A method for reducing pollution in the riparian zone

Abstract

The invention discloses a riparian zone sewage reduction method, particularly a riparian zone sewage reduction method by combining a perennial vegetation zone and an infiltration reinforcement zone. The method comprises the following step: arranging an infiltration reinforcement zone and a perennial herb sewage interception buffer zone for the riparian zone, wherein the sewage interception buffer zone is composed of a hygrophytic herb zone, a mesozoic herb zone and a xeromorphic herb zone which are sequentially arranged from the riverbank to the place far away from the riverbank, a reaping mode is adopted to reduce the growth of the annual herbs, and the infiltration reinforcement zone is arranged between the hygrophytic herb zone and the mesozoic herb zone. The method can effectively intercept sewage and increase the infiltration amount of underground water; and the perennial herbs have developed root systems, so the reasonable arrangement of the perennial herbs is beneficial to enhancing the sewage interception capacity and water / soil retention capacity of the riparian zone. By sectionallly planting and arranging the hygrophytic, hygrophytic and xeromorphic perennial herbs, the vegetation can be regulated to enhance the sewage interception capacity of the riparian buffer zone.

Description

technical field

[0001] The invention belongs to the field of non-point source pollution control, and in particular relates to a method for improving the pollutant interception capacity of surface runoff by utilizing riparian zone plants and infiltration enhancement zones. Background technique

[0002] Riparian vegetation is very important for the ability of riparian zone to intercept the surface runoff of polluted water. Herbaceous plants, because of their high growth density and relatively small individual plants, can cover the surface, so they can slow runoff and remove the surface. It has a good effect on runoff pollutants, degradation and adsorption of pollutants. The root system and soil of riparian vegetation can be combined with each other, which can form a strong biological cohesion, which is conducive to strengthening the spatial structure of the soil, and the perennial herbs have more developed roots than the annual herbs, which can improve the pollutant intercepti...

Examples

Embodiment 1

[0029] Using the riparian soil of Chaobai River in Beijing, a small test simulates the infiltration enhancement zone to treat runoff pollution, and at the same time compares the differences in the removal of pollutants by surface seepage. The percolation strengthening belt simulation experiment device is made of plexiglass. Its main part is 310mm high, 1500mm long, and 150mm wide, and it is strip-shaped; the bottom layer is set with a gravel layer with a particle size of 5-8mm, and the upper part of the gravel layer is 7cm For a thick sawdust-soil mixed layer with a dry weight ratio of 1:7, lay a layer of geotextile between the gravel layer and the sawdust-soil mixed layer to block the particulate matter in the seepage flow from entering the bottom outlet; in the sawdust-soil mixed layer The upper part is the percolation layer, which is composed of 7cm thick river sand with a dry weight ratio of 1:1 mixed with filler, and the filler is zeolite. At the same time, considering th...

Embodiment 2

[0033] Using the simulated small-scale test device of Example 1, all the riparian soils were used for filling, and ryegrass, annual saxifrage, and paradise grass were planted respectively, and the simulated riparian soil interception experiment was carried out. Four small test devices are connected in series to simulate a 6-meter-wide riparian zone. The initial pollutant concentrations in the simulated runoff were: total nitrogen 7 mg / L, ammonia nitrogen 3 mg / L, nitrate nitrogen 4 mg / L, and total phosphorus 0.8 mg / L. The results showed that ryegrass had better removal effects on total nitrogen, ammonia nitrogen, nitrate nitrogen and total phosphorus. The removal rates of ryegrass for the four pollutants were 30.1%, 21.9%, 33.6% and 40.5%, respectively, and the treatment effect was higher than that of saxifrage (26.7%, 18.0%, 23.5% and 31.2%) and paradise grass (24.6%, 19.2%, 22.1% and 29.4%). This indicates that the perennial herbs planted in the riparian zone have better ab...

technical field

[0001] The invention belongs to the field of non-point source pollution control, and in particular relates to a method for improving the pollutant interception capacity of surface runoff by utilizing riparian zone plants and infiltration enhancement zones. Background technique

[0002] Riparian vegetation is very important for the ability of riparian zone to intercept the surface runoff of polluted water. Herbaceous plants, because of their high growth density and relatively small individual plants, can cover the surface, so they can slow runoff and remove the surface. It has a good effect on runoff pollutants, degradation and adsorption of pollutants. The root system and soil of riparian vegetation can be combined with each other, which can form a strong biological cohesion, which is conducive to strengthening the spatial structure of the soil, and the perennial herbs have more developed roots than the annual herbs, which can improve the pollutant intercepti...

Examples

Embodiment 1

[0029] Using the riparian soil of Chaobai River in Beijing, a small test simulates the infiltration enhancement zone to treat runoff pollution, and at the same time compares the differences in the removal of pollutants by surface seepage. The percolation strengthening belt simulation experiment device is made of plexiglass. Its main part is 310mm high, 1500mm long, and 150mm wide, and it is strip-shaped; the bottom layer is set with a gravel layer with a particle size of 5-8mm, and the upper part of the gravel layer is 7cm For a thick sawdust-soil mixed layer with a dry weight ratio of 1:7, lay a layer of geotextile between the gravel layer and the sawdust-soil mixed layer to block the particulate matter in the seepage flow from entering the bottom outlet; in the sawdust-soil mixed layer The upper part is the percolation layer, which is composed of 7cm thick river sand with a dry weight ratio of 1:1 mixed with filler, and the filler is zeolite. At the same time, considering th...

Embodiment 2

[0033] Using the simulated small-scale test device of Example 1, all the riparian soils were used for filling, and ryegrass, annual saxifrage, and paradise grass were planted respectively, and the simulated riparian soil interception experiment was carried out. Four small test devices are connected in series to simulate a 6-meter-wide riparian zone. The initial pollutant concentrations in the simulated runoff were: total nitrogen 7 mg / L, ammonia nitrogen 3 mg / L, nitrate nitrogen 4 mg / L, and total phosphorus 0.8 mg / L. The results showed that ryegrass had better removal effects on total nitrogen, ammonia nitrogen, nitrate nitrogen and total phosphorus. The removal rates of ryegrass for the four pollutants were 30.1%, 21.9%, 33.6% and 40.5%, respectively, and the treatment effect was higher than that of saxifrage (26.7%, 18.0%, 23.5% and 31.2%) and paradise grass (24.6%, 19.2%, 22.1% and 29.4%). This indicates that the perennial herbs planted in the riparian zone have better ab...

Images