A new composite matrix of vertical flow constructed wetland

Abstract

The invention discloses a novel composite substrate for vertical flow artificial wetlands. The novel composite substrate sequentially comprises concrete, volcanic rock and anthracite in the vertical directions from water inlets to water outlets. The total filling height of the novel composite substrate is 100 cm; the bottoms of filler columns are filled with an anthracite substrate with the heights of 18-22 cm and the particle sizes of 0.5-1 cm; the anthracite is filled with a volcanic rock substrate with the height of 28-32 cm and the particle sizes of 1-3 cm; the volcanic rock is filled with a concrete substrate with the height of 48-52 cm and the particle sizes of 3-5 cm. The novel composite substrate has the advantages that the novel composite substrate is inexpensive and is easily available, convenient to operate, free of secondary pollution and high in practicality; synergistic effects can be realized by the anthracite substrate, the volcanic rock substrate and theconcrete substrate, accordingly, the novel composite substrate is favorable for optimizing microbial community structures of the artificial wetlands, stable biological membranes can be formed on the surfaces of the upper-layer concrete substrate, and pollutant removal can be indirectly enhanced; the upper-layer concrete has the large particle sizes, the laying height of the upper-layer concrete accounts for a half of the total height of the novel composite substrate, accordingly, blockage can be effectively relieved, and the service life of the novel composite substrate can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of water pollution control engineering ecology, and more specifically relates to a vertical flow artificial wetland combination matrix, which is suitable for medium-concentration domestic sewage and can efficiently remove nitrogen, phosphorus, organic matter and other pollutants in the sewage. Background technique [0002] Constructed wetlands are based on the ecological principles of natural wetlands, artificially construct subsystems such as substrates, plants, and microorganisms, and comprehensively exert the purification effect of each subsystem, thereby removing pollutants in sewage, and popularizing and applying them in actual projects sewage system. The design and structure of the vertical flow artificial wetland makes the water distribution inside the wetland more uniform and the dissolved oxygen more sufficient, so it has a better purification effect on nitrogen, phosphorus and organic matter. [0...

AI Technical Summary

Problems solved by technology

The particle size distribution of the constructed wetland matrix has a decisive effect on the void volume and water flow pattern in the wetland. The matrix laid in layers should be uniform in each layer. The doping of large and small particles will reduce the porosity of the matrix, affect the water flow distribution, and change the hydraulic state. , affect the permeability of the matrix, and then affect the sewage purification effect

A substrate with a larger particle size can effectively prevent clogging, but too large a particle size will shorten the hydraulic retention time and affect the purification effect

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