This invention discloses a decentralized
airlift reoxygenation circulating biological
denitrification wastewater treatment device, employing an integrated inner and outer cylinder design, encompassing
wastewater treatment,
sludge-water separation, and
discharge, with a complete process and reasonable structure. The area between the inner and outer cylinders forms a circular
wastewater treatment zone with circulating flow, encompassing a two-stage AO biological
denitrification process. It eliminates the need for
nitrification liquor recirculation, exhibiting excellent
denitrification effect, resistance to shock loads, and ease of management. The inner side of the inner cylinder serves as a
sedimentation zone, with periodic manual or mobile
sludge removal. An
airlift device provides circulation power and pre-
oxygenation; the circulating
water volume is adjusted by regulating the air supply, thereby controlling the
nitrification liquor recirculation ratio. The device consumes only one
air pump, which supplies air to both the
airlift device and the
aeration device, resulting in low investment, low
energy consumption, and easy management. Fixed supports and
rope-type
fiber packing are installed throughout the wastewater treatment zone, effectively preventing packing blockage and short-circuiting problems, and facilitating the timely
discharge of detached
biofilm.