Method for processing urban sewage nitrifying liquid by sludge fermentation and denitrification coupled with anaerobic ammonia oxidation

Abstract

The invention discloses a method for processing urban sewage nitrifying liquid by sludge fermentation and denitrification coupled with anaerobic ammonia oxidation, and belongs to the technical field of sewage treatment by a biochemical process. Efficient removal of total nitrogen wastewater in the same space is achieved by combined action of hydrolytic acidate bacteria, denitrifying bacteria and anaerobic ammonium oxidation bacteria. The method concretely comprises the steps of restoring NO3-N into NO2-N and N2 by short-chain fatty acid produced by primarily participated sludge in a hydrolysis acidification process in a single reactor; and removing NO2-N accumulated in the denitrification process and ammonia nitrogen released in the hydrolysis acidification process by anaerobic ammonia oxidation reaction. Thus, the total nitrogen concentration of the outlet water is greatly reduced; and minimization of the primarily participated sludge is finished at the same time. Thus, the technology is suitable for deep treatment of nitrifying water of urban sewage.

Description

technical field [0001] The invention relates to a method for treating low-carbon-to-nitrogen ratio urban domestic sewage nitrification effluent by using primary sludge hydrolysis acidification to produce carbon sources to strengthen denitrification and anaerobic ammonium oxidation technology, and belongs to the technical field of biochemical sewage treatment. Through the joint action of hydrolytic acidification bacteria, denitrification bacteria and anammox bacteria, the efficient removal of total nitrogen in wastewater can be realized in the same space. Specifically, in a single reactor, the short-chain fatty acids produced during the hydrolysis and acidification of primary sludge are used to convert NO 3 - -N reverts to NO 2 - -N and N 2 , and through the anaerobic ammonium oxidation reaction, the NO accumulated in the denitrification process 2 - -N and the ammonia nitrogen released during hydrolytic acidification are removed. As a result, the concentration of total n...

AI Technical Summary

Problems solved by technology

[0006] The invention successfully solves the problem of insufficient carbon source in the traditional nitrification and denitrification process. In a single reactor, the short-chain fatty acid produced by the primary sludge in the hydrolysis and acidification process is used to convert NO 3 - -N reverts to NO 2 - -N and N 2 , and synchronously remove the ammonia nitrogen produced in the hydrolytic acidification process through the anaerobic ammonium oxidation reaction, and at the same time complete the initial reduction of the primary sludge

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