Anti-Bacterial Agents - toxicity, Biofilms - drug effects, China, chlorophyll, Drug Residues - toxicity, enzyme, EPS, Extracellular Polymeric Substance Matrix - chemistry, fluorinated antibiotic, fluoroquinolone, Fresh Water - chemistry, Ofloxacin - toxicity, Thiamphenicol - analogs & derivatives, Thiamphenicol - toxicity