Regeneration method for urban sewage by continuous flow

Abstract

The invention belongs to the technical field of water environment restoration and particularly relates to a regeneration method for urban sewage by continuous flow. In view of the problems existing in a conventional simultaneous nitrogen and phosphorus removal process of serious shortage of carbon sources due to competition for carbon sources in nitrogen and phosphorus removal, big differences in sludge ages of a denitrifier and phosphorus removal bacteria and demand for dissolved oxygen, insufficient alkalinity of sewage, difficulty in giving consideration to nitrogen and phosphorus removal effects concurrently and the like, through overall planning from the process flow and optimization of tasks of all processing units, the regeneration method can be used for removing phosphorus and organic matters by an anaerobic-aerobic process, partially oxidizing ammonia and nitrogen into nitrite nitrogen by a multistage completely hybrid nitrosation process, and realizing autotrophic denitrification by using an upward-flow anaerobic ammonia oxidation biofilter so as to achieve high-efficient low-carbon treatment and regeneration of the sewage, with effluent COD less than 45 mg / L, BOD less than 10 mg / L, TP less than 0.4 mg / L, and TN less than 10 mg / L, so that the treated sewage can reach the national primary standard A.

Description

technical field [0001] The invention belongs to the technical field of water environment restoration, and in particular relates to a continuous flow urban domestic sewage regeneration method. Background technique [0002] Up-to-standard discharge of sewage treatment is an important means to alleviate the crisis of water environment. The state promulgated the "Pollutant Discharge Standards for Urban Sewage Treatment Plants", requiring the effluent to reach Grade A, in which COD is less than 50mg / L, BOD is less than 10mg / L, TN is less than 15mg / L, and TP is less than 0.5mg / L. For nutrients control is particularly strict. Most of the processes currently used in my country's sewage treatment plants are based on the traditional theory of nitrogen and phosphorus removal, which has inherent shortcomings, and it is difficult to achieve Class A standard treatment and discharge. [0003] First of all, domestic sewage is sewage with a low carbon-to-nitrogen ratio. For denitrification...

AI Technical Summary

Problems solved by technology

With the nitrosation process realized by CSTR, the ratio of nitrite nitrogen to ammonia nitrogen in the effluent can only reach about 1, not 1.31, which cannot meet the needs of anaerobic ammonium oxidation, and long-term operation is easy to turn to full-process nitrification, losing the effect of nitrosation

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