Comparative Study On Regeneration Of Activated Carbon With Reactive Brilliant Red

Dyeing wastewater has the characteristics of high chroma,high COD,poor biochemical properties,and uneven discharge.As a high-quality adsorption material,activated carbon is often used in the advanced treatment process of dyeing wastewater.Activated carbon will reach its saturation limit with prolonged time of use.Formerly,when reaching its saturation limit,activated carbon,as an expensive adsorbent,was usually taken to landfill and discarded without giving full play to its value.From an economical and environmentally friendly perspective,this article takes the regeneration of activated carbon as the main research direction and the research results are as follows:（1）Three single regeneration modes were studied:organic solvent elution,Fenton reagent oxidation and microwave irradiation regeneration.The optimum regeneration conditions and regeneration efficiency of Fenton reagent and microwave regeneration were found through the orthogonal test.The optimum condition of Fenton reagent regeneration was as follows:n（H₂O₂）:n(Fe²⁺),40:1;the dosage of hydrogen peroxide,2mL;pH,4;the reaction time,60 min.The result showed that regeneration rate could reach 78%.The optimum condition of microwave regeneration was as follows:irradiation power,700 W;irradiation time,2 min.The result showed that regeneration rate could reach 60%.（2）Fenton oxidation and microwave irradiation were combined to regenerate the exhausted activated carbon.The regeneration efficiency of Fenton reagent regeneration,microwave irradiation regeneration and Fenton-microwave regeneration were compared.Results are as follows:Fenton-microwave regeneration efficiency was significantly improved on the basis of Fenton regeneration;irradiation power,700 W;irradiation time,2 min.The result showed that regeneration rate could reach 95.16%.（3）The joint regeneration was used in microwave continuous reactor（continuous-flow tests）to research the possibility of the regeneration in furnace.In the meantime,the repeated regeneration and the effect of irradiation power and irradiation time were also studied.The possibility was studied through multiple regenerations under the same condition.Results are as follows:during continuous-flow tests,microwave irradiation time and irradiation power also greatly influenced the joint regeneration effect;irradiation power,2 000 W;irradiation time,50 seconds.The result showed that regeneration rate could reach 83.66%.The regeneration rate,declined slightly though,could still reach 60%after six times repeated regeneration.Adsorption breakthrough curve was fitted by Logistic model and the degree of fitting could reach more than 99%.（4）Under optimum conditions,the activated carbon containing reactive brilliant red and acid orange II were regenerated respectively through Fenton-microwave regeneration mode.The result showed that this mode had broad applicability and the regeneration rate could reach 90%.（5）The treatment effect of dyeing wastewater through microwave assisted with Fenton-microwave regenerated activated carbon was researched.The result showed that the removal rate was almost the same high as the original carbon.（6）The SEM,BET,Boehm and FTIR were used to explain the regeneration mechanism.