| Electro-coagulation, known as one of the most promising water treatment technology, not only has been successfully applied for removing pollutants, but also can cause less secondary pollution. However, the plate passivation and large electric energy consumption limited the application of this technology. According to some related theoretical analysis, the application of periodic reversal power and paralleled multi-plates can effectively alleviate the passivation phenomenon, improve the removal efficiency, and reduce the energy consumption. Therefore, in this research, the paralleled multi-plates asynchronism periodically reversing electro-coagulation was adopted to treat simulated pharmaceutical wastewater.Based on the current efficiency, removal performance and energy consumption situation, the degradation mechanism and reaction conditions of paralleled multi-plates DC-electrocoagulation on treating Berberine simulated wastewater were studied. The optimum conditions of paralleled multi-plates synchronization/asynchronism periodically reversing electro-coagulation on treating Berberine and Amantadine Hydrochloride simulated wastewater were obtained through this research. The comparasion of different electrocoagulation methods were accomplished in the research.Three electrocoagulation methods were used to treat Berberine simulated wastewater in this research. With paralleled multi-plates DC-electrocoagulation method, Berberine and COD removal rate can reach 99.73%,92.21% respectively, unit electric energy consumption is 4.1813kW · h/(kgCOD). With paralleled multi-plates synchronization periodically reversing electro-coagulation method, Berberine and COD removal rate can reach 99.56%,92.75% respectively, unit energy consumption is 4.113 kW · h/(kgCOD). With paralleled multi-plates asynchronism periodically reversing electro-coagulation method, Berberine and COD removal rate can reach 99.76%,93.45% respectively, unit energy consumption is 3.694kW · h/(kgCOD). The treatment of Hydrochloride simulated wastewater with two different electro-coagulation methods shows diverse relust. With paralleled multi-plates synchronization periodically reversing electro-coagulation, the COD removal rate in Hydrochloride simulated wastewater can reach 87%, with paralleled multi-plates asynchronism periodically reversing electro-coagulation, the COD removal rate in Hydrochloride simulated wastewater can reach nearly 90%.The treatment of simulated pharmaceutical wastewater with paralleled multi-plates synchronization/asynchronism periodically reversing electro-coagulation shows that the number of plates has a great influence on COD removal efficiency. It was claimed that the plate number increased from 2 to 8, the COD removal rate can be improved from 20% to 90%.Studied on different electrocoagulation methods, the comparasion shows that the paralleled multi-plates DC-electrocoagulation has the lowest removal effect, the highest energy consumption, and the phenomena of plate passivation and concentration polarization. The removal effect of paralleled multi-plates synchronization periodically reversing electrocoagulation is slightly higer than that of paralleled multi-plates DC-electrocoagulation. The treatment of simulated pharmaceutical wastewater with paralleled multi-plates asynchronism periodically reversing electrocoagulation has the best degradation effect, the shortest processing time, and the lowest energy consumption. |
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