Microwave regeneration wastewater treatment
    Activated carbon as a readily available and effective adsorbent , is widely used in the field of wastewater treatment . In addition to the regeneration of activated carbon alone outside , and sometimes also other substances added activated charcoal , these substances in the microwave field changes, the regeneration of activated carbon have multiple effects , which is called the microwave regeneration technology . The present study shows that the first contaminants adsorbed onto activated carbon or other adsorbent , and then placed in the microwave field radiation , compared with radiation placed directly in the microwave field has better treatment effect.
    Of organic pollutants in sewage treatment method is commonly used activated carbon adsorption, but the adsorption activated carbon surface organics are difficult to deal with . While the microwave regeneration technology can effectively desorbed organic carbon surface , making activated carbon regeneration and facilitate digestion of organic matter and recycling. Chih other low energy level microwave radiation on sewage adsorbed on the surface of granular activated carbon organic compounds trichlorethylene, xylene, naphthalene , and hydrocarbons desorbed and digestion , with the ultimate decomposition rate of 100% , the treated quality and stability. Moreover , desorption can be recycled organic microwave heating . Developed a Ha2mer such as fixed-bed desorption microwave heating apparatus of the device with the polymer from the activated carbon and zeolite desorption recovery of ethanol and an organic resin. Tai such as the use of activated carbon and the use of microwave radiation absorbed phenol degradation of phenol on activated carbon absorption , the findings showed that adopting this approach the mass concentration of 5. 0 mg / L and 50. 0 mg / L of phenol solution after degradation undetectable the presence of phenol , all the degradation of final products H2O and CO2. Experiments also show that dual reaction system ( activated carbon adsorption and microwave heating two separate systems ) the degradation efficiency of the reaction system than a single , high efficiency, in particular, a relatively high concentration of phenol when the mass (50. 0 mg / L).
     Tai microwave treatment solution such as the benzene , toluene , xylene and phenol, 90 s after the microwave radiation , benzene , toluene , xylene was completely degraded into H2O and CO2, 240 s after the phenol was completely degraded into H2O and CO2. It was also found that , under microwave irradiation , the activated carbon particles arcing and soon became red , then the temperature up to 1 200 ℃ or more, at such high temperatures quickly decompose organic pollutants into H2O and CO2. Zouzong Bo and other conditions in the presence of activated carbon by microwave radiation sulfosalicylic acid removal from wastewater pollutants in wastewater sulfosalicylic acid removal rate can reach 97.4% . Old Chang Hung et al [20 ] studied the ACF ( ACF ) and activated carbon in the presence of microwave radiation to remove indole coking wastewater pollutants . Under microwave irradiation , treatment with ACF indole solution has a significant effect , 3. 5 min removal rate can reach 98% . Microwave radiation can not make indole degradation , its role is to change the pore structure of the ACF , the adsorption capacity increases . Zhang Guoyu such as the use of microwave radiation in removing dioctyl phthalate vinegar contaminants. Using 12 ~ 16 mesh JX - 106 coconut shell activated carbon 5 g and 50 mL water ( solid-liquid ratio 1:10 ) were mixed in microwave power 500 W, radiation treatment 5 min, the COD mass concentration of 648 mg / L to 70. 1 mg / L, COD removal rate was 89.2% , the pH value of wastewater almost no effect on the treatment effect . Further study found that the microwave radiation field of organic pollutants in wastewater by adsorption on activated carbon surface - oxidation of synergy being rapidly degraded . Feng Jianmin techniques such as the use of microwave radiation acid yellow dye wastewater treatment . Concentration of 50 mg / L of acid yellow dye wastewater 50 mL, carbon dosage 2 g, microwave power 800W, handling 7 min, can get the best wastewater treatment . Wang Jincheng , etc. in the presence of activated carbon by microwave irradiation enables Reactive Brilliant Blue KN - R solution rapidly bleaching, per gram of activated carbon concentration of 300 mg / L of Reactive Brilliant Blue KN - R solution, 50 mL, microwave radiation 4 min, decolorization rate was 97.1% . The study also shows that due to activated carbon under microwave irradiation Reactive Brilliant Blue KN - R by activated carbon treatment was significantly higher than normal temperature of Reactive Brilliant Blue KN - R by adsorption capacity , indicating the presence of activated carbon , microwave irradiation enables reactive brilliant Blue KN - R bleaching. However, there are some wastewater treatment activated carbon effect is unsatisfactory , the treatment process needs to be further studied. Yang Liangyu and other presents a microwave regeneration of activated carbon and iron using a mixture of new dye wastewater treatment method used in a mixture of carbon than iron alone dye wastewater removal efficiency of activated carbon has significantly improved ; joined the iron and promote microwave regeneration , activated carbon, while the dye adsorption on activated carbon obtained degradation ; microwave charcoal iron after many wastewater treatment can maintain more than 99% color removal , COD removal efficiency of 64% or more. Studies in the future can be considered in the activated carbon added to iron or other metals to improve the treatment effect.
    For other absorbent material ( eg organic bentonite ) stakeholders also do the research at home and abroad have been reported , such as Sang - Mo Koh, Joe BorisDixon such as the use of organic bentonite benzene and phenol wastewater , Konduru R. Ramakrishna, T. Viraraghavan etc. Dyeing Wastewater there are also a lot of literature reported the use of organic bentonite treatment of organic wastewater decolorization and phenol, aniline and other organic pollutants approach. Such as Liji Wu Collaborative organic bentonite by microwave treatment of organic wastewater, wastewater treatment nitrophenol , organic bentonite through 100 mesh sieve , and waste solid-liquid mass ratio of 1:3 000 , microwave power 700 W, irradiation 30 s ~ 3 min, It was determined that the removal rate of p-nitrophenol in 85%. On acid red dye wastewater treatment, wastewater to be treated with organic bentonite mass ratio of 1:2 000 , microwave power 700W, irradiation time after 2 min , cooled to room temperature to achieve solid-liquid separation by centrifugation , the determination , the decolorization rate more than 99% . While Acid Blue dye wastewater, acid yellow dye wastewater decolorization study also achieve good treatment effect.