Steel wet desulphurization wastewater treatment system and method

A wastewater treatment system, wet desulfurization technology, applied in metallurgical wastewater treatment, gaseous effluent wastewater treatment, water/sewage treatment, etc., can solve secondary pollution, can not completely realize zero discharge of desulfurization wastewater pollutants, wastewater or crystallization Solve problems such as complex salt composition, and achieve the effect of reducing the operating burden

Pending Publication Date: 2021-05-14
中冶北方(大连)工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main treatment processes for this kind of wet desulfurization wastewater mainly include chemical precipitation method, concentration reduction + evaporation crystallization. The wastewater or crystallized salt produced by the above process has complex components and secondary pollution, which will increase the production cost and burden of enterprises. And can not completely realize the zero discharge of desulfurization wastewater pollutants
After the wet desulfurization wastewater is treated, it must meet the direct discharge standard in the "Discharge Standard of Water Pollutants for the Iron and Steel Industry" (GB13456-2012). However, the pollution factors of this type of wastewater are complex and the concentration is high. Without good operation, it is difficult to meet this standard. The wastewater contains a large amount of gypsum suspended matter, chloride ions, ammonia nitrogen, sulfate ions and COD and other complex factors, which are highly corrosive and difficult to circulate. use

Method used

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  • Steel wet desulphurization wastewater treatment system and method
  • Steel wet desulphurization wastewater treatment system and method
  • Steel wet desulphurization wastewater treatment system and method

Examples

Experimental program
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Embodiment 1

[0085]figure 2A structure of a steel wet desulfurization wastewater treatment system for this embodiment is shown schematically. Such asfigure 2As shown, the system includes a wastewater collecting apparatus, a plate frame filter device, a secondary chemical defective device, a concentrated precipitation apparatus, a filtration device, a deammorer device, a softening apparatus, a softening apparatus, a softening apparatus, a softening apparatus, a softening apparatus, a softening device, a filter device, a softening device, a filter device And film treatment device / electrodialysis device. Specifically, the first inlet with stirred wastewater collecting device 1 is used to input wet desulfurization wastewater, and the first outlet of the wastewater collecting device 1 is connected to the plate frame filter device 2, and the plate frame filter device 2 The first exit is connected to the first inlet of the first stage chemical reaction device 3-1, and the first exit of the first stag...

Embodiment 2

[0091]In this embodiment, the initial water quality of desulfurization wastewater is shown in Table 1:

[0092]Table 1 Desulfurization wastewater initial water quality

[0093]

[0094]

[0095]figure 1 The flow of the steel wet desulfurization wastewater treatment method in the present invention is shown schematically. Bonded belowfigure 1 Description of the processing method of this embodiment:

[0096]1) In the abandoned wastewater collecting device 1, the wastewater collecting apparatus 1 has solid-liquid separation in the wastewater collecting plate filter device 2, and obtains high salt wastewater and dry mud.

[0097]2) Putting the plate frame filter device 2 in step 1) contains high salt wastewater into the first stage chemical reaction device 3-1 (the first level chemical reaction device 3-1 is stirred, and the concentration 5 is added % Of the calcium hydroxide solution and concentration of 15% alkaline solution), adjusted to pH = 11.5; again into the first stage chemical precipitation appa...

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Abstract

The invention discloses a steel wet desulphurization wastewater treatment system and method. The method comprises the following steps: carrying out plate-and-frame pressure filtration, secondary chemical hardness removal, concentration precipitation on steel wet desulfurization wastewater, conducting filtration treatment to remove impurities in the wastewater, carrying out deamination treatment to remove ammonia nitrogen in the wastewater, and carrying out softening treatment, nanofiltration membrane treatment, membrane treatment or electrodialysis treatment and evaporative crystallization treatment to obtain clear water and high-purity sodium sulfate and sodium chloride. According to the method, complex factors such as gypsum suspended solids, high hardness, high chloride ions, high ammonia nitrogen, high sulfate ions, fluorine ions, heavy metal ions and COD in the wastewater can be effectively removed, the obtained clear water can be recycled as industrial new water, and zero discharge treatment of the steel wet desulfurization wastewater is realized; and high-purity sodium chloride and sodium sulfate salt with certain economic recovery value are obtained, so that recycling of resources is realized.

Description

Technical field[0001]The present invention relates to the field of resource environment wastewater treatment, in particular, to a steel wet method desulfurization wastewater treatment system.Background technique[0002]Commonly used flue gas desulfurization methods are wet, semi-drying and dry methods. In many desulfurization techniques, limestone-gypsum wet flue gas desulfurization processes become a wide range of desulfurization techniques for steel mills in terms of technology maturation, high desulfurization efficiency and good intention to flue gas conditions. However, during operation of the desulfurization process, HCl, particulate matter, heavy metals in flue gas is constantly enriched in desulfurization slurry, enriched to a certain extent, causing a variety of desulfurization efficiency, equipment corrosion acceleration, etc., therefore, must be discharged A certain amount of wastewater is controlled to control the concentration of various impurities in desulfurization.[0003...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F9/10C01D3/08C01D3/22C01D5/00C02F103/16C02F103/18
CPCC01D3/08C01D3/22C01D5/004C02F1/001C02F1/04C02F1/42C02F1/44C02F1/442C02F1/444C02F1/4693C02F5/00C02F9/00C02F2001/007C02F2103/16C02F2103/18
Inventor 高丕强葛程程杨驰刘新
Owner 中冶北方(大连)工程技术有限公司
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