Efficient municipal sewage denitrification technology taking nitrosation-anaerobic ammonia oxidation as core

Abstract

The invention relates to an efficient municipal sewage denitrification technology taking nitrosation-anaerobic ammonia oxidation as a core. The technology comprises the following steps: S1, carrying out pre-treatment on sewage by adopting a biochemical flocculation technology unit to remove almost organic matters, SS (Suspended Substance) and TP (Total Phosphorus) in the sewage, reducing a carbon-nitrogen ratio, controlling the OHO total amount in a system and realizing separation of the sewage and sludge; S2, carrying out sterilization treatment on the sewage which is discharged through the pre-treatment through an ozone disinfection technology unit; synchronously treating the sludge which is discharged through the pre-treatment through a sludge anaerobic digestion unit; S3, treating sewage subjected to the sterilization treatment through a nitrosation technology unit, and converting part of ammonia nitrogen in the sewage into nitrite nitrogen; S4, carrying out tail-end denitrification treatment on wastewater, which is treated through the nitrosation technology unit, through an anaerobic ammonia oxidation technology unit so as to enable TN (Total Nitrogen) of output water can stably reach first-grade A standards. The efficient municipal sewage denitrification technology provided by the invention has the advantages of good water quality of the output water, easiness for controlling operation, stability and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, relates to urban sewage treatment technology, in particular to a high-efficiency denitrification process of urban sewage with nitritation-anammox as the core. Background technique [0002] Anaerobic ammonium oxidation (Anammox) is a process that uses anaerobic ammonium oxidation bacteria (AAOB) to simultaneously convert ammonia nitrogen and nitrite nitrogen in wastewater into nitrogen gas under anoxic or anaerobic conditions. Since ammonium oxidation bacteria (AOB) can oxidize ammonia into nitrite and provide a substrate for AAOB, the current anammox process is usually coupled with the nitrosation (semi-short-range nitrification) process. [0003] The functional microorganism AAOB that performs the anaerobic ammonium oxidation process grows slowly, the cell yield is low, and is easily affected by environmental conditions, so AAOB is often at a disadvantage in competition with ...

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Problems solved by technology

[0006] At present, the population dominance of AOB and AAOB is generally guaranteed by controlling SRT, HRT, DO, and anoxic / aerobic operation modes while inhibiting the growth of other miscellaneous bacteria such as NOB and Ordinary Heterotrophic Organism (OHO). It is very difficult. Improper control when the water quality fluctuates is likely to cause the system to collapse. Once it collapses, it is difficult to recover. Therefore, when the control methods are average, the anammox technology is difficult to achieve.

In addition, NOB has a stronger affinity for nitrogen substrates than AOB, so the concentration of ammonia nitrogen in the effluent is usually maintained above 5mg / L. Therefore, it is difficult to obtain a very low concentration of ammonia nitrogen in the effluent if there is no subsequent further treatment in the ordinary anaerobic ammonium oxidation process.

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