Intensifying effect of microwave plasma on iron-carbon internal electrolysis

In view of the facts that the degradation of organic matters in printing and dyeing wastewater is difficult,and the removal rate of organic matters by conventional internal electrolysis process is low,a new process that using microwave to intensify internal electrolysis for treatment of printing and dyeing wastewater was proposed,and the effects of the microwave power,the microwave action time,the reaction time,the pH value,the iron/carbon ratio,particle diameter of scrap iron,the reuse frequency of iron-carbon mixture and some other fators on the removal rate of organic matters were discussed.The results showed that:microwave not only can decompose dyestuff adsorbed by activated carbon,but also can regenerate the iron-carbon mixture.Internal electrolysis existed when scrap iron was mixed with activated carbon,and the regeneration of activated carbon by microwave was easier with the help of scrap iron.The iron-carbon mixture can be used 6 times after be irradiated by microwave.When the microwave power was 180 W,the microwave action time was 2 min,the reaction time was 40 min,the pH value was 3-5,the mass ratio of iron and carbon was 1 ∶ 1,the particle diameter of scrape iron was 0.9-2.0 mm,the simulated printing and dyeing wastewater collocated by disperse blue E-4R which the mass concentration of CODCr is 469.6 mg/L,the colority was 500 times was treated,after the treatment,the removal rate of CODCr was above 80%,and the decolorization rate was above 90%.