The invention relates to a circulation reoxygenation biological
decomposition-reinforced riverway water purification
system and an implementing method thereof. The
system is suitable for water-qualitylong-acting treatment on a still water riverway or an organic
pollutant-enriched black and odorous water riverway. The
system consists of a muddy sand
sedimentation area, a multi-stage water fall reoxygenation unit, a primary
sedimentation pool and a riverway biological
settling bed treatment unit. The riverway biological
settling bed treatment unit consists of multiple groups of biological
settling beds which are arranged on the bottom surface of a
river bed at intervals along the water flowing direction. After the upstream river is settled and purified by the muddy sand
sedimentation area,the riverway water is further decomposed and purified on the biological settling
bed treatment unit by biological
flora attached to biological fillers; meanwhile, the riverway water returns to the primary sedimentation
pool through a water-collecting and water-returning
pipe network on the bottom layer, the riverway water is lifted to the multi-stage water fall reoxygenation unit by a water pump,is subjected to biological purification and reoxygenation treatment again and then flows back to the riverway, and so one and so forth, the riverway water is gradually purified, the ecological chain of the riverway is recovered, and the aim of reinforcing the
ecological self-cleaning ability of the riverway water is finally fulfilled.