毛细管微反应器降解亚甲基蓝废水试验研究

Experimental study on degradation of methylene blue wastewater by capillary microreactor

为提高Fe^(2+)活化过硫酸钠(SPS)降解亚甲基蓝(MB)效率,设计了一种毛细管微反应器。以磁力搅拌和静置反应系统作为对比,研究了在毛细管微反应器中MB与硫酸亚铁(FeSO_(4))混合液pH值、FeSO_(4)浓度、SPS浓度、进料流量以及毛细管长度对MB降解率的影响。结果表明:随着MB与FeSO_(4)混合液的pH值的增大,MB降解率先升高后降低;随着FeSO_(4)浓度的增加,MB降解率先升高后降低;当SPS浓度从0.2 mmol·L^(-1)增加到1.8 mmol·L^(-1)时,MB降解率显著升高,继续增加SPS浓度,MB降解率缓慢上升。随着进料流量和水浴温度的增加,MB降解率升高;随着毛细管长度的增加和进料流量的减小,MB降解率升高。在相同反应条件下,毛细管微反应器氧化降解性能优于磁力搅拌和静置反应系统。当MB浓度为0.2 mmol·L^(-1),MB与FeSO_(4)混合液pH值为3、FeSO_(4)浓度为1.4 mmol·L^(-1)、SPS浓度为1.8 mmol·L^(-1)、进料流量为1 mL·min^(-1)、毛细管长度为6.32 m时MB降解率可达85.92%。

In order to improve the efficiency of Fe^(2+)activated sodium persulfate(SPS)to degrade methylene blue(MB),a capillary microreactor was designed.Compared to magnetic stirring and static reaction system,the effect of pH of MB and FeSO_(4)mixture,FeSO_(4)concentration,SPS concentration,feed flow rate and capillary length on the degradation rate of MB in the capillary microreactor were studied.The results showed that with the increase of the pH of the mixture of MB and FeSO_(4),the degradation rate of MB first increased and then decreased;with the increase of FeSO_(4)concentration,the degradation rate of MB first increased and then decreased;when the SPS concentration increased from 0.2 mmol·L^(-1)to 1.8 mmol·L^(-1),the MB degradation rate increased significantly.If the SPS concentration continued to increase,the MB degradation rate increased slowly.With the increase of feed flow rate and water bath temperature,the degradation rate of MB increased.With the increase of capillary length and the decrease of feed flow rate,the degradation rate of MB increased.Under the same reaction conditions,the oxidative degradation performance of the capillary microreactor is better than the magnetic stirring and static reaction system.When the concentration of MB is 0.2 mmol·L^(-1),pH of the mixture of MB and FeSO_(4)is 3,FeSO_(4)concentration is 1.4 mmol·L^(-1),SPS concentration is 1.8 mmol·L^(-1),feed flow rate is 1 mL·min^(-1),and capillary length is 6.32 m,the MB degradation rate can reach 85.92%.