained wastewater homogeneous nucleation heterogeneous nucleation |
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| 中文摘要 |
| 研究了诱导结晶过程中成核方式对诱导结晶工艺处理含铜废水的影响.在2组严格控制的实验条件下，分别考察均相成核和非均相成核下诱导结晶工艺运行效果，并利用扫描电镜（SEM）、X射线能谱分析（EDS）等手段考察了2种成核方式下回收的结晶产物的生长状态以及纯度.结果表明，当废水中铜的浓度为50 mg·L-1时，均相成核条件下，结晶反应器对铜的去除率为26.3%，而非均相成核条件下，去除率高达98.0%； 均相成核条件下形成的结晶颗粒产物结构松散、易破碎，且含有钙、镁等杂质； 而非均相成核条件下形成的结晶颗粒产物生长致密，纯度高，利于回收.可见，均相成核的发生不利于诱导结晶工艺的运行.根据实验结果进一步分析了均相成核和非均相成核2种方式下结晶颗粒物的生长过程，探讨了成核方式对诱导结晶工艺的影响机制。 |
| 英文摘要 |
| The effect of nucleation modes on the induced crystallization process for copper contained wastewater treatment was studied. Tests were undertaken to observe the difference of copper removal efficiency and the crystal growth with homogeneous and heterogeneous nucleation. When the influent copper concentration was 50 mg·L-1, copper removal efficiency could achieve 98.0% with the heterogeneous and 26.3% with homogeneous nucleation. And the SEM-EDS showed that the growth of crystals with heterogeneous nucleation was better and the purity of the crystals was higher than that with homogeneous nucleation. It is obvious that the homogeneous nucleation was an unfavorable condition on the induced crystallization process. Then the research devoted to discuss the process of induced crystallization with the two different nucleation mode and analysis the influencing mechanism of the homogeneous nucleation on the induced crystallization. |
