脉冲电絮凝法处理黄连素废水
Treatment of berberine hydrochloride wastewater by pulse electrocoagulation process
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摘要: 以Fe为电极，采用脉冲电絮凝法对实际黄连素制药废水进行研究。为了确定脉冲电絮凝法处理黄连素废水最优工艺条件，选择占空比、电流密度、脉冲频率、电极间距和pH等5个因素，开展了正交实验研究。对正交实验结果进行极差与方差分析，确定了各因素的显著性及优选条件。结果表明，各因素对废水COD去除率影响程度依次为：占空比> pH>电极间距> 脉冲频率> 电流密度；对黄连素去除率影响程度依次为：占空比> pH>电流密度> 脉冲频率>电极间距。最优工艺条件为电极间距为1.5 cm，电流密度为16.7 mA/cm2（电流3.5 A，电压11.2 V），占空比为0.4，脉冲频率为0.1 kHz，pH为10，此时废水的COD与黄连素的去除率分别为61%与74%。Abstract: Pulse electrocoagulation process was applied to the berberine hydrochloride wastewater treatment with Fe as electrode. In the process， pulse duty cycle， current density， pulse frequency， electrode distance and pH were selected as control factors. To investigate the relative sensitivities of control factors and the optimized conditions， orthogonal test was designed and variance analysis was carried out. The results showed that the influence degree on COD removal followed the sequence of pulse duty cycle> pH> electrode distance> pulse frequency> current density， and the degree on berberine removal followed the sequence of pulse duty cycle> pH> current density> pulse frequency> electrode distance. The optimal conditions were： pulse duty cycle of 0.4， pH of 10， electrode distance of 1.5 cm， pulse frequency of 0.1 kHz， current density of 16.7 mA/cm2 (current of 3.5 A， cell voltage of 11.2 V). Under the conditions， the removal efficiencies of COD and berberine reached 61% and 74%， respectively.
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