铁铝交流脉冲电凝聚处理含高浓度黄连素制药废水研究

Study on treatment of pharmaceutical wastewater containing high concentration berberine by AC pulse electrocoagulation

在传统电化学方法的基础上,提出了铁铝交流脉冲电凝聚法(ACPE)处理制药废水的方法。初步探索了铁铝ACPE处理黄连素制药废水的机理。在实验室条件下进行了可处理性和机理研究。对于黄连素废水(800mg·L^-1),脱色当电压为8V,反应时间为60min,交替周期为10s,电解质浓度为0.015mol·L^-1,搅拌速度为750r·min^-1,pH值为3~10,两板间距为0.6cm时,去除率最高,分别为98%和95%。对黄连素的去除,通过紫外-可见吸收光谱分析、酸化实验、乙二胺四乙酸(EDTA)屏蔽实验、构效关系、氧化和浮选实验,得出絮凝、浮选和氧化的去除效率分别为73%、8%和18%。200和400~1000mg·L^-1黄连素废水的脱色和COD去除分别符合表观拟一级和零级动力学。该方法对提高黄连素废水的处理效率和降低功耗具有指导意义。

On the basis of traditional electrochemical methods, the periodic reversal electrocoagulation of iron and aluminum(ACPE) was proposed to treat pharmaceutical wastewater. The mechanism of treating berberine pharmaceutical wastewater by Fe-Al ACPE was preliminarily explored. The treatability and mechanism were studied under laboratory conditions. For berberine wastewater(800 mg·L^-1), the highest removal rate was 98% and 95%when the voltage was 8V, the reaction time was 60 min, the alternating period was 10s, the electrolyte concentration was 0.015 mol·L^-1, the stirring speed was 750 r·min^-1, the pH value was 3 ~10 and the distance between the two plates was 0.6 cm. The removal efficiencies of berberine by flocculation, flotation and oxidation were 73%, 8% and 18% respectively through ultraviolet-visible absorption spectrum analysis, acidification experiment, EDTA shielding experiment, structure-activity relationship, oxidation and flotation experiments. Decolorization and COD removal of 200 and 400~1000 mg·L^-1 berberine wastewater accord with apparent pseudo-first-order and zero-order kinetics,respectively. This method had guiding significance for improving the treatment efficiency and reducing power consumption of berberine wastewater.