High salinity wastewater treatment method and treatment system

A technology for high-salt wastewater and a treatment method, applied in the field of water treatment, can solve the problems of increasing the operation and maintenance cost of the process system, decreasing the membrane flux of the separation membrane element, and scrapping the membrane separation element, so as to reduce the investment in fixed assets and the number of membrane modules. The effect of reducing and preventing scaling

Inactive Publication Date: 2018-10-09
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if this method is used to treat high-salt wastewater from power plants and coal chemical industries, slightly soluble inorganic salts (such as calcium sulfate, magnesium hydroxide, calcium carbonate, magnesium sulfate, etc.) will block the micropore channels of the membrane separation element, reducing the membrane flux of the separation membrane element. , and even make the membrane separation element scrapped and have to be replaced with a new separation memb

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  • High salinity wastewater treatment method and treatment system
  • High salinity wastewater treatment method and treatment system
  • High salinity wastewater treatment method and treatment system

Examples

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Example Embodiment

[0058] Example 1

[0059] Combine figure 1 This example is used to illustrate the high-salt wastewater treatment method of the present invention.

[0060] (1) Mix 20T / h, calcium sulfate supersaturation of 150% high-salt wastewater and step (3) obtained 6.67T / h, calcium sulfate supersaturation of 400% concentrated water as mixed feed water ( Calcium sulfate supersaturation is 212%) at a total flow rate of 26.67T / h for normal temperature crystallization treatment, of which the normal temperature crystallization treatment is 4% by weight sodium carbonate and 55ppm polyacrylamide (purchased from Nalco Company, the brand is 8103PLUS, the same below) is carried out to obtain calcium sulfate crystals (external discharge) and 26.67T / h, calcium sulfate supersaturation of 100% normal temperature crystallized water;

[0061] (2)Using an ultrafiltration membrane with a pore size of 6μm to perform ultrafiltration treatment of 26.67T / h, calcium sulfate supersaturation of 100% of normal temperatur...

Example Embodiment

[0063] Example 2

[0064] Combine figure 2 This example is used to illustrate the high-salt wastewater treatment method of the present invention.

[0065] (1) Mix 20T / h, calcium sulfate supersaturation of 150% high-salt wastewater and step (3) obtained 10T / h, calcium sulfate supersaturation of 300% concentrated water as mixed feed water (sulfuric acid Calcium supersaturation is 200%) at a total flow rate of 30T / h for normal temperature crystallization treatment, wherein the normal temperature crystallization treatment is carried out in the presence of 6 wt% calcium hydroxide and 65 ppm polyacrylamide to obtain calcium sulfate crystals (external discharge ) And 30T / h, 100% calcium sulfate supersaturation of normal temperature crystallization water;

[0066] (2)Using an ultrafiltration membrane with a pore size of 6μm to ultrafiltration treatment of 30T / h, calcium sulfate supersaturation of 100% of normal temperature crystallized water at 0.8MPa, to obtain 30T / h, calcium sulfate of 1...

Example Embodiment

[0068] Example 3

[0069] Combine image 3 This example is used to illustrate the high-salt wastewater treatment method of the present invention.

[0070] (1) Mix 20T / h, calcium sulfate supersaturation of 150% high-salt wastewater and step (3) obtained 20T / h, calcium sulfate supersaturation of 200% concentrated water as mixed feed water (sulfuric acid Calcium supersaturation is 175%) at a total flow rate of 40T / h for normal temperature crystallization treatment, wherein the normal temperature crystallization treatment is carried out in the presence of 7 wt% sodium hydroxide and 80 ppm polyacrylamide to obtain calcium sulfate crystals (external discharge ) And 40T / h, 100% calcium sulfate supersaturation of normal temperature crystallization water;

[0071] (2)Using an ultrafiltration membrane with a pore size of 6μm to ultrafiltration treatment of 40T / h, calcium sulfate supersaturation of 100% of normal temperature crystallized water under 0.6MPa, to obtain 40T / h, calcium sulfate of ...

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Abstract

The invention relates to the field of water treatment, and discloses a high salinity wastewater treatment method and treatment system. The method includes the following steps: (1) mixing high salinitywastewater and at least a part of concentrated water after membrane concentration treatment, and carrying out normal temperature crystallization treatment on the mixed intake water to obtain sparingly soluble salts and normal temperature crystallization exit water; (2) carrying out filtering treatment on at least a part of the normal temperature crystallization exit water to obtain filtered exitwater; and (3) carrying out membrane condensation treatment on the filtered exit water which is taken as membrane condensation intake water to obtain concentrated water and product water, and returning at least a part of the concentrated water to the normal temperature crystallization treatment. The method can fully reduce water quality requirement for an upstream high salinity wastewater pretreatment unit. The changes of the upstream high salinity wastewater pretreatment unit have wider applicability, and can effectively prevent fouling of a membrane separation element and greatly reduce thefixed assets investment of a whole process system.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a treatment method and system for high-salt wastewater. Background technique [0002] Most power plants and coal chemical plants in my country use limestone wet desulfurization technology to remove SO from flue gas. 2 , the desulfurization wastewater generated during operation has become one of the most difficult wastewater to treat in coal-fired power plants due to its complex composition and many types of pollutants. At present, the chemical precipitation method (commonly known as triple box precipitation) is mainly used in China to treat desulfurization wastewater. The treated water has a high salt content, and it is easy to cause secondary pollution after direct discharge. At the same time, due to the small amount of desulfurization wastewater and high salt content, the process system for further treatment of desulfurization wastewater in power plants and coal chemical plants ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/18
CPCC02F1/001C02F1/44C02F1/441C02F1/444C02F1/52C02F1/5245C02F1/56C02F5/08C02F9/00C02F2001/5218C02F2103/18
Inventor 李国涛钟振成熊日华程子洪陈权张微尘李小端霍卫东卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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