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Method for treating desulfurization wastewater by using fly ash

A technology for desulfurization wastewater and fly ash, which is applied in the fields of water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc. It can solve the problem of the lack of effective utilization of fly ash desulfurization wastewater, and shorten the treatment process. , The effect of reducing transportation costs and low prices

Inactive Publication Date: 2010-09-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Retrieval of patents and published literature at home and abroad, there are reports on the use of fly ash as an adsorbent or as a coagulant to remove organic matter in wastewater, decolorization, and treatment of phosphorus-containing wastewater, fluorine-containing wastewater, and chromium-containing wastewater. Most of these technologies only utilize a valuable component in fly ash, such as Al 2 o 3 or CaO, there is no report on the effective use of fly ash to treat desulfurization wastewater in the existing literature

Method used

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  • Method for treating desulfurization wastewater by using fly ash
  • Method for treating desulfurization wastewater by using fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Experiments were carried out on Baosteel's desulfurization wastewater by using fly ash.

[0038] The composition of the fly ash is: SiO 2 : 55.6, Al 2 o 3 : 21.4, Fe 2 o 3 : 8.5, CaO: 7.9, MnO: 0.2, MgO: 1.4, Na 2 O: 0.2, K 2 O: 2.2, SO 3 : 0.4. The concentration of fluoride ions in the wastewater is lower than the national first-level discharge standard, so defluoridation treatment is not required.

[0039] The test process is carried out according to the following steps:

[0040] (1) Discharge the desulfurization wastewater into the regulating tank to balance the water quantity and quality;

[0041] (2) The effluent enters the reaction tank, continues to add fly ash, adjusts the pH to 9.5, and removes various heavy metal ions;

[0042] (3) The effluent enters the sedimentation tank, where the mud and water are separated, the sediment is dehydrated and transported outside, and the supernatant is discharged up to the standard.

[0043] The content of each pol...

Embodiment 2

[0048] Experiments were carried out on Baosteel's desulfurization wastewater by using fly ash.

[0049] The composition of the fly ash is: SiO 2 : 47.6, Al 2 o 3 : 32, Fe 2 o 3 : 11, CaO: 5.3, MnO: 0.2, MgO: 0.95, Na 2 O: 0.4, K 2 O: 1.5, SO 3 : 0.3. The concentration of fluoride ions in the wastewater is lower than the national first-level discharge standard, so defluoridation treatment is not required.

[0050] The test process is carried out according to the following steps:

[0051] (1) Discharge the desulfurization wastewater into the regulating tank to balance the water quantity and quality;

[0052] (2) The effluent enters the reaction tank, continues to add fly ash, adjusts the pH to 9, and removes various heavy metal ions;

[0053] (3) The effluent enters the sedimentation tank, where the mud and water are separated, the sediment is dehydrated and transported outside, and the supernatant is discharged up to the standard.

[0054] The content of each polluti...

Embodiment 3

[0059] Experiments were carried out on Baosteel's desulfurization wastewater by using fly ash.

[0060] The composition of the fly ash is: SiO 2 : 59.3, Al 2 o 3 : 22.5, Fe 2 o 3 : 12.2, CaO: 1.3, MnO: 0.3, MgO: 1.1, Na 2 O: 0.2, K 2 O: 0.8, SO 3 : 0.5.

[0061] The concentration of various pollutants in the wastewater is relatively high, and the content of fluoride ions exceeds the national first-level discharge standard of 10mg / L, so defluoridation needs to be considered during the treatment process.

[0062] The test process is carried out according to the following steps:

[0063] (1) Discharge the desulfurization wastewater into the regulating tank to balance the water quantity and quality;

[0064] (2) Fly ash and desulfurization wastewater undergo a primary neutralization reaction in the reaction tank, and the pH is controlled at 6.8 to effectively remove fluoride ions in the desulfurization wastewater;

[0065] (3) The effluent from the first-stage reaction e...

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Abstract

The invention provides a method for treating desulfurization wastewater by using fly ash. The method comprises the following steps of: (1) wastewater regulation, discharging the desulfurization wastewater into a regulating reservoir for balancing water quantity and water quality; (2) a first stage reaction, performing a neutralization reaction between the fly ash and the desulfurization wastewater in a reaction tank and controlling the pH to be 6.8 to 7.2; (3) primary sedimentation, allowing the effluent water from the first stage reaction to enter a primary sedimentation tank, performing sludge-water separation in the sedimentation tank, externally transporting dehydrated sediments and allowing supernatant liquid to enter a next stage reaction; (4) a second stage reaction, allowing the effluent water from the primary sedimentation to enter a secondary reaction tank, continuously adding the fly ash, regulating the pH to be 9 to 9.5 according to the actual requirements and removing various heavy metal ions; and (5) secondary sedimentation, allowing the effluent water from the second stage reaction to enter a secondary sedimentation tank, performing sludge-water separation in the sedimentation tank, externally transporting dehydrated sediments and discharging or using the supernatant liquid meeting the required standard for other purposes. The method for treating the desulfurization wastewater by using the fly ash has the advantage of reduction in the treating flow and the cost.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for treating desulfurization waste water with fly ash. Background technique [0002] With the rapid development of my country's energy industry and the construction of large-scale coal-fired power plants and steel plants, fuel consumption continues to increase, SO 2 The amount of emissions is increasing, and the resulting air pollution is also becoming more and more serious. It is imminent to take desulfurization measures. At present, flue gas desulfurization is considered to control SO 2 The most proven method for emissions. Limestone-gypsum wet flue gas desulfurization is the most widely used and most mature desulfurization process in the world. This wet flue gas desulfurization process will produce some wastewater, that is, desulfurization wastewater, whose pH is generally between 3 and 6, and contains a large amount of suspended matter (gypsum particles, SiO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/62C02F103/18
Inventor 侯红娟沈晓林李恩超黎洁郑炜
Owner BAOSHAN IRON & STEEL CO LTD