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Homogeneous ion-exchange membrane electrodialysis reduction treatment process for desulfurization waste water of coal-fired power plant

A homogeneous ion exchange and desulfurization wastewater technology, which is applied in the field of water treatment, can solve problems that do not involve the specific process and control methods of the concentration and weight loss process, and achieve the effects of reducing energy consumption, improving efficiency, and high concentration and weight loss

Active Publication Date: 2016-12-21
XIAMEN KENING WOTE WATER TREATMENT TECH
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  • Abstract
  • Description
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Problems solved by technology

None of these processes involves the application of homogeneous ion exchange membranes, nor does it involve the specific process and control methods of the concentration and weight loss process

Method used

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  • Homogeneous ion-exchange membrane electrodialysis reduction treatment process for desulfurization waste water of coal-fired power plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] refer to figure 1 As shown, the conventionally treated desulfurization wastewater, TDS=19209mg / L, is filtered through the tubular microfiltration device 1 to remove impurities such as suspended solids, and obtain clarified desulfurization wastewater with SS=4. The clarified desulfurization wastewater flows into the regulating tank 2 . The clarified desulfurization waste water is pre-concentrated through the reverse osmosis device 3 (one stage and two stages) to obtain pre-concentrated desulfurization waste water with TDS=31890 mg / L and reverse osmosis fresh water with TDS=410 mg / L. The reverse osmosis device 3 adopts low-pressure anti-pollution brackish water reverse osmosis membrane elements, the width of the water inlet channel is 40mil, and the membrane flux is 40L / (m 2 h), the desalination rate is 99.5%. The reverse osmosis concentrated water has a salt concentration of 3.3% (mass percentage) to achieve pre-concentration of desulfurization wastewater; the reverse ...

Embodiment 2

[0022] refer to figure 1 As shown, the conventionally treated desulfurization wastewater, TDS=21080mg / L, is filtered through a tubular microfiltration device to remove impurities such as suspended solids, and obtain clarified desulfurization wastewater with SS=4. The clarified desulfurization wastewater is pre-concentrated through the reverse osmosis device (one stage and two stages). 2 h), the desalination rate is 99%. The reverse osmosis concentrated water has a salt concentration of 2.8% (mass percentage) to achieve pre-concentration of desulfurization wastewater; the reverse osmosis fresh water has a salt concentration of ≤0.05% (mass percentage) and is returned to the desulfurization tower for flue gas desulfurization.

[0023] The pre-concentrated desulfurization wastewater (reverse osmosis fresh water TDS=430mg / L) with TDS=32870mg / L was obtained. The pre-concentrated desulfurization wastewater is pre-concentrated through the first-stage electrodialysis device, the cap...

Embodiment 3

[0026] refer to figure 1 As shown, the conventionally treated desulfurization wastewater, TDS=21080mg / L, is filtered through a tubular microfiltration device to remove impurities such as suspended solids, and obtain clarified desulfurization wastewater with SS=4. The clarified desulfurization wastewater was pre-concentrated through a reverse osmosis device (one stage and two stages) to obtain pre-concentrated desulfurization wastewater with TDS=32870 mg / L (reverse osmosis fresh water TDS=430 mg / L). The pre-concentrated desulfurization wastewater is pre-concentrated through the first-stage electrodialysis device, the capacity of the adjustment tank 2 is 15 times that of the concentrated water tank 1, the flow rate of the feed liquid is 3.4cm / sec, and the average current density is 450A / cm 2 , to obtain desulfurization wastewater after primary concentration of TDS=96500mg / L (conductivity 125mS / cm). The pre-concentrated desulfurization wastewater is deeply concentrated through t...

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Abstract

The invention belongs to the field of water treatment and particularly relates to a homogeneous ion-exchange membrane electrodialysis reduction treatment process for desulfurization waste water of a coal-fired power plant. The process comprises the following steps of: (1) filtering the desulfurization waste water by virtue of a tube-type microfiltration device; (2) performing pre-concentration on the clarified desulfurization waste water obtained in the step (1) by virtue of a reverse osmosis apparatus; (3) returning reverse osmosis fresh water obtained in the step (2) to a desulfurizing tower; (4) performing primary concentration on the pre-concentrated desulfuration waste water obtained in the step (2) by virtue of a primary electrodialysis device, thereby obtaining primarily concentrated desulfuration waste water; (5) returning primary electrodialysis fresh water obtained in the step (4) to a first regulating tank; and (6) sucking the primarily concentrated desulfuration waste water obtained in the step (4) from a first water concentration tank into a third regulating tank, then performing deep concentration by use of a secondary electrodialysis device so as to obtain deep concentrated desulfuration waste water, and enabling the deep concentrated desulfuration waste water to flow into a second water concentration tank, thereby realizing desulfuration waste water reduction treatment.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a homogeneous ion-exchange membrane electrodialysis reduction treatment process for desulfurization wastewater in a coal-fired power plant. Background technique [0002] More than 90% of coal-fired power plants in my country use limestone-gypsum desulfurization process, which will produce a large amount of desulfurization wastewater, which needs to be treated. [0003] The conventional treatment process of desulfurization wastewater is "neutralization-precipitation-coagulation", and the treated desulfurization wastewater can meet the relevant national discharge standards. However, there are a large amount of inorganic salts in these water bodies, and the salt content is generally 2-3.5% (mass percentage). Environmental protection policies require that these high-salt wastewaters be gradually treated with zero discharge. [0004] Zero discharge of high-salt wastewater m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F1/048C02F1/441C02F1/444C02F1/4693C02F9/00C02F2103/18C02F2301/08
Inventor 丘国强纪镁铃王娜娜康俊杰苗鵾鹏
Owner XIAMEN KENING WOTE WATER TREATMENT TECH
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