Urban sewage oxidation treatment technology
The invention discloses an urban sewage oxidation treatment technology which comprises the following steps of: incoming water, coarse-screen filtration, fine-screen filtration, sedimentation in a grit chamber, sedimentation in a primary sedimentation tank, oxidation treatment in an A2/C oxidation di...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention discloses an urban sewage oxidation treatment technology which comprises the following steps of: incoming water, coarse-screen filtration, fine-screen filtration, sedimentation in a grit chamber, sedimentation in a primary sedimentation tank, oxidation treatment in an A2/C oxidation ditch, secondary sedimentation treatment, disinfection treatment and effluent, wherein the oxidation ditch in the oxidation treatment in an A2/C oxidation ditch comprises an anaerobic zone, anoxic zone and an oxidation ditch zone; the phosphorus absorption staying time in the anoxic zone is 30-55min; the mixed liquid staying time in the anaerobic zone is 1-1.8h; an underwater stirrer is arranged in the anaerobic zone; and a surface aerator is arranged in the oxidation ditch. By adopting the oxidation treatment technology disclosed by the invention, the outer reflux ratio and the maximum mixed-liquid reflux ratio can be increased so as to improve the phosphorous removal and nitrate return efficiency and quality.
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