Device and method for realizing high-efficiency and low-consumption nitrogen and phosphorous removal of municipal sewage

Abstract

The invention discloses a device and method for realizing high-efficiency and low-consumption nitrogen and phosphorous removal of municipal sewage and belongs to the field of biological treatment of sewage and sludge. Sewage in a raw water tank sequentially enters an anaerobic zone and an aerobic zone of a reactor for enhanced biological phosphorus removal and whole-process nitrification through awater feeding pump; anaerobic phosphorus release is performed in the anaerobic zone; whole-process nitrification and aerobic phosphorus absorption effects are carried out in the aerobic zone; subsequently, the sewage is drained into a settling pond, supernate enters a reactor for fermentation coupling, short-cut denitrification and synchronous anaerobic ammonium oxidation of excess sludge. The excess sludge is quantitatively fed into the reactor for fermentation coupling, short-cut denitrification and synchronous anaerobic ammonium oxidation of the excess sludge each day; short-cut denitrifying bacteria transform nitric nitrogen into nitrite nitrogen by using organic matters produced by hydrolysis and fermentation of the sludge; anaerobic ammonium oxidizing bacteria transform excess ammonia nitrogen and nitric nitrogen into nitrogen. According to the device and the method disclosed by the invention, deep nitrogen and phosphorus removal of the municipal sewage is realized by using an enhanced biological phosphorus removal process, a short-cut denitrification process and an anaerobic ammonium oxidation process; moreover, sludge reduction is realized by the hydrolysis and fermentation effects of the sludge, so that energy conservation and consumption reduction are realized.

Description

technical field [0001] The invention relates to a device and method for treating urban sewage based on nitrification, short-range denitrification-anammox-sludge fermentation process, and belongs to the field of biological treatment of sewage sludge. It is suitable for the design and application of new sewage treatment plants, the upgrading and transformation of existing sewage treatment plants, the deep denitrification and phosphorus removal of urban sewage and industrial wastewater with low carbon-to-nitrogen ratio, and sludge reduction. Background technique [0002] In order to further control water environmental pollution and accelerate the realization of sewage resources, my country has gradually raised the discharge standards of urban sewage treatment plants. In the "Discharge Standards of Pollutants for Urban Sewage Treatment Plants" (GB18918-2002), the first-class A discharge standard stipulates that the effluent COD≤50mg / L, NH 4 + -N≤5mg / L, TN≤15mg / L, TP≤0.5mg / L. ...

AI Technical Summary

Problems solved by technology

However, only relying on denitrification to consume the organic acids produced by sludge fermentation will not eliminate the ammonia nitrogen produced by sludge fermentation

At the same time, the carbon source extraction technology in sludge fermentation is generally a fermentation-elutriation process. In practical applications, it is difficult to separate mud and water, volatile fatty acids produced by fermentation are difficult to be elutriated, and it is difficult to avoid methane-producing reactions. question

Images