石灰-粉煤灰联用处理高浓度含氟废水的研究

Study on the Treatment of High Concentration Containing Fluoride Wastewater by the Processing of Lime-fly Ash

针对石灰-粉煤灰联用处理高浓度含氟废水工艺的研究。研究结果表明,石灰一级处理L25(56)正交实验确定的最佳条件为温度为10℃、石灰投加量0.15 g、反应时间为30 min、PAM(浓度1%)加入量为0.1 mL、pH为7.0,该条件对200～1000 mg/L浓度范围的含氟废水具有较好的适用性;粉煤灰二级处理L27(313)正交实验确定的最佳条件为温度为35℃、粉煤灰加入量6.0 g、吸附时间为90 min、pH为5.5;采用石灰-粉煤灰联用处理1000 mg/L含氟废水,出水氟离子浓度可低至4 mg/L。工艺材料价廉易得、工艺简单、对含氟废水浓度适应性较宽。

The craft of dealing high concentration containing fluorine wastewater in the treatment of lime - fly ash was researched. The result showed that lime as an adsorbent in the first precipitation phase L25 （56） orthogonal experiment the optimal combination for the temperature 10℃, lime addition amount 0. 15 g, reaction time 30 min, PAM （mass fraction of 1% ） addition 0. 1 mL, pH 7.0, the removal of fluoride ions in wastewater is better applicability that can be achieved to for wastewater containing 200 - 1000 mg/L fluoride ions. Fly ash as the secondary precipitation phase L27 （3 ^13） , the optimal orthogonal experimental conditions were the temperature 35 ℃, fly ash addition amount 6.0 g, adsorption time 90 min, and pH 5.5. Lime -fly ash spectrometry technologyapplied in the treatment of 1000 mg/L fluoride wastewater, the effluent fluoride concentration was below 4 mg/L. The material in craft was cheap, and the craft was simple technology and concentration of waste water containing fluorine adaptability was wide.