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Resource recovery system device and method for desulfurization wastewater

A desulfurization wastewater and recovery system technology, applied in chemical instruments and methods, gaseous effluent wastewater treatment, multi-stage water treatment, etc., can solve the problems of single chemical treatment or physical treatment, inability to realize advanced wastewater treatment and resource recovery, etc. , to achieve the effect of avoiding secondary pollution, reducing the risk of scaling, and reducing working pressure

Pending Publication Date: 2020-12-22
GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the existing desulfurization wastewater treatment methods involve a single chemical treatment or physical treatment, which cannot realize the advanced treatment and resource recovery of wastewater.

Method used

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  • Resource recovery system device and method for desulfurization wastewater

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Comparison scheme
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Embodiment 1

[0087] This embodiment provides a resource recycling method for desulfurization wastewater, the method comprising the following steps:

[0088] (1) The desulfurization wastewater with a salt content of 3wt% is passed into the concentrator 1, the chloride ion concentration in the desulfurization wastewater is 10000mg / L, and the sulfate ion concentration is 5000mg / L; The flue gas is sent to the concentrator 1, and the flow velocity of the flue gas in the concentrator 1 is 3m / s, and the flue gas is contacted with the desulfurization wastewater of the circulating spray to increase the concentration, and the liquid-gas ratio of the desulfurization wastewater of the circulating spray and the flue gas is 1L / m 3 , concentrate and obtain the concentrated waste liquid that pH value is 1, the concentration of chloride ion in the concentrated waste liquid is 18000mg / L, and the concentration of sulfate ion is 8000mg / L;

[0089] (2) The concentrated waste liquid is passed into the primary ...

Embodiment 2

[0094] This embodiment provides a resource recycling method for desulfurization wastewater, the method comprising the following steps:

[0095] (1) The desulfurization waste water with a salt content of 3.2wt% is passed into the concentrator 1, the chloride ion concentration in the desulfurization waste water is 11000mg / L, and the sulfate ion concentration is 5200mg / L; The flue gas at ℃ is sent to the concentrator 1, the flow velocity of the flue gas in the concentrator 1 is 4m / s, the flue gas is contacted with the desulfurization wastewater of circulating spray to increase concentration, and the liquid-gas ratio of the desulfurization wastewater of circulating spray and flue gas is 2L / m 3 , concentrate and obtain the concentrated waste liquid that pH value is 1.5, the concentration of chloride ion in the concentrated waste liquid is 18400mg / L, and the concentration of sulfate ion is 8400mg / L;

[0096] (2) The concentrated waste liquid is passed into the primary conditioning ...

Embodiment 3

[0101] This embodiment provides a resource recycling method for desulfurization wastewater, the method comprising the following steps:

[0102] (1) The desulfurization wastewater with a salt content of 3.4wt% is passed into the concentrator 1, the concentration of chloride ions in the desulfurization wastewater is 12000 mg / L, and the concentration of sulfate ions is 5400 mg / L; The flue gas at ℃ is sent to the concentrator 1, the flow velocity of the flue gas in the concentrator 1 is 5m / s, the flue gas is contacted with the desulfurization wastewater of circulating spray to increase concentration, and the liquid-gas ratio of the desulfurization wastewater of circulating spray and flue gas is 4L / m 3 , concentrate and obtain the concentrated waste liquid that pH value is 2.5, the concentration of chloride ion in the concentrated waste liquid is 18800mg / L, and the concentration of sulfate ion is 8800mg / L;

[0103] (2) The concentrated waste liquid is passed into the primary condi...

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Abstract

The invention provides a resource recovery system device and method for desulfurization wastewater. The resource recovery system device comprises a wastewater concentration unit, a conditioning precipitation unit, a membrane filtration unit and an evaporative crystallization unit which are connected in sequence in a material flow direction, wherein the conditioning precipitation unit comprises atleast two stages of conditioning modules which are sequentially connected in the material flow direction, and the membrane filtration unit comprises a nanofiltration device and a seawater reverse osmosis device which are sequentially connected along the material flow direction. According to the invention, chemical conditioning treatment and physical membrane filtration treatment are combined, ionsprone to precipitation are removed in advance after chemical conditioning so as to prevent membrane holes from being blocked or prevent scaling from being formed on the surface of a membrane in a membrane filtration process, and concentrated water generated by membrane filtration flows back to a wastewater concentration unit, so that magnesium ions and sulfate ions in the desulfurization wastewater entering the wastewater concentration unit are increased, and the working pressure of the wastewater concentration unit is reduced.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a recycling system device and method for desulfurization wastewater, in particular to a device and method for a resource recycling system for desulfurization wastewater combining physical treatment and chemical treatment. Background technique [0002] There are mainly three types of domestic desulfurization wastewater zero discharge technologies, namely evaporation pond, evaporation crystallization and flue evaporation. Evaporation pond is a method to reduce the volume of wastewater through natural evaporation. There are more than 10 power plants in the United States using this technology to treat desulfurization wastewater. The treatment efficiency of the evaporation pond depends on the amount of wastewater rather than the concentration of pollutants. Therefore, this method is suitable for treating high-concentration, low-volume saline wastewater. In addition, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/30C02F103/18
CPCC02F9/00C01F11/30C02F2103/18C02F1/5236C02F2301/08C02F1/442C02F1/441C02F1/04C02F2303/14
Inventor 胡静龄杨颖欣钟璐胡小吐刘勇薛学良
Owner GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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