How can total nitrogen be achieved? As the saying goes, 'Know yourself and know the enemy, and you can win a hundred battles.' To fight against the total nitrogen in sewage, only by understanding the principle of nitrogen removal can we be targeted. At present, the more economical and environmentally friendly denitrification method is biological denitrification, which mainly includes three processes of ammonification, nitrification and denitrification, and is jointly completed by ammonification, nitrification, denitrification and microbial assimilation of organic nitrogen. 1. Ammonification: Ammonification bacteria decompose and convert organic nitrogen in water into ammonia nitrogen. Ammonification can not only convert organic nitrogen into ammonia nitrogen, but also improve the biodegradability of sewage. 2. Nitrification: It needs to be carried out under aerobic conditions. First, the nitrosifying bacteria in the water oxidize ammonia nitrogen into nitrite nitrogen, and then further oxidize it into nitrate nitrogen under the action of nitrifying bacteria. The growth rate is slow, so the sludge age is required to be longer, which is also the main reason why the aerobic tank of the sewage treatment plant usually has a large volume and a long aerobic hydraulic retention time. 3. Denitrification: Under anoxic conditions, the nitrite nitrogen and nitrate nitrogen produced by nitrification are reduced to nitrogen or other forms of gaseous nitrogen by denitrifying bacteria. It is emphasized here that nitrate nitrogen is a 'stubborn molecule' in total nitrogen. To achieve total nitrogen removal, denitrification must be performed. The above three processes are widely used in biological denitrification. In addition, scholars also have other explorations in the direction of biological denitrification, such as short-range nitrification and denitrification, and anaerobic ammonium oxidation. How to make the total nitrogen reach the standard at a low cost and stably? Bioaugmentation + carbon source + on-site debugging = total nitrogen up to standard! 1. Bioenhancement: The method of biological denitrification is to cultivate the microorganisms existing in the water plant itself, promote the growth and reproduction of the indigenous microorganisms, and guide them to exert a good degradation effect. Shocks occur frequently, which makes the biochemical system fragile. If it is not repaired in time and left to fend for itself, it is very likely to cause system collapse. If the system itself is only used for recovery, it will take as little as one month and as long as half a year, causing the back-end of the water plant to Processing costs remain high. In order to quickly restore the shock and stabilize the biochemical system, bioaugmentation technology can be involved. This technology refers to introducing high-efficiency strains with specific functions into the traditional biological treatment system to increase the concentration of effective microorganisms and improve the microbial flora structure of the system. Rapid increase in degradation rate and system stability. 2. The charm of carbon sources: Biological denitrification can be understood as a war between microorganisms and nitrogen-containing pollutants. Soldiers cannot fight hungry, and microorganisms cannot fight pollutants hungry. They must be fed and drunk Only when they are satisfied can they inspire their infinite fighting spirit! What do denitrifying microorganisms like to eat? Organic carbon source! At present, there are many types of carbon sources on the market. Sodium acetate is commonly used. Although the effect is good, the biggest disadvantage is that it is expensive, and the second is that it is easy to crystallize and precipitate solid crystals in a low temperature environment! The fathers of the water plant's gold owners said that if they continue to eat, Jinshan will also be eaten up! The second is glucose. Long-term use will easily lead to sludge bulking; flammable and toxic organic solvents such as methanol have gradually withdrawn from the market. Isn’t there no delicious, cheap, safe and stable carbon source? Of course, in the face of this market demand, various new carbon sources, composite carbon sources, and denitrifying nutrients have sprung up, but the quality is uneven. The problems mainly focus on several aspects: poor use effect, cost , chromaticity, freezing point, storage, etc. It is more reliable to choose products developed by companies with biotechnology backgrounds. 3. On-site commissioning + post-maintenance: How to command the army of microorganisms to win the battle of total nitrogen depends on the 'generals' in charge of on-site commissioning, that is, the team of technical engineers. The management ability of the biochemical system determines the quality of the biochemical system. processing power. How to adjust in response to water quality changes, temperature changes, and pollutant impacts? How to respond to emergency situations? Excellent technical engineer team is very important!