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Makinggreen Knowledge Classroom: What are the hazards of ammonia nitrogen wastewater?

Time : 2020-04-15

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Makinggreen Knowledge Classroom: What are the hazards of ammonia nitrogen wastewater?

With the continuous development of industry, our environment is getting more and more attention. Next, Making Green Environmental Protection will introduce the source and harm of ammonia nitrogen wastewater, let's go to understand it together.

The ways in which nitrogen-containing substances enter the water environment mainly include natural processes and human activities. The natural sources and processes of nitrogen-containing substances entering the water environment mainly include precipitation and dust reduction, non-urban runoff and biological nitrogen fixation.

Human activities are also an important source of nitrogen in the water environment, mainly including untreated or treated urban domestic and industrial wastewater, various leachate and surface runoff.

Synthetic chemical fertilizers are the main source of nitrogen nutrients in water. A large amount of nitrogen compounds that are not used by crops are mostly brought into groundwater and surface water by farmland drainage and surface runoff.

With the development of petroleum, chemical, food and pharmaceutical industries, and the continuous improvement of people's living standards, the content of ammonia nitrogen in urban domestic sewage and landfill leachate has risen sharply.

In recent years, with the economic development, more and more arbitrary discharge of nitrogen-containing pollutants has caused great harm to the environment.

Nitrogen exists in wastewater in various forms such as organic nitrogen, ammonia nitrogen (NH4 + -N), nitrate nitrogen (NO3--N) and nitrite nitrogen (NO2--N), and ammonia nitrogen is the most One of the main forms of existence.

Ammonia nitrogen in wastewater refers to nitrogen in the form of free ammonia and ionized ammonium, mainly derived from the decomposition of nitrogen-containing organic compounds in domestic sewage, industrial wastewater such as coking and synthetic ammonia, and farmland drainage. There are many sources of ammonia nitrogen pollution, large emissions, and large variations in the concentration of emissions.

The discharge of a large amount of ammonia nitrogen wastewater into the water body will not only cause eutrophication of the water body, cause the water body to be black and smelly, increase the difficulty and cost of water treatment, and even have a toxic effect on people and organisms.

The general formation of ammonia nitrogen wastewater is caused by the coexistence of ammonia water and inorganic ammonia. Generally, the main source of ammonia nitrogen in wastewater with a pH above neutral is the common action of inorganic ammonia and ammonia water. The pH of ammonia nitrogen in wastewater under acidic conditions Mainly due to inorganic ammonia.

There are two main types of ammonia nitrogen in wastewater, one is ammonia nitrogen formed from ammonia water, and the other is ammonia nitrogen formed from inorganic ammonia, mainly ammonium sulfate, ammonium chloride and so on.

The hazards of high ammonia nitrogen wastewater mainly include the following:
On the one hand, ammonia nitrogen in wastewater is an important substance for eutrophication and environmental pollution of water bodies, which is easy to cause algae and other microorganisms to multiply in the water. The operation of water treatment plants is difficult, resulting in odor in drinking water. In severe cases, the dissolved oxygen in the water will drop. Large numbers of deaths may even cause the lake to dry up and die.

On the other hand, ammonia nitrogen will also increase the amount of chlorine used in water supply disinfection and industrial circulating water sterilization treatment; it is corrosive to certain metals (copper); when sewage is reused, ammonia nitrogen in reclaimed water can promote water pipelines and water use The reproduction of microorganisms in the equipment forms biofouling, blocks pipes and water-using equipment, and affects heat exchange efficiency.

Secondly, ammonia is oxidized to nitrite and nitrate under the action of nitrifying bacteria. Nitrate induces methemoglobinemia in infants by drinking water, and the nitrosamines produced after nitrite saline hydrolysis are strongly carcinogenic and directly threaten Human health.

For the above introduction of Making Green Environmental Protection, you can contact us if you have any questions.
Making Green Environmental Protection Technology (Shanghai) Co., Ltd. is committed to bringing internationally advanced water, gas, solid waste treatment technology and operation management concepts to professional customers in the Chinese market, providing customers with mature, stable, cost-effective overall solutions. We have an expert team composed of domestic and foreign water treatment environmental engineers and well-known professors. We have several independent invention patents and biological treatment core technology process packages to provide nanny lists for customers' sewage treatment systems, exhaust gas systems and sludge solid waste treatment projects. service.