The present invention is to install a sediment concentrate bar with an air pumping pipe in the contaminated water stagnant for a long time, such as freshwater lakes or lakes while forcibly and continuously supplying compressed air through the air pumping pipe to improve the water quality It relates to aeration and sediment removal device of the freshwater lake using an air pump to remove the sediment deposited on the bottom surface of the water, sediment concentration barge 100 of the water quality improvement device is provided in a cylindrical shape a plurality of connections Upper and lower buoys connected to (11) and having buoyancy chambers 14, 21, 21a, 21b and 21c respectively provided with outlets 12 in the circumferential direction therebetween and providing buoyancy therebetween. (10) (20); A three-stage strainer (13) (13a) (13b) provided in the space of the outlet (12) in three circumferential directions and allowing the sediment with particles to pass through the water to be collected and dropped to the lower portion thereof; A sediment collection chamber (50) provided integrally with the lower portion of the lower bar line (20) and having a lower surface sealed to collect sediment that is caught and dropped by the strainer (13) (13a) (13b); An air pumping pipe 30 having a cylindrical shape having an upper portion opened in a center portion of the sediment concentrate portion 100 and having a discharge hole 31 in a circumferential direction thereof and having a guide member 34 on an outer surface thereof; A cross-shaped compressed air jet port 33 provided at a lower portion of the air pumping pipe 30 and connected to an external air compressor and a supply hose 32 to supply compressed air; The lower portion of the air pumping pipe 30 is provided with a sediment absorber 40 which is connected as a suction hose 41 and contacts the bottom surface to guide the suction of the bottom surface.
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