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
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[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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