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响应面法优化电渗析处理褐藻酸钠废水工艺

Keywords: 废水,电渗析,响应面法,直流电耗

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Abstract:

采用电渗析器处理过滤的褐藻酸钠废水,褐藻酸钠废水初始水质如下:Ca2+(56mg/L)、Cl-(1808mg/L)、电导率(7.24mS/cm)。处理目标值如下:Ca2+(60mg/L)、Cl-(300mg/L)、电导率(2.50mS/cm)。运用Design-Expert分析软件,采用Box-Behnken的中心组合设计方法,研究了流量、电压及淡水浓水体积比及其交互作用对直流电耗的影响。建立了电渗析处理褐藻酸钠废水的二次多项数学模型,并以电渗析的直流电耗为响应值做响应面,确定电渗析处理褐藻酸钠废水的最佳工艺条件为:流量200L/h、电压40V、淡水浓水体积比1:1。在此条件下电渗析的直流电耗最小为0.45kWh/kg,电渗析器处理后的水质如下:Ca2+(56mg/L)、Cl-(259mg/L)、电导率(2.00mS/cm),达到处理目标。

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