Reverse-osmosis seawater desalination pretreatment method and device for polluted sea areas

A technology of pretreatment and membrane placement, which is applied in the field of water treatment to achieve the effects of ensuring stability, preventing broken wires, and reducing investment and operating costs

Inactive Publication Date: 2013-05-29
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And on this basis, aiming at the problems in the field of seawater desalination pretreatment in polluted sea areas, provide a seawater desalination pretreatment me

Method used

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  • Reverse-osmosis seawater desalination pretreatment method and device for polluted sea areas
  • Reverse-osmosis seawater desalination pretreatment method and device for polluted sea areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This test uses seawater a in a sea area, and the water quality is shown in Table 1.

[0032] Table 1 Raw water quality table

[0033] indicators

[0034] It can be seen from Table 1 that the raw water quality belongs to Class III water body, and the water body is polluted, and there are many particulate matter in it. The operating process of the system is pre-sedimentation-potassium ferrate oxidation-on-line coagulation-submerged ultrafiltration, in which the submerged ultrafiltration membrane is a hollow fiber ultrafiltration membrane, the membrane material is polyvinylidene fluoride, and the membrane pore size is 0.01 micron. The dosage of potassium ferrate is 1mg / L, and the dosage of coagulant ferric chloride is 2mg / L (calculated as iron). For the submerged membrane tank with tapered groove, in the cross-sectional height of the tank body, the height ratio of the sedimentation tank, the solid-liquid separation area and the membrane installation area is: 4:1...

Embodiment 2

[0036]This test uses seawater b in a sea area, and the water quality is shown in Table 2.

[0037] Table 2 Raw water quality table

[0038] indicators

[0039] It can be seen from Table 2 that the raw water quality belongs to Class III water body, and the water body is polluted. The operating process of the system is pre-sedimentation-potassium permanganate oxidation-on-line coagulation-submerged ultrafiltration, in which the submerged ultrafiltration membrane is a hollow fiber ultrafiltration membrane, the membrane material is polyvinylidene fluoride, and the membrane pore size is 0.01 micron. The dosage of potassium permanganate is 1mg / L, and the dosage of coagulant ferric chloride is 1mg / L (calculated as iron). For the submerged membrane pool with tapered groove, the height ratio of the sedimentation tank, the solid-liquid separation area and the membrane area is 5:1:1.1 in the cross-sectional height of the pool body. The operating conditions of the membrane are...

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Abstract

The invention relates to reverse-osmosis seawater desalination pretreatment method and device for polluted sea areas. The technical scheme of the reverse-osmosis seawater desalination pretreatment device includes that a silt precipitation tank with conical section is arranged on the lower portion of a common micro- and ultra-filtration membrane tank body, a solid and liquid separation area is arranged in the middle of the common micro- and ultra-filtration membrane tank, and water is fed from the solid and liquid separation area. By the aid of the structure of the reverse-osmosis desalination pretreatment device, recovery rate of the system can be effectively increased, disturbance on membrane component from water impact is avoided, stability of outlet water quality is guaranteed, energy is saved and consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a reverse osmosis seawater desalination pretreatment method and device for polluted sea areas. Background technique [0002] In the 21st century, human beings are facing a serious shortage of fresh water. The lack of water resources has become a major issue related to poverty, sustainable development and even world peace and security. Therefore, seawater desalination is getting more and more attention. Seawater desalination technology is used to produce water from seawater. Clean water has become an important means for people to obtain fresh water. [0003] At present, the main seawater desalination methods used in the world include multi-stage flash evaporation (MSF), multi-effect evaporation (MED), and reverse osmosis (RO). RO technology has low investment, convenient operation, short construction period, and land occupation. Seawater reverse osmosis (SWRO)...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/44C02F1/72C02F103/08
CPCY02A20/131
Inventor 王丽华杨瑜芳
Owner TORAY FIBER RES INST(CHINA) CO LTD
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