What is Anaerobic Ammonia Reaction? Advantages of anammox technology and its controlling factors

The anammox reaction is carried out under anaerobic conditions with ammonia as an electron donor and nitrate or nitrite.

As an electron acceptor, ammonia is oxidized to nitrogen, and this reaction saves more than 60% of oxygen supply compared with the whole process of nitrification (ammonia oxidation to nitrate).

In the traditional biological denitrification process, nitrogen removal is achieved through two separate processes: nitrification and denitrification. Traditionally, nitrifying bacteria are mainly autotrophic bacteria and require high dissolved oxygen in the environment.

And denitrifying bacteria.

On the contrary, heterotrophic bacteria are the main ones and are suitable for growing in an anoxic environment. Therefore, it is difficult to envisage that both nitrification and denitrification processes can be carried out in the same reactor at the same time.

Anaerobic ammonia oxidation reaction refers to the biological process in which anaerobic ammonia oxidizing microorganisms use NO2--N as electron acceptor and NH4+-N as nitrogen under anaerobic or anoxic conditions.

The first step of the sharon section, 50 60% ammonia nitrogen.

It is oxidized to nitrous nitrogen, and in the second step of the anammox section, the remaining ammonia nitrogen undergoes anaerobic ammonia oxidation reaction with the newly generated nitrous nitrogen to generate nitrogen, and part of the nitrate nitrogen is generated, and the two stages of the reaction are completed in different reactors.

The combination of Sharon and Anammox processes only needs to convert 50% of ammonia nitrogen into nitrous nitrogen, and there is no need to add nitrous nitrogen subsequently, and most anaerobic effluents contain alkalinity present in bicarbonate to compensate for the alkalinity consumption caused by nitrosation and achieve process alkalinity self-balancing.

At the same time, the process generally separates the nitrosation and anaerobic ammonia bacteria in two different reactors, or sets different conditions in one reactor at different times, so that the two types of bacteria can act separately, realize the phase treatment, provide a good environment for the growth of functional bacteria, and reduce the inhibitory effect of harmful substances in the inlet water on the anaerobic ammonia bacteria.

The combined Sharon-Anammox process is simple to operate, has a high treatment load, low oxygen demand in the nitrosation section, and a pH value.

It has a wide range of requirements, and it is an excellent emerging denitrification process, which has great research and application value.

The anammox reaction is a reaction of chemoautotrophic bacteria, commonly known as anammox. The simple formula is: 1NH4+ +1NO2- N2 + 2H2O. If the microorganism itself is added to the chemical equation, it is:

1nh4+ +hco3- +no3- +

The bacterium is autotrophic and requires only CO2, an inorganic carbon source, and plays an important role in the global carbon cycle. At present, the ammonia nitrogen treatment of sewage is widely promising. However, because the nitrite content is not significant enough in most wastewater, the Anammox technology should be used in combination with other technologies, such as the Sharon+Anammox process, which has been put into production in Rotterdam, the Netherlands, which combines short-range nitrification and anammox oxidation processes, which is relatively successful.

In short, anaerobic microorganisms use carbon dioxide and ammonia as the main materials for redox reaction, like light and action, which is one of the ways for organisms to absorb energy, and generate nitrate nitrite, which belongs to chemical energy reaction.

Nitrite acts as an electron acceptor and is a biological reaction process that oxidizes ammonia nitrogen to nitrogen.

In an anoxic environment, ammonium ions (NH4) are oxidized to nitrogen with nitrite (NO2).

Hello dear, the advantages of anaerobic ammonia oxidation technology and its control factors: anaerobic ammonia oxidation is the current mainstream application process (Academician Peng Yongzhen's short-range denitrification will not be introduced for the time being). Anammox is a biological reaction that produces nitrogen and nitric acid under anaerobic conditions, with ammonia as the electron donor and nitrite as the electron acceptor. Anammox consists of two processes:

The first is decomposition (capacity) metabolism, that is, ammonia is used as an electron donor and nitrite is used as an electron cavity, and the two react in a ratio of 1:1 to generate nitrogen, and store the energy produced in the form of ATP; The second is anabolism, that is, nitrite is used as an electron acceptor to provide reducing power, and the carbon source carbon dioxide and ATP produced by catabolism are used to synthesize cellular substances, and nitrate is produced in the process. Anaerobic ammonia oxidation bacteria (anaob) are the implementers of anaerobic ammonia oxidation.

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Answer]: C hints Anaerobic ammonia oxidation is a biological reaction process in which anaerobic ammonia is used as an electron acceptor to transport ammonia nitrogen oxidation branches into nitrogen under anaerobic conditions.

Anaerobic ammonia oxidation is a biological reaction process in which ammonia nitrogen is oxidized into nitrogen by anaerobic ammonia bacteria using nitrite as an electron acceptor under anaerobic (to be precise, hypoxia, because of nitrite). This reaction is usually demanding on external conditions (pH, temperature, dissolved oxygen, etc.), but because it does not require the participation of oxygen and organic matter, this reaction has sustainable significance for its research and process development.