Study On The Treatment Of Copper And Nickel-Containing Printing And Dyeing Wastewater By Iron-Carbon Composite Enhanced SBR Process

With the rapid development of urban industry,the problem of treatment of printing and dyeing wastewater discharged from industrial production has become more and more serious.How to efficiently treat printing and dyeing wastewater and reduce pollutants in printing and dyeing wastewater has become a widely concerned issue.Traditional printing and dyeing wastewater treatment methods are mainly divided into coagulation sedimentation method,activated carbon adsorption method,membrane separation technology method,etc.With the continuous innovation of printing and dyeing wastewater treatment technology,activated sludge treatment technology,especially the sequencing batch activated sludge(SBR)process,has been popularized and applied.Many environmental researchers have improved the SBR process,which has significantly improved the treatment efficiency of printing and dyeing wastewater,such as biological activated carbon method,iron-enhanced SBR method,etc.These improved processes have achieved good results in improving the effect of pollutant treatment and the water environment.achievement.In this paper,a certain amount of activated sludge from the secondary sedimentation tank of the sewage treatment plant was used as the seed sludge,which was put into the SBR device for cultivation and domestication.iron-carbon complex.Taking Cu2++Ni2+ as the influencing factors,the effects of the iron/activated carbon concentration ratio in the iron-carbon composite,the dosage of the iron-carbon composite and the combination of SBR operating parameters on the treatment effect of printing and dyeing wastewater were explored under the condition of different concentrations of heavy metal ions.The kinetic process of functional microbial activity changes and matrix degradation was also analyzed.The experimental content can be divided into the following three parts:(1)Preparation of iron-carbon composite and determination of dosage.The ratio of iron to activated carbon and the dosage of the iron-carbon composite were determined by static experiments.The structural properties of the iron-carbon composite and the distribution of activated sludge on the iron-carbon composite were observed by scanning electron microscopy,and the physical properties of the prepared samples were characterized..The results show that when the iron/activated carbon concentration ratio is 2:1 and the concentration of iron-carbon composite is 10 g/L,the prepared iron-carbon composite has the best effect on wastewater treatment.(2)Optimization of process parameters of iron-carbon composite strengthening SBR process.Coupling iron-carbon composite and SBR method,and adjusting the operating parameters of the coupling process,to investigate its effect on the treatment of printing and dyeing wastewater.The results show that: when the concentration of heavy metal ions is 2 mg/L Ni2+,the combination of process parameters that should be selected is 3 mg/L dissolved oxygen content,1/5water filling ratio,and 20 carbon-nitrogen ratio of influent water;when the heavy metal ion concentration is 2 mg/L Cu2++5 mg/L Ni2+,the selected process parameters are 3 mg/L dissolved oxygen content,1/4 water filling ratio,and 20 influent carbon-nitrogen ratio;when the concentration of heavy metal ions is 5 mg/L Cu2++10 mg/L Ni2+,the combination of process parameters that should be selected is 3 mg/L dissolved oxygen content,1/5 water filling ratio,and20 influent carbon-nitrogen ratio.(3)To explore the kinetic changes of microbial activity and matrix degradation during the degradation of heavy metal-containing printing and dyeing wastewater by iron-carbon composite enhanced SBR process.By measuring the change of the specific oxygen consumption rate(SOUR)of microorganisms in the activated sludge before and after adding the iron-carbon complex,and establishing the mathematical formula of the substrate removal rate and the specific growth rate constant of the microorganisms inhibited by heavy metal ions,the effect of the iron-carbon complex on the The effect of functional microbial activity was investigated to find out the mechanism of iron-carbon composite coupled with SBR process to degrade heavy metal-containing printing and dyeing wastewater.