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A kind of removal method of chloride ion in desulfurization wastewater

A technology for desulfurization wastewater and chloride ions, which is applied in the fields of energy wastewater treatment, chemical instruments and methods, and water pollutants. Improved removal efficiency, low cost of chlorine removal, and maintenance-free effects

Active Publication Date: 2022-07-12
SHANDONG GUOSHUN CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Main problems: (1) The salt removal rate of the system is not high enough, generally 60%-75%, while the removal efficiency, generally speaking, the removal rate of chloride ions is high
Electrodialysis is suitable for treating chlorine-containing wastewater with small water volume and low concentration, but it consumes a lot of water and electricity, and the cost is high, and the dialysis membrane is easy to clog
[0010] In summary, due to the high cost of existing methods for removing chloride ions, the development of removing chloride ions in wastewater has been hindered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for removing chloride ions in desulfurization wastewater, the steps are as follows:

[0045] 1. Add 3CaO·Al to desulfurization wastewater 2 O 3 , until the pH of the desulfurization wastewater is 7, mix and stir for 30 minutes to remove sulfate radicals to form ettringite precipitates 3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O, filter and separate ettringite and desulfurization wastewater.

[0046] 2. The calcium hydroxide Ca(OH) 2 , Aluminum powder Al is added to the desulfurization wastewater filtered in step 1 according to the mass ratio of 5:4, and the pH value is adjusted to 9. At this time, the addition amount of aluminum powder per liter of desulfurization wastewater is 0.4g / L.

[0047] 3. Use ultrasonic vibrating rod to mix thoroughly for 30min to promote chemical reaction.

[0048] 4. Adjust the water temperature to 60℃, keep the constant temperature for 48h and shake it to form white hydrated calcium chloroaluminate 3CaO·Al 2 O 3 ·3CaCl 2 ·30H 2 O pre...

Embodiment 2

[0052] A method for removing chloride ions in desulfurization wastewater, the steps are as follows:

[0053] 1. Add 3CaO·Al to desulfurization wastewater 2 O 3 , until the pH of the desulfurization wastewater is 7, mix and stir for 30 minutes to remove sulfate radicals to form ettringite precipitates 3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O, filter and separate ettringite and desulfurization wastewater.

[0054] 2. The calcium hydroxide Ca(OH) 2 , Aluminum powder Al is added to the desulfurization wastewater after filtering in step 1 according to the mass ratio of 5:4, and the pH value is adjusted to 8.

[0055] 3. Use ultrasonic vibrating rod to mix thoroughly for 30min to promote chemical reaction.

[0056] 4. Adjust the water temperature to 60℃, keep the constant temperature for 48h and shake it to form white hydrated calcium chloroaluminate 3CaO·Al 2 O 3 ·3CaCl 2 ·30H 2 O precipitation simultaneously removes chloride ions.

[0057] 5. Form chloride ions and additives in...

Embodiment 3

[0060] A method for removing chloride ions in desulfurization wastewater, the steps are as follows:

[0061] 1. Add 3CaO·Al to desulfurization wastewater 2 O 3 , until the pH of the desulfurization wastewater is 7, mix and stir for 30 minutes to remove sulfate radicals to form ettringite precipitates 3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O, filter and separate ettringite and desulfurization wastewater.

[0062] 2. The calcium hydroxide Ca(OH) 2 , Aluminum powder Al is added to the desulfurization wastewater after filtering in step 1 according to the mass ratio of 5:4, and the pH value is adjusted to 10.

[0063] 3. Use ultrasonic vibrating rod to mix thoroughly for 30min to promote chemical reaction.

[0064] 4. Adjust the water temperature to 60℃, keep the constant temperature for 48h and shake it to form white hydrated calcium chloroaluminate 3CaO·Al 2 O 3 ·3CaCl 2 ·30H 2 O precipitation simultaneously removes chloride ions.

[0065] 5. Chloride ions and additives in wat...

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PUM

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Abstract

The invention discloses a method for removing chloride ions in desulfurization wastewater. Calcium aluminate is added to the desulfurization wastewater for pretreatment, and after the primary precipitation is removed, calcium hydroxide and aluminum powder are added, and the pH is adjusted to alkali. Then, ultrasonic treatment is carried out, and then secondary precipitation is generated by heat treatment, and the secondary precipitation is removed. The invention is not only suitable for the removal of chloride ions in a large amount of waste water, but also can effectively reduce the cost of chlorine removal.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and reuse, and relates to a method for removing chloride ions in desulfurization wastewater. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Power plants and steel plants have large industrial water consumption, and unreasonable use can easily lead to waste of water resources. Therefore, a water consumption model with zero discharge of wastewater in power plants and steel plants is imperative. Under the urgent requirement of zero discharge of wastewater from power plants and steel plants, the content of chloride ions is an important indicator for the recycling of wastewater fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/10C02F101/12C02F101/20
CPCC02F9/00C02F1/5236C02F1/66C02F1/36C02F1/02C02F2001/007C02F2101/12C02F2101/20C02F2101/105C02F1/281Y02W10/37
Inventor 吕杨杨杨凤岭吕扬乔正泽仇洪波王国威尹鹏管闯卢忠阳王立荣
Owner SHANDONG GUOSHUN CONSTR GRP
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