Autotrophic anti-clogging constructed wetland for deep purification of tail water of sewage treatment plant

Abstract

The invention relates to an autotrophic anti-clogging constructed wetland for deep purification of tail water of a sewage treatment plant. The wetland comprises a water purification plant, a water collection area, a core functional filler matrix area, a cobblestone layer and a water distribution and sludge discharge area which are sequentially arranged from top to bottom, and the water distribution and sludge discharge area comprises a perforated support plate, a multi-bucket V-shaped sludge collection tank, support columns and wetland bottom fixed support columns; the perforated support plateis supported; the lower part of the multi-bucket V-shaped sludge collecting tank is filled with large cobblestones; the core functional filler matrix area is arranged at the upper part of the perforated support plate, the bottom of the perforated support plate is provided with a cobblestone layer to ensure uniform water inflow, purification plants are planted at the upper part of the core functional filler matrix area, and a drainage pipe is arranged in the water collection area to collect treated tail water and discharge the tail water out of the wetland. The constructed wetland can solve the problems that the concentration of NO3-N in tail water of an existing sewage treatment plant is high, the phosphorus concentration needs to be further reduced, a matrix of an autotrophic wetland isseriously hardened in long-term operation of actual engineering, a system is blocked and the like.

Description

technical field [0001] The invention belongs to the technical field of waste water advanced treatment, and in particular relates to a self-supporting anti-clogging artificial wetland for deep purification of tail water of sewage treatment plants. Background technique [0002] In recent years, with the rapid development of my country's social economy and the continuous improvement of urbanization, the amount of sewage discharge remains high. However, due to the limitation of water treatment technology, water quality indicators such as nitrogen and phosphorus in urban domestic sewage are often not met after being treated by sewage plants. To meet the "Environmental Quality Standards for Surface Water" stipulated by the state, direct discharge of tail water from sewage treatment plants into rivers and lakes will cause serious water eutrophication, algal blooms, and further endanger the safety of the water environment. Therefore, for the tail water of sewage treatment plants, fur...

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Problems solved by technology

[0008] The purpose of the present invention is mainly to aim at existing sewage treatment plant tail water NO 3 -The concentration of N is high, the concentration of phosphorus needs to be further reduced, the matrix of the autotrophic wetland is seriously compacted, and the system is blocked in the long-term operation of the actual project. and inorganic carbon sources, and undertake a certain electron donor role in the autotrophic denitrification process, and added self-made polyaluminium chloride residue composite filler (free from slag Portland cement, polyaluminum chloride residue, bentonite, etc. Burned packing) as the SO produced during the process of strengthening the adsorption of raw materials 4 2- and phosphate in tail water, as an autotrophic anti-clogging vertical flow artificial wetland for deep purification of tail water in sewage treatment plants, can well solve the above problems existing in the existing nitrogen and phosphorus removal process, and has good technical effects

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