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Desulfurization wastewater treatment process and desulfurization wastewater treatment system

A desulfurization wastewater treatment method technology, applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of high cost of chemicals, complicated operation, long process flow, etc., to achieve energy saving, The effect of reducing the amount of dosing and avoiding pollution

Inactive Publication Date: 2020-05-19
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it follows that the process flow is long, the operation is complicated, and the most important thing is that the cost of the medicament is high during the operation.

Method used

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  • Desulfurization wastewater treatment process and desulfurization wastewater treatment system
  • Desulfurization wastewater treatment process and desulfurization wastewater treatment system
  • Desulfurization wastewater treatment process and desulfurization wastewater treatment system

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Embodiment approach

[0070] According to one embodiment, the pH of the desulfurization wastewater is 4-6.5, the TDS value is 20000-40000 mg / L, the conductivity is 20-35 mS / cm, the calcium ion content is 400-6000 mg / L, and the magnesium ion content is 500 mg / L. -5000mg / L, the sodium ion content is 200-5000mg / L, the chloride ion content is 5000-20000mg / L, the sulfate ion content is 500-15000mg / L, the turbidity is 4000-15000NTU, and the alkalinity is 0.2-50mg / L L, the content of ammonia nitrogen is 10-200mg / L.

[0071] In the treatment method of the present invention, in step (1), the acid is preferably sulfuric acid, and the pH of the neutral softened and clarified effluent is 6-8, more preferably 7-8. In this step, sulfuric acid is added to the softened and clarified water to adjust the pH to neutral, and the added sulfate ions will react with calcium ions in the water to form a small amount of calcium sulfate crystals, which is beneficial to the subsequent reaction in the normal temperature crysta...

Embodiment 1

[0136] This embodiment combines figure 1 To illustrate the treatment method of desulfurization wastewater.

[0137] (1) In the primary neutralization reaction tank, add the sodium hydroxide aqueous solution obtained in step (6) to the desulfurization wastewater of the 20t / h power plant to react, adjust the pH of the wastewater to 7.8, and add 20mg / L organic sulfur TMT-15 , 10mg / L flocculant and 5mg / L coagulant, reacted for 60min, and the resulting reaction product was transported to the primary clarifier and settled for 120min to obtain the primary clarified effluent;

[0138] Send the primary clarified effluent to the secondary neutralization reaction tank, continue to add the aqueous sodium hydroxide solution obtained in step (6) therein, adjust the pH of the effluent to be 11.5, and add 5mg / L coagulant aid, react for 70min, and obtain The reaction product was transported to the secondary clarifier and settled for 120 minutes to obtain the magnesium hydroxide product (purit...

Embodiment 2

[0151] This embodiment combines figure 2 To illustrate the treatment method of desulfurization wastewater.

[0152] (1) In the primary neutralization reaction tank, add the sodium hydroxide aqueous solution obtained in step (6) to the desulfurization wastewater of the 20t / h power plant to react, adjust the pH of the wastewater to 7.2, and add 30mg / L organic sulfur TMT-15 , 8mg / L flocculant and 5mg / L coagulant, reacted for 60min, and the reaction product obtained was transported to the primary clarification tank and settled for 130min to obtain the primary clarified effluent;

[0153] Send the primary clarified effluent to the secondary neutralization reaction tank, continue to add the aqueous sodium hydroxide solution obtained in step (6) therein, adjust the pH of the effluent to be 11.6, and add 5mg / L coagulant aid, react for 60min, and obtain The reaction product was transported to the second clarifier and settled for 120 minutes to obtain a magnesium hydroxide product (98...

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Abstract

The invention relates to the field of desulfurization wastewater treatment, and discloses a desulfurization wastewater treatment method and a desulfurization wastewater treatment treatment system. Thetreatment method comprises: (1) in the presence of sodium hydroxide, carrying out softening clarification treatment on desulfurization wastewater to obtain softened clarified effluent; (2) adding sodium sulfate into the neutral softened clarified effluent, and carrying out normal-temperature crystallization to obtain normal-temperature crystallized effluent; (3) adding sodium carbonate into the normal-temperature crystallized effluent to obtain hardness regulation effluent and calcium carbonate; (4) carrying out nanofiltration separation treatment on the hardness regulation effluent; (5) carrying out electrodialysis-reverse osmosis coupled concentration treatment on the nanofiltration produced water; and (6) carrying out diaphragm electrolysis on the membrane concentration concentrated water. The treatment method provided by the invention can fully protect the operation of the membrane system, can avoid the addition of additional alkaline agents, and realizes the effective coupling ofself-sufficiency in the system and the whole treatment process.

Description

technical field [0001] The invention relates to the field of desulfurization wastewater treatment, in particular to a treatment method and system for desulfurization wastewater. Background technique [0002] Limestone-gypsum wet flue gas desulfurization process is widely used at home and abroad. This process is a large-scale commercial application of desulfurization method in the world. The technology is very mature, the operation is relatively reliable, and the desulfurization efficiency is high. Good adaptability. During the desulfurization process, a certain amount of waste water must be discharged regularly, one is to maintain the balance of substances in the slurry circulation system of the desulfurization device, and the other is to prevent the chlorine concentration in the flue gas from exceeding the specified value and ensure the quality of gypsum. Wastewater mainly comes from flushing water system and gypsum dehydration, etc. Desulfurization wastewater is generally...

Claims

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Application Information

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IPC IPC(8): C02F9/06C01F11/46C01F11/18C01F5/22C25B1/26C02F103/18
CPCC01F5/22C01F11/18C01F11/46C02F1/42C02F1/441C02F1/442C02F1/4693C02F1/66C02F5/02C02F5/08C02F9/00C02F2103/18C02F2209/05C02F2209/055C02F2303/22C25B1/26
Inventor 钟振成熊日华程子洪陈权佟振伟段亚威于双恩卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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