Backwashable constructed wetland, and production and operation mode thereof

Abstract

The invention discloses a backwashable constructed wetland. The backwashable constructed wetland includes a plurality of ecological tank bodies which are sequentially arranged, and every ecological tank body includes an external supporting box and an internal biochemical floater; the bottom of the supporting box is provided with a water inlet and a water outlet, and the depth of the biochemical floater buried in water is adjusted by the water storage in the supporting box; and a plurality of filler layers are arranged in the biochemical floater, and plants are planted on the first filler layer at the top. An ecosystem constructed in the filler layers is used to realize sewage purification, nitrogen removal and phosphorus removal. The aerobic environment of the first filler layer improvesthe degradation ability of microorganisms; iron-carbon gel balls in the second filler layer provide a sufficient space for the loading of the microorganisms, and the iron-carbon micro-electrolyzes tomake chains of a large number of macromolecular organic pollutants broken in order to improve the biodegradability; and porous carbon release broken stones provide a sufficient carbon source for the microorganisms. The height of the biochemical floater is adjusted by the water storage in the supporting box to achieve the functions of drop aeration, washing and backwashing under normal operation conditions, so the backwashable constructed wetland has a strong practicability and a wide applicability.

Description

technical field [0001] The invention relates to an artificial wetland, in particular to an artificial wetland capable of backwashing and its production and operation mode, and belongs to the technical field of sewage artificial wetland treatment. Background technique [0002] Constructed wetland is an environment-friendly sewage treatment technology, which is a water-purifying composite ecosystem composed of substrates, plants, microorganisms, etc. Through plant absorption, matrix filtration and biological decomposition to achieve efficient purification of sewage, it has the advantages of efficient nitrogen and phosphorus removal and convenient operation and management, and the wetland landscape can increase biodiversity, conserve water sources, and improve visual beauty. [0003] From the perspective of the constructed wetland projects, there are natural phenomena in the long-term operation that microorganisms and plant residues cause matrix clogging and porosity reduction,...

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Problems solved by technology

[0003] From the perspective of the constructed wetland projects, there are natural phenomena in the long-term operation that microorganisms and plant residues cause matrix clogging and porosity reduction, which restricts the long-term operation of constructed wetlands and reduces the efficiency of sewage purification. Many, but there are also many defects

For example, the publication number CN105399207A discloses a backwashable horizontal subsurface flow artificial wetland that can slow down front-end clogging. The wetland changes the particle size of the front-end and back-end substrates, slows down the front-end clogging of the wetland, and cleans the wetland through backwashing. However, the dense matrix at the back end of this method is easy to make cleaning difficult, and the microbial system constructed is relatively simple, resulting in low sewage purification efficiency.

The publication number is CN201610152448.4, which discloses a method and device for anti-clogging water distribution and backwashing in artificial wetlands. The device arranges water distribution pipes on the surface of the artificial wetland and inside the filler, and sets the backwashing intensity according to the degree of blockage of each layer of the wetland. However, The device has technical difficulties and high cost in actual operation

[0004] Therefore, the existing artificial wetlands can relieve wetland blockage in a short period of time, but they occupy a large area, have high construction costs, complex principles, and cannot achieve secondary utilization. The extension of the service life of wetlands is limited, not economical and practical, and seriously affect wetlands. purification effect

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