A water purification method for a constructed wetland system

Abstract

The invention relates to a water purification method of an artificial wetland system. The artificial wetland system applicable to the low-temperature environment is constructed and operated in non-winter seasons, a heating mechanism and an aeration mechanism are turned off, a water inlet / outlet pipeline mechanism controls water flow to sequentially flow through a horizontal subsurface wetland unit and a vertical current wetland unit for gradient water purification, when the artificial wetland system is operated in winter, the horizontal subsurface wetland unit is used as tundra after being filled with water, the heating mechanism and the aeration mechanism are turned on, and the water inlet / outlet pipeline mechanism controls water flow to directly flow through the vertical current wetland unit for water purification. Compared with an artificial wetland purification method adopting traditional thermal insulation measures, the purification method has the advantages that the wetland operation temperature can be significantly increased, the nitrogen and phosphorus removal effect is good, the investment and operation cost is low, blockage cannot occur easily and the like, and the purification effect can still be guaranteed in cold winter.

Description

technical field [0001] The invention relates to the field of constructed wetlands, in particular to a water purification method suitable for a constructed wetland system in a low-temperature environment, especially suitable for operation in a low-temperature environment in northern winter. Background technique [0002] As a new type of sewage treatment ecosystem developed in the 1970s, constructed wetlands have been widely used all over the world due to their advantages such as low construction and operation costs, strong decontamination ability, long service life, simple process, and diverse combinations. application. [0003] However, the constructed wetland is a man-made natural ecosystem, which is greatly affected by factors such as seasons and temperature. Especially in the cold northern winter, the surface soil layer is in a frozen state, and there are many problems in the constructed wetland, such as frozen plants, dead plants, frozen filling layers, hypoxia in the b...

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Problems solved by technology

[0005] However, in actual operation, cold-resistant plants can only guarantee survival in a low-temperature environment, and the removal effect on pollutants is poor; heat preservation measures, whether it is greenhouse insulation, plant covering, plastic film covering or ice covering, etc., can only prolong the operation The time is 1 to 2 months, and the operation processing rate is not high, and the expected effect cannot be achieved

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