▎ 摘　　要

NOVELTY - Biological filtration device comprises an outer cylinder (1) and an inner cylinder (2). The inner cylinder is made up of transparent material. The inner cylinder is nested inside the outer cylinder. An annular chamber is formed between the outer cylinder and the inner cylinder. One end of the inner cylinder is connected with the annular chamber. The other end is connected to the outlet pipe. A light source (3) is set in the annular cavity. The outer cylinder is connected to the water inlet pipe. The water inlet pipe and the water outlet pipe are located at the same end of the biological filtration device. The Chlorella is suspended in the outer cylinder. The inner cylinder is filled with polyether polyurethane-graphene oxide complex foam with artificial membrane. USE - The device is useful for treating trace amounts of antibiotic wastewater. ADVANTAGE - Used as a biological filtration device. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the biological filtration device (Drawing includes non-English language text). Outer cylinder (1) Inner cylinder (2) Light source (3)