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Desulfurization wastewater treatment system and method

A technology for desulfurization wastewater and treatment system, which is applied in gaseous effluent wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. The effect of cost reduction, lower processing cost, strong adaptability

Inactive Publication Date: 2021-08-20
YICHANG JIUTIAN ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic treatment of desulfurization wastewater generally adopts the conventional chemical precipitation technology, that is, the "neutralization-precipitation-flocculation" triple box technology, but this treatment process requires high process control and cannot remove COD, ammonia nitrogen, and Cl in the wastewater. - , SO 4 2- The removal effect is very limited, affecting the recycling of desulfurization wastewater after treatment
In order to meet the reuse standard of desulfurization wastewater and realize zero discharge of desulfurization wastewater, a new technology of membrane concentration and reduction is now used, but the disadvantage is that there is complex regeneration of extract solution, complex system, high investment cost, and desulfurization wastewater concentrated by reverse osmosis or forward osmosis technology. , still needs to be evaporated and solidified. Although the reuse of desulfurization wastewater has been solved and zero discharge of desulfurization wastewater has been realized, there are problems of high investment costs and high post-treatment costs.

Method used

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  • Desulfurization wastewater treatment system and method

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Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 desulfurization wastewater treatment

[0055] 1) Add calcium hydroxide to adjust the pH to 9.5 while aerating industrial desulfurization wastewater (chloride ion content is less than 2000-2500mg / L) in the calcium hydroxide dosing tank, and remove sulfate, fluoride, and some Fe 2+ , Fe 3+ , Pb 2+ 、Cu 2+ 、Cr 3+ After heavy metals form hydroxides and precipitate, calcium ions and sulfate ions form calcium sulfate precipitation, the excess calcium hydroxide can be removed by aeration to form calcium carbonate precipitation;

[0056] 2) Add sodium hydroxide to the wastewater treated in step 1) to adjust the pH to 11, and use ultrasonic aeration to remove COD, ammonia nitrogen and Mg in the wastewater 2+ , the total power of ultrasonic is 1000±50VA, and the working frequency is 20±2kHZ;

[0057] 3) adding sodium carbonate to the waste water treated in step 2) in the sodium carbonate pool to remove calcium hardness, and remove a small amount of magnesium ion...

Embodiment 2

[0062] Embodiment 2 desulfurization wastewater treatment

[0063] 1) Aerate the industrial desulfurization wastewater (chloride ion 2000-2500mg / L) in the calcium hydroxide dosing tank while adding calcium hydroxide to adjust the pH to 10 to remove sulfate, fluoride and some Fe in the wastewater 2+ , Fe 3+ , Pb 2+ 、Cu 2+ 、Cr 3+ After heavy metals form hydroxides and precipitate, calcium ions and sulfate ions form calcium sulfate precipitation, the excess calcium hydroxide can be removed by aeration to form calcium carbonate precipitation;

[0064] 2) Add sodium hydroxide to the wastewater treated in step 1) to adjust the pH to 10, and use ultrasonic aeration to remove COD, ammonia nitrogen and Mg in the wastewater 2+ , the total power of ultrasonic is 1000±50VA, and the working frequency is 20±2kHZ;

[0065] 3) adding sodium carbonate to the waste water treated in step 2) in the sodium carbonate pool to remove calcium hardness, and remove a small amount of magnesium ions w...

Embodiment 3

[0070] Embodiment 3 desulfurization wastewater treatment

[0071] 1) Add calcium hydroxide to adjust the pH to 9 while aerating the industrial desulfurization wastewater (chloride ion 2000-2500mg / L) in the calcium hydroxide dosing tank, and remove sulfate, fluoride, and some Fe in the wastewater 2+ , Fe 3+ , Pb 2+ 、Cu 2+ 、Cr 3+ After heavy metals form hydroxides and precipitate, calcium ions and sulfate ions form calcium sulfate precipitation, the excess calcium hydroxide can be removed by aeration to form calcium carbonate precipitation;

[0072] 2) Add sodium hydroxide to the wastewater treated in step 1) to adjust the pH to 11.5, and use ultrasonic aeration to remove COD, ammonia nitrogen and Mg in the wastewater 2+ , the total power of ultrasonic is 1000±50VA, and the working frequency is 20±2kHZ;

[0073] 3) adding sodium carbonate to the waste water treated in step 2) in the sodium carbonate pool to remove calcium hardness, and remove a small amount of magnesium ion...

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Abstract

The invention provides a desulfurization wastewater treatment system and method. The desulfurization wastewater is treated by adopting aeration, ultrasonic wave, electric flocculation and non-water-soluble polymer chloride ion removal special resin technologies, organic sulfur is not required to be added to remove heavy metals, and two flocculants, namely PAC and PAM, are not required to be added, so that secondary pollution caused by the organic sulfur, the polymer flocculant and the like is reduced, and the treatment cost of chemical treatment of the desulfurization wastewater is reduced.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater, in particular to a desulfurization wastewater treatment system and method. Background technique [0002] Desulfurization wastewater is characterized by a high content of suspended solids, generally between 10,000 and 15,000 mg / L, and its main components include ash, inert substances, and flocculated sediments. Its salt content is high, and the total dissolved solids (TDS) is generally between 25,000 and 60,000 mg / L. The anion and cation with the highest content are respectively Cl - and Mg 2+ , other anions including Ca 2+ , SO 4 2- , F - Plasma, and contains harmful heavy metal ions. [0003] At present, the domestic treatment of desulfurization wastewater generally adopts the conventional chemical precipitation technology, that is, the "neutralization-precipitation-flocculation" triple box technology, but this treatment process requires high process control and cannot remove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01C1/16C01F11/22C02F101/12C02F101/14C02F101/20C02F101/22C02F103/18
CPCC02F9/00C01C1/164C01F11/22C02F2103/18C02F1/42C02F1/463C02F1/66C02F1/002C02F1/283C02F2101/14C02F2101/12C02F2101/20C02F2101/203C02F2101/22C02F7/00C02F1/36
Inventor 郭光玉庄宪军金勇李志斌
Owner YICHANG JIUTIAN ENVIRONMENTAL SCI & TECH