Treatment method for improving removal rate of benzo (a) pyrene in coking wastewater

A technology for coking wastewater and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, flotation water/sewage treatment, etc., can solve problems such as high energy consumption, limited scale application, and high engineering application cost. Achieve the effect of high removal efficiency and meet the discharge requirements of sewage treatment

Inactive Publication Date: 2013-09-18
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

The method for COD Cr , ammonia nitrogen and benzo(a)pyrene removal rates reached 99.5%, 99.9% and 97.2% respectively, but in order to obtain a better catalytic effect, th...

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  • Treatment method for improving removal rate of benzo (a) pyrene in coking wastewater
  • Treatment method for improving removal rate of benzo (a) pyrene in coking wastewater

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Embodiment Construction

[0021] The content of benzo(a)pyrene in the coking wastewater of a coking plant in Baotou City is determined to be 0.0008~0.0010mg / L. After the process described in the present invention, the content of benzo(a)pyrene in the effluent is 0.00001~0.00002mg / L, which satisfies Discharge requirements specified in "Integrated Wastewater Discharge Standard" (GB8978-1996).

[0022] The waste water enters the grease trap and stays in the grease trap for 5-15 minutes. The removal effect of benzo(a) pyrene is not obvious; the effluent from the grease trap enters the air flotation separation reactor. a) The pyrene content is 0.0005~0.0007mg / L; the effluent of the air flotation separation reactor enters A 2 / O biochemical treatment unit, the content of benzo(a)pyrene in the biochemical effluent is 0.0001~0.0002mg / L; the effluent of biochemical treatment enters the coagulation sedimentation tank, after coagulation and precipitation, the content of benzo(a)pyrene in the effluent is 0.00003~0.000...

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Abstract

The invention relates to a treatment method for improving removal rate of benzo (a) pyrene in coking wastewater. The method is characterized by comprising the following steps of: (1) conveying the coking wastewater into an oil separation tank, and removing suspension oil in water; (2) conveying the wastewater from the oil separation tank into an air floatation reactor, adding a coagulant, a coagulant aid and a demulsifier into the air floatation separation reactor; (3) conveying the effluent of the air floatation separation reactor into an A2/O biological treatment process; (4) conveying the effluent of the biological treatment process into a coagulation sedimentation basin, adding the coagulant and the coagulant aid into the coagulation sedimentation basin; (5) conveying the effluent of the coagulation sedimentation basin into an active carbon filtering basin. The method has the advantages that the air floatation and turbidity removal procedures are strengthened based on the distribution characteristics of the benzo (a) pyrene which mostly forms solid suspension or is dissolved in oil, removal of benzo (a) pyrene in coking wastewater is efficient, and the increasingly stringent wastewater treatment and discharge requirements are met.

Description

Technical field [0001] The invention belongs to the field of coking wastewater treatment, and relates to a treatment method for improving the removal rate of benzo(a)pyrene in coking wastewater. Background technique [0002] Coking wastewater is a kind of high-concentration industrial wastewater with complex water quality components, containing dozens of inorganic and organic compounds, including ammonia nitrogen, thiocyanide, phenol, aniline, benzo(a)pyrene (BaP), etc., among which benzo(a) ) Pyrene is a class of organic compounds with obvious carcinogenic effects on the human body determined by the International Cancer Institute. Benzo(a)pyrene is an organic compound with obvious carcinogenic effects on humans. Increasing its removal rate can reduce the potential dangers of coking drainage to drinking water sources and groundwater. (The concentration of benzo(a)pyrene in the drinking water standard is less than 10ng / L). [0003] Benzo(a)pyrene has extremely low solubility at ro...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/24C02F1/56C02F101/32
Inventor 田颖王雨巴雅尔常瑞卿刘翠萍
Owner INNER MONGOLIA BAOTOU STEEL UNION
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