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Oxygenating method for breeding aquatic creature or temporary breeding water body

A technology for aquatic organisms and water bodies, which is applied in sustainable biological treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. The effect of low and high dissolved oxygen concentration

Inactive Publication Date: 2009-09-02
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the oxygenation methods used for aquatic organism breeding water or temporary water body are to mix oxygen and water body through high-speed moving mechanical parts to achieve the purpose of oxygenation, such as various aerators, and some are through air distribution. Oxygenation of components such as stones, these oxygenation methods have low oxygenation efficiency and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A temporary water tank with 1 cubic meter of seawater is used to temporarily raise 20 large yellow croakers produced in cage culture. A 30-centimeter-long hollow fiber membrane module made of polypropylene is used. The pore size of the pores is 0.22 microns. The oxygen-containing gas with a pressure of 1.25-1.35 atm (absolute pressure) is introduced into the tube side of the hollow fiber membrane module (that is, the inner side of the hollow fiber membrane), and the water to be oxygenated in the water tank is sea water, and a centrifugal pump is used to pump After the oxygenated water is filtered by the filter cloth, it is passed into the shell side of the hollow fiber membrane module (that is, the outside of the hollow fiber membrane) at a flow rate of 1.5m / s, and the water flowing out of the shell side is the oxygenated water body. When returning to the water tank, the circulation flow of the water body is 400-600 liters / hour. During the experiment, artificially prepa...

Embodiment 2

[0019] A temporary water tank with 1 cubic meter of fresh water is used to temporarily raise 17 flat fish and 20 crucian carp. A hollow fiber membrane module made of polyvinylidene fluoride with a length of 30 cm is used. The pore size of the pores is 0.4 microns. The tube side of the fiber membrane module is fed with oxygen-containing gas with a pressure of 1.2-1.3 atm (absolute pressure). The water to be oxygenated in the water tank is fresh water. The flow rate is 1.4m / s into the shell side of the hollow fiber membrane module, and the water flowing out from the shell side is the oxygenated water body, which returns to the water tank, and the circulation flow rate of the water body is 350-550 liters / hour. During the experiment, 20% to 30% of the water volume was replaced with tap water every day. The test was carried out for 16 days, and the dissolved oxygen in the water remained in the range of 4.6-7.2 mg / L, and the flat fish and crucian carp lived in good condition.

Embodiment 3

[0021] A 0.5 cubic meter hexahedral aquarium, except for the top of the aquarium, the other five sides are arranged with a flat-plate membrane module fixed with a polytetrafluoroethylene flat-plate microporous membrane, and the diameter of the micropores is 0.45 microns. The inner air path is connected with an oxygen-containing gas pipeline and connected to an oxygen source of 1.1atm (absolute pressure). The outer side of the flat membrane module is protected by a nylon net and is in contact with the water in the aquarium. 10 to 15 tropical fish are cultivated in the aquarium. The dissolved oxygen in the water body can be maintained in the range of 5.3-8.1 mg / L, and the water body in the aquarium is regularly replaced by 5-10% from the bottom. A total of 278 days of fish farming, tropical fish survival in the aquarium is good.

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Abstract

An oxygen aerating method for the water in which the aquatic living things are cultured features use of millipore membrane, that is, the compressed oxygen gas is at one side of millipore membrane and the flowing water at its another side. The O2 aeration can be controlled by regulating the pressure of O2 and the flow speed of water.

Description

technical field [0001] The invention relates to a method for oxygenating a water body, in particular to an oxygenating method for aquaculture or temporarily raising a water body. Background technique [0002] In aquaculture, temporary storage tanks for aquatic organisms, long-distance transportation of aquatic organisms, and ornamental aquariums, it is necessary to continuously oxygenate the water body to provide a suitable living environment for aquatic organisms in the water body, so as to keep aquatic organisms alive for a long time state. At present, most of the oxygenation methods used for aquatic organism breeding water or temporary water body are to mix oxygen and water body through high-speed moving mechanical parts to achieve the purpose of oxygenation, such as various aerators, and some are through air distribution. Oxygenation can be achieved by components such as stones. These oxygenation methods have low oxygenation efficiency and high energy consumption. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K61/00A01K63/04C02F7/00
CPCY02A40/81Y02W10/10
Inventor 陆茵
Owner NINGBO UNIV
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