Combined matrix for sewage treatment of subsurface wetland and treatment system

Abstract

The invention provides a combined matrix for sewage treatment of a subsurface wetland and a treatment system. The combined matrix comprises a combined filler unit, an isolation unit and a hard filler unit which are arranged in sequence; the combined filler unit comprises a multi-layer framework structure and a plurality of center ropes perpendicular to the framework structure; each layer of skeleton structure comprises a plurality of annular structures, every two adjacent annular structures are connected with each other through a plastic branch, and the annular structures and the plastic branches form a net-shaped structure; the plane where the annular structures are located is perpendicular to the center ropes, and each center rope penetrates through the annular structure and is connected with the multiple layers of skeleton structures. According to the combined matrix, the combined filler and the hard filler are organically combined so that the organic load bearing capacity of the wetland can be improved on the premise of preventing the matrix filler from being blocked, meanwhile, the pollutant purification efficiency of the wetland is improved, and the combined matrix can be suitable for the condition of relatively large pollution load.

Description

technical field [0001] The invention relates to the field of surface sewage treatment, in particular to a combined substrate and treatment system for subsurface wetland sewage treatment. Background technique [0002] Constructed wetlands can be used to treat sewage. Constructed wetlands usually use the synergy of physics, chemistry and biology to treat surface sewage. Subsurface wetland is the most commonly used type of artificial wetland. Subsurface wetland is an artificial landscape with hydrophilic plants as surface greening and sandy soil as matrix filler to allow water to infiltrate and filter naturally. Subsurface flow wetlands can also be used for general sewage treatment. Natural gravels or adsorbed gravels of different particle sizes are used at the bottom, natural gravels or adsorbed gravels with a second-order particle size are used in the middle and upper layers, and the surface layer is planted in the form of sand or soil. Water-based surface greenery. The sur...

AI Technical Summary

Problems solved by technology

However, the rigid matrix filler has limitations because it is relatively fixed. In the case of a large pollution load, the biofilm formed on the surface of the matrix filler and the plant root system will grow and fall off in large quantities, and it is easy to block the pores of the matrix filler, resulting in the sewage treatment of constructed wetlands. The capacity of the system for sewage treatment is significantly reduced

In addition, the sewage treatment system in the existing constructed wetland has a limited capacity to bear the load of organic pollutants. When the pollution load is large or the sewage flow is large, the structure of the treatment system is easily damaged and blocked, reducing the efficiency of sewage purification.

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