高氟高氯酸性废水净化工艺实验研究
发布时间：2018-07-23 14:38
【摘要】：本文在污酸蒸发浓缩基础之上,对蒸发浓缩过程中收集的酸性含氟、氯离子冷凝液的净化工艺进行了实验研究。通过对国内外含氟、氯废水处理工艺的分析比较,研究了采用氢氧化钙+偏铝酸钠二级沉淀和离子交换树脂吸附深度处理高氟高氯酸性废水的组合工艺。主要研究内容和结论如下:实验首先研究了氢氧化钙+偏铝酸钠处理高氟高氯酸性废水过程中各个因素对氟、氯离子去除效果的影响。结果表明:一级沉淀过程中,按钙∶氟摩尔比为1∶2,钙:铝:氯摩尔比为2∶1∶1投加氢氧化钙和偏铝酸钠,控制反应温度25℃,p H在12.5左右,搅拌转速400 r/min,反应时间80 min,PAM投加量为20 mg/L。在该条件时,废水中氟离子浓度从6300 mg/L下降至19.3 mg/L,氯离子浓度从1200 mg/L下降至597 mg/L。二级沉淀过程的最佳条件为:按钙∶铝∶氯摩尔比为6∶3∶1投加氢氧化钙和偏铝酸钠,反应温度在25℃,搅拌速度为300 r/min,p H在12.5左右反应60 min,PAM投加量为20 mg/L。经二级沉淀处理后,上清液中氯离子下降到191 mg/L,氟离子下降到5 mg/L。然后实验考察了201×7阴离子交换树脂对二级沉淀后的低浓度氟、氯废水的处理效果及离子交换过程的作用机理。确定了静态实验的最佳条件为树脂投加量为2.5 g,p H在11以下,控制温度25℃,树脂吸附反应30 min即可达到平衡,在此条件下可使氟、氯离子去除率分别达到72%和90.3%。影响树脂离子交换吸附氟、氯离子的因素的先后顺序为:树脂投加量㧐反应时间㧐反应温度。201×7树脂去除氟、氯离子的作用机理以离子交换为主;201×7树脂对氟、氯离子的吸附过程较符合Langmuir等温吸附模型。动力学研究表明,201×7树脂对氟、氯离子的吸附反应可以用二级动力学模型解释,离子交换吸附过程主要是吸附反应阶段控制。动态吸附实验时进水流速控制在28 m L/min较为合适,高径比控制在6.25左右为宜。动态解析实验以浓度为1mol/L的Na OH溶液为解吸剂,流速在5 m L/min时再生效果最佳。
[Abstract]:Based on the evaporation and concentration of waste acid, the purification process of acidic fluorine and chloride condensate collected in the process of evaporation and concentration was studied experimentally in this paper. Based on the analysis and comparison of the treatment process of wastewater containing fluorine and chlorine at home and abroad, the combined process of advanced treatment of perchloric acid wastewater with calcium hydroxide and sodium metaluminate and ion exchange resin adsorption was studied. The main contents and conclusions are as follows: firstly, the effects of various factors on the removal of fluoride and chlorine ions in the treatment of perchloric acid wastewater with calcium hydroxide were studied. The results showed that calcium hydroxide and sodium aluminate were added at 2:1:1 according to the molar ratio of calcium to fluorine at 1: 2, and the reaction temperature was about 12.5 at 25 鈩，
本文编号：2139719
[Abstract]:Based on the evaporation and concentration of waste acid, the purification process of acidic fluorine and chloride condensate collected in the process of evaporation and concentration was studied experimentally in this paper. Based on the analysis and comparison of the treatment process of wastewater containing fluorine and chlorine at home and abroad, the combined process of advanced treatment of perchloric acid wastewater with calcium hydroxide and sodium metaluminate and ion exchange resin adsorption was studied. The main contents and conclusions are as follows: firstly, the effects of various factors on the removal of fluoride and chlorine ions in the treatment of perchloric acid wastewater with calcium hydroxide were studied. The results showed that calcium hydroxide and sodium aluminate were added at 2:1:1 according to the molar ratio of calcium to fluorine at 1: 2, and the reaction temperature was about 12.5 at 25 鈩，
本文编号：2139719
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