Multistage-series stepped natural-type artificial wetland and construction method

Abstract

The invention discloses a multistage-series stepped natural-type artificial wetland. The multistage-series stepped natural-type artificial wetland comprises N-stage wetlands, wherein water distribution channels having depths which are sequentially increased along a water flow direction are arranged between every two adjacent wetlands; and the wetland of each stage is sequentially composed of aquatic plants, a soil layer and a matrix layer from top to bottom, and artificial porous permeation tubes are arranged in the matrix layer along the water flow direction. A construction method for the wetland comprises the following steps of: a) excavating a wetland bed body; b) performing anti-seepage treatment; c) filling a matrix and the permeation tubes; d) covering the coil layer; e) building the channels; f) cultivating aquatic plants; and g) purifying a water body. Via the wetland and the construction method for the same, the automatic flowing of sewage is realized, and energy is saved; the water distribution channels and the permeation tubes with different depths are beneficial to the survival of aerobic micro-organisms and anaerobic micro-organisms, thus realizing rapid and efficient purification for sewage; and by distributing the artificial porous permeation tubes, the free permeation of the water body is ensured, the contact surface area is increased, the purification capacity is improved, the blockage of the matrix layer and the eutrophication of the water body are avoided, and the service life of the wetland is prolonged.

Description

technical field [0001] The present invention relates to a multi-stage cascaded natural artificial wetland and its construction method, more specifically, to a multi-stage cascaded natural artificial wetland with good water permeability and natural water flow and its construction method. Background technique [0002] Constructed wetlands are a comprehensive ecosystem that purifies pollutants by using the physical, chemical and biological synergies of substrates, plants and microorganisms in the system, and is mainly used for deep purification of urban sewage. Constructed wetland technology is a new type of sewage treatment technology, mainly by simulating the purification principle of natural wetlands, and dosing sewage and sludge in a controlled manner on artificially constructed wetlands. During the process of sewage flowing in a certain direction, the main Utilize the synergistic effect of soil, artificial substrate, plants and microorganisms to realize the purification tr...

AI Technical Summary

Problems solved by technology

[0004] A large number of constructed wetlands have been constructed in my country and used for deep purification of sewage. However, in actual operation, since traditional constructed wetlands are mainly filled with gravel, sand, etc., it is easy to cause low void ratio and poor oxygenation effect, and it is easy to appear in long-term operation clogging, low processing efficiency

The patent number is CN201110114364.9, and the invention name is a patent document of a constructed wetland and its construction method, which discloses a vertical constructed wetland, which is composed of a vertical slope 1, aquatic plants 2, wetland pool 3, oyster shell 4 Composition, in the process of purifying the water body to be treated, special equipment is required for water supply and drainage, which consumes a lot of energy, and the oyster shell 4 is not easy to obtain, and the construction cost is relatively high

The patent number is CN201210320781.3, and the name of the invention is countercurrent vertical constructed wetland system, which mainly consists of water inlet pipe 1, water distribution area 1, aquatic plants 3, gravel 4, zeolite 4, pebble 7, steel slag 8, limestone 9 and water outlet pipe Composition of 10, which requires the pump body to discharge the water body into the water distribution area, the water body to be purified flows from top to bottom in the first artificial wetland, and flows from bottom to top in the second artificial wetland, so as to achieve the purification effect ; This form of artificial wetland not only has high cost, but also high energy consumption, which is not conducive to large-scale promotion

The patent number is CN201010233038.5, and the patent document of the invention name is hydraulic aerated artificial wetland, which discloses a wetland plant 1, filler 2, support wall 3, water collection and distribution main pipe 4, water inlet tank, intermittent water inlet control The artificial wetland composed of device 6, aerator 7, etc. needs to build support wall 3, water supply and drainage devices, and aeration equipment during the establishment process, which also has the disadvantages of high construction cost and high energy consumption in operation

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