Two-stage short-cut nitrification and anaerobic ammonia oxidation coupled endogenous denitrification deep denitrification device and method thereof

Abstract

The invention discloses a two-stage short-cut nitrification and anaerobic ammonia oxidation coupled endogenous denitrification deep denitrification device and a method thereof. The device comprises araw water tank, a PN reactor, an intermediate water tank and an SAED reactor, urban sewage raw water is stored in the raw water tank, the PN reactor is connected with the raw water tank through a PN water inlet pump, the PN reactor is connected with the middle water tank through a PN water outlet valve; the municipal sewage raw water in the raw water tank is further connected to the SAED reactor through a SAED water inlet pump, the SAED reactor is connected with the middle water tank through the short-cut nitrification liquid inlet pump, and the municipal sewage raw water and short-cut nitrification liquid in the SAED reactor are subjected to deep denitrification and then discharged through a water outlet valve of the SAED reactor. The anaerobic ammonia oxidation coupling endogenous denitrification is taken as a main denitrification way, and the method has the advantages of no need of adding an external carbon source, economy, high efficiency, stable operation and the like, and is suitable for the technical fields of construction of small and medium-sized urban sewage treatment plants, upgrading and reconstruction of constructed projects and the like.

Description

technical field [0001] The application belongs to the technical field of sewage biological treatment, and specifically relates to a deep denitrification device and method of two-stage short-cut nitrification (PN) and anaerobic ammonium oxidation coupling endogenous denitrification (SAED). Background technique [0002] Anammox (Anammox) technology is a new type of efficient, economical and energy-saving biological denitrification technology with good application prospects and commercial value. The biochemical reaction equation of Anammox bacteria is shown in formula (1-1). Compared with the traditional biological nitrogen removal process, the short-cut nitrification-anammox (PN / A) biological nitrogen removal technology can save 100% of the organic carbon source consumption, save 62.5% of the aeration rate, and reduce the sludge production by 90% , so it is considered to be the most promising biological denitrification technology. [0003] [0004] However, up to now, the...

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Problems solved by technology

[0004] However, up to now, the stability of short-cut nitrification of urban sewage under low temperature conditions is still not guaranteed, and the excessive proliferation of nitrite oxidizing bacteria (NOB) may easily lead to NO in short-cut nitrification system. 3 － can not provide suitable for the growth and metabolism of Anammox bacteria Substrate concentration ratio (theoretical value is 1.32), thus affecting the denitrification efficiency of PN / A process

In addition, the presence of organic matter in urban sewage, even after preliminary pretreatment, will still cause Anammox bacteria and other heterotrophic bacteria (OHOs) to compete in the spatial distribution or substrate matrix, which is not conducive to Anammox bacteria becoming the dominant flora of the system

[0005] The coupling of anaerobic ammonium oxidation and endogenous denitrification provides a feasible solution to the problem of poor stability and low nitrogen removal efficiency of PN / A process in urban sewage.

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