Experimental Research On The Degradation Of Basic Fuchsin With DBD Plasma-Activated Carbon

Along with the rapid development of the dyeing and printing industry, printing and dyeing wastewater has become the main pollution sources of the water, the treatment of which is the emphasis and difficulty of the water pollution treatment. Research on printing and dyeing wastewater treatment technology is being highly concerned by the domestic and foreign experts.As the activated carbon with large specific surface area and chemical stability, active carbon absorption method has become the focus of research, but with in-depth study of this technology, the researchers found that:The method of Activated carbon adsorption only transfered the pollutants from one phase to another, in essence, did not completely remove the contaminants, and activated carbon regeneration is required, but now the regeneration methods have many disadvantages, thus limited the wide application of the technology. DBD (Dielectric Barrier Discharge) plasma technology is a new and advanced oxidation technology, although it showed great advantage in hard-degradation waste water processing, the need of complex equipment and high energy consumption become the bottleneck of its industrial application. In the view of these two kind of technical problems, this paper will combine the DBD plasma technology with activated carbon adsorption, used in the degradation of printing and dyeing wastewater, on one hand, the use of activated carbon adsorption can be extend the pollutants and active particles contact time and improve the degradation efficiency of DBD plasma; on the other hand, with the degradation of pollutants on the activated carbon, the activated carbon can be regenerated simultaneously. In this paper, the main results are as follows:(1) At the same experimental conditions (discharge voltage, power frequency, initial concentration, pH and circulating flow), The experiment investigated the activated carbon adsorption method,DBD plasma method and DBD plasma-activated carbon treatment three different treatment methods on the degradation of fuchsin basic.The results showed that:DBD plasma-activated carbon treatment can greatly improve the decolorization rate and COD removal of basic fuchsin simulated dyeing wastewater.(2) Examined reactor process parameters (such as discharge voltage, power frequency, etc), add the amount of activated carbon and recycle flow rate and other factors on DBD plasma-activated carbon degradation of basic fuchsin.The results showed that:in the power frequency f=8kHz and 10kHz conditions, can obtian a good decolorization rate; The degradation effect of Basic fuchsin solution under acidic and neutral conditions is superior to the alkaline conditions; Too large or too small recycle flow is not conducive to the degradation of basic fuchsin;The increase of the decolorization rate of Basic fuchsin basic is with the activated carbon dosage increase; Basic fuchsin solution initial concentration is higher, the decolorization rate is worse.(3) Through the degradation of pH value, CODcr value and spectrum variation of fuchsin basic,can be inferred the degradation mechanism of Basic fuchsin, under the action of O3,·OH and other active particles generated in the DBD plasma, the hydroxylated benzene ring structure of basic fuchsin occurs first, and further open-loop, and then the organic matter was oxidized with fat family Organic oxidation way, eventually mineralized into CO2 and H2O.(4) By varying the experimental conditions, investigate the change of DBD plasma regeneration of activated carbon adsorption isotherms and adsorption.The results showed that, DBD plasma regeneration of activated carbon on adsorption isotherms of Fuchsin Basic slightly below the new activated carbon, but for saturated activated carbon, adsorption capacity has greatly improved; As U-d=8KV-6mm, the adsorption rate of regenerated activated carbon is closest to the new activated carbon, As U-d=9KV-8mm, activated carbon regeneration effect is the worst; In the power frequency f=8kHz and 10kHz, the regenerated activated carbon adsorption rate is higher than the f=9kHz; the adsorption rate of regenerated activated carbon diminished with the added amount of carbon, indicated that the smaller use of activated carbon, the regeneration rate is better.