Study On The RemovAl Of TypicAl Antibiotics In ActivAted CArbon CrAfts And Antibiotic ResistAnce Gene

In recent years, antibiotics was detected in water environment in many developed countries and regions.There are mang reports show antibiotics and other drugs have been found in drinking water coverage in the U.S., Canada, Germany, France, Finland and other developed countries. That long-term drinking water containing trace amounts of antibiotics and other drugs pose a threat to human health, has attracted attention worldwide. Our country is one of the largest production and use of antibiotics country. Studies have shown that the drug testing on the Pearl River in Guangzhou, Shenzhen River, the Yellow River and other rivers in the discovery of antibiotics, and antibiotic content is higher than most developed river United States, Europe and other drug content. Antibiotics longstanding produce impact on the water environment inevitably,and impact on existing drinking water treatment process results.While organism is a adaptable creatures, water longstanding antibiotics is likely to lead to changes in microbial genes in the body, leading to enhanced microbial resistance, and will have a significant impact on drinking water disinfection. Therefore, the study of the problem of antibiotic and antibiotic resistance genes and the water environment is imminent.In this paper, the activated carbon in the depth of water treatment process is for the study, analog activated-BAC process for raw water containing antibiotics treatment, and detect the bacteria in biofilm on BAC cultured Purification and analysis of the resistance gene. The study found:Powdered activated carbon has very good removal for some typical antibiotics. When the concentration of antibiotics in aquatic environment is500ng/L, the dosage of powdered activated carbon was24mg/L, adsorption time was1h, the powdered activated carbon for sulfamethoxazole, sulfamethazine, tetracycline, oxytetracycline, erythromycin pigment removal rate reached79.84%,80.05%,94.62%,83.32%,96.88%. Activated carbon adsorption antibiotics results according to the Freundlich adsorption isotherm model, and powdered activated carbon exhibit different absorption characteristics for different types of antibiotics.Choice three types of activated carbon column which with different activated carbon, Three kinds of activated charcoal column were fitted with new, A BAC water and activated carbon filter in water with antibiotics domesticated BAC,to research activated carbon biological activated carbon the effect to remove typical antibiotics. In the same HRT (EBCT of20min), the study of three kinds of carbon with a water column of the initial concentration of500ng/L removal of antibiotics. Experimental results show that both new biological activated carbon or charcoal antibiotic effect certain place, where the new charcoal on sulfamethoxazole, sulfamethazine, tetracycline, oxytetracycline and erythromycin removal were90.15%,86.23%,87.90%,79.68%and70.57%. A water activated carbon filter in the BAC for sulfamethoxazole, sulfamethazine, tetracycline, oxytetracycline and erythromycin removal were83.28%,80.56%,55.08%,70.17%and82.17%, BAC domesticated water with antibiotics for sulfamethoxazole, sulfamethazine, tetracycline, oxytetracycline and erythromycin removal were72.04%,69.34%,57.67%,49.78%and67.32%. Temperature has an important impact on activated carbon and biological activated carbon to remove some of the typical antibiotics, as the temperature decreases, activated carbon adsorption properties of antibiotics has increased, but the biological activated carbon material degradation ability of these organisms declined.BAC microorgAnisms mainly is composition of bacterial, dominAted by Gram-negative bacteriA, and there was not detected pathogens. Main groups of bacteria in BAC from the lower, middle and upper of biological activAted carbon column is bAsically the same, but the biomass decrease along the flow direction. Long-term Antibiotic-containing wAter can induce bacteria product antibiotic resistant gene in vivo that makes bacteriA resistant to antibiotics and anti-chlorine resistance Are enhanced,when the influent concentration of antibiotics was500ng/L, running five months after biochar biofilm resistance to antibiotics strength up to10mg/L, anti-chlorine strength up5mgCL2/L. When the water with antibiotics induce bacterial resistance gene with the under water without antibiotics long-term effects of the raw water, the resistance gene is very difficult to disappear. That resistance gene once produced, will be present in the environment, distribution and transmission,which is a new type of environmental pollutants.