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Method and system for treating desulfurization wastewater in zero-discharge manner on basis of electrodialysis

A technology for desulfurization wastewater and treatment method, which is applied in gaseous discharge wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. problems, to reduce the cost of dosing and the workload of dispensing, ensure long-term stable operation, and reduce the effect of membrane fouling index

Inactive Publication Date: 2016-12-21
SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD +1
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Problems solved by technology

[0003] However, there are the following disadvantages: (1) Due to the characteristics of large changes in the quality and quantity of desulfurization wastewater and high salt content in wastewater, the treatment device for desulfurization wastewater produces solid miscellaneous salts. The complex composition of miscellaneous salts cannot be recycled and can only be treated as hazardous waste.
Not only that, due to the high investment cost of the desulfurization system, and the lack of a process that can make corresponding adjustments based on changes in water quality and quantit

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  • Method and system for treating desulfurization wastewater in zero-discharge manner on basis of electrodialysis
  • Method and system for treating desulfurization wastewater in zero-discharge manner on basis of electrodialysis

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[0055] Example 2:

[0056] See figure 1 with figure 2 This example 2 uses 300L of flue gas desulfurization wastewater from another power plant, calcium ion concentration is 800mg / L, magnesium ion concentration is 5000mg / L, sulfate ion is 8520mg / L, chloride ion is 6530mg / L, and pH is 6.7. Wastewater: neutralize to pH=9.5 by adding alkali solution, flocculate and settle for 15 minutes, add 30g softener to the clarified liquid, pass through a multi-media precision filter, and then enter the electrodialysis treatment after the effluent passes through the pH adjustment. The electrodialysis uses 400* A homogeneous membrane stack of 800,50 pairs of membranes, an electrodialyzer of one stage and one stage, batch cycle treatment, 35L of electrodialysis concentrated water is used for bipolar membrane acid and alkali production to prepare lye with pH=12.2 , PH=2.4 acid solution for reuse in the pretreatment process. Take 250L conductivity of electrodialysis concentrated water to bypass f...

Example Embodiment

[0061] Example 3:

[0062] See figure 1 with figure 2 This example 3 uses 500L of flue gas desulfurization wastewater from another power plant, calcium ion concentration is 520mg / L, magnesium ion concentration is 3200mg / L, sulfate radical is 6300mg / L, chloride ion is 5500mg / L, and pH is 6.5 desulfurization Wastewater; through neutralization, flocculation and sedimentation, adding 20g softener, passing through a precision filter, the effluent enters the electrodialysis treatment, the electrodialysis adopts a homogeneous membrane stack of 400*800,70 pairs of membranes, one-stage electrodialysis It is carried out in batch cycle treatment mode, and 80L of electrodialysis concentrated water is used to make acid and alkali with bipolar membrane. Take 380L conductivity as electrodialysis concentrated water to bypass the flue evaporation equipment for atomization and evaporation.

[0063] System operation effect:

[0064] 1. The suspended matter in the neutralization tank is quickly prec...

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Abstract

The invention relates to the field of technologies for treating environmental engineering wastewater, in particular to a method and a system for treating desulfurization wastewater in a zero-discharge manner on the basis of electrodialysis. The method and the system have the advantages that electrodialysis concentrated water is regulated and distributed into a bipolar membrane electrodialyzer and a flue evaporating apparatus in membrane treatment phases, acid and alkali can be manufactured by the bipolar membrane electrodialyzer and flow back for pretreatment and membrane treatment, and accordingly the wastewater can be reduced and recycled; electrodialysis fresh water flows back for membrane treatment, accordingly, the reuse rate of the fresh water can be increased, the pretreatment chemical feeding cost and chemical preparation workload can be reduced, and desalting load and tail-end evaporation crystallization load on the system can be integrally relieved; tail-end treatment of the system is effectively regulated, accordingly, the method and the system can cope with different types of variation of water quality and water volumes of power plants, and the integral system can assuredly stably run; zero-discharge effects are realized by the system for treating the desulfurization wastewater, environment-friendly design requirements on treating waste by the aid of waste can be met, and the method and the system have broad application prospects.

Description

technical field [0001] The invention relates to the technical field of environmental engineering wastewater treatment, in particular to a zero-discharge treatment method and system for desulfurization wastewater based on electrodialysis. Background technique [0002] At present, with the improvement of national discharge standards, zero discharge treatment of desulfurization wastewater is gradually implemented. The existing desulfurization wastewater process generally includes softening pretreatments such as neutralization, precipitation, coagulation, neutralization and mud dehydration treatment (adding drugs to coagulate and clarify the desulfurization wastewater, removing most of the hardness, alkalinity and suspended matter; softening the effluent into The filtration system further removes suspended solids; the sludge produced by chemical reactions enters the dehydration system for desliming), membrane concentration treatment (using various types of membranes to perform c...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F9/06C02F101/10C02F101/20C02F103/18
CPCC02F1/001C02F1/4693C02F1/52C02F1/66C02F5/08C02F9/00C02F2001/46128C02F2101/10C02F2101/20C02F2103/18C02F2201/46115C02F2209/05C02F2209/06C02F2209/10C02F2301/08Y02A20/124
Inventor 黄奕军苑志华郑煜铭万忠诚
Owner SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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