title: The operation of two EGSB reactors under the application of different loads of oxytetracycline and florfenicol.
abstract: This study evaluated the effect of the antibiotics oxytetracycline (OTC) and florfenicol (FLO) on the operation of two EGSB (expanded granular sludge bed) reactors. The experiment was conducted for 210 d in reactor R1 and 245 d in reactor R2. The reactors were inoculated with granular sludge from a upflow anaerobic sludge blanket (UASB) reactor on a local dairy farm. The sludge had an average pellet size of 2.35 mm, good sedimentability and a high percentage of organic material. The antibiotic tolerance and the inhibitory action on the bacterial population were different for each antibiotic studied. The results showed a more severe inhibitory effect on microorganisms that were in contact with increases in loads of FLO than those that were in contact with increasing loads of OTC, a condition reflected in the chemical oxygen demand (COD) removal efficiency.
authors.affiliation: The University of Antioquia, Diagnostics and Pollution Control Group, Medellin, Colombia. yudyandrea@gmail.com
authors.forename: Yudy Andrea
authors.initials: YA
authors.lastname: Londoño
authors.forename: Diana Catalina
authors.initials: DC
authors.lastname: Rodríguez
authors.forename: Gustavo
authors.initials: G
authors.lastname: Peñuela
mesh_terms: D000468:Alkalies / Q000737:chemistry; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D006863:Hydrogen-Ion Concentration; D008826:Microbial Sensitivity Tests; D008855:Microscopy, Electron, Scanning; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis; D010118:Oxytetracycline / Q000032:analysis* / Q000494:pharmacology; D010758:Phosphorus / Q000032:analysis; D012722:Sewage / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects; D013839:Thiamphenicol / Q000031:analogs & derivatives* / Q000032:analysis / Q000494:pharmacology; D014865:Waste Disposal, Fluid
chemical_list: D000468:Alkalies; D009930:Organic Chemicals; D012722:Sewage; D010758:Phosphorus; C035534:florfenicol; D013839:Thiamphenicol; D009584:Nitrogen; D010118:Oxytetracycline