How should ammonia nitrogen be removed from wastewater

Biological method mechanism - biological nitrification and denitrification mechanism: in the biological denitrification of sewage treatment process, in aerobic conditions through the role of aerobic nitrifying bacteria, the ammonia and nitrogen oxidation of sewage into nitrite or nitrate, in anoxic conditions using denitrifying bacteria (denitrifying bacteria) will be reduced to nitrogen and nitrite and nitrogen gas and Escape from the sewage. Thus, the biological denitrification of sewage includes two stages of nitrification and denitrification.

A/O system: A/O denitrification and phosphorus removal system, i.e., anoxic, aerobic denitrification and phosphorus removal system, is mainly developed by the United States, South Africa and other countries in the 1970s with the removal of nitrogen pollutants in wastewater process, at the same time, also has a certain effect on the dephosphorization, A/O system process is simple, easy to run and manage, and easy to use the original plant alterations to improve the quality of the effluent water.

Expanded information:

Note:

Life wastewater quality is usually relatively stable, and general treatment methods include acidification, aerobic biological treatment and disinfection. And industrial wastewater should be based on the specific water quality to make a reasonable choice of process.

Special point to note is that, for the use of aerobic biological treatment process for wastewater treatment, pay attention to the biochemistry of wastewater, usually requires COD / BOD5> 0.3, such as can not meet the requirements, can be considered to carry out anaerobic biological hydrolysis and acidification, in order to improve the biochemistry of wastewater, or to consider the use of non-biological treatment of physical or chemical methods, etc..

People's Daily Online - Cracking the 6-year problem of exceeding the ammonia nitrogen standard in the Liaohe River Basin