Multistage sewage treatment system and method

Abstract

The invention provides a multistage sewage treatment system which sequentially comprises a sand setting device for removing sands in sewage, a water collecting and deodorizing device for blowing sewage and eliminating smell of sewage, a sewage degrading device for degrading and stabilizing organic matters in sewage, a wetland filter device for removing nitrogen compounds, phosphorus compounds and degradation-resistant organic matters in water, a quartz sand filter device for blocking suspended matters in sewage, an activated carbon filter device for absorbing peculiar smell and absorbing harmful substances and an ecological circulating device for improving the water quality. The multistage sewage treatment system provided by the invention can remove impurities such as solid impurities, colloid matters, nitrogen compounds, phosphorus compounds, heavy metals, degradation-resistant organic matters, bacteria and viruses in sewage to obtain ideal water quality.

Description

technical field [0001] The invention relates to a multistage sewage treatment system and method. Background technique [0002] All over the world, especially in some developing countries, the industrial sewage discharged from various industrial production processes has caused serious harm to the environment. According to the water quality evaluation conducted by relevant departments on 130,000 kilometers of rivers across the country, Nearly 50% of the water quality is seriously polluted, and water pollution has shown a trend of penetrating from the surface to the ground, from tributaries to main streams, from cities to rural areas, and from land to sea. [0003] There are many reasons for water pollution, mainly the pollution of industrial wastewater and domestic sewage. These waters contain harmful chemical ions, solid impurities, colloidal substances, nitrogen compounds, phosphorus compounds, heavy metals, refractory organic matter, bacteria and viruses without exception. ...

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Problems solved by technology

[0003] There are many reasons for water pollution, mainly the pollution of industrial wastewater and domestic sewage. These waters contain harmful chemical ions, solid impurities, colloidal substances, nitrogen compounds, phosphorus compounds, heavy metals, refractory organic matter, bacteria and viruses without exception. etc. Currently, three-stage sedimentation tanks are generally used for the treatment of construction water and domestic water, but the effect of sewage filtration and sedimentation is obviously insufficient. The filtration treatment of sewage is only a process of precipitation, and there is no decomposition of chemical ions and organic matter. Guaranteed, these impurities cannot be completely removed

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