The invention discloses a device for treating high-concentration
ammonia-
nitrogen wastewater in an
aeration-anaerobic circulation mode. The device comprises an oxygenating column, a water inlet pump, a
sludge reactor and a refluxing tank. An aerator is arranged at the bottom of the oxygenating column, a water distributing
pipe is arranged at the bottom of the
sludge reactor,
oxygen-dissolved
wastewater is pumped into the water distributing
pipe through the water inlet pump, the refluxing tank is communicated with the oxygenating column, and gas generated by purifying the
wastewater pushes the wastewater into the refluxing tank, the wastewater then flows into the oxygenating column to be oxygenated again, and circulating purifying is achieved. According to a wastewater treatment method, the
oxygen dissolved in the denitriding process can only be supplied by
oxygen dissolved in a
water body, accurate supply control over electronic acceptors is achieved, it is guaranteed that
ammonia nitrogen can only be converted into
nitrite nitrogen, a proper environment is provided for smoothly carrying out the anaerobic
ammonia oxidation process in the same reactor, the defect that an original anaerobic ammonia oxidation technology is quite prone to insufficient
aeration or excessive
aeration is overcome, the electronic acceptors are properly supplied in the denitriding process, and
ammonia nitrogen in the wastewater is stably removed.