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Treating method and treating apparatus for alkali residue wastewater

A technology of alkali slag waste liquid and treatment method, which is applied in the direction of precipitation treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve the problem of affecting the quality of sodium sulfate crystallization salt, reducing the salt content of neutralization water, and unsatisfactory discharge Requirements and other issues to achieve good environmental and economic benefits, improve quality, and reduce the use of chemicals

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device can efficiently remove high-concentration sulfide, phenol and other petroleum acids in the alkali slag waste liquid, and reduce the salt content of the neutralized water. However, it is necessary to adjust the pH of the acidified wastewater to 6-8 before entering the evaporation and crystallization unit. A large amount of lye is consumed, and part of the phenol in the waste liquid will exist in the form of sodium phenate after adjustment, which will affect the quality of sodium sulfate crystallization and crystalline salt; while a small amount of organic matter such as phenol in the waste liquid enters the steam during evaporation, which will cause Cavitation and corrosion of subsequent vapor compressors
In addition, the neutralized water does not meet the discharge requirements after desalination, and needs to be sent to the biochemical treatment pool for further treatment

Method used

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  • Treating method and treating apparatus for alkali residue wastewater

Examples

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Embodiment 1

[0047] A company's catalytic gasoline alkali residue and liquid hydrocarbon alkali residue mixed alkali residue waste liquid, of which COD is 3.21×10 5 mg / L, sulfide is 1.99×10 4 mg / L, volatile phenol is 1.07×10 5 mg / L.

[0048] Using the present invention figure 1 The device shown is for treatment, the acidification reaction settler is equipped with pH monitoring, the pH of the acidification wastewater in the acidification reaction settler is controlled to be 2, and nitrogen is used as the carrier gas. Acidification of the alkali residue waste liquid with sulfuric acid can remove petroleum acids such as sulfide and phenol in the alkali residue waste liquid, and reduce the COD of the waste liquid. The upper oil phase after acidification and sedimentation enters the oil phase storage tank, and then uses oil phase refining equipment for refining treatment to recover petroleum acids such as phenol. The acidified tail gas discharged from the acidification reaction settler and ...

Embodiment 2

[0051] A company's catalytic gasoline alkali residue, catalytic diesel oil and liquid hydrocarbon alkali residue mixed alkali residue waste liquid, of which COD is 2.35×10 5 mg / L, sulfide is 3.68×10 4 mg / L, volatile phenol is 5.89×10 4 mg / L.

[0052] Using the present invention figure 1The device shown is for treatment, the acidification reaction settler is equipped with pH monitoring, the pH of the acidification wastewater in the acidification reaction settler is controlled to be 4, and nitrogen is used as the carrier gas. Acidification of the alkali residue waste liquid with sulfuric acid can remove petroleum acids such as sulfide and phenol in the alkali residue waste liquid, and reduce the COD of the waste liquid. The upper oil phase after acidification and sedimentation enters the oil phase storage tank, and then uses oil phase refining equipment for refining treatment to recover petroleum acids such as phenol. The acidified tail gas discharged from the acidification ...

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Abstract

The invention relates to a treating method for alkali residue wastewater. The treating method comprises the following steps: (1) acidifying alkali residue wastewater with sulfuric acid, introducing inert gas and stopping acidifying when a pH value reaches 2 to 6; (2) allowing acidification tail gas to enter a tail gas treating unit so as to recover sulfide; (3) subjecting acidification waste liquid to settlement so as to recover an oil phase; and (4) subjecting the acidified wastewater in which the oil phase is recovered to single-stage continuous evaporative crystallization, carrying out catalytic oxidation on secondary steam produced in evaporation, recycling purified steam, and subjecting produced crystallized slurry to centrifugation so as to obtain sodium sulfate. The treating methodrealizes high-efficiency treatment of high-concentration sulfide and COD in alkaline residues, recovers useful substances in the alkali residue wastewater, allows acidification tail gas to be discharged after reaching the standard, reduces the usage amount of chemicals during treatment, and improves the quality of sodium sulfate crystalline salt; and produced condensed water can be discharged after reaching the standard or recycled.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a treatment method and device for alkali slag waste liquid, which is suitable for the treatment of oil refining alkali slag waste liquid, petrochemical alkali slag waste liquid containing sodium sulfide, and organic acid salt waste liquid Comprehensive processing. Background technique [0002] During the alkali refining process of oil products in refineries, alkaline waste liquid containing high concentration of pollutants will be produced, and the emissions of COD, sulfides and phenols account for a large proportion of such pollutants in refineries. Pressed diesel soda residue, catalytic gasoline soda residue, catalytic diesel soda residue, liquid hydrocarbon soda residue, etc. If the alkali residue waste liquid is discharged directly, it will seriously pollute the environment; if it is sent to the sewage treatment plant, it wil...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/40C02F1/66C02F9/00C02F2001/007
Inventor 赵磊刘志禹刘忠生王筱喃王新
Owner CHINA PETROLEUM & CHEM CORP