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Combined treatment method for regenerated high-concentration salt wastewater of sodium ion exchanger

A sodium ion exchanger and combined treatment technology, which is applied in the field of combined treatment of high-concentration salt wastewater regenerated by sodium ion exchangers, can solve the problems of high price, high energy consumption, and unfavorable promotion and use.

Active Publication Date: 2021-07-13
北京拓凯化工技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Most of the ion-exchange resin regenerated high-concentration salt wastewater methods proposed in the above documents use chemical methods to precipitate calcium ions and magnesium ions. The cost of wastewater treatment is not conducive to large-scale promotion and use

Method used

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  • Combined treatment method for regenerated high-concentration salt wastewater of sodium ion exchanger

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Effect test

Embodiment 1

[0031] A steel company uses a sodium ion exchanger to prepare softened water. After the resin of the sodium ion exchanger is saturated, it uses 6% sodium chloride solution to regenerate the resin. Through the control of the wastewater discharge valve and discharge pipeline, the low-salt wastewater is discharged to In the sewage treatment plant in the factory area, the wastewater is treated to become qualified reclaimed water, and the reclaimed water is prepared through a sodium ion exchanger to soften water; the regenerated high-concentration salt wastewater generated during the resin regeneration process is collected through the control of the concentrated salt wastewater discharge valve and the concentrated salt wastewater discharge pipeline.

[0032] A combined treatment method for high-concentration salt wastewater regenerated by a sodium ion exchanger, the treatment process is as follows:

[0033]S1, the high-concentration salt wastewater regenerated by the sodium ion exch...

Embodiment 2

[0047] A steel company uses a sodium ion exchanger to prepare softened water. After the resin of the sodium ion exchanger is saturated, 8% sodium chloride solution is used to regenerate the resin. Through the control of the wastewater discharge valve and discharge pipeline, the low-salt wastewater is discharged to In the sewage treatment plant in the factory area, the wastewater is treated to become qualified reclaimed water, and the reclaimed water is prepared through a sodium ion exchanger to soften water; the regenerated high-concentration salt wastewater generated during the resin regeneration process is collected through the control of the concentrated salt wastewater discharge valve and the concentrated salt wastewater discharge pipeline.

[0048] A combined treatment method for high-concentration salt wastewater regenerated by a sodium ion exchanger, the treatment process is as follows:

[0049] S1, lead the high-concentration salt wastewater regenerated by the sodium io...

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Abstract

The invention relates to a combined treatment method for regenerated high-concentration salt wastewater of a sodium ion exchanger, wherein the method is used for treating the regenerated high-concentration salt wastewater generated in the regeneration process of the sodium ion exchanger, and magnesium ions are separated by adopting a chemical precipitation method to obtain a magnesium hydroxide product; and calcium chloride and sodium chloride are separated by adopting a nanofiltration method, a calcium chloride solution can be used for spraying sinter ore in a sintering section, and the calcium chloride solution does not need to be evaporated and dried to prepare a solid in the process, so that the energy consumption is reduced. A sodium ion exchanger and a reverse osmosis method are adopted to separate calcium chloride, and sodium chloride is purified and concentrated, so that the obtained sodium chloride solution reaches the standard of a regenerant of the sodium ion exchanger to recycle sodium chloride in wastewater, and reverse osmosis permeate water generates reusable demineralized water; the economic investment is reduced while the regenerated high-concentration salt wastewater is reasonably and efficiently utilized, and the yield and efficiency are increased.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment and resource recycling, in particular to a combined treatment method for regenerating high-concentration salt wastewater by sodium ion exchangers in iron and steel enterprises. Background technique [0002] Iron and steel enterprises need to use a large amount of demineralized water and demineralized water in production. The treatment of high-concentration salt wastewater generated in the process of water production has always been a difficult problem, especially the regeneration of high-concentration salt wastewater by sodium ion exchangers, which is generally done after harmless treatment. Discharged directly, or discharged to a sewage treatment plant, and reused after being treated by the sewage treatment plant, these high-concentration salt wastewater greatly increases the burden of subsequent sewage treatment. [0003] In industrial enterprises, ion exchange resin rege...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01D3/06C02F101/10C02F101/12
CPCC02F9/00C01D3/06C02F1/66C02F1/5236C02F1/5263C02F1/001C02F5/02C02F5/06C02F2001/007C02F1/442C02F1/441C02F1/444C02F2101/10C02F2101/12Y02A20/131
Inventor 史玉
Owner 北京拓凯化工技术有限公司
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