Sector-shaped multi-dimensional cross-flow type composite terrestrial plant buffer zone and construction method thereof

Abstract

The invention relates to a sector-shaped multi-dimensional cross-flow type composite terrestrial plant buffer zone and a construction method thereof. The buffer zone is formed by connecting a sector-shaped transverse-flow herb-biochar zone, a sector-shaped longitudinal-flow denitrification zone, a sector-shaped transverse-circular-flow pollutant enrichment shrub-herb zone, a sector-shaped longitudinal-flow dephosphorization zone, a sector-shaped transverse-circular-flow tree-herb-biochar zone as well as necessary ridges, braiding channels or water-permeable walls in series. Low-concentration wastewater such as tail water of urban sewage treatment plants, agricultural wastewater, surface runoff of villages and small towns and the like sequentially flows through the zones after simple sedimentation, and suspended matters, organic matters, nutrient elements, pesticides and the like in the wastewater are gradually reduced. The vegetation buffer zone is applicable to peripheries of reservoirs, rivers or lakes with limited shore land areas and can effectively prevent water environment pollution; native plants are combined harmoniously, so that the buffer zone has the good treatment effect as well as the good landscape effect, the good ecological benefit and high popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of water pollution control and ecological restoration, and specifically relates to a fan-shaped multi-dimensional cross-flow composite terrestrial plant buffer zone and a construction method thereof. Background technique [0002] As an ecological engineering unit for protecting water bodies, the water-land ecotone can intercept suspended solids entering lakes, reservoirs, rivers and other waters, remove nitrogen and phosphorus nutrients, degrade pesticides, and ensure the quality of the water environment. At the same time, the water-land ecotone is also an important part of regional nutrient management, soil erosion control, and protection of freshwater resources and environments. It plays an important corridor and filter for material circulation, energy flow, information transmission, and biological flow between land and water ecosystems. It plays a decisive role in the stable development of the regional ec...

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Problems solved by technology

But there are also the following defects: the plants used in the patent are mainly aquatic plants with a single type; the water flow that pollutes the incoming water is not designed, the functional division of the system is not clear, and the interception effect and ability are insufficient

[0006]1) The shore buffer zone (water-land ecotone) is used as the only barrier for water body protection, and the establishment of a terrestrial vegetation buffer zone outside the buffer zone is not considered;

[0007]2) In view of the limited land area on the shore of the water body, the design of the shape of the buffer zone and the state of the water flow is insufficient;

[0008]3) In the past, the buffer zone mainly completed the removal of pollutants through the physical, chemical and biochemical interactions between matrix fillers and plants, and failed to clearly distinguish different pollutants in structure The pollutant removal function area, the pollutant removal ability cannot be fully exerted,

[0009]4) In the past, most of the buffer zones focused on their pollution reduction function, and seldom involved biodiversity protection and landscape aesthetics.

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