The article is dedicated to studying the effectiveness of wastewater treatment contaminated with chloramphenicol using Lemna minor with a specific biomass of 36 and 50 g/L. Purification of model solutions with an antibiotic concentration of 2-20 mg/L continued for 1-72 hours. The conducted research showed that the degree of chloramphenicol removal depends on the specific biomass of plants and the time of the process. The greatest decrease in the content of the antibiotic was observed during 24-48 hours of the purification process, then the efficiency of its removal decreased and after 72 hours it practically did not change. For concentrations of 2 and 5 mg/L with a specific biomass of L. minor of 36 g/L, the purification efficiency in 72 hours reached 23.2% and 26.8%, respectively. When the biomass increased to 50 g/L, the efficiency was 17% and 19%, respectively. The removal efficiency of chloramphenicol at a concentration of 10 mg/L reached 33% when the specific biomass of L. minor was 36 g/L, and at a concentration of 20 mg/L – 29.5%. For a specific biomass of 50 g/L, this indicator was 23.6% with an antibiotic content of 10 mg/L and 21% with a content of 20 mg/L. According to the obtained results, the rational parameters of the cleaning process were established: time 48 hours and specific biomass 36 g/L allowed to achieve 29.4% efficiency of chloramphenicol removal from wastewater at its initial concentration of 10 mg/L. Further increase in treatment time has a negligible effect on the increase in purification efficiency. An increase in duckweed biomass leads to a decrease in the efficiency of antibiotic adsorption. To process duckweed after its use in wastewater treatment to remove antibiotics fermentation technology in a methane tank can be employed along with other station waste.
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