摘要：

以氢氧化镁和水合铝盐作为沉淀剂，采用实验室配制的模拟工业废水，对废水中硫酸根的去除进行研究。考察溶液中氢氧化镁投加量、铝离子的投加量、反应时间、硫酸根的初始浓度、反应温度等因素对硫酸根去除率的影响，并且设置三因素三水平正交试验，在SO₄^2-初始质量浓度为2 000 mg/L，溶液体积为50 mL的情况下，得出最佳工艺条件为Mg（OH）₂投加量1.4 g，Al³⁺投加量0.284 g，反应时间40 min，去除率95.84%；工艺最高去除率可达97.68%。经XRD分析测得沉淀物为镁铝水滑石。

关键词: 氢氧化镁, 铝离子, 硫酸根, 工业废水

Abstract:

Using magnesium hydroxide and hydrated aluminum salt as precipitators, the simulated industrial waste-water prepared in laboratory has been applied to the research on the removal of SO₄^2- from industrial wastewater with high concentration.The effects of the factors, such as magnesium hydroxide dosage, aluminum salt dosage, reaction time, initial concentration of sulfate radical, reaction temperature, etc.on the removing rate of SO₄^2- are investigated.The three-factor and three-level orthogonal experiments are established.When SO₄^2- initial concentration is 2 000 mg/L, solution volume 50 mL, the optimum conditions obtained for the removal of SO₄^2- are as follow:magnesium hydroxide dosage is 1.4 g, aluminum ions dosage 0.284 g, and reaction time 40 min, the removing rate is 95.84%.Under optimum conditions the best removing rate can reach 97.68%.XRD detection results show that the main composition of the sediment is magnesium-aluminum hydrotalcite.

Key words: magnesium hydroxide, aluminum ions, sulfate radical, industrial wastewater

中图分类号: 

• X703.1