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A resource treatment method for desulfurization wastewater

A technology for desulfurization wastewater and treatment method, which is applied in gaseous discharge wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low crystalline salt, high softening agent, high cost, etc. The effect of investment cost and operating cost reduction

Active Publication Date: 2018-06-22
GUANGDONG DEGA POWER ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are big defects in this process: the softening agent is very high, the crystalline salt produced is low-value salt, and a large amount of aqueous sludge will be produced at the same time
Therefore, although the softening method seems to be able to achieve zero discharge of desulfurization wastewater, the cost of its realization is quite expensive

Method used

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  • A resource treatment method for desulfurization wastewater
  • A resource treatment method for desulfurization wastewater
  • A resource treatment method for desulfurization wastewater

Examples

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Effect test

Embodiment 1

[0044] like Figure 1-2 As shown, a resource treatment method for desulfurization wastewater comprises the following steps:

[0045] 1) Pretreatment: Add alkali and coagulant aid respectively to the wastewater, and remove the precipitate after the suspended solids settle; the dosage of the alkali is 2g / L, and the dosage of the coagulant aid is 2mg / L , the alkali is slaked lime, and the coagulant aid is polyacrylamide;

[0046] 2) Concentration and evaporation: the waste water treated in step 1) is passed into the evaporator, and the waste water is evaporated. In the initial stage of evaporation, calcium sulfate crystals are added to the waste water as crystal seeds for crystallization, so that the sulfuric acid in the waste water The concentration of calcium crystals is greater than 10g / L; when the amount of waste water is reduced to 5% of the incoming amount, the evaporation is stopped, and the obtained concentrated solution is passed into the clarification tank for clarific...

Embodiment 2

[0050] like Figure 1-2 As shown, a resource treatment method for desulfurization wastewater comprises the following steps:

[0051] 1) Pretreatment: add a coagulant aid to the wastewater, and after the suspended matter settles, perform Fenton chemical oxidation treatment on the wastewater, and finally add alkali and coagulant aid to the oxidized wastewater, and remove the wastewater after standing The sediment in; the dosage of described alkali is 1g / L, and the dosage of described coagulant aid is 5mg / L, and described alkali is caustic soda, and described coagulant aid is polyacrylamide;

[0052] 2) Concentration and evaporation: the waste water treated in step 1) is passed into the evaporator, and the waste water is evaporated. In the initial stage of evaporation, calcium sulfate crystals are added to the waste water as crystal seeds for crystallization, so that the sulfuric acid in the waste water The concentration of calcium crystals is greater than 10g / L; when the amount...

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Abstract

The invention relates to a desulfurization wastewater resourceful treatment method. The method comprises the following steps of 1, pretreatment, wherein suspended solids in desulfurization wastewater are removed; 2, concentration evaporation, wherein wastewater is subjected to evaporation treatment, in the initial stage of evaporation, calcium sulfate crystals are put into the wastewater, and after evaporation is ended, wastewater is cleared up; 3, crystallization evaporation, wherein the concentration of ions in wastewater is adjusted, crystallization points of the solution are made to fall into a crystallization region of a magnesium sulfate monohydrate salt or crystallization regions of magnesium sulfate monohydrate and sodium chloride salts, and then wastewater is subjected to evaporation crystallization; 4, crystallization salt separation, wherein the obtained mixed salt is separated to obtain a magnesium sulfate monohydrate crystallization salt and a sodium chloride crystallization salt. According to the desulfurization wastewater resourceful treatment method, the investment and operation costs are low, and two high-value industrial salts of magnesium sulfate and sodium chloride can be obtained.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to the technical field of desulfurization waste water resource treatment. Background technique [0002] Wet desulfurization wastewater from coal-fired power plants is wastewater with high concentration of suspended solids, high chloride ions, high magnesium ions, high salt content, and high fouling properties. It is highly polluting to the environment and difficult to treat. biggest difficulty. [0003] At present, with the improvement of national environmental protection requirements and water-saving requirements, domestic coal-fired power plants generally consider reuse of desulfurization wastewater after treatment. The treatment process includes pretreatment and advanced treatment. Pretreatment generally removes heavy metal pollution in wastewater by adding alkali Insoluble substances are transformed into insoluble substances, and then heavy metals and suspended solids are r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10B01D9/02C02F103/18
CPCB01D1/26B01D9/00B01D9/0036C02F1/048C02F1/56C02F1/72C02F9/00C02F2103/18
Inventor 黄皆斌龙国庆胡淼陈卓彬覃耀王孝夫
Owner GUANGDONG DEGA POWER ENVIRONMENTAL PROTECTION TECH CO LTD
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