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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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 fish and shrimp breeding process. In this case, the denitrification effect of anaerobic denitrification bacteria will be greatly reduced, or even not work at all.
In practical application, it can only play an auxiliary role, and cannot be widely promoted.
It can be seen from the above that there are more or less insurmountable problems in the existing aquaculture water denitrification technology

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
Comparison scheme
Effect test

Embodiment 1～3

[0022] Simulated aquaculture water experiment:

[0023] A water tank was used to simulate aquaculture water, and 20 goldfish were added to it to form a small water environment, and an air pump was used to ventilate it to form an aerobic environment. The indicators of the simulated water bodies in each water tank are as follows: the initial nitrite nitrogen concentration of the experimental group 1, 2, 3, and the control group were 0.24mg / l, 0.18mg / l, 0.27mg / l, 0.32mg / l; Keep consistent at about 5.0mg / l; water temperature is room temperature. At a room temperature of 25°C, add bacillus (Bacillus lishengpingan bacillus produced by Zhongshan Baihao Biological Engineering Co., Ltd.) to the water tank at a concentration of 10 9 Bacteria / ml, continuous ventilation to maintain the dissolved oxygen in the water tank at about 5.0mg / l. Set up three experimental groups, and make a control group without adding bacteria solution at the same time. The specific experimental conditions are...

Embodiment 4

[0026] Real water experiment:

[0027] Bacillus (Bacillus Lishengpingan bacillus produced by Zhongshan Baihao Biological Engineering Co., Ltd.) was tested according to the following experimental conditions: the bacterial solution with a cell concentration of 108 bacteria / ml was added in an amount of 10 kg per mu, and every The spraying was carried out again for three days; the nitrite nitrogen concentration was measured every other day during the experiment. The indicators of the real water body are: the initial concentration of nitrite nitrogen in the experimental group is 0.83mg / l, the pH of the water body is 7.67, the initial concentration of nitrite nitrogen in the control group is 0.75mg / l, and the pH of the water body is 7.25. Use an aerator to maintain a certain amount of dissolved oxygen, and keep the dissolved oxygen at about 4mg / l; the water temperature is about 20°C. One of the ponds did not add bacterial solution as a control, and the rest of the external conditio...

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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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