Treatment method and treatment system for salt-containing water

The technology of a water treatment system and treatment method is applied in the salt water treatment system and the treatment field of salt water, which can solve the problems of increasing the consumption of industrial sodium chloride and restricting the economy of the wastewater treatment process, so as to reduce the comprehensive treatment cost and realize the The effect of zero liquid discharge

Inactive Publication Date: 2017-04-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the regeneration frequency of ion exchange resin increases with the increase of divalent cation content in raw water, correspondingly, the consumption of industrial sodium chloride also increases, becoming one of the main components of user operating costs
In some applications with a large amount of water and high hardness, the regeneration cost of strong acid cation exchange resins has already overwhelmed users, which seriously limits the economics of the entire wastewater treatment process.

Method used

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  • Treatment method and treatment system for salt-containing water
  • Treatment method and treatment system for salt-containing water
  • Treatment method and treatment system for salt-containing water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] This example is used to illustrate the brine treatment method of the present invention.

[0133] (1) Supply the synthetic saline wastewater described in Table 1 to the lime softening and clarification unit for lime softening and clarification treatment, wherein the lime softening and clarification treatment method includes: adding 90 mg / L of hydrogen to the synthetic saline wastewater Calcium oxide and 694 mg / L sodium carbonate reacted for 30 minutes and then stood for clarification for 60 minutes to obtain lime-softened effluent and sludge, which were supplied to the desludge treatment unit for desludge treatment.

[0134] (2) Supply the lime softening effluent from the lime softening and clarification unit to the solid-liquid separation unit for solid-liquid separation, wherein the method for solid-liquid separation is: adjust the pH value of the lime softening effluent to 6.5 with hydrochloric acid, and then Use a security filter with a filtration precision of 5 μm t...

Embodiment 2

[0149] This example is used to illustrate the brine treatment method of the present invention.

[0150] (1) Supply the synthetic saline wastewater described in Table 2 to the lime softening and clarification unit for lime softening and clarification treatment, wherein the lime softening and clarification treatment method includes: adding 90 mg / L of hydrogen to the synthetic saline wastewater Calcium oxide and 694mg / L of sodium carbonate reacted for 30 minutes and then stood for clarification for 180 minutes to obtain lime-softened effluent and sludge. The sludge was supplied to the desludge treatment unit for desludge treatment.

[0151] (2) Supply the lime softened effluent from the lime softening and clarification unit to the strong acid cation exchange resin softening unit for softening treatment with strong acid cation exchange resin, wherein, the method of softening treatment with strong acid cation exchange resin includes: using strong acid styrene Cation exchange resin (N...

Embodiment 3

[0162] This example is used to illustrate the brine treatment method of the present invention.

[0163] (1) supply the synthetic saline waste water described in table 3 to the softening unit of strong acid cation exchange resin and carry out softening treatment with strong acid cation exchange resin, wherein, the method for softening treatment with strong acid cation exchange resin comprises: using strong acid styrene series cation Exchange resin (chemical plant of Nankai University, trade mark 001×7) is processed synthetic saline waste water, and the residence time of strong acid cation exchange resin treatment is 4 minutes, obtains the hardness of calcium carbonate meter and is the strong acid cation exchange softening of 22.5mg / L. out of water.

[0164] (2) Supply the strong acid cation exchange softening effluent from the strong acid cation exchange resin softening unit to the weak acid cation exchange resin softening unit and carry out softening treatment with weak acid c...

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Abstract

The invention relates to the field of water treatment and discloses a treatment method and a treatment system for salt-containing water. The treatment method comprises the steps of: (1) softening the salt-containing water with strong-acid cation-exchange resin to remove at least a part of bivalent cations and replace the bivalent cations by monovalent cations to produce strong-acid cation-exchange softened water; (2) performing reverse osmosis separation to the strong-acid cation-exchange softened water to concentrate the monovalent cation salt in the strong-acid cation-exchange softened water to obtain a reverse osmosis product water and reverse osmosis concentrated water being rich in monovalent cation salt; and (3) regenerating the strong-acid cation-exchange resin which is used for the treatment of the salt-containing water in the step (1) by means of a regenerating agent, wherein at least a part of the regenerating agent is prepared from the reverse osmosis concentrated water. The treatment method can achieve zero-liquid emission, and greatly reduces the comprehensive treatment cost of the salt-containing water.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a brine treatment method and a brine treatment system. Background technique [0002] With the continuous improvement of environmental protection requirements, contradictions such as insufficient water resources and limited environmental capacity have become increasingly prominent. In petrochemical, coal chemical, electric power, steel, seawater desalination and other production processes, a large amount of saline wastewater will be produced. It is of great practical significance to treat these saline wastewater and realize the recycling of wastewater. [0003] In order to reduce the amount of external drainage and improve the efficiency of water use, currently salty wastewater is generally treated by reverse osmosis-based membrane method and then recycled. Although the water use efficiency has been improved to a certain extent, it cannot achieve zero liquid discharge. In some occa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/06C02F9/10
Inventor 熊日华宋岩霍卫东左书全赵剑
Owner CHNA ENERGY INVESTMENT CORP LTD
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