Tubular microfiltration membrane Diaphragm separating equipment： Nitrogen in wastewater is found in four forms: organic nitrogen, ammonia nitrogen, nitrite and nitric acid. Organic nitrogen and ammonia nitrogen are the main sources of sewage, which are all derived from proteins in people's...
Tubular microfiltration membrane Diaphragm separating equipment：
Nitrogen in wastewater is found in four forms: organic nitrogen, ammonia nitrogen, nitrite and nitric acid. Organic nitrogen and ammonia nitrogen are the main sources of sewage, which are all derived from proteins in people's food. The organic nitrogen in fresh sewage containing nitrogen accounts for 60% of total nitrogen and about 40% ammonia nitrogen. ammonia nitrogen.
biological nitrogen removal
(1) biological nitrogen removal mechanism
Biological denitrification is the process of converting organic nitrogen and ammonia nitrogen into N2 and N20 gases under the action of microorganisms.
The two processes include nitrification and denitrification.
The nitrification reaction is the process of converting NH4+ into NO2- and NO3- in aerobic conditions.
The action is done by the two bacteria of nitrite and nitric acid bacteria.
These two kinds of bacteria belong to the autotrophic microorganism.
The reaction is as follows:
NH4 + + o2 = NO3-2 + 2 h + + H2O
Nitrifying bacteria are self-raising bacteria and have low growth rate and are sensitive to environmental changes.
Temperature, dissolved oxygen, sludge age, pH, organic load, etc.
Nitration of optimum temperature is 20 ℃ ~ 30 ℃.
Below 15 ℃, the reaction rate drops rapidly, 5 ℃ reaction almost completely stop.
Since nitrifying bacteria are autotrophic bacteria, if the value of BOD5 in water is too high, it will help the rapid proliferation of anaerobic bacteria, and the proportion of nitrifying bacteria in microorganisms decreases.
The growth generation cycle of nitrifying bacteria is longer, and in order to ensure the effect of nitrification, mud age should be more than twice the minimum age of nitrifying bacteria.
The nitrification reaction has a higher requirement for dissolved oxygen, and the dissolved oxygen content in the treatment system should be kept above 2mg/L.
In addition, in the process of nitrification, H+ is released and the pH value decreases.
Nitrifying bacteria are sensitive to the pH value, and in order to maintain an appropriate pH value of 7-8, adequate alkalinity should be maintained in the wastewater to adjust the pH value.
1g ammonia nitrogen (N meter) nitrification, need alkalinity (in CaCO3) 7.1 g.
The denitrification reaction refers to the process of reducing nitrate nitrogen (NO3-) and nitrite NO2- to nitrogen without oxygen.
The reaction is as follows:
Co2 6 no3 - ch3oh + 5 = 5 + 3 n2 + 7 h2o + oh - 6
Anti-nitrifying bacteria is heterotrophic and anaerobic, and when it exists, it will use O2 as the electron acceptor for aerobic respiration.
In the absence of oxygen and the presence of O3- or N02- e, N03- or N02- is the electron acceptor, with the organic carbon as the electron donor and nutrient source for the denitrification reaction.
In denitrifying bacteria metabolic activity at the same time, along with the growth of denitrifying bacteria, the bacteria synthesis process, the denitrification reaction, the biggest problem is the sewage can be used for denitrification in the amount of organic carbon and its biochemical level.
When the sewage is BOD5 / TKN>3 ~ 5, the carbon source is considered sufficient.
Different organic carbon will lead to different denitrification rates.
Carbon sources can be divided into three categories according to their sources:
In addition, carbon source and methanol are adopted, because methanol is decomposed into CO2 and H20, which does not produce other refractory intermediates, but its costs are higher.
The organic carbon contained in the original water;
Endogenous breathing carbon source - the native material and the organic matter stored in the bacteria.
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