Desulfurization wastewater treating method and device

A technology for desulfurization wastewater and treatment methods, applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of difficult desalination, high cost, low water resource utilization rate, etc., and achieve reduction Cost, low cost effect

Active Publication Date: 2017-02-22
CHNA ENERGY INVESTMENT CORP LTD +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a low-cost, high water resource utilization and better desalination method for the defects of the existing desulfurization wastewater tre

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  • Desulfurization wastewater treating method and device

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Embodiment 1

[0077] This embodiment is used to illustrate the desulfurization wastewater treatment method and its device of the present invention.

[0078] The desulfurization wastewater is sent to the triple box for neutralization treatment, sedimentation treatment and flocculation treatment in sequence, and the effluent of the flocculation box is sent to the concentration clarifier, and further concentrated and clarified under the addition of polyacrylamide to obtain the supernatant Y1 (water quality is as follows shown in Table 1), using figure 1 The device shown was used for further processing. That is, the supernatant is sent to the softening pretreatment unit 1, and sodium carbonate is added until no calcium carbonate precipitates are produced to obtain calcium carbonate precipitates and softened desulfurization wastewater Y2, and the resulting calcium carbonate precipitates are sent to the desulfurization slurry pool of the desulfurization tower Gypsum is prepared in gypsum; the ob...

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Abstract

The invention relates to the field of wastewater treatment, in particular to a desulfurization wastewater treating method and device. The desulfurization wastewater treating method comprises the steps that softening pretreatment is conducted on clear liquid obtained through flocculation treatment and alkali carbonate to obtain calcium carbonate precipitate and softened desulfurization wastewater; nanofiltration treatment is conducted on the softened desulfurization wastewater to obtain sulfuric-acid-rich salt water and sulfuric-acid-deficient salt water; reverse osmosis treatment is conducted the sulfuric-acid-deficient salt water to obtain first chlorine-rich concentrated water and first fresh water; electrodialysis treatment is conducted on the chlorine-rich concentrated water to obtain second chlorine-rich concentrated water and second fresh water; evaporation crystallization treatment is conducted on the second chlorine-rich concentrated water to obtain chlorine salt and third fresh water, wherein the nanofiltration treatment is cyclically conducted on the sulfuric-acid-rich salt water and the softened desulfurization wastewater. By the adoption of the method, wastewater produced after flue gas desulfurization of coal-fired power plants and the like can be effectively treated, the treated wastewater can be resourcefully utilized, the cost for removing and recovering chlorine-containing salt can be reduced, and more purified water can be obtained.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method and device for desulfurization wastewater. Background technique [0002] Coal-fired power plant water is the largest industrial water industry in my country, accounting for about 30-40% of the total industrial water use. In order to improve the comprehensive utilization rate of water, power plants generally use various types of drainage such as reverse osmosis concentrated water and circulating water sewage as process water sources for wet desulfurization systems. Desulfurization wastewater has become the worst wastewater at the end of coal-fired power plants, and it is also a key constraint factor for the zero discharge of wastewater in the whole plant. [0003] Desulfurization wastewater has the characteristics of high salt content, high suspended solids and chloride ion content, high hardness, strong acid corrosion and easy scaling. At present, the conv...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/18
CPCC02F1/04C02F1/441C02F1/442C02F1/4693C02F1/5236C02F1/66C02F9/00C02F2103/18
Inventor 钟振成熊日华程子洪李小端张微尘李国涛刘捷霍卫东卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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