A sewage treatment system and method for strengthening domestic sewage anaerobic ammonium oxidation denitrification and simultaneous phosphorus removal

Abstract

The invention discloses a sewage treatment system and method for strengthening domestic sewage anaerobic ammonium oxidation denitrification and simultaneous phosphorus removal. The sewage treatment system includes a filtration module, an anaerobic-aerobic-anoxic baffle reactor (AOABR) module, a water distribution module and a combined artificial wetland module connected in sequence. In the present invention, an AOABR module is arranged at the front end of the combined artificial wetland module. The intermittent micro-aeration AOABR can reduce the organic load entering the artificial wetland, reduce the risk of wetland blockage, and increase the abundance of anammox autotrophic bacteria in the first-stage saturated flow wetland. Retain the ammonia-nitrogen substrates required by the anammox reaction and create micro-aerobic conditions in the wetland surface to form nitrite-nitrogen substrates; low organic matter load conditions are also conducive to the mutual symbiosis of denitrifying phosphorus-removing bacteria and anammox bacteria in saturated wetlands , under the conditions of low energy consumption and carbon limitation, the coupling and synergistic removal of nitrogen and phosphorus can be realized, and the combined use of multi-stage saturated and unsaturated flow wetlands can make the removal efficiency of total nitrogen and total phosphorus as high as 90%.

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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