膨润土小球的制备及其对废水中镍(Ⅱ)的吸附作用研究

    The making of bentonite globule and its absorption ability for Ni(Ⅱ) from wastewater

    • 摘要: 将膨润土、海藻酸钠、PVA 和水,按一定的比例在加热的条件下,进行混合并制得小球,用于处理含镍废水。结果表明:Ni2+的初始浓度为 10mg/L 时,投加 5g(湿重)的膨润土小球,调节 pH 为 5,吸附时间为 25min,振荡速 度为 110r/min,振荡温度为 25℃的条件下,去除率可达到 97.6%。含镍废水处理后镍的浓度,可低于国家规定的排放标准 (GB8978-1996)。使用后的小球经过再生,在最佳处理条件下仍有较好的处理效果。

       

      Abstract: Under a certain condition of heating and mixing, bentonite, sodium alginate, polyvinyl alcohol and water can make into bentonite globule. The result show that, by using it to treat the nickel wastewater,when the initial concentration of Ni2+ is 10mg/L,under the following condition: pH≈5,dosage of globule 5.0g(wet weight), temperature 25℃, vibration velocity 110r/min,elapsed time of vibration 25mins,the removal rate of Ni2+ by treatment of bentonite globule can reach greater than 97.6% After processing, the concentration of the remaining nickel in wastewater is lower than the national maximum allowable emission standard. After the process of reproducing,bentonite globule can still have a good removal rate under the best treatment condition.

       

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