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Efficient desulfurized seawater quality restoration method and system

A technology for desulfurizing seawater and restoring water quality, which is applied in seawater treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., and can solve the problems of high energy consumption and large footprint of the aeration process

Inactive Publication Date: 2015-12-23
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to overcome the disadvantages of high energy consumption and large footprint of the traditional aeration process, while preventing SO 2 overflow, proposed an efficient desulfurization seawater quality restoration method and system

Method used

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  • Efficient desulfurized seawater quality restoration method and system
  • Efficient desulfurized seawater quality restoration method and system

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Effect test

Embodiment 1

[0035] Desulfurization seawater flow rate is 20000m 3 / h, using traditional technology, the ratio of air to sea water is 2:1, the hydraulic retention time in the aeration tank is 400s, and the area of ​​the aeration tank is about 2000m 2 and adopt the method and system of the present invention, the molar mass ratio of S (Ⅳ) in ozone and seawater is 2:1, the air and seawater air-water ratio is 5:1, and the hydraulic retention time in the aeration tank is 200s, and the aeration tank accounts for The land is about 1000m2.

Embodiment 2

[0037] Desulfurization seawater flow rate is 20000m 3 / h, using traditional technology, the ratio of air to sea water is 2:1, the hydraulic retention time in the aeration tank is 400s, and the area of ​​the aeration tank is about 2000m 2 and adopt the method and system of the present invention, the molar mass ratio of S (Ⅳ) in ozone and seawater is 5:1, the air and seawater air-water ratio is 10:1, and the hydraulic retention time in the aeration tank is 150s, and the aeration tank accounts for The land is about 800m2.

Embodiment 3

[0039] Desulfurization seawater flow rate is 20000m 3 / h, using traditional technology, the ratio of air to sea water is 2:1, the hydraulic retention time in the aeration tank is 400s, and the area of ​​the aeration tank is about 2000m 2 and adopt the method and system of the present invention, the molar mass ratio of S (Ⅳ) in ozone and seawater is 8:1, the air and seawater air-water ratio is 15:1, and the hydraulic retention time in the aeration tank is 100s, and the aeration tank accounts for The land is about 500m2.

[0040] In addition, an ozone aerator backwashing system is also set up in the present invention. Since the ozone consumption is relatively small and the aeration intensity is low, the aerator may be blocked after long-term operation. In the present invention, the valve can be used to switch , realize the purging and cleaning process of the ozone aerator with high-pressure air, and avoid setting up additional cleaning equipment. After running for a period of ...

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Abstract

The invention puts forward an efficient desulfurized seawater quality restoration method, which includes the steps of: subjecting desulfurized seawater to ozone aeration treatment to oxidize SO3<2-> in the desulfurized seawater into stable SO4<2->; conducting air aeration treatment on the desulfurized seawater to expel CO2 in the seawater to restore the pH value of the desulfurized seawater to more than 6.8. The invention also puts forward an efficient desulfurized seawater quality restoration system, which includes an ozone aeration zone for rapidly oxidizing SO3<2-> in the desulfurized seawater into stable SO4<2->; and an air aeration zone for expelling CO2 in the seawater so as to restore the pH value of the desulfurized seawater to more than 6.8. Compared with the traditional process, the method and the system provided by the invention can rapidly oxidize SO3<2-> into SO4<2-> under low pH, greatly shorten the time needed for oxidizing SO3<2-> into SO4<2->, also can effectively reduce the blending amount of seawater in a regulation pool, and are in favor of reducing the hydraulic retention time in an aeration pool and saving aeration pool land occupation.

Description

technical field [0001] The invention relates to the field of environmental water treatment; in particular, it relates to a method and system for restoring the quality of desulfurized seawater with high efficiency in a seawater desulfurization system. Background technique [0002] As an energy source with mature technology and reliable operation, coal-fired power generation has long occupied a dominant position in my country's energy structure. In addition to coal-fired power plants, there are also a large number of industrial coal-fired boilers and marine power coal-fired boilers. When coal-fired boilers are in operation, they will produce a large amount of SO 2 flue gas, in order to prevent SO in the flue gas 2 If the environment is polluted, corresponding measures must be taken. Among them, the seawater desulfurization process does not need additional consumption of fresh water and absorbent, no by-products and waste, simple process, convenient maintenance, saving invest...

Claims

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Application Information

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IPC IPC(8): C02F1/78C02F103/08C02F101/10
Inventor 刘海洋江澄宇谷小兵
Owner DATANG ENVIRONMENT IND GRP
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