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System and method for recovering acid and alkali from high-salt-content deacidification wastewater

A technology for recovering acid-base and high-salt content, which is applied in chemical instruments and methods, gaseous effluent wastewater treatment, water pollutants, etc. It can solve the problems of inability to reuse resources and high comprehensive disposal costs, and achieve the realization of resource recovery. Effective utilization, reduction of solid waste generation, improvement of energy saving and emission reduction

Pending Publication Date: 2021-11-26
浙江省环保集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that after the deacidification wastewater is treated by the method in the prior art, the salt removed from the deacidification wastewater is a mixed salt of various components, which cannot be reused as a resource and can only be used as a solid For the problem of high cost of waste transportation and waste salt comprehensive disposal, a system and method for recovering acid and alkali from high-salt deacidification wastewater is provided. Through the cooperation of chemical reaction and membrane treatment devices with different levels of precision, The NaCl in the deacidification wastewater can be effectively separated, and NaOH and HCl can be produced by electrodialysis, so that the acid and alkali can be recovered from the deacidification wastewater, the resource utilization of the deacidification wastewater is realized, and the amount of solid waste is reduced. Improved energy saving and emission reduction

Method used

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  • System and method for recovering acid and alkali from high-salt-content deacidification wastewater
  • System and method for recovering acid and alkali from high-salt-content deacidification wastewater
  • System and method for recovering acid and alkali from high-salt-content deacidification wastewater

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Effect test

Embodiment 1

[0050] A method for reclaiming acid and alkali from high-salt deacidification wastewater using the above-mentioned system, comprising the steps of:

[0051] (1) The deacidification wastewater enters the first reaction tank after being homogenized by the homogenization tank, and CaCl is added 2 To react, CaCl 2 The dosage is 14kg / m 3 Deacidification wastewater, residence time 25min;

[0052] (2) The effluent of the first reaction tank enters the second reaction tank, adding 30wt% Na 2 CO 3 solution to react, Na 2 CO 3 The dosage of the solution is 7.6L / m 3 Deacidification wastewater, residence time 25min;

[0053](3) After the effluent of the second reaction tank passes through the sedimentation tank and the concentration tank for precipitation, the supernatant enters the ultrafiltration system for ultrafiltration. The operating pressure of the ultrafiltration device is 2.4MPa, and the influent flow rate is 30m 3 / h;

[0054] (4) The permeate after ultrafiltration ente...

Embodiment 2

[0060] The preparation method of the nanofiltration membrane in the primary and secondary nanofiltration device in embodiment 2 is:

[0061] A) ZrCl with a molar ratio of 1:1.5 4 and 2-aminoterephthalic acid dissolved in DMF, ZrCl 4 The mass volume ratio of DMF and DMF is 1g:120mL; add hydrochloric acid, ultrasonically disperse for 25min, then heat to 130°C for hydrothermal reaction for 30h, and after cooling to room temperature, filter, wash and dry the product to obtain a metal-organic framework material; the added hydrochloric acid The mass concentration is 36%, and the volume ratio of added hydrochloric acid to DMF is 1:55;

[0062] B) Add the metal organic framework material and N-methylimidazole to ethanol, and stir for 14 hours under the protection of nitrogen; then add 3-bromopropylamine hydrobromide, and reflux for 30 hours under the protection of nitrogen; wherein, the metal organic framework material, N- The mass ratio of methylimidazole and 3-bromopropylamine hyd...

Embodiment 3

[0068] A method for reclaiming acid and alkali from high-salt deacidification wastewater using the above-mentioned system, comprising the steps of:

[0069] (1) The deacidification wastewater enters the first reaction tank after being homogenized by the homogenization tank, and CaCl is added 2 To react, CaCl 2 The dosage is 8kg / m 3 Deacidification wastewater, residence time 20min;

[0070] (2) The effluent of the first reaction tank enters the second reaction tank, adding 40wt% Na 2 CO 3 solution to react, Na 2 CO 3 The dosage of the solution is 5L / m 3 Deacidification wastewater, residence time 20min;

[0071] (3) After the effluent of the second reaction tank passes through the sedimentation tank and the concentration tank for precipitation, the supernatant enters the ultrafiltration system for ultrafiltration. The operating pressure of the ultrafiltration device is 2.0MPa, and the influent flow rate is 30m 3 / h;

[0072] (4) The permeate after ultrafiltration enters...

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Abstract

The invention discloses a system for recovering acid and alkali from high-salt-content deacidification wastewater. The system is characterized by comprising a homogenizing tank, a first reaction tank, a second reaction tank, a sedimentation tank, a concentration tank, an ultrafiltration device, an ultrafiltration water producing tank, a nanofiltration device, a nanofiltration water producing tank, a reverse osmosis device, a reverse osmosis concentrated water tank and a bipolar membrane electrodialysis device which are connected in sequence, a CaCl2 dosing device is arranged over the first reaction tank, a Na2CO3 dosing device is arranged over the second reaction tank, and a hydrochloric acid dosing device is arranged above the ultrafiltration water producing tank. According to the method, NaCl in the deacidification wastewater can be effectively separated through cooperation of chemical reaction and membrane treatment devices with different levels of precision, and NaOH and HCl are prepared through electrodialysis, so that acid and alkali can be recycled from the deacidification wastewater, the resource utilization of the deacidification wastewater is realized, the solid waste output is reduced, and the energy conservation and emission reduction degree is improved.

Description

technical field [0001] The invention relates to the technical field of resource utilization of deacidification wastewater, in particular to a system and method for recovering acid and alkali from high-salt deacidification wastewater. Background technique [0002] Incineration technology is one of the effective treatment technologies for municipal solid waste and hazardous waste. With the increasingly stringent flue gas emission indicators, wet deacidification technology is an effective means to ensure that the incineration flue gas meets the emission standards, but the wet process will produce Acidic wastewater with complex composition and high salt content, the effective disposal of deacidified wastewater has become one of the key points and difficulties of zero discharge of wastewater in waste incineration plants. [0003] At present, the treatment method of deacidification wastewater is mainly to use physical and chemical treatment process to remove impurities and salt in...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/10C02F101/12C02F101/14C02F103/18
CPCC02F9/00C02F2001/007C02F1/444C02F1/442C02F1/441C02F1/4693C02F1/66C02F2103/18C02F2101/14C02F2101/101C02F2101/12Y02A20/131
Inventor 杨虎林邓强吴雯李磊马晓军王晓军潘栋
Owner 浙江省环保集团有限公司
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