Method for removing aquaculture water nitrite nitrogen by aerobic denitrification

A technology for aerobic denitrification and aquaculture water, applied in chemical instruments and methods, aerobic process treatment, biological water/sewage treatment, etc. Restrict further application and other issues, and achieve the effects of wide range of physical and chemical indicators, rapid growth, and wide range of use

Inactive Publication Date: 2009-01-21
SOUTH CHINA UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

While the end product nitrate is relatively less toxic to farmed organisms, it disrupts the nitrogen balance of the biosphere
From the perspective of environmental protection, its further application is limited.
However, when using denitrification to remove nitrogen under anaerobic conditions, another problem will be encountered.
That is, sufficient dissolved oxygen must be ensured during the f

Method used

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  • Method for removing aquaculture water nitrite nitrogen by aerobic denitrification
  • Method for removing aquaculture water nitrite nitrogen by aerobic denitrification
  • Method for removing aquaculture water nitrite nitrogen by aerobic denitrification

Examples

Experimental program
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Example

[0021] Examples 1~3

[0022] Simulated aquaculture water experiment:

[0023] The water tank simulates the aquaculture water body, adding 20 goldfish to it, forming a small water body environment, and ventilating it with an air pump to form an aerobic environment. The various indicators of the simulated water body of each water tank are as follows: the initial nitrous nitrogen concentration of experimental group 1, 2, 3 and control group are 0.24mg / l, 0.18mg / l, 0.27mg / l, 0.32mg / l; The consistency is about 5.0mg / l; the water temperature is room temperature. At room temperature 25°C, add Bacillus (Bacillus lividans produced by Zhongshan Baihao Biological Engineering Co., Ltd.) into the water tank at a concentration of 10 9 A bacteria / ml, continuous ventilation keeps the dissolved oxygen in the water tank at about 5.0mg / l. Set up three experimental groups, and at the same time make a control group without bacterial liquid. The specific experimental conditions are as follows: add 2ml ...

Example Embodiment

[0025] Example 4

[0026] Real water experiment:

[0027] Bacillus (Zhongshan Baihao Bioengineering Co., Ltd. produced Bacillus licheniformis) was tested according to the following experimental conditions: the bacterial solution with a bacterial cell concentration of 108 bacteria / ml was dosed in an amount of 10 kg per mu, Doses again for three days; during the experiment, the concentration of nitrous nitrogen was measured every other day. The various indicators of the real water body are: the initial nitrous nitrogen concentration of the experimental group is 0.83mg / l, the water pH is 7.67, the initial nitrous nitrogen concentration of the control group is 0.75mg / l, and the water pH is 7.25. Use an aerator to maintain a certain amount of dissolved oxygen, and maintain its dissolved oxygen at about 4mg / l; the water temperature is about 20℃. One of the ponds did not add bacteria liquid as a control, and the other external conditions were basically similar. The changes in the concent...

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Abstract

The invention discloses a method for removing nitrite nitrogen from aquaculture water through aerobic denitrification. The method comprises the following steps that bacillus liquid is fed into aquaculture water; the concentration of the bacillus liquid is 10 <8>to 10<10> bacteria/ml, and the dose per mu of the bacillus liquid is no less than 10kg; moreover, the oxygen dissolution capacity of the aquaculture water is between 2 and 10mg/L; and the temperature is controlled between 13 and 42 DEG C, and the pH is controlled between 5.0 and 9.0. The method has the advantages that the method takes bacillus which still has strong denitrification capability under aerobic condition as original strain; only 10kg of the bacillus liquid needs to be fed into every mu of aquaculture water, and the removal rate of the nitrite nitrogen can reach 92.7 percent after 5 days; the final product after the nitrite nitrogen is removed is N2, and no N2O which can cause environmental pollution is generated; meanwhile, the method has the advantages of simple operation and low cost, and can obtain ideal effects in smaller dose; moreover, the bacillus liquid can also promote the growth of cultured organism, and has double efficacies; therefore, the bacillus liquid is worthy of popularization and application in aquiculture.

Description

technical field [0001] The invention relates to a method for removing nitrite nitrogen from aquaculture water by bacillus, in particular to a method for removing nitrite nitrogen from aquaculture water through denitrification under aerobic conditions. Background technique [0002] The removal of nitrogen in aquaculture water is a very important link, and biological nitrification and denitrification are the most economical and environmentally friendly processes in the process of nitrogen removal. It is now generally accepted that nitrification and denitrification processes are carried out under aerobic and anoxic environments, respectively. However, denitrification under aerobic conditions has been reported continuously, and some aerobic denitrifying bacteria have been screened out. These bacteria mainly exist in the genus Pseudomonas, Alcaligenes, Paracoccus and Bacillus, and are a type of aerobic or facultative aerobic, Organic carbon as an energy source for heterotrophic...

Claims

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Application Information

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IPC IPC(8): C02F3/02C02F3/34
CPCY02W10/10
Inventor 林炜铁李兵梁锏文昝继清
Owner SOUTH CHINA UNIV OF TECH
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