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Device and method for removing ammonia nitrogen, nitrite nitrogen and COD in marine culture wastewater

A marine aquaculture and nitrous nitrogen technology is applied in the field of devices for removing ammonia nitrogen, nitrite nitrogen and COD from marine aquaculture wastewater, and can solve problems such as the inability of the biological method to be lasting and stable, the poor resistance to adverse environmental impact, and the regeneration of adsorbents. , to achieve good development prospects, easy operation and maintenance, fast removal rate

Inactive Publication Date: 2016-04-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages in the treatment of aquaculture wastewater, but there are also certain problems. For example, the biological method can not last for a long time, and its ability to resist adverse environmental impact is poor. Most of the chemical methods need to add additional chemical reagents. Membrane treatment has problems such as high cost, generation of concentrated water, and membrane fouling. Ion exchange and adsorption methods face the problem of adsorbent regeneration

Method used

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  • Device and method for removing ammonia nitrogen, nitrite nitrogen and COD in marine culture wastewater
  • Device and method for removing ammonia nitrogen, nitrite nitrogen and COD in marine culture wastewater
  • Device and method for removing ammonia nitrogen, nitrite nitrogen and COD in marine culture wastewater

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Effect test

Embodiment 1

[0041] combine figure 1 and figure 2 Shown, the method for electrochemically removing ammonia nitrogen, nitrite nitrogen and COD in mariculture wastewater is carried out in the following steps:

[0042] 1. The wastewater discharged from the mariculture wastewater is collected and enters the reservoir 1;

[0043] 2. The outlet water of the reservoir 1 enters the electrochemical reactor 3 equipped with the anode 5, the bipolar electrode 7 and the cathode 6 through the peristaltic pump 2, starts the DC stabilized power supply 4, and enters the water from the bottom to the top. The parallel placement of the electrodes can ensure sufficient and uniform contact between the electrodes and the aqueous solution;

[0044] 3. In the electrochemical reactor 3, a large amount of Cl in the aqueous solution - Oxidized to Cl at the anode 2 , the generated Cl 2 Dissolved into aqueous solution to generate HOCl, wherein HClO is also ionized to generate ClO - . Free chlorine (including Cl...

Embodiment 2

[0052] Compared with Example 1, the treatment method is only different in that the current density is 4mA / cm 2 .

[0053] After testing, the concentrations of ammonia nitrogen, nitrite nitrogen and COD before and after treatment are shown in Table 2.

[0054] Table 2: Concentrations of typical ammonia nitrogen, nitrite nitrogen and COD before and after treatment (mg / L)

[0055]

Embodiment 3

[0057] Compared with Example 1, the treatment method differs only in that the initial concentrations of ammonia nitrogen, nitrite nitrogen and COD are different.

[0058] After testing, the concentrations of ammonia nitrogen, nitrite nitrogen and COD before and after treatment are shown in Table 3.

[0059] Table 3: Concentrations of typical ammonia nitrogen, nitrite nitrogen and COD before and after treatment (mg / L)

[0060]

[0061]

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Abstract

The invention discloses a device and method for removing ammonia nitrogen, nitrite nitrogen and COD in marine culture wastewater. A water inlet is formed in the top end of an impounding reservoir of the device and communicated with a water outlet in the upper end of an electrochemical reactor, and a water outlet is formed in the lower end of the impounding reservoir and connected with a water inlet in the lower end of the electrochemical reactor. An anode, a bipolar electrode and a cathode are sequentially arranged in the electrochemical reactor through a peristaltic pump, the anode is connected with a positive electrode of a direct-current stabilized power supply, and the cathode is connected with a negative electrode of the direct-current stabilized power supply. A chemical agent does not need to be added, and thus treatment cost can be greatly reduced; free chlorine is constantly generated in situ at the anode, and thus safety performance is improved; the treatment process is clean and quick, and sludge and secondary pollution are avoided; the ammonia nitrogen, nitrite nitrogen and COD removing speed is high, and efficiency is high; only the current size needs to be controlled, and thus control is easy; the device is simple and convenient to operate and maintain.

Description

technical field [0001] The invention relates to a water treatment device and method, in particular to a device and method for removing ammonia nitrogen, nitrite nitrogen and COD from seawater aquaculture wastewater. Background technique [0002] The aquaculture industry has developed rapidly in recent years. The discharge of a large amount of aquaculture wastewater has caused a huge impact on the surrounding environment, the deterioration of the water environment, frequent red tides, and the destruction of ecological balance and biodiversity. The decline in water quality in aquaculture waters has also brought huge losses to my country's fishery economy. Ammonia nitrogen, nitrite nitrogen and COD are the main pollutants in aquaculture wastewater, and they are also the most difficult to remove. At present, there are relatively few technologies specifically aimed at aquaculture wastewater, and most of them refer to the traditional sewage treatment methods. For seawater syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/72C02F101/16C02F103/08
CPCC02F1/4672C02F1/72C02F2101/16C02F2103/08
Inventor 郭希山郭迪
Owner ZHEJIANG UNIV
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