Biochemical treatment method and device for benzo (a) pyrene in coking wastewater

A technology for coking wastewater and biochemical treatment, applied in biological treatment devices, water/sewage treatment, water treatment parameter control, etc., can solve problems such as difficult to treat industrial wastewater, achieve good biological population diversity, good effluent quality, tolerance impact effect

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes an improved method called Membranes Biology (MBBR), specifically used in wastewater purification processes that uses microorganisms or enzyme systems to break down harmful substance residues from contaminated water streams. These methods have been shown effective at removing various types of chemical compounds like pesticides and other unwanted materials while also maintaining their beneficial properties over time. Overall, this new approach provides better control over environmental issues caused by these compound levels.

Problems solved by technology

This technical problem addressed in this patents relates to improving the efficiency and purity of processing coked wastewaters without harmful effects or negative side impacts onto humans' physical wellbeings due to their highly complex molecular structures. Current techniques involve expensive processes like precipitation, filtration, oxidative decomposition, solvent extraction, distillation, ion exchange resins, adhesion preventive agents, coagulation, electrosynthesis, etc., while others focuses only on removing specific types of organics called BAPHQz.

Method used

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  • Biochemical treatment method and device for benzo (a) pyrene in coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Example 1: In a refinery plant, the concentration of benzo(a)pyrene in the outlet of the coking device is 60 μg / L and the COD is 600 mg / L, in order to meet the requirement that the concentration of benzo(a)pyrene at the outlet of the device is less than 0.03 μg / L , using the biochemical process of the present invention for treatment, the final effluent concentration of benzo (a) pyrene is 0.03 μg / L, and the COD effluent concentration is 50 mg / L.

[0088] The process flow is:

[0089] (1) after the coking wastewater is homogenized in the homogenization tank 1, it is sent to the oil separator 3 by the homogenization tank lift pump 2, and the tar in the wastewater is separated and removed, and the scum is discharged;

[0090] (2) The effluent from the grease trap 3 is sent to the coagulation sedimentation tank 8, and is mixed with the coagulation agent under the action of the stirring paddle, and the flocculent precipitation is discharged from the mud discharge port

Embodiment 2

[0100] Example 2: In a refinery plant, the concentration of benzo(a)pyrene in the outlet of the coking device is 40 μg / L and the COD is 500 mg / L, in order to meet the requirement that the concentration of benzo(a)pyrene at the outlet of the device is less than 0.03 μg / L , using the biochemical process of the present invention for treatment, the final effluent concentration of benzo (a) pyrene is 0.03 μg / L, and the COD effluent concentration is 40 mg / L.

[0101] The process flow is:

[0102] (1) after the coking wastewater is homogenized in the homogenization tank 1, it is sent to the oil separator 3 by the homogenization tank lift pump 2, and the tar in the wastewater is separated and removed, and the scum is discharged;

[0103] (2) The effluent from the grease trap 3 is sent to the coagulation sedimentation tank 8, and is mixed with the coagulation agent under the action of the stirring paddle, and the flocculent precipitation is discharged from the mud discharge port

Embodiment 3

[0113] Example 3: Take a certain industrial wastewater with benzo(a)pyrene concentration of 60 μg / L and COD of 600 mg / L. The difference from Example 1 is that 22% of the activated sludge after the reaction is returned to the front section of the coagulation tank, the benzo(a)pyrene energy in the treated water is reduced from 60 μg / L to 0.02 μg / L, and the COD is reduced from 600 mg / L down to 40mg / L.

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Abstract

The invention discloses a biochemical treatment method and device for benzo (a) pyrene in coking wastewater. The method comprises the following steps: S1, introducing coking wastewater into a homogeneous regulation device for homogeneous regulation to obtain first effluent; s2, the first effluent obtained in S1 is introduced into an oil separation device for oil separation treatment, and second effluent is obtained; s3, introducing the second effluent obtained in S2 into a coagulating sedimentation device for coagulating sedimentation treatment to obtain third effluent subjected to coagulating sedimentation treatment; s4, the third effluent obtained in S3 is introduced into a filtering device for filtering treatment, and fourth effluent obtained after filtering treatment is obtained; s5, introducing the fourth effluent obtained in S4 into an MBR (Membrane Bioreactor) for biochemical reaction to obtain fifth effluent and reacted activated sludge; and S6, introducing the fifth effluent obtained in the step S5 into an adsorption device for adsorption treatment. The device is high in activated sludge concentration, simplified in structure and small in occupied area, and the production and manufacturing cost and the use and operation cost of the benzo (a) pyrene-containing sewage treatment device can be reduced.

Description

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Claims

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Application Information

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Owner CHINA PETROLEUM & CHEM CORP
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