Method for separating desulfurization waste water by using electric drive membrane

A desulfurization wastewater and electric-driven membrane technology, applied in the field of desulfurization, can solve the problems of strong corrosion, and achieve the effects of enhanced residual chlorine resistance, convenient desalination of high-salt water and concentration of wastewater, and good self-cleaning effect

Inactive Publication Date: 2017-12-01
辽宁清新环境科技有限公司
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Problems solved by technology

[0007] highly corrosive

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  • Method for separating desulfurization waste water by using electric drive membrane
  • Method for separating desulfurization waste water by using electric drive membrane

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Embodiment 1

[0038] A method for separating desulfurization wastewater by using an electrically driven membrane, the method is as follows

[0039] Step A) front-end pretreatment: first collect the desulfurization wastewater into the collection tank for preliminary precipitation; then enter the triple tank; the triple tank is a neutralization tank, a settling tank and a flocculation tank; In the neutralization tank, 5% milk of lime solution is added to the neutralization tank to form a precipitate, and about 5% milk of lime solution is added to the neutralization tank to increase the pH value of the wastewater to above 9.0. In this environment, most heavy metal ions will Insoluble hydroxides formed and precipitated. After the reaction, the desulfurization wastewater enters the settling tank, and organic sulfide (sodium sulfide) is added to the settling tank to form a precipitate again, and the heavy metal ions form insoluble hydroxides. At the same time, the Ca in the milk of lime 2+ with ...

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Abstract

The invention relates to the technical field of desulfurization and particularly discloses a method for separating desulfurization waste water by using an electric drive membrane. The method comprises the following steps of (A) front-end pretreatment; (B) separation and concentration by the electric drive membrane; and (C) multiple-effect evaporation crystallization. The water production rate of the method can reach over 95%, if water quality of a system fluctuates, when the SO4<2-> content is relatively high, excessive scaling of an assembler can be avoided by only adopting a rearrangeable electrode, that is to say, the system has a good self-cleaning effect on inorganic salt scaling. Compared with a double-membrane method, the residual chlorine resistance of the electric drive membrane is greatly enhanced, so that a small amount of fungicide can be added and the system is prevented from being polluted by bacteria; and meanwhile, the electric drive membrane runs through the propelling force from DC, so that the method also has a sterilization effect on microorganisms.

Description

technical field [0001] The invention relates to the technical field of desulfurization, in particular to a method for separating desulfurization wastewater by using an electrically driven membrane. Background technique [0002] At present, limestone-gypsum wet desulfurization is the most widely used method in flue gas desulfurization engineering of thermal power plants. The principle of FGD (Flue Gas Desulfu-rization) is: the lime slurry is sprayed in the absorption tower, and the SO in the flue gas 2 The reaction produces CaSO 3 , CaSO 1 , so as to remove SO from the flue gas 2 . [0003] This method has a larger wastewater treatment problem. In order to control the concentration of harmful elements such as Cl- and F- in the limestone circulating slurry of the desulfurization absorption tower and the enrichment of fine dust particles, reduce the corrosion and blockage of the equipment by the slurry, and discharge the washed fly ash in the flue gas , a certain amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/18
CPCC02F1/04C02F1/469C02F1/5236C02F1/66C02F5/08C02F5/14C02F9/00C02F2001/007C02F2103/18
Inventor 王卫星
Owner 辽宁清新环境科技有限公司
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