Nitrification-denitrification circulating water treatment method

Abstract

The invention discloses a nitrification-denitrification circulating water treatment method. The method comprises the following steps: to-be-treated water flows through a denitrification cavity regulated to be an anoxic condition; the to-be-treated water flows through a nitrification cavity regulated to be an aerobic environment; the to-be-treated water flows through a sedimentation cavity to realize solid-liquid separation; the to-be-treated water flows through a regulation cavity to realize regulation of pH; the to-be-treated water is disinfected. The method has the benefits as follows: waterflows through the denitrification cavity under the anoxic condition, the nitrate nitrogen level can be reduced, and poison of nitrate nitrogen to cultured organisms can be reduced; water flows through the nitrification cavity under the aerobic condition, and the high-biotoxicity ammonia nitrogen and nitrite nitrogen levels in aquaculture emission can be reduced; water is subjected to solid-liquidseparation, so that turbidity can be reduced; water is subjected to pH regulation and pH can be improved; water is disinfected, thus, poison of pathogenic microorganisms to cultured organisms can bereduced. The invention relates to a water treatment method.

Description

Technical field [0001] The invention relates to a water treatment method, in particular to a nitrification and denitrification circulating water treatment method. Background technique [0002] With the development of aquaculture from the traditional extensive flowing water aquaculture model to a high-density and intensive aquaculture model, the scale and output of aquaculture are increasing day by day, and the subsequent problems of non-point source pollution and the increase of breeding diseases have become increasingly serious. [0003] The traditional circulating water aquaculture water treatment system uses mechanical filtration, air flotation and other physical methods to remove residual bait and feces and other particulate matter, and uses the metabolism of microorganisms to convert highly biologically toxic ammonia nitrogen, nitrite nitrogen and other soluble inorganic nitrogen into low Biological toxicity of nitrate nitrogen. The technical shortcomings of the traditional c...

AI Technical Summary

Problems solved by technology

The technical defects of the traditional circulating aquaculture water treatment system are: the lack of carbon source, the low denitrification efficiency of the system, the continuous accumulation of nitrate nitrogen in the system, and the high concentration of nitrate nitrogen may have a toxic effect on the cultured organisms

[0004] The water treatment system that uses regular external carbon sources to strengthen denitrification and denitrification has a technical defect: the demand for carbon sources is large, resulting in a significant increase in water treatment costs

In order to ensure the economic benefits of aquaculture, it is often necessary to change the water to solve the problem of nitrate nitrogen accumulation in the end, and it is difficult to realize the real recycling of aquaculture water

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