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Water purification and aeration method and equipment for closed recirculating aquaculture system

A water purification, closed cycle technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. Pressure increase and other problems, to achieve the effect of increasing oxygen mass transfer efficiency, prolonging gas-liquid contact time, and reducing oxygen waste

Active Publication Date: 2017-05-24
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this utility model is that the liquid oxygen and ozone generators used have high energy consumption and poor economy
Moreover, the gas inhalation device, gas-water mixing pump and other devices used have low oxygen mass transfer efficiency, and the operation is complicated, making it difficult to efficiently increase oxygen.
[0010] The Chinese utility model patent with the authorized announcement number CN 2465469Y uses polypropylene membrane modules to evenly mix oxygen into water, and compressed air penetrates from the inner side of the membrane filaments to the outer water body, and the gas and liquid are mixed in a cross-flow manner. Polypropylene is hydrophobic However, when the membrane pores are continuously wetted, the permeation pressure of the gas increases, so the stability of the system cannot be guaranteed
[0011] In addition, the existing technology can only achieve a single aeration or filtration operation. When applied to a recirculating aquaculture system, there are disadvantages such as large space occupation, difficult operation and management, and high cost.

Method used

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  • Water purification and aeration method and equipment for closed recirculating aquaculture system
  • Water purification and aeration method and equipment for closed recirculating aquaculture system
  • Water purification and aeration method and equipment for closed recirculating aquaculture system

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Such as figure 1 and image 3 As shown, the hollow fiber membrane module has a diameter of 2 inches, a length of 600mm, and a membrane filtration area of ​​1.2 m 2 . The membrane filament is made of polymer material PVDF by diffusion-induced phase inversion method, which has good filtration performance and mechanical strength. The inner diameter of a single membrane filament is 0.7mm, the outer diameter is 1.3mm, the most probable pore diameter is 25±2nm, accounting for more than 80%, and the largest pore is less than 50nm. The membrane with this pore size can better distribute oxygen and improve the efficiency of oxygen mass transfer.

[0062] During the oxygenation process, the hollow fiber membrane module 5 adopts an external pressure dead-end operation mode to improve the utilization rate of oxygen. Under the action of the pump, the water enters the shell layer of the membrane module through the water inlet, and penetrates into the inside of the membrane filamen...

Embodiment 2

[0067] Such as figure 1 and image 3 As shown in the device, the hollow fiber membrane module 5 has a diameter of 2 inches, a length of 600 mm, and a membrane filtration area of ​​1.2 m 2. The membrane filament is made of polymer material PVDF by diffusion-induced phase inversion method, which has good filtration performance and mechanical strength. The inner diameter of a single membrane filament is 0.7mm, the outer diameter is 1.3mm, the most probable pore diameter is 25±2nm, accounting for more than 80%, and the largest pore is less than 50nm. The membrane with this pore size can completely intercept solid pollutants and some macromolecular impurities in water.

[0068] During the filtration process, the water body enters the shell layer of the membrane module through the water inlet under the action of the pump, and the entering pressure is about 0.05MPa. Filtration of water bodies. The filtered water is discharged from the water outlet and enters the pool 7 again. T...

Embodiment 3

[0073] Such as figure 1 and image 3 In the device shown, clean water is used as the water source, and the device is composed as follows: oxygen source 1, gas regulating valve 2 and barometer 3 are connected by steel pipes; after passing through the gas flow meter 4, rubber hoses are used to connect the subsequent hollow fiber membrane module 5 . The transfer pump 6 (centrifugal pump) is connected to the pool through plastic water pipes; the hollow fiber membrane module 5 is connected to the pool 7 through rubber tubes, and water circulation is realized under the action of the pump. In addition, it is equipped with a dissolved oxygen detector 8 to detect the effect of increasing oxygen.

[0074] The working process is divided into two parts: water and air. Oxygen gas starts from the oxygen source 1, is controlled by the gas regulating valve 2, flows from the steel pipe through the barometer 3, and flows into the membrane module through the hose after being regulated by the ...

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Abstract

The invention relates to a water purification and aeration method and equipment for a closed recirculating aquaculture system, in particular to a method and equipment for realizing double-effect functions of water purification and aeration with an organic hollow fiber microporous membrane material as a core component. Filtration of suspended solids and organic macromolecular impurities is combined on the basis of water aeration by use of a membrane technology. Multiple steps of operation in recirculating aquaculture is integrated in a single system, the equipment occupied space is effectively reduced, and the pipeline connection is simplified; management of the whole recirculating aquaculture system is facilitated, and the operation efficiency is improved.

Description

technical field [0001] The invention relates to a method and equipment for increasing pure oxygen in a closed circulating aquaculture system, in particular to a method and equipment for realizing the double-effect functions of water purification and oxygen enhancement with an organic hollow fiber microporous membrane material as the core component. Background technique [0002] In recent years, with the advancement of material science, membrane technology has made great progress. People have successively developed membrane modules to meet different needs, and they have been widely used in the fields of chemical industry, water treatment and medicine. [0003] Closed recirculating aquaculture is a new aquaculture method produced by the intersection of multiple disciplines. Its technological process can generally be summarized as follows: the aquaculture water first flows out, is mechanically filtered to remove solid suspended matter, enters the protein separator, and then en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F7/00C02F1/44C02F103/20
CPCC02F1/444C02F7/00C02F2103/20Y02W10/10
Inventor 崔朝亮汪朝晖周冠宇丁宁汪效祖邢卫红徐南平
Owner NANJING UNIV OF TECH
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