Three main processes for the treatment of total nitrogen exceeding the standard

The nitrification reaction, that is, the oxidation of ammonia nitrogen to nitrate, is performed by two groups of autotrophic aerobic microorganisms through two processes.

Denitrification is the process of reducing nitrates and nitrites produced during nitrification to nitrogen gas.

The main process of total nitrogen removal 2/O process

A2/O process is the abbreviation of anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal process. In the aerobic section of the process, nitrifying bacteria will ammonia nitrogen and organic nitrogen in the inflow into ammonia nitrogen.

Through biological nitrification, it is converted into nitrate. In the anoxic section, denitrifying bacteria convert the nitrate brought in by the internal reflux through biological denitrification into nitrogen and escape into the atmosphere, so as to achieve the purpose of denitrification.

ditching process

The oxidation ditch process is also called oxidation ditch or circulating aeration tank, which is a modification of the activated sludge process. It uses a continuous reaction tank as a biochemical reactor in which the mixed liquid flows continuously.

The oxidation ditch uses a direction-controlled aeration and agitation device to transmit a horizontal velocity to the mixture in the reactor, so that the agitated mixture circulates in the closed channel of the oxidation ditch.

BR process

SBR is the abbreviation of sequential batch activated sludge process. The operation of SBR is different from the traditional activated sludge method, which generally adopts the method of intermittent operation of multiple SBR reactors in parallel.

The main feature of the SBR process is the use of sequential and batch operation. For a single SBR reactor, each operating cycle includes 5 stages: water inflow period, reaction period, sedimentation period, drainage and sludge discharge period, and idle period.