Wastewater treatment method and treatment system

Abstract

The invention relates to a wastewater treatment method which comprises the following steps: S1, collecting production wastewater, uniformly stirring and mixing the production wastewater to obtain a wastewater uniformly-mixed solution, and further stirring the blended wastewater uniformly-mixed solution; s2, further treating the wastewater uniformly-mixed liquid subjected to further stirring treatment to obtain a pretreatment liquid; s3, gradually pumping the pretreatment liquid into a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank for reaction to obtain two-stage treatment liquid; s4, carrying out primary mud-water separation on the two-stage treatment liquid, discharging a generated first precipitate, and adding a flocculation agent into a first clarified liquid; and S5, carrying out secondary mud-water separation on the first clarified liquid treated by the flocculating agent, discharging a generated second precipitate, and discharging a second clarified liquid. Organic matters in wastewater are degraded under an anaerobic condition, denitrification and nitrification tanks are used for further treatment, suspended matters are removed by a physicochemical reaction tank, and the wastewater is finally precipitated and discharged after reaching the standard, so that the treatment process is simple and convenient, and the operation and running cost is low.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment method and a treatment system. Background technique [0002] N-methylpyrrolidone is an organic substance. The wastewater containing N-methylpyrrolidone is a high-concentration refractory organic wastewater. This kind of wastewater has a heavy odor and is toxic. Direct discharge will cause serious pollution to the environment. It is more difficult to handle. [0003] At present, the wastewater containing N-methylpyrrolidone is generally treated by photocatalysis, ozone oxidation and other advanced oxidation methods or membrane separation methods. Among them, physical and chemical methods such as advanced oxidation and membrane separation are costly to treat wastewater containing N-methylpyrrolidone, and secondary pollution is serious, and the equipment occupies a large area and the process is complicated. Under the current strict environmental ...

AI Technical Summary

Problems solved by technology

Among them, physical and chemical methods such as advanced oxidation and membrane separation are costly to treat wastewater containing N-methylpyrrolidone, and secondary pollution is serious, and the equipment occupies a large area and the process is complicated. Under the current strict environmental protection laws , it is necessary to develop a wastewater treatment method and treatment system so that the treated wastewater can meet the discharge standards stipulated by the state

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