| Printing and dyeing wastewater discharge is large,and with the rapid development of the dye industry and the progress of finishing technology,new auxiliaries,dyes,finishing agents,etc.are widely used in the printing and dyeing industry,resulting in more complex dye intermediates in the printing and dyeing wastewater.Due to the complexity of its components,the high chroma,high toxicity,and high concentration of this type of wastewater,the difficulty of its treatment has increased.2-Amino-4-acetamido anisole(AMA for short)is one of them,and the main downstream products are Disperse Deep Blue HGL,Disperse Blue 79 and other dyes.Due to the long production line,waste water will be generated in the processes of nitrification,reduction,centrifugation,etc.The waste water contains a large amount of 2-amino-4-acetamidoanisole and its by-products,and the waste water contains high COD and color.The use of a single treatment method often fails to completely remove contaminants or leads to higher treatment costs.This topic takes the mother liquor water of a dyeing and chemical company in Ningxia as the research object,adopts resin adsorption and nano-Fe3O4 type Fenton method to treat the production wastewater of 2-amino-4-acetamido anisole,and conducts the corresponding removal mechanism research.In static adsorption experiments and adsorption isotherm experiments,the experimental results show that XDA-11 macroporous adsorption resin has a better treatment effect on AMA wastewater,and the adsorption characteristics of the resin for AMA,COD and chromaticity in wastewater conform to the Freundlich isotherm adsorption equation.Through the dynamic experiment-single factor experiment,the adsorption effect of the resin was obtained with the unit gradient of each factor.The response surface method based on the single factor experiment was used to optimize the treatment conditions.The experimental results show that the three factors of temperature,pH and flow rate interact significantly in the process of resin adsorption and removal of AMA.The optimized process conditions are: the flow rate of the adsorption solution is 1.84 m L/min,the pH is 4.39,and the temperature is 23.08?.In static adsorption experiments and adsorption isotherm experiments,the experimental results show that XDA-11 macroporous adsorption resin has a better treatment effect on AMA wastewater,and the adsorption characteristics of this resin for AMA,COD and chromaticity in AMA wastewater are in line with Freundlich isotherm adsorption.equation.Through the dynamic experiment-single factor experiment,the adsorption effect of the resin changes with the unit gradient of each factor,and the treatment conditions are optimized by the response surface method based on the single factor experiment.The experimental results show that the three factors of temperature,pH and flow rate interact significantly in the process of resin adsorption and removal of AMA.The optimized process conditions are: adsorption fluid flow rate 1.84 m L/min,pH 4.39,temperature 23.08?.The effluent adsorbed by the resin was used as the feed water of the nano-Fe3O4-like Fenton method,and compared with the Fe SO4-catalyzed Fenton system to treat AMA wastewater in parallel,the results showed that the nano-Fe3O4-like Fenton system had a significant effect on the treatment of AMA wastewater and the system was significantly better than the Fe SO4-catalyzed system Fenton system.In the same way,single factor experiment and response surface experiment were carried out,and the optimal reaction conditions of Fenton method were as follows: nano Fe3O4 dosage was 1.70 g/L,H2O2 dosage was 53.52 mmol/L,pH was 5.14 and reaction time was 388.97 min.By measuring the mass spectra of nano-Fe3O4 catalyzed by H2O2 in Fenton-like treatment of AMA wastewater at different time periods,the degradation path and mechanism of AMA were calculated,which provided guidance for follow-up research and actual AMA wastewater treatment. |
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