Method and device of quality-orientated crystallization treatment on desulfurization waste water

A technology for desulfurization wastewater and crystallization treatment, which is applied in the direction of gaseous effluent wastewater treatment, dehydration/drying/thickened sludge treatment, multi-stage water treatment, etc. to avoid fouling of the membrane, increase water recovery rate, and save civil engineering costs

Pending Publication Date: 2017-07-14
BEIJING TDR ENVIRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of high evaporation energy consumption, easy fouling of equipment, and difficult recycling of the mixed salt obtained by evaporation, the present invention provides a method for fractional crystallization treatment of desulfurization wastewater, which includes the following steps:

Method used

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  • Method and device of quality-orientated crystallization treatment on desulfurization waste water
  • Method and device of quality-orientated crystallization treatment on desulfurization waste water
  • Method and device of quality-orientated crystallization treatment on desulfurization waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A desulfurization wastewater project, the treated water volume is 22t / h, influent water quality: pH: 7.16, total dissolved solids (TDS): 49750mg / L, Cl - : 20821.8mg / L, SO 4 2- : 3534.3mg / L, Mg 2+ : 6220mg / L, Ca 2+ : 1933mg / L, HCO 3 - : 60.556mg / L, chemical oxygen demand (COD): 944.68mg / L.

[0062] Treatment requirements: the effluent meets the cooling water standard of power plant auxiliary equipment: pH: 6-9, total dissolved solids (TDS) ≤ 1000mg / L, Cl - : ≤250mg / L, SO 4 2- : ≤250mg / L, total hardness (as CaCO 3 Total) ≤ 450mg / L, chemical oxygen demand (COD) ≤ 50mg / L, effluent reuse, salt separation, and zero discharge treatment of wastewater.

[0063] Selected process:

[0064] Softening pretreatment→ultrafiltration→sodium ion exchanger→dish tube nanofiltration salt separation→dish tube reverse osmosis→freezing crystallization and evaporation crystallization.

[0065] After the desulfurization wastewater is pre-sedimented in the regulating tank, it enters th...

Embodiment 2

[0072] For a desulfurization wastewater project, the treated water volume is 36t / h, the influent water quality: pH: 7.24, total dissolved solids (TDS): 35534.6mg / L, Cl - : 15000mg / L, SO 4 2- : 6000mg / L, Mg 2+ : 600mg / L, Ca 2+ : 2000mg / L, HCO 3 - : 65mg / L, chemical oxygen demand (COD): 95mg / L.

[0073] Treatment requirements: the effluent meets the power plant circulating cooling water standard: pH: 6-9, total dissolved solids (TDS) ≤ 1000mg / L, Cl - : ≤250mg / L, SO 4 2- : ≤250mg / L, total hardness (as CaCO 3 Total) ≤ 450mg / L, chemical oxygen demand (COD) ≤ 50mg / L, effluent reuse, salt separation, and zero discharge treatment of wastewater.

[0074] Selected process:

[0075] Softening pretreatment → ultrafiltration → sodium ion exchanger → nanofiltration salt separation → reverse osmosis → freeze crystallization and evaporation crystallization.

[0076] After the desulfurization wastewater is pre-sedimented in the regulating tank, it enters the first reaction tank 1, a...

Embodiment 3

[0083] For a desulfurization wastewater project, the treated water volume is 15t / h, the influent water quality: pH: 7.42, total dissolved solids (TDS): 30000mg / L, Cl - : 7860mg / L, SO 4 2- : 7530mg / L, Mg 2+ : 800mg / L, Ca 2+ : 1800mg / L, HCO 3 - : 10.9mg / L, chemical oxygen demand (COD): 450mg / L.

[0084] Treatment requirements: the effluent meets the power plant circulating cooling water standard: pH: 6-9, total dissolved solids (TDS) ≤ 1000mg / L, Cl - : ≤250mg / L, SO 4 2- : ≤250mg / L, total hardness (as CaCO 3 Total) ≤ 450mg / L, chemical oxygen demand (COD) ≤ 50mg / L, effluent reuse, salt separation, and zero discharge treatment of wastewater.

[0085] Selected process:

[0086] Softening pretreatment → ultrafiltration → sodium ion exchanger → nanofiltration salt separation → reverse osmosis → freeze crystallization and evaporation crystallization.

[0087] After the desulfurization wastewater is pre-sedimented in the regulating tank, it enters the first reaction tank 1, a...

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Abstract

The invention relates to a method and a device of quality-orientated crystallization treatment on desulfurization waste water. The invention effectively integrates a desulfurization waste water softening pretreatment technology, a membrane separation technology and a crystallization technology, carries out softening pretreatment on the desulfurization waste water to lower the hardness of the desulfurization waste water firstly, then carries out salt separation treatment and concentration treatment on the desulfurization waste water subjected to softening pretreatment by adopting the membrane separation technology to separate sodium sulfate and sodium chloride in the desulfurization waste water and utilizes the sodium sulfate in the waste water recovered by utilizing cooling crystallization and evaporative crystallization treatment to prepare sodium sulfate decahydrate crystals with purity larger than or equal to 98 percent and sodium chloride crystals with purity larger than or equal to 94 percent at the same time finally to realize zero-pollution emission of the desulfurization waste water. By adopting the method and the device, the technical problems that if the desulfurization waste water is directly evaporated, the energy consumption is high, equipment is liable in scaling, and mixed salts obtained by evaporation are difficultly recycled are solved, the cost is saved, the resource utilization of the desulfurization waste water to the maximum is realized, and comprehensive recycling of the desulfurization waste water is truly realized.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method and a device for realizing zero discharge in advanced treatment of desulfurization wastewater. Background technique [0002] At present, my country's power supply enterprises generally use wet limestone-gypsum desulfurization process to desulfurize flue gas, which has been widely used because of its advantages of high desulfurization efficiency, wide use of coal types, and mature gypsum utilization technology. During the desulfurization by wet desulfurization process, the slurry in the desulfurization absorption tower is recycled repeatedly, and the soluble salt slurry in the tower is continuously concentrated. In order to ensure the desulfurization performance and maintain the balance of chloride ions in the system, it is necessary to continuously replenish and update the slurry. The thick slurry in the absorption tower The supernatant liquid separated by the hydrocyclon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F11/12C01D3/06C01D3/14C01D5/16C02F103/18
CPCC01D3/06C01D3/14C01D5/16C02F9/00C02F11/12C02F11/122C02F1/42C02F1/048C02F1/001C02F1/444C02F1/442C02F1/66C02F5/02C02F2103/18C02F2301/08
Inventor 齐奇谢涛张立娜饶斌
Owner BEIJING TDR ENVIRON TECH CO LTD
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