A method for simultaneous removal of ammonia nitrogen and nitrate nitrogen in water bodies

Abstract

A method for simultaneously removing ammonia nitrogen and nitrate nitrogen from a water body is disclosed. The method includes subjecting the water body containing ammonia nitrogen and nitrate nitrogen to oxidation-reduction treatment by adopting an iron catalyst under functions of anaerobic ammoxidation microbes, iron autotrophic denitrification microbes and iron-reduction ammoxidation microbes.The iron catalyst includes one or a plurality of elementary iron, a ferrous compound and a ferric compound. The catalytic treatment is performed in an anaerobic environment. The anaerobic ammoxidationmicrobes, iron autotrophic denitrification microbes and iron-reduction ammoxidation microbes provide reaction functional microbes for anaerobic ammoxidation, iron autotrophic denitrification and iron-reduction ammoxidation, allow oxidation-reduction treatment of the ammonia nitrogen and nitrate nitrogen to be performed stably and continuously under the premise of not continuously adding the catalyst, and can completely convert the ammonia nitrogen and nitrate nitrogen into nitrogen without a byproduct. The method is free of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for synchronously removing ammonia nitrogen and nitrate nitrogen in water bodies. Background technique [0002] Ammonia nitrogen in water bodies will cause eutrophication of lakes and rivers, and cause harm to the natural ecological environment of water bodies and aquaculture. At the same time, ammonia nitrogen can also corrode and block pipes and water equipment. High concentrations of ammonia nitrogen can react with chlorine, a water treatment disinfectant, which greatly increases the amount of water disinfectant and produces a disgusting smell. Nitrate nitrogen will affect the water quality safety, cause serious harm to human health, easily induce methemoglobinemia and produce carcinogenic nitrosamines. There is an urgent need for a method that can simultaneously remove ammonia nitrogen and nitrate nitrogen in water. [0003] Biological d...

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Problems solved by technology

However, this process requires a large amount of power consumption (oxygen supply for nitrification) and the addition of chemicals (organic matter for denitrification)

In addition, the denitrification process also has the following disadvantages: (1) It is necessary to add a large amount of acid and alkali solution to keep the pH stable; (2) The amount of sludge generated during the denitrification process is relatively high; (3) It is difficult to accurately dosing, The organic matter is completely removed during the denitrification process, and new pollutants will be produced

However, there are also some problems in the autotrophic denitrification process, for example: (1) the use of elemental sulfur (sulfide) in the autotrophic denitrification process produces sulfate in the denitrification process due to the addition of electron acceptors, resulting in new sulfur dioxide in the water body. Pollutants; (2) During the autotrophic denitrification process of zero-valent iron (ferrous iron), electron acceptors are finally converted into ferric iron, and the compound (ferric hydroxide) formed by ferric iron has a good flocculation effect, Wrapped on the surface of granular sludge, with the continuous addition of iron ions, the final sludge will be mineralized and the denitrification efficiency will decrease

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