A method for treating flue gas wet desulfurization wastewater

A wet desulfurization and waste water technology, which is applied in the field of flue gas desulfurization waste water and desulfurization zero discharge, can solve the problems of non-direct discharge, complex system, corrosion of equipment and pipelines, etc., to reduce load, reduce use cost, and reduce slag volume Effect

Active Publication Date: 2020-03-13
湖南西林环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lime milk three-box treatment method is as follows: neutralize, react, flocculate and precipitate the desulfurized wastewater, add lime milk to the neutralization tank to adjust the pH value of the wastewater to about 9-11, and remove some heavy metals and Other suspended impurities, the desulfurization wastewater treatment system is complex in configuration, and can only remove some heavy metals and suspended impurities in the wastewater, but cannot remove chloride ions in the water. After treatment, the wastewater contains high calcium, magnesium, chlorine and sulfate ions, and cannot be discharged directly , and there is greater corrosion to equipment and pipelines, and it is easier to scale, resulting in that the treated wastewater cannot enter the system for reuse
The reverse osmosis concentration method requires pretreatment of influent water, the system is relatively complex, the investment is large, the quality of recovered water is not good, and the wastewater cannot be completely reused, and a large amount of sewage still needs to be discharged to the environment
The desulfurization wastewater evaporation concentration method has high requirements on the quality of the influent water, and has the disadvantages of large equipment investment and large floor area.

Method used

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  • A method for treating flue gas wet desulfurization wastewater
  • A method for treating flue gas wet desulfurization wastewater
  • A method for treating flue gas wet desulfurization wastewater

Examples

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Embodiment 1

[0034] Synthesis of SHO resin A: It is obtained by polymerizing melamine and thiophene formaldehyde in dimethyl sulfoxide. The specific synthesis steps are as follows: add 100 grams of melamine and 133.4 grams of thiophene formaldehyde into a 500 milliliter round low flask, then add 250 milliliters of dimethyl sulfoxide solution, and heat and stir the mixture at 130 degrees Celsius under a nitrogen atmosphere for 15 hours. After cooling, the pale yellow solid was filtered out, washed with water and ethanol, and dried to obtain 210 g of a polymer product.

[0035] Synthesis of SHO resin B: obtained by polymerizing melamine and furan formaldehyde in dimethylformamide. The specific synthesis steps are as follows: add 100 grams of melamine and 114.3 grams of furfuralaldehyde into a 500 milliliter round low flask, then add 300 milliliters of dimethylformamide solution, and heat and stir the mixture at 110 degrees Celsius under nitrogen for 12 hours. After cooling, the pale yellow ...

Embodiment 2

[0038] Add 8 grams of polymer SHO resin C material into a beaker containing 10 kg of desulfurization wastewater (pH 4-6.5, chloride ion content: about 10000ppm), stir and react for 30 minutes, after flocculation, sedimentation and filtration, after treatment The wastewater meets the heavy metal discharge standard for desulfurization wastewater (DL / T 997-2006). After the heavy metal is removed, the wastewater enters the softening tank, and Na 2 CO 3 After stirring and reacting, it overflows into the clarifier and flows into the clear water tank after being clarified, and then enters the precision filter for filtration with a pump; the sludge at the bottom of the clarifier is calcium carbonate and is regularly pumped to the desulfurization tower for reuse; the water after the precision filter enters the electric The dialyzer performs dechlorination treatment, and the treated fresh water (about 8 kg, chloride ion content: 45000ppm) enters the preheater; the high-salt concentrate...

Embodiment 3

[0041] Add 10 grams of polymer SHO resin A material into a beaker containing 10 kg of desulfurization wastewater (pH 4-6.5, chloride ion content: about 10000ppm), stir and react for 40 minutes, after flocculation, sedimentation and filtration, after treatment The wastewater meets the heavy metal discharge standard for desulfurization wastewater (DL / T 997-2006). After the heavy metal is removed, the wastewater enters the softening tank, and Na 2 CO 3 After stirring and reacting, it overflows into the clarifier and flows into the clear water tank after being clarified, and then enters the precision filter for filtration with a pump; the sludge at the bottom of the clarifier is calcium carbonate and is regularly pumped to the desulfurization tower for reuse; the water after the precision filter enters the electric The dialyzer performs dechlorination treatment, and the treated fresh water (about 7 kg, chloride ion content: 40000ppm) enters the preheater; the high-salt concentrat...

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Abstract

The invention discloses a method for treating flue gas wet desulfurization wastewater, including: subjecting wet desulfurization wastewater to primary precipitation and filtration via an adjusting precipitating tank, feeding into a heavy metal removal system, and removing heavy metal ions through polymer adsorbing material; feeding outflow of the heavy metal removal system into a softening tank for calcium removal and magnesium removal, and feeding into an electrodialysis system for electrodialytic dechlorinating treatment; feeding electrodialysis concentrate into an evaporative crystallization system for evaporative or concentrative crystallization to obtain an industrial salt; recycling electrodialytic freshwater; the method has simple steps and low cost, the wastewater is fully purified and recycled, and the byproduct industrial salt is acquired; zero emission is truly achieved for flue gas wet desulfurization wastewater.

Description

technical field [0001] The invention relates to a method for treating flue gas desulfurization waste water, in particular to a method for combined treatment of wet desulfurization waste water by polymer material removal of heavy metals-electrodialysis desalination-evaporation crystallization to realize zero desulfurization discharge; it belongs to the technical field of desulfurization waste water treatment. Background technique [0002] my country is relatively rich in coal resources and is a country that uses coal as its main energy source. Coal-fired power generation is one of the most important ways to utilize coal resources in my country. Among the many air pollutants emitted by coal-fired thermal power units, SO 2 And dust is the most harmful. At present, the existing flue gas desulfurization technologies include dry desulfurization and wet desulfurization, among which limestone-gypsum wet desulfurization technology is the mainstream technology for flue gas desulfuriz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/18C02F101/20
CPCC02F1/04C02F1/285C02F1/4693C02F5/02C02F9/00C02F2001/007C02F2101/20C02F2103/18C02F2301/08C02F2303/16
Inventor 王平山王定华
Owner 湖南西林环保材料有限公司
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