Thin plant packed bed and hydroponic plant bed superimposed wetland processing sewage system

Abstract

The invention discloses a thin plant packed bed and hydroponic plant bed superimposed wetland processing sewage system comprising an upper plant packed bed and a lower hydroponic plant bed, wherein the upper plant packed bed comprises a bed body, packing and an emergent aquatic plant; the packing is arranged in the bed body, and the emergent aquatic plant is planted on the packing water is supplied from a region on the right side of the bed body, and overflows from a region on the left side of the bed body; the lower hydroponic plant bed comprises a water collection zone, a plant cultivation tank and a hydroponic plant; the hydroponic plant is planted in the plant cultivation tan; the water collection zone is used for collecting water overflowing from the region on the left side of the bed body and supplying water to the region on the right side of the plant cultivation tank; a water outlet is formed on the right side of the plant cultivation tank. The system disclosed by the invention, which is formed by superimposing two artificial wetland systems vertically, not only nearly doubles land area utilization ratio and overcomes a shortcoming of a conventional simple wetland which is large in occupied space, but also improves sewage treatment efficiency through integrating biological adsorption and degradation of plant and microorganism a well as physical entrapment, filtration and other treatment functions of the packing layer.

Description

technical field [0001] The invention relates to artificial wetland, water body ecological restoration and sewage treatment technology, in particular to a thin-layer plant packing bed and hydroponic plant bed superimposed wetland sewage treatment system, which belongs to the artificial wetland sewage purification technology. Background technique [0002] Constructed wetland is a special ground that is artificially built and controlled, and generally includes three main parts: filler, plants and microorganisms. During operation, the sewage is controlled and distributed to the constructed wetland, and the synergistic effects of fillers, plants and microorganisms in physics, chemistry, and biochemistry are used to complete the purification of sewage. Its mechanism of action includes adsorption, retention, filtration, redox, precipitation, microbial decomposition, transformation, and residue accumulation. [0003] Constructed wetlands can not only effectively remove nitrogen, ph...

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Problems solved by technology

[0004] As a technical means of sewage treatment, constructed wetlands not only have good sewage treatment effects, but also have the advantages of less investment, simple process, low operating costs, and convenient management. However, there are also some shortcomings that restrict development at the same time: Most of the constructed wetlands in China adopt a planar structure, the water flow is relatively gentle, the operation time is long, and the level of dissolved oxygen in the matrix is ​​low; the planar wetland is also prone to dead ends, and water flow silting is also a problem to be solved; in addition, the sewage treatment level of the constructed wetland Proportional to the land area, to form a certain scale of sewage treatment, there are high requirements on the nature and area of ​​the land, this objective condition also limits the popularization and application of constructed wetlands

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