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How should ammonia nitrogen be removed from water?

by:BOQU     2023-03-29
The following are some measures to remove ammonia nitrogen in water for reference: 1. Nitrification and denitrification Ammonia (NH3) is oxidized to nitrous acid by nitrosifying bacteria, and nitrous acid is oxidized to nitric acid by nitrosifying bacteria, which is called nitrification, and nitrification requires consumption Oxygen, when the concentration of dissolved oxygen in water is lower than 1-2 mg/L, the speed of nitrification is significantly reduced. In the absence of dissolved oxygen in water, denitrifying bacteria are able to reduce nitric acid to nitrous acid, hyponitrous acid, hydroxylamine or nitrogen. This process is called nitric acid reduction. When the gaseous nitrogen formed is released as a metabolite and is lost from the system , it is called denitrification. 2. Absorption by algae and plants Because algae and aquatic plants can use ammonium (NH4+) to synthesize amino acids, the absorption of ammonia nitrogen by algae is the main method for removing ammonia nitrogen in ponds. The reduction and death of algae in winter will significantly increase the ammonia nitrogen content in water . 3. Volatilization and sediment absorption In ponds with high ammonia nitrogen concentration, high pH value, aeration measures, wind and waves, agitated water flow, etc., it will be conducive to the volatilization of ammonia nitrogen. The anions in the bottom mud soil can bind ammonium ions (NH4+). When pulling the net or similar operations that cause bottom agitation, the sediment at the bottom of the pond will be temporarily suspended in the water, and the ammonium ions (NH4+) will be released. 4. Mineralization and return to the organism The so-called mineralization means that part of the ammonia nitrogen exists in the soil at the bottom of the pond in the form of organic matter, and these organic matter decomposes and then returns to the water. The decomposition rate depends on temperature, pH, dissolved oxygen and organic matter quantity and quality. Entering the body of aquatic animals means that when the concentration of ammonia nitrogen in the water is high, ammonia (NH3 instead of NH4+) can enter the body of aquatic organisms through the gills.
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