化学沉淀法处理葫芦岛锌厂含镉废水的研究

采用化学沉淀法对葫芦岛锌厂含镉废水进行处理,分别考察了反应pH值、添加絮凝剂种类、反应时间、沉淀剂种类等因素对模拟含镉废水处理的影响,并在最佳条件下对葫芦岛锌厂含镉废水处理进行了研究。结果表明,采用化学沉淀法处理含镉废水时的合适pH值为11;当采用浓度为5%的FeSO4作为絮凝剂,浓度为10%的Ca(OH)2作为沉淀剂时,对含镉浓度为20mg/L的模拟含镉废水的最佳沉淀时间为15min;对含镉浓度为1200mg/L的实际废水处理后废水中镉离子浓度平均值为0.086mg/L,可以实现达标排放。

Chemical precipitation process was used to treat cadmium-contained wastewater of Huludao Zinc Plant.pH value,type of flocculation medicament,reaction time and type of precipitant were investigated.The cadmium-contained wastewater was treated under the optimal parameters,the results showed that the appropriate pH value was at 11,while FeSO4 of 5%was used as the flocculation medicament,Ca（OH）2 of 10%as the flocculant,for simulated cadmium-contained wastewater of 20mg/L,the optimal treat time was 15 min;the actual waste water of cadmium concentration of 1 200 mg/L was treated,the cadmium concentration of output water was 0.086 mg/L,the water quality could reach the discharging standard.