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All-electric driven desulfurization waste water zero-emission treatment method and all-electric driven desulfurization waste water zero-emission treatment system

A desulfurization wastewater and treatment method technology, applied in the direction of gaseous effluent wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the high cost of evaporation and crystallization treatment, increase the cost of ton water treatment, steam consumption and power consumption High-level problems, to achieve the effect of improving resource utilization, reducing zero-emission treatment costs, and reducing CODCr content

Inactive Publication Date: 2017-12-15
SUNUP ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above four desulfurization wastewater treatment process routes have their own advantages and disadvantages, but they all have the following problems: 1) The cost of softening and adding pretreatment chemicals is high. According to calculations, the cost of softening chemicals per ton of water is 20-30 yuan / m 3 Left and right; 2) It is difficult to guarantee the purity of the crystallized salt after evaporation. When the purity is low, it can only be treated as solid waste (hazardous waste), which increases the cost of water treatment per ton; 3) The cost of evaporation and crystallization is high, and the steam consumption and power consumption are high. high processing cost

Method used

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  • All-electric driven desulfurization waste water zero-emission treatment method and all-electric driven desulfurization waste water zero-emission treatment system

Examples

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Embodiment 1

[0037] An all-electric drive zero-discharge treatment method for desulfurization wastewater, comprising:

[0038] (1) Adding Ca(OH) to desulfurization wastewater 2 , to remove F contained in desulfurization wastewater - , SO 4 2- and some Mg 2+ ;

[0039] (2) Electrolytic treatment of the effluent from step (1) for further removal of Mg 2+ , reduce NaCl concentration and COD in wastewater Cr content;

[0040] (3) Add NaOH to the effluent water of step (2), and blow in CO in the air 2 , to remove Mg from wastewater 2+ and Ca 2+ , so that the total hardness of wastewater is below 20 mg / L;

[0041] (4) Add HCl to the effluent water of step (3) and adjust the pH to 7.0~9.0, and then pass it into the first electric-driven membrane device, and the first electric-driven membrane device will - and SO 4 2- Separation to obtain SO rich in the light room feed liquid 4 2- , the concentrated chamber feed solution is rich in Cl - ;

[0042] (5) The feed liquid in the dilute...

Embodiment 2

[0049] An all-electrically driven zero-discharge treatment system for desulfurization wastewater, comprising: a reaction pool 101, in which Ca(OH) is added to the desulfurization wastewater 2 , to remove F contained in desulfurization wastewater - , SO 4 2- and some Mg 2+ ; Electrochemical device 201, the inlet of electrochemical device 201 is connected with the outlet of reaction tank 101; High-efficiency precipitation integrated equipment 301, the entrance of efficient precipitation integrated equipment 301 is connected with the outlet of electrochemical device 201; The first electrically driven membrane device 501, the inlet of the first electric-driven membrane device 501 is connected to the outlet of the high-efficiency precipitation integrated equipment 301, and the acid solution addition inlet 401 is set on the connecting pipeline, and the feed liquid outlet of the first electric-driven membrane device 501 is connected to the reaction pool 101 connected; the second e...

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Abstract

The invention belongs to the field of desulfurization wastewater treatment, and in particular relates to an all-electrically driven zero-discharge treatment method and system for desulfurization wastewater. The all-electrically driven zero-discharge treatment method and system for desulfurization wastewater provided by the present invention can be combined through the combined process of chemical reaction + electrochemical device + high-efficiency precipitation integrated equipment + a multivalent separation electric drive membrane + concentration electric drive membrane + bipolar membrane More than 90% of the water in the desulfurization wastewater can be reused, and at the same time, the Na2SO4 and NaCl in the wastewater can be used as resources, and the production of gypsum does not require the purchase of acid and alkali in the treatment process; the desulfurization wastewater driven by all electricity provided by the present invention The zero-emission treatment method and system treatment of flue gas desulfurization wastewater in thermal power plants have both economic and social benefits, and are of research and promotion value.

Description

technical field [0001] The invention belongs to the field of desulfurization wastewater treatment, and in particular relates to an all-electrically driven zero-discharge treatment method and system for desulfurization wastewater. Background technique [0002] At present, among various desulfurization methods in thermal power plants, boiler flue gas wet desulfurization accounts for an increasing proportion due to its high desulfurization efficiency, but the disadvantage of this process is that waste water is generated, and the pH value of waste water is 5-6 , and contains a large amount of suspended solids (gypsum particles, SO 2 , Al and iron hydroxide), fluoride and As, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Sn, Zn and other heavy metal elements, domestic power plants mostly use wet limestone-gypsum treatment process for desulfurization . The flue gas contains a small amount of F brought from raw coal - and Cl - and various impurities, which are washed down after entering the ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/18
CPCC02F9/00C02F1/24C02F1/463C02F1/4672C02F1/66C02F2001/007C02F2103/18C02F2301/08
Inventor 方毓淳谈宾宾李滨黄传敏朱元红
Owner SUNUP ENVIRONMENTAL TECH CO LTD
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