Removal Of Common Antibiotics In Drinking Water Treatment Processes

With the rapid development of social economy and the development of animal husbandry and aquaculture,the types and dosage of antibiotics have increased significantly.The use of antibiotics can enter the water environment through a variety of ways.In recent years,the successive detection of antibiotics in the waters of our country has threatened the safety of drinking water sources.It is very necessary due to the pseudo persistence of antibiotics and the potential threat to public health.Detection of existing antibiotics in water sources,assessment of existing water treatment processes for removal of antibiotics in water bodies,and improvement of water treatment processes for the removal of emerging pollutants are of considerable practical and social importance.In this study,combined with solid-phase extraction and ultra-high performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS)methods,the conventional water treatment process of effluent(pre-ozone,flocculation sedimentation tank,carbon sand filter,After the membrane filtration tank and chlorination disinfection)sampling points were set up and samples were taken at different times for 34 target antibiotics(including sulfonamides,tetracyclines,flurorones,macrolides,?-amides,and others)Classes,etc.,represented the study of the drinking water process for the removal of antibiotics.The water sample was first extracted with a 0.45 ?m glass membrane filter before injection,and then the solid phase extraction concentration and purification steps were performed using an Oasis HLB column(6 ml,500 mg).The results showed that a total of 27 antibiotics were detected in the raw water,and the highest concentration of sulfa antibiotics was detected at a concentration of 0.04 to 9.97 ng/L.Ozone oxidation and chlorination almost eliminate most of the content of most of the tested antibiotics.The removal rate of ozone-oxidation removal of sulfanilamide antibiotics is up to 91%,and the removal of sulfonamide antibiotics by chlorination is up to100%.Membrane filtration followed(up to 75% relative removal).Activated carbon and sand filter filtration and flocculation reaction units have a poor removal effect on sulfa antibiotics.Among the six types of antibiotics,the removal of sulfa drugs was generally better,and the fluoronosterones and ?-amides were generally weaker(relatively only 27%after chlorination).Different types of antibiotic removal rates were also different(pre-ozone had the lowest sulfonamide removal rate of 78%,while tetracycline removal was the lowest at 8%).Due to the large number of antibiotics in the water body,the experiment simulates real water bodies,inputs a quantitative solution of five sulfonamide antibiotics,and utilizes the strong oxidizing and flocculating effects of ferrate to remove ferric salts from sulfanilamide antibiotics.Trying to find a new combination of water treatment process to improve the removal efficiency of emerging pollutants,experiments show that the addition of ferrate in the 10 min sulfa antibiotic removal rate can reach 90%.