改性膨润土颗粒制备及对微污染水吸附性研究

Preparation of Several Bentonite Granules and Its Adsorption Properties of Micro-polluted Water

采用聚乙烯醇(PVA)为粘结剂和不同造孔剂(碳酸氢钠、卡拉胶、淀粉)对微波铝改性膨润土进行造粒,制备改性膨润土颗粒MBG1、MBG2、MBG3。考察了不同制备条件下MBG1、MBG2、MBG3对微污染水中UV254和NH4-N的降低效果。结果表明,MBG1对UV254和NH4-N降低效果优于MBG2和MBG3,MBG1的最佳制备条件为:PVA用量10 g/100m L水,碳酸氢钠用量5 g/100m L水,包埋量(m改性土∶mPVA)=10。在p H值为7、投加量3 g/L、吸附时间20 min的条件下,MBG1对20 mg/L腐殖酸、5 mg/L氨氮的微污染水降低率分别可达98%和20%以上。

Modified bentonite granules（MBG1, MBG2, MBG3） were prepared by mixing with polyvinyl alcohol（PVA） as binder and poreformer（sodium bicarbonate, carrageenan, starch） and microwave Al-bentonite. The effects of MBG1, MBG2 and MBG3 on UV254 and NH4-N in micropolluted water were investigated. The results showed that the removal efficiency of MBG1 on UV254 and NH4-N was better than MBG2 and MBG3. The best prepared conditions of MBG1 were PVA concentration 10%, sodium bicarbonate concentration 5% and embedding quantity（mmodified bentonite ： mPVA） of 10. Under the following conditions： p H value 7, MBG1 dosage of 3 g/L, adsorption time of 20 min, the removal rate of MBG1 on UV254 and NH4-N will be up to 98% and 20%, respectively at humic acid concentration of 20 mg/L and NH4-N concentration of 5 mg/L in micro-polluted water.