Sewage autotrophic nitrogen removal device and method

Abstract

The invention belongs to the technical field of biological sewage treatment, and relates to a sewage autotrophic nitrogen removal device and method. Sewage enters a short-cut nitrification anaerobic ammonia oxidation coupled denitrification nitrogen removal IFAS reactor, low-oxygen aeration stirring is firstly carried out, ammonia oxidizing bacteria utilize ammonia nitrogen in inlet water to carryout short-cut nitrification reaction under a low-oxygen condition, and nitrite nitrogen is generated; then aeration is stopped, an anoxic stirring stage is entered, the activity of nitrite oxidizingbacteria isinhibited by adopting an intermittent aeration mode, and conditions are created for self-generation of anaerobic ammonia oxidizing bacteria; residual ammonia nitrogen and nitrite nitrogen in the sewage are subjected to anaerobic ammonia oxidation reaction by the successfully-generated anaerobic ammonia oxidizing bacteria to generate nitrogen and a small amount of nitrate nitrogen, and the residual nitrate nitrogen can be utilized by denitrifying bacteria and is subjected to denitrification reaction to generate nitrogen, so that deep removal of total nitrogen and organic matters in the system is realized; the device is simple in structure, convenient to operate, free of additional carbon source and anaerobic ammonia oxidation sludge inoculation, energy-saving, emission-reducing,economical and efficient.

Description

Technical field: [0001] The invention belongs to the technical field of sewage biological treatment, and relates to a device and method for autotrophic denitrification of sewage, in particular to a device and method for autotrophic denitrification of sewage by self-generating anammox bacteria and inhibiting the enrichment of nitrite oxidizing bacteria method. Background technique: [0002] In the process of biochemical treatment of urban sewage, a large amount of excess sludge will be produced, which needs to be treated with anaerobic digestion. Anaerobic digestion is the ammonification of organic nitrogen under anaerobic conditions to synthesize NH 4 + -N transferred to the sludge digestate. Sludge digestate is a typical high NH 4 + -N low C / N sewage (NH 4 + The concentration of -N will even exceed 800mg / L, and the C / N ratio is only 0.7~0.8), although the treatment amount is very small, the NH contained 4 + The load of -N can be as high as 15% to 25% in the total ni...

AI Technical Summary

Problems solved by technology

The existing synchronous nitrification and anammox coupled denitrification (SNAD) start-up method is mainly to start the synchronous nitrification and denitrification (SND) first and then add anammox (Anammox): on the one hand, the enrichment and cultivation time of AAOB is longer ; On the other hand, the coupling between SND and Anammox and its stable maintenance are more difficult

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