Sewage treatment system and method based on magnetic coagulation AAS and magnetization MABR

Abstract

The invention provides a sewage treatment system and method based on magnetic coagulation AAS and a magnetization MABR. The sewage treatment system comprises a magnetic-coagulation and anoxic-activated-sludge treating unit, an anoxic sludge magnetic separation unit, a magnetized-nitrified-sludge and membrane separation unit and an aerobic sludge magnetic separation unit. Sewage enters the magnetic-coagulation and anoxic-activated-sludge treating unit, magnetic powder and a chemical coagulant are put for treatment, then the product is separated through the anoxic sludge magnetic separation unit, the separated sewage enters the magnetized-nitrified-sludge and membrane separation unit, magnetic powder is put for treatment, the product is separated through the aerobic sludge magnetic separation unit, and nitrification liquid flows back to the magnetic-coagulation and anoxic-activated-sludge treating unit. By means of the sewage treatment system and method in the technical scheme, nitrogen and phosphorus in the sewage are synchronously and deeply removed, it is guaranteed that carbon and nitrogen are removed through organisms, membrane pollution is effectively relieved, and the sewage treatment system and method have the better de-nitrification effect, phosphorous removing effect and nitration effect and the shorter sludge-water mixed liquid separating time.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a sewage treatment system and treatment method based on magnetic coagulation AAS and magnetized MABR. Background technique [0002] At present, the "centralized" sewage treatment system is in the mainstream position in the world, but under the influence of the trend of sustainable development, it is reflecting on the shortcomings of centralized sewage treatment, which is a terminal treatment in terms of recycling resources and energy in sewage, and will then develop and applied interest towards decentralized processing, especially source control. The International Institute for Water Quality (IAWQ) even proposed at the "Small Sewage Treatment Facilities" symposium: the population equivalent is below 2000 or the flow is 200m 3 Sewage stations below / d are small sewage stations. Numerous studies have pointed out that the construction of miniaturized sewage tre...

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Problems solved by technology

Constructed wetlands occupy a large area and are unstable in operation, so they are not suitable for promotion in cities with tight land use

Membrane bioreactor has the advantages of small footprint, easy assembly, and large biomass. It is the best choice for urban decentralized sewage treatment processes, but there are also the following problems: 1) synchronous deep nitrogen and phosphorus removal effects; 2 ) Membrane clogging; 3) Problems such as excess sludge treatment are technical bottlenecks faced by membrane technology

However, the membrane process still has the following problems: 1) The membrane process has a long sludge discharge cycle and low biological phosphorus removal efficiency, which makes it difficult to synchronize deep nitrogen and phosphorus removal in the process; 2) The chemical synergistic phosphorus removal in the membrane process will bring two Aspects of problems, one is the inhibition of chemical agents on the activity of nitrification sludge, the other is the problem of membrane clogging caused by chemical sludge; 3) the problem of membrane fouling, which leads to shortened operation period and increased operation cost

The above problems limit the scope of application of membrane bioreactors

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