Research On Degradation Of Organic Pollutants By Broad-spectrum Photothermal Catalysis Coupled With Microbial Method

With the development of the pharmaceutical industry in recent years,the increasing production of cephalosporin antibiotics has led to an increase in the discharge of antibiotic wastewater,which has caused serious pollution to the environment.At present,there are photocatalytic degradation technologies to solve the problem of organic pollutants of cephalosporin antibiotics,but there are problems of high treatment costs and incomplete mineralization.Biodegradation is also a common technology for the treatment of organic pollutants,but due to the bactericidal characteristics of cephalosporin toxicity,biodegradation is difficult to complete the treatment of organic pollutants alone.In view of the shortcomings of treatment technology,this paper combines the advantages of photocatalytic degradation technology and biodegradation technology,and develops a double-function nest-like microreactor,which is photothermal catalytic coupling microbial technology.The removal performance of organic pollutants by photothermal catalytic coupling microbe method was tested,and the test results were studied and analyzed.The main research has the following aspects:?1?The Ag doped black Ti O₂nanometer photocatalyst was synthesized by hydrothermal method,photodeposition method and solid state reduction method,which was expressed as Ag-Ti O_2-x.Ag-Ti O_2-x/PUF carrier was prepared by ultrasonic impregnation with polyurethane foam?PUF?.By means of XRD,UV-vis,Raman,TEM,XPS and SEM the element composition,crystal structure,optical absorption range and morphology of the catalyst were studied,and the photocatalytic degradation performance of Ag-Ti O_2-x/PUF was tested.The degradation effect of Ag-Ti O_2-x/PUF in different concentrations of organic pollutants and the influence of different conditions on the removal rate were studied,so as to determine the optimal concentration and conditions of organic pollutants,the removal rate of organic pollutants by Ag-Ti O_2-x/PUF is 81%.?2?The pretreated PUF carrier was placed in a photocatalytic circulating bed biofilm reactor?PCBBR?.The biofilm was formed in the PUF carrier through inoculation,culture and domestication.The activity and quantity of microorganisms in the carrier were observed by means of SEM and biomass.The removal rate of biodegradable organic pollutants in the carrier was tested,the effect of microbial degradation in different concentrations of organic pollutants and the influence of different conditions on the removal rate were studied,so as to determine the optimal concentration and conditions of biodegradable organic pollutants,the removal rate of organic pollutants by biodegradation is 47%.?3?Ag-Ti O_2-x/PUF vectors were prepared by hydrothermal method,photodeposition method,solid state reduction method and ultrasonic impregnation method,and then placed in a reactor for inoculation,culture and domestication,to produce a photothermal catalytic coupling microbial system with double functions.The degradation performance of the photo-catalytically coupled microbial system for organic pollutants was tested and compared with the photo-catalytic and microbial degradation under the same conditions.The results showed that the removal rate of organic pollutants was 96.1%,respectively 1.8 times and 1.2 times higher than microbial and photocatalytic degradation alone.