Method for strengthening autotrophic denitrification effect of urban sewage by using oxidation ditch

Abstract

The invention relates to a method for strengthening the autotrophic denitrification effect of urban sewage by adopting an oxidation ditch and belongs to the field of sewage treatment. The method comprises the following steps of: feeding the urban sewage into an aerobic zone of a high-load activated-sludge reactor so as to be subjected to anaerobic phosphorus release, feeding the urban sewage into an aerobic zone, adsorbing organic matters in the urban sewage onto activated sludge under the adsorbing action of the activated sludge, removing the phosphorus in the urban sewage by the way of aerobic phosphorus adsorbing, feeding the urban sewage in which the organic matters and the phosphorus are removed into the oxidation ditch, carrying out short-time nitrification and anaerobic ammonium oxidation to the urban sewage in a hypoxic zone, carrying out anaerobic ammonium oxidation to the urban sewage in an anoxic zone, and carrying out autotrophic nitrogen removal to the urban sewage by carrying out short-time nitrification and short-time anaerobic ammonium oxidation in the hypoxic zone and the anoxic zone repeatedly. By utilizing the method, the organic matters in the sewage can be enriched into the sludge in the process of removing the phosphorus biologically, the sludge can be used for the anaerobic methanogenesis, and the energy in the sludge can be recovered. In addition, the autotrophic nitrogen removal is realized by carrying out nitrification and anaerobic ammonium oxidation in the hypoxic zone and the anoxic zone repeatedly, and the energy consumed for treating the sewage can be reduced greatly.

Description

technical field [0001] The invention relates to a method for strengthening the autotrophic denitrification process of urban sewage oxidation ditch, which belongs to the technical field of sewage biological treatment. Background technique [0002] Oxidation ditch process sludge has a long residence time, which is conducive to the growth of nitrifying bacteria, so the nitrification effect of oxidation ditch process can generally be guaranteed. When the sludge age in the oxidation ditch system is long, the amount of residual sludge discharge is small, which will affect the biological phosphorus removal effect of the system. Especially when the carbon-nitrogen ratio of urban sewage is low, denitrification denitrification and anaerobic phosphorus release compete for carbon sources, making it difficult to guarantee the effect of nitrogen and phosphorus removal in the oxidation ditch system. [0003] After the discovery of anammox bacteria, autotrophic denitrification of sewage be...

AI Technical Summary

Problems solved by technology

When the sludge age in the oxidation ditch system is long, the amount of residual sludge discharge is small, which will affect the biological phosphorus removal effect of the system

Especially when the carbon and nitrogen ratio of urban sewage is low, denitrification denitrification and anaerobic phosphorus release compete for carbon sources, making it difficult to guarantee the effect of nitrogen and phosphorus removal in the oxidation ditch system

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