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Zero-discharge treatment method of desulfurization waste water

A technology for desulfurization wastewater and treatment methods, which is applied in the field of wastewater treatment, can solve problems such as water body impact, and achieve the effect of reducing scaling tendency and avoiding scaling or corrosion

Active Publication Date: 2016-04-20
CHENGDU RAISE ENVIRONMENTAL PROTECTION TECH CO LTD +1
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Problems solved by technology

The wastewater treated by this method still contains Ca dissolved in the wastewater 2+ , Mg 2+ , Cl - , SO 4 2- If the high concentration of salt is discharged directly for a long time, it will have a serious impact on the surrounding water body

Method used

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  • Zero-discharge treatment method of desulfurization waste water

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Embodiment

[0036] Such as figure 1 As shown, a zero-discharge treatment method for desulfurization wastewater includes the following steps: after the desulfurization wastewater is treated by a first-level chemical precipitation treatment system 1, sodium carbonate is added to the desulfurization wastewater for reaction, and then the desulfurization wastewater is precipitated and filtered. Evaporation by the multi-effect evaporator, the steam produced by evaporation is heat-exchanged to obtain condensed water, the salt slurry produced by evaporation enters the solid-liquid separation device for solid-liquid separation, and solid salt is obtained, and the scaling ions of the mother liquor in the multi-effect evaporator Before the concentration reaches the scaling concentration or the concentration of corrosion ions reaches the concentration of corrosion heat exchange tubes, part of the mother liquor in the multi-effect evaporator is introduced into the first-level chemical precipitation tre...

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Abstract

The invention discloses a zero-discharge treatment method of desulfurization waste water. The method comprises the following steps that after the desulfurization waste water is treated through a primary chemical precipitation treatment system (1), sodium carbonate is added into the desulfurization waste water to conduct a reaction, and then the desulfurization waste water is sent into a multi-effect evaporating device for evaporation after being precipitated and filtered; partial mother solution in the multi-effect evaporating device is introduced into the primary chemical precipitation treatment system (1) to be treated before the concentration of scaling ions of a mother solution in the multi-effect evaporating device reaches the scaling concentration or before the concentration of corrosion ions reaches the concentration of corroding heat exchange tubes. The zero-discharge treatment method of the desulfurization waste water has the advantages that scaling tendency of the desulfurization waste water is reduced, and the phenomena that due to scaling, heat transfer is affected, and corrosion of the heat exchange tubes in an evaporation chamber is caused are avoided; meanwhile, the desulfurization waste water is converted into a solution system of which the solute is mainly NaCl, multi-effect vacuum evaporation concentration crystallization is conducted on the desulfurization waste water by means of waste steam of a coal-fired power plant, secondary industrial salt byproducts are generated, and zero discharge of the desulfurization waste water is achieved.

Description

technical field [0001] The present invention relates to the technical field of wastewater treatment, in particular to a zero-discharge treatment method for desulfurization wastewater. Background technique [0002] In the wet flue gas desulfurization process of coal-fired power stations, in order to maintain the balance of the slurry circulation system of the desulfurization device, it is necessary to regularly discharge wastewater from the absorption tower, that is, desulfurization wastewater. Compared with the general industrial wastewater of coal-fired power stations, its water quality is quite special. Many of the substances are the first type of pollutants that are strictly controlled in the national environmental protection standards, mainly in the following aspects: (1) The wastewater is weakly acidic, PH is 4~6; (2) The content of suspended solids is high, the particles are small, and the main component is gypsum, followed by fly ash from flue gas, calcium carbonate a...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/20
CPCC02F1/04C02F1/5245C02F1/56C02F9/00C02F2001/007C02F2101/20C02F2201/002C02F2301/08
Inventor 赵齐吴学良郭桦刘汉强吕洲
Owner CHENGDU RAISE ENVIRONMENTAL PROTECTION TECH CO LTD
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