纳滤是去除饮用水中微量药物污染物的一种有效方法.本文选择中性药物安替比林(ANT)和异丙基安替比林(AMT)为研究对象,考察利用溶解-扩散模型和薄膜理论相结合的方法预测一种常用的纳滤膜NF-X对ANT和AMT的去除效果.模型建立过程中,首先在不同初始浓度和压力条件下进行实验,测得通量和去除率.试验结果表明,在温度一定的条件下,渗透通量与操作压力线性相关,而和初始浓度无关.根据已有的试验数据得到模型中的未知参数k和DK/δ,通过最优拟合的方法确定传质系数k与ANT和AMT初始浓度Co关系为k=αCβo,而DK/δ与C.无关,由此得到在不同操作压力和初始浓度条件下ANT和AMT去除率的预测模型(25℃,pH=7).最后,通过选取其它初始浓度和压力对模型进行验证,实验值和预测值相对误差小于10％,预测效果较好.
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