Sewage treatment system and method for strengthening anaerobic ammonia oxidation denitrification and dephosphorization of domestic sewage

Abstract

The invention discloses a sewage treatment system and method for strengthening anaerobic ammonia oxidation denitrification and dephosphorization of domestic sewage. The sewage treatment system comprises a filtering module, an anaerobic-aerobic-anoxic baffled reactor (AOABR) module, a water distribution module and a combined constructed wetland module which are connected in sequence. The AOABR module is arranged at the front end of the combined constructed wetland module; the intermittent micro-aeration AOABR can reduce the organic load entering a constructed wetland, reduce the wetland blockage risk, improve the abundance of anaerobic ammonia oxidation autotrophic bacteria in a first-stage saturated flow wetland, retain an ammonia nitrogen substrate required by anaerobic ammonia oxidationreaction and create a micro-aerobic condition on the surface layer of the wetland to form a nitrite nitrogen substrate; under the condition of low organic matter load, the mutual benefit and symbiosisof denitrifying phosphorus removal bacteria and anaerobic ammonium oxidation bacteria in a saturated flow wetland are also facilitated, the coupled synergistic removal of nitrogen and phosphorus is realized under the conditions of low energy consumption and carbon limitation, and the removal efficiency of total nitrogen and total phosphorus can be up to 90% or above by combining multistage saturated and unsaturated flow wetlands.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a sewage treatment system and method for strengthening anaerobic ammonium oxidation denitrification and simultaneous phosphorus removal of domestic sewage. Background technique [0002] Constructed wetlands are an economical, environmentally friendly and eco-friendly water treatment technology, mainly including vertical flow constructed wetlands, horizontal subsurface flow constructed wetlands and surface flow constructed wetlands. It treats sewage through the synergy of substrates, plants and microorganisms, which can not only effectively purify water quality, but also provide habitats for wild animals. In addition, compared with traditional sewage treatment systems, constructed wetlands are simple in structure, easy to maintain, and low in operating costs, so they are widely used in the treatment of various types of sewage. [0003] At present, people generally use the...

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Problems solved by technology

[0003] At present, people generally use the different aerobic and anaerobic environments in the combined constructed wetlands to improve the denitrification effect through nitrification and denitrification. However, the constructed wetlands have the disadvantage of being easy to clog. Or an anaerobic biological treatment system, which greatly reduces the content of organic matter entering the constructed wetland, thereby reducing the risk of clogging the constructed wetland

However, the reduction of organic carbon sources has greatly restricted the follow-up denitrification and denitrification of constructed wetlands. People usually choose to add exogenous organic carbon sources to improve the denitrification effect, but this will inevitably increase the operation and maintenance costs of constructed wetlands.

[0004] In addition, the removal of phosphorus in constructed wetlands is more difficult, which mainly depends on matrix adsorption, followed by the absorption and assimilation of plants and some microorganisms.

However, after a long period of operation, the constructed wetland matrix will appear adsorption saturation

In this regard, people usually take some measures (such as replacing fillers) to restore the phosphorus removal performance of constructed wetlands, but this will destroy the original ecosystem structure of constructed wetlands and increase the operating costs of constructed wetlands

[0005] Therefore, in view of the current problems, it is necessary to develop a new denitrification sewage treatment system that does not depend on the limitation of organic carbon sources, and at the same time solve the problems of easy clogging of constructed wetlands and unstable phosphorus removal efficiency

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