What are the commonly used methods for degrading ammonia nitrogen?
1. Aeration and oxygenation method
Ammonia nitrogen and water can form hydrogen bonds. To let ammonia nitrogen escape from water, it must be done through strong light irradiation and strong aeration measures. For example, a reasonable arrangement of impeller aerators, waterwheel aerators, inflatable aerators or surge aerators in the pond can not only increase oxygen and aeration directly, but also make excess ammonia nitrogen escape from the water by stirring the water body. For ponds without complete oxygenation equipment, dry particle oxygen or oxygenation bottom modification can be used to promote the discharge of ammonia nitrogen from the water body. Industrial aquaculture can promote the decomposition and emission of ammonia nitrogen through activated sludge aeration tanks.
2. Pollution Reduction Act
Ammonia nitrogen itself is caused by nitrogen pollution, and effectively reducing water pollution can indirectly digest ammonia nitrogen. The sediment is the main polluted area. Regularly dry-spraying the particles to improve the bottom can decompose the organic pollutants in the sediment and reduce the generation and release of ammonia nitrogen in the sediment. When ammonia nitrogen is high and difficult to drop, the feeding amount of feed should be scientifically reduced. A small feeding amount can directly reduce the production of residual bait and feces, and at the same time, controlling the feed can achieve the effect of starvation and health care. Starvation improves the intestinal digestion efficiency, reduces the bait coefficient, and effectively controls the fecal pollution. In addition, manual filtration to remove residual bait and manure, regular drainage of bottom old water and filling of new water can also effectively reduce pool water pollution and achieve the purpose of effectively controlling ammonia nitrogen.
3. Probiotics
Probiotics are very important in aquaculture water environment, which have the function of fertilizing water and purifying water quality. Regularly sprinkle EM bacteria, photosynthetic bacteria, Bacillus, Enterococcus faecalis, lactic acid bacteria and other probiotics in the water body, which can decompose organic pollutants in the water, reduce the comprehensive toxins in the water body, and prevent the occurrence of diseases, especially the supplement of nitrifying bacteria and denitrifying bacteria, etc. It can promote nitrogen cycle and effectively control the excess of ammonia nitrogen in water.
4. Ecological regulation method
Supplementing microgreen algae and unicellular diatoms, such as chlorella, chlorella, chlorococcus, oocystis, etc., to aquaculture water can enrich the algal phase structure, maintain the algal phase balance, and help prevent and control ammonia nitrogen. Deploying aquatic plants in the aquaculture water environment, such as bitter grass, water spinach, water spinach, lotus root, and small algae, can also effectively reduce water pollution, clean the water environment, and control the soaring of ammonia nitrogen. Promoting the scientific polyculture model, allowing the mutual utilization of animal waste from farming, can reduce pollution, turn waste into treasure, comprehensively utilize it, prevent and control ammonia nitrogen, and improve farming efficiency.
5. Drug degradation method
(1) Suppress the pH value. The higher the pH value, the stronger the toxicity of ammonia nitrogen; the lower the pH value, the less toxic ammonia nitrogen is. The ammonia nitrogen in the pool water is high, and the pH value should be kept at 7.0~7.5. When the pH value is high, the pH value should be suppressed in time, and grape vinegar, fruit acid, lactic acid, citric acid or aquatic compound organic acid can be splashed more scientifically.
(2) Ion exchange method. In fish ponds with high ammonia nitrogen, a more active complexing agent can be sprinkled. When the ammonia nitrogen is complexed into a polymer, the toxicity is greatly reduced. For example, ammonia nitrogen can form copper ammine complex ions with copper ions, complex with zinc ions to form zinc ammine complex ions, and complex with silver ions to form silver ammine complex ions, etc., the toxicity is reduced, and the harm is greatly reduced.
(3) Adsorption mitigation method. Sprinkling non-toxic and non-irritating adsorbents in ponds with high ammonia nitrogen can effectively reduce the content of ammonia nitrogen in the water body and alleviate the harm caused by ammonia nitrogen. Symptoms of poisoning.
(4) reduction decomposition method. In ponds with long-term high ammonia nitrogen, a highly active reducing agent can be sprinkled, which can effectively decompose ammonia nitrogen or reduce the toxin of ammonia nitrogen to a minimum. For example, sprinkling sodium thiosulfate + Ⅴc can relieve ammonia nitrogen and comprehensively detoxify; Salt granules can also relieve ammonia nitrogen and comprehensively improve the bottom, etc., and have obvious effects of detoxification and food promotion after use.
