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A multi-stage multi-stage nanofiltration salt separation treatment system and process

A treatment process, nanofiltration technology, applied in the field of water treatment, can solve problems such as secondary pollution, hazardous waste of miscellaneous salt, non-reuse of miscellaneous salt, etc., to ensure stable operation, reduce the amount of salt water, and improve the stability of water quality fluctuations sexual effect

Active Publication Date: 2021-10-08
INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional wastewater zero discharge process is pretreatment + membrane concentration + evaporation crystallization. The whole process does not involve salt separation treatment. In the end, the wastewater in the thick feed solution after membrane concentration is evaporated to dryness. The obtained salt is The mixed salt formed by all the salt ions in the water is commonly known as miscellaneous salt; the by-product miscellaneous salt has no reuse value and is extremely soluble, so it is easy to dissolve in water, and there is a risk of secondary pollution. Miscellaneous salt is identified as hazardous waste

Method used

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  • A multi-stage multi-stage nanofiltration salt separation treatment system and process

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Embodiment 1

[0031] A multi-stage and multi-stage nanofiltration salt separation treatment system, which includes a pretreatment unit 1, a nanofiltration A unit 2-1, a nanofiltration B unit 2-2, a NaCl deep concentration unit 3, a NaCl evaporation crystallization unit 4, and a NaCl evaporation crystallization unit 4. 2 SO 4 Deep concentration unit 5, Na 2 SO 4 Evaporation and crystallization unit 6, freezing crystallization unit 7 and reuse water unit 8, pretreatment unit 1 is connected with the water inlet side of nanofiltration A unit 2-1, the output of nanofiltration A unit 2-1 and nanofiltration B unit 2-2 The water side is connected to the water inlet side of the NaCl deep concentration unit 3, and the concentrated water side of the nanofiltration A unit 2-1 and the nanofiltration B unit 2-2 is connected to the NaCl deep concentration unit 3. 2 SO 4 The water inlet side of the deep concentration unit 5 is connected, and the product water side and concentrated water side of the nano...

Embodiment 2

[0035] Utilize the system described in embodiment 1 to carry out the method for multistage and multistage nanofiltration salt separation, take the wastewater discharged from a certain chemical industry park as an example, the wastewater volume Q: 100m 3 / h, TDS: 12268mg / L, Cl - : 5924mg / L, SO 4 2- : 996mg / L.

[0036] The wastewater is firstly treated by a pretreatment process to remove suspended solids, colloids, turbidity and hardness in the wastewater, and obtain Q: 25m 3 / h, TDS: 49073mg / L, Cl - : 25884mg / L, SO 4 2- : 3982mg / L high-salt industrial wastewater;

[0037] (1) Nanofiltration process, high-salt industrial wastewater is firstly treated by nanofiltration of nanofiltration unit A, and the concentrated water is then treated by nanofiltration of nanofiltration unit B, and the produced water of nanofiltration unit A and nanofiltration unit B is mixed Get Q: 17.5m 3 / h, TDS is 37001mg / L, Cl - : 26509mg / L, SO 4 2- : 65mg / L nanofiltration product water, get con...

Embodiment 3

[0045] Utilize the system described in embodiment 1 to carry out the method for multistage multistage nanofiltration salt separation, take the wastewater discharged from a certain chemical industry park as an example, the wastewater volume Q: 150m 3 / h, TDS: 9450mg / L, Cl - : 4000mg / L, SO 4 2- : 1100mg / L.

[0046] The wastewater is firstly treated by a pretreatment process to remove suspended solids, colloids, turbidity and hardness in the wastewater, and obtain Q: 34m 3 / h, TDS: 48127mg / L, Cl - : 24750mg / L, SO 4 2- : 4920mg / L high-salt industrial wastewater;

[0047] (1) Nanofiltration process, the concentrated brine is treated by nanofiltration of Nanofiltration A unit 2-1 to obtain Q: 23.8m 3 / h, TDS is 42433mg / L, Cl - : 25000mg / L, SO 4 2- : 340mg / L of nanofiltration product water and Q: 10.2m 3 / h, TDS is 65209mg / L, Cl - : 20653mg / L, SO 4 2- : 20022mg / L nanofiltration concentrated water;

[0048] (2) NaCl concentration and crystallization process, the nanofil...

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Abstract

The invention discloses a multistage and multistage nanofiltration salt separation treatment system, which includes a pretreatment unit, a nanofiltration A unit, a nanofiltration B unit, a NaCl evaporation crystallization unit and a NaCl evaporation and crystallization unit. 2 SO 4 Evaporation and crystallization unit; the present invention also discloses a multi-stage multi-stage nanofiltration salt separation treatment method, which includes (1) nanofiltration process, (2) NaCl concentration and crystallization process and (3) NaCl 2 SO 4 Concentration and crystallization process; this method adopts nanofiltration treatment of different stages and different sections, and realizes Cl ‑ and SO 4 2‑ After separation, the nanofiltration product water side basically only contains NaCl, and the NaCl concentration accounts for more than 99% of the dissolved solids in the nanofiltration product water. The nanofiltration product water only needs ordinary evaporation and crystallization to produce high-quality NaCl crystalline salt; The nanofiltration concentrated water is separated into salt through the combination of evaporation crystallization and freezing crystallization by thermal method-cold method to obtain high-purity Na 2 SO 4 crystallized salt.

Description

Technical field: [0001] The invention relates to a multistage and multistage nanofiltration salt separation treatment system and process, belonging to the field of water treatment. Background technique: [0002] Along with the construction and operation of large-scale coal chemical industry projects, the amount of high-salt wastewater produced by various enterprises is huge. Coal chemical wastewater has the characteristics of high salt content, high content of refractory organic matter, and large wastewater discharge, which makes some areas prominent. Water pollution problem. [0003] The choice of "zero discharge" technology for modern coal chemical industry projects has become an important way to solve the contradiction between industrial development and water resources and the environment. However, the traditional wastewater zero discharge process is pretreatment + membrane concentration + evaporation crystallization. The whole process does not involve salt separation tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/06C01D5/00
Inventor 党平赛世杰李战胜王俊辉张娜刘慧李思序杭天浜
Owner INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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