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Desulfurization wastewater treatment method and system thereof

A technology for desulfurization wastewater and a treatment method, applied in the field of desulfurization, can solve the problems of increasing the difficulty of recovering other useful substances, difficult to recover calcium and magnesium ions, etc., and achieve the effects of reducing the difficulty of recovery, improving the purity, and reducing the amount of formation.

Pending Publication Date: 2020-05-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesium ion precipitation and calcium ion precipitation contained in desulfurization wastewater are finally removed in the form of sludge, which not only makes it difficult to recover calcium and magnesium ions, but also increases the difficulty of recovering other useful substances in desulfurization wastewater

Method used

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  • Desulfurization wastewater treatment method and system thereof
  • Desulfurization wastewater treatment method and system thereof
  • Desulfurization wastewater treatment method and system thereof

Examples

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Effect test

Embodiment 1

[0115] Step S100: Pass 15 t / h of desulfurization wastewater into the primary adjustment tank 110, and then add a sodium hydroxide solution with a mass concentration of 10% to the desulfurization wastewater so that the pH value of the desulfurization wastewater = 9.5, and at the same time, add TMT- 15 heavy metal ion remover, aluminum sulfate and polyacrylamide, stirred and reacted for 30min, then the desulfurization wastewater was passed into the primary clarifier 120 and then clarified for 60min. The sludge settles in the form of sludge, and the settled sludge is collected by the first collection unit 130, and the primary treatment wastewater is sent to the secondary adjustment tank 210; the concentration of TMT-15 heavy metal ion remover contained in the desulfurization wastewater is 25ppm, and the sulfuric acid contained in the desulfurization wastewater The aluminum concentration is 14ppm, and the polyacrylamide concentration contained in the desulfurization wastewater is 1...

Embodiment 2

[0127] Step S100: Pass 15 t / h of desulfurization wastewater into the primary adjustment tank 110, then add a sodium hydroxide solution with a mass concentration of 15% to the desulfurization wastewater, so that the pH value of the desulfurization wastewater = 9, and at the same time, add TMT to it -15 heavy metal ion remover, aluminum sulfate and polyacrylamide, stirred and reacted for 30min, then the desulfurization wastewater was passed into the primary clarifier 120 and then clarified for 60min, at this time the suspended solids, non-metal ions and heavy metal ions contained in the desulfurization wastewater were all Settling in the form of sludge, the settled sludge is collected by the first collection unit 130, and the primary treatment wastewater is sent to the secondary adjustment tank 210; the concentration of TMT-15 heavy metal ion remover contained in the desulfurization wastewater is 5ppm, and the concentration of the desulfurization wastewater contains The concentra...

Embodiment 3

[0138] Step S100: Pass 15 t / h of desulfurization wastewater into the primary adjustment tank 110, then add sodium hydroxide solution with a mass concentration of 8% to the desulfurization wastewater, so that the pH value of the desulfurization wastewater = 9, and at the same time, add TMT to it -15 heavy metal ion remover, polydimethyldiallyl ammonium chloride and activated silicic acid, stirred and reacted for 30 minutes, then the desulfurization wastewater was passed into the primary clarifier 120 and then clarified for 60 minutes. At this time, the suspended substances, non-metal ions and heavy metal ions all settle in the form of sludge, and the settled sludge is collected by the first collection unit 130, and the primary treatment wastewater is sent to the secondary adjustment tank 210; the TMT-15 heavy metal ions contained in the desulfurization wastewater are removed The concentration of the agent is 50ppm, the concentration of polydimethyldiallylammonium chloride contai...

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Abstract

The invention discloses a desulfurization wastewater treatment method and a system thereof, relates to the technical field of desulfurization, and aims to reduce the amount of sludge generated in thedesulfurization wastewater treatment process and reduce the recovery difficulty of useful substances contained in desulfurization wastewater. The desulfurization wastewater treatment method comprisesthe following steps: removing suspended matters, non-metal ions and heavy metal ions contained in the desulfurization wastewater, precipitating magnesium ions contained in the obtained primary treatment wastewater, precipitating calcium ions contained in the obtained secondary treatment wastewater, treating the obtained tertiary treatment wastewater, recovering the obtained monovalent salt wastewater to obtain a monovalent salt recovery product and a monovalent salt recovery effluent; and recycling divalent salt contained in the divalent salt wastewater. The desulfurization wastewater treatment system applies the desulfurization wastewater treatment method. The desulfurization wastewater treatment method and the system are used for wastewater treatment.

Description

technical field [0001] The invention relates to the technical field of desulfurization, in particular to a desulfurization wastewater treatment method and system. Background technique [0002] Limestone-gypsum wet flue gas desulfurization process is a kind of flue gas desulfurization method with very mature technology and relatively reliable operation. Its raw materials come from a wide range of sources, and the by-products produced can be fully utilized. The existing limestone-gypsum wet flue gas desulfurization equipment needs to regularly discharge a certain amount of desulfurization wastewater during operation to ensure the normal progress of flue gas desulfurization. [0003] However, the desulfurization wastewater discharged from limestone-gypsum wet flue gas desulfurization equipment is acidic, with high salt content, high suspended solids content, heavy metal content, and large fluctuations in water quality. If it is discharged directly, it will seriously affect the...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/18
CPCC02F1/442C02F1/4693C02F1/52C02F1/66C02F9/00C02F2103/18C02F2301/08
Inventor 佟振伟程子洪钟振成段亚威陈权霍卫东熊日华李永龙李晓峰卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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