Method for processing town sewage using composite vertical current artificial marshland and apparatus thereof

Abstract

This invention discloses a method and a device for the treatment of urban domestic sewage by composite vertical current constructed wetlands. The method connects two levels of vertical upstream current constructed wetlands in series for the treatment of urban domestic sewage; firstly, the urban domestic sewage enters a primary sedimentation tank, and enters a level I vertical upstream current constructed wetland and a level II vertical upstream current constructed wetland in sequence after pre-sedimentation; the ultimate effluent can be used for agricultural irrigation or be discharged into rivers. The invention, which connects the two levels vertical upstream currents in series for the treatment of urban domestic sewage, are characterized by powerful detergency, strong nitrification and denitrification capacity, little water potential loss and low energy-consumption requirement; accordingly, the required falls of water between the pretreatment tank and the level I constructed wetland and between the two levels of constructed wetlands are small. The method of the invention can utilize the composite vertical upstream currents to efficiently improve the resistance to the external temperature impact and keep satisfactory effect of removing contaminants in winter. The device is simple in structure, which is helpful for large-scale promotion.

Description

technical field [0001] The invention relates to a domestic sewage treatment method and a device thereof, in particular to a method and a device for treating urban domestic sewage by using a composite vertical flow constructed wetland. Background technique [0002] At present, the treatment methods of composite vertical flow constructed wetlands for urban domestic sewage are mainly the composite system of downflow and upflow and the composite system of downflow and downflow. [0003] Composite system of downflow and upflow: It is composed of a downflow pool and an upflow pool. There is a partition wall between the two pools, and the bottom is connected. The height of the bed is 50-60cm. In the center of the surface of the descending pool is a perforated water distribution pipe with small holes drilled in the lower half, so that the water inflow can be evenly distributed to the surface of the wetland. The water in the upward pool, the upward pool uses the "H" type pipeline co...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages are: (1) Downstream-Upstream and Downstream-Downstream have a large head loss; (2) When the water level difference between the pretreatment pool and the downstream pool does not meet the requirements, the Downstream-upstream and downstream-downstream composite systems cannot be used; (3) In the two composite systems, the first pool is artificially arranged to undertake nitrification, and the second pool undertakes denitrification, so that in the downstream -In the upstream composite system, the denitrification of the second pond lacks carbon sources, which affects the nitrogen removal efficiency of the entire system

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