Device and method for realizing deep denitrification of domestic sewage by main-flow internal-source short-range denitrification/anaerobic ammoxidation technology

Abstract

The invention discloses a device and a method for realizing deep denitrification of domestic sewage by a main-flow internal-source short-range denitrification / anaerobic ammoxidation technology. The device comprises a municipal sewage raw water tank, an internal-source short-range denitrification reactor, an intermediate water tank I, a nitrification reactor, an intermediate water tank II and an anaerobic ammoxidation reactor. The method comprises the steps that municipal sewage enters the internal-source short-range denitrification reactor; a microorganism absorbs an organic matter in raw water to be converted into PHAs (polyhydroxyalkanoates); the sewage enters the nitrification reactor for full-range nitrification; the nitrified sewage enters the internal-source short-range denitrification reactor again to realize conversion from nitrate nitrogen to nitrite nitrogen; and then the sewage enters the anaerobic ammoxidation reactor to realize autotrophic deep denitrification. The method can stably realize main-flow anaerobic ammoxidation of the municipal sewage with a low C / N ratio; no external carbon source is required; the aeration amount is saved; the sludge yield is low; operation control is simple; and high-efficiency and low-energy municipal sewage treatment is realized.

Description

Technical field:

[0001] The invention relates to a device and method for realizing deep denitrification of domestic sewage by a mainstream endogenous short-range denitrification / anammox process, and belongs to the technical field of low C / N ratio urban sewage treatment. Background technique:

[0002] Sewage denitrification treatment is extremely important to protect water resources, but strict discharge standards mean excessive energy consumption. Therefore, economical and effective biological denitrification process has been widely studied and applied. my country's urban sewage has a low carbon-to-nitrogen ratio (C / N) and a serious shortage of carbon sources, making it difficult for traditional biological denitrification processes to treat the sewage up to standard. However, the anammox technology does not require carbon sources to achieve efficient nitrogen removal, reduces the demand for carbon sources and energy, and has low sludge production, so it has become a hot res...

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