Reuse and salt-reclamation treatment method for desulfurization wastewater

A technology for desulfurization wastewater and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of increased chemical dosage, secondary pollution, and high treatment costs , to achieve the effect of enhancing industrial value, avoiding waste of resources, and rationally allocating

Inactive Publication Date: 2017-05-31
SHANDONG AMS ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lime soda ash double alkali softening method is suitable for high hardness water treatment, but due to the addition of chemical agents, the salt content of the treated water is high, and the output of chemical sludge is large, causing envir

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  • Reuse and salt-reclamation treatment method for desulfurization wastewater

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] The steps of this desulfurization wastewater reuse and salt recycling method are as follows:

[0027] 1) Add caustic soda to the desulfurization wastewater to be treated, adjust the pH value to 9, and add organic sulfur, coagulant and flocculant at the same time to react and precipitate the suspended solids, heavy metals and colloidal impurities in the water, and the sludge is sent to landfill On-site treatment, the effluent is neutralized with hydrochloric acid to pH 6;

[0028] The dosing method of the caustic soda is as follows: the caustic soda is configured into a solution with a mass percentage concentration of 10%, and the caustic soda is continuously and quantitatively added to a pH value of 9 through a metering pump;

[0029] The organic sulfur is TMT-15 (purchased from Suzhou Rundongyuan Environmental Protection Technology Co., Ltd.), and the dosing method is: configure the organic sulfur into a solution with a mass percentage concentratio...

Example Embodiment

[0037] Example 2:

[0038] The steps of this desulfurization wastewater reuse and salt recycling method are as follows:

[0039] 1) Add caustic soda to the desulfurization wastewater to be treated, adjust the pH to 10, and add organic sulfur, coagulant and flocculant at the same time to react and precipitate suspended solids, heavy metals and colloidal impurities in the effluent, and the sludge is sent to landfill On-site treatment, the effluent is neutralized with hydrochloric acid to pH 7;

[0040] The dosing method of the caustic soda is as follows: the caustic soda is configured into a solution with a mass percentage concentration of 15%, and the caustic soda is continuously and quantitatively added to a pH value of 10 through a metering pump;

[0041] The organic sulfur is TMT-15 (purchased from Suzhou Rundongyuan Environmental Protection Technology Co., Ltd.), and the dosing method is: configure the organic sulfur into a solution with a mass percentage concentration of ...

Example Embodiment

[0049] Example 3:

[0050] The steps of this desulfurization wastewater reuse and salt recycling method are as follows:

[0051] 1) Add caustic soda to the desulfurization wastewater to be treated, adjust the pH value to 9, and add organic sulfur, coagulant and flocculant at the same time to react and precipitate the suspended solids, heavy metals and colloidal impurities in the water, and the sludge is sent to landfill On-site treatment, the effluent is neutralized with hydrochloric acid to pH 7;

[0052] The dosing method of the caustic soda is as follows: the caustic soda is configured into a solution with a mass percentage concentration of 13%, and the caustic soda is continuously and quantitatively added to a pH value of 9 through a metering pump;

[0053] The organic sulfur is TMT-15 (purchased from Suzhou Rundongyuan Environmental Protection Technology Co., Ltd.), and the dosing method is: configure the organic sulfur into a solution with a mass percentage concentratio...

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Abstract

The invention discloses a reuse and salt-reclamation treatment method for desulfurization wastewater. The treatment method comprises the following steps: (1) feeding caustic soda, organic sulfur, a coagulant and a flocculant into to-be-treated desulfurization wastewater, so as to react to precipitate impurities in water; (2) conveying effluent into a filter for treatment, so as to further remove substances in wastewater; (3) feeding a stabilizing agent into the effluent, conveying the effluent into a nanofiltration device, so as to form produced water containing sodium chloride and concentrated water containing supersaturated calcium sulfate; (4) feeding a destabilizing agent into the concentrated water containing supersaturated calcium sulfate, and carrying out centrifugal separation, so as to obtain calcium sulphate dihydrate crystals with a purity higher than 95%; (5) conveying the produced water containing sodium chloride into a high-pressure reverse osmosis device, and concentrating; and (6) conveying the concentrated produced water into a sodium chloride evaporator, and treating by virtue of an evaporative crystallization method, so as to obtain sodium chloride crystals with a purity higher than 95%. The reuse and salt-reclamation treatment method has the beneficial effects that the zero release is realized, and process links are reasonably configured and are continuously and stably carried out; and the cost is obviously lower than that of an existing process, and waste of resources is effectively avoided.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment method for reuse of limestone-gypsum desulfurization wastewater and salt resource utilization. Background technique [0002] The existing desulfurization wastewater reuse or zero discharge treatment mainly adopts lime soda ash double alkali softening method combined with reverse osmosis membrane concentration or evaporation process. Although lime-soda double-alkali softening method is suitable for high hardness water treatment, but due to the addition of chemical agents, the salt content of the treated water is high, and the output of chemical sludge is large, causing environmental pollution or secondary pollution. The reverse osmosis membrane concentration or evaporation concentration process can only obtain mixed salts, which cannot be recycled and need to be treated as hazardous waste, and the treatment cost is quite high. As the treatment depth of d...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/06C01F11/46
Inventor 姚付江王晓璐王兵张旭东
Owner SHANDONG AMS ENVIRONMENTAL
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