Sewage treatment method and system

Abstract

The invention discloses an inexpensive sewage treatment method and system. Sewage flows from a sewage pipe into a coarse grid pump station with a coarse grid, large suspended solids and floaters are crushed or blocked in the coarse grid pump station and are fed into an adjustment tank, the suspended solids and sediment are further blocked in the adjustment tank so that water quality and amount areadjusted, the treated water is fed into an A / A / O reactor, the A / A / O reactor reduces the concentrations of COD and ammonia-nitrogen pollutants in the wastewater and feeds the wastewater into a sedimentation reactor, product water precipitated by the sedimentation reactor is fed into a constructed wetland, product water subjected to reduction of the concentrations of COD and ammonia-nitrogen pollutants is disinfected and the wastewater satisfying the standards is discharged. The system has strong water quality impact load resistance and a high automation degree, produces product water with stable quality reaching to or better than the level A, realizes a low investment and operation cost and is suitable for treatment on wastewater in small and medium-sized water use townships with a high groundwater level, deeper depth of the buried wastewater inlet pipe and high product water requirements.

Description

Technical field [0001] The invention relates to a sewage treatment method and system, belonging to the technical field of wastewater treatment. Background technique [0002] At present, as the construction of urban sewage treatment facilities is basically completed, the discharge of domestic sewage in villages and towns has become an important factor in China’s river pollution. With the rapid economic development and the improvement of living standards, the discharge of domestic sewage in villages and towns has increased significantly. The handling of this has become the focus of attention of local governments. At present, many established sewage treatment facilities in villages and towns have problems such as unsteady discharge of effluent and high operating costs. For example, the activated sludge method has a large area and membrane treatment process has high investment and operating costs, so its application is subject to certain restrictions. limit. Therefore, it is necess...

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Problems solved by technology

[0005] Although the above-mentioned patents all involve sewage treatment in villages and towns, they still occupy a large area, and the construction and operation costs are relatively high, so it needs to be improved.

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