Enriching and transformation ditch device of protection forest for removal of farmland heavy metals

A technology of heavy metals and shelterbelts, applied in the field of in-situ removal of soil heavy metal pollution in the farmland environment, can solve the problems of reducing mobility and bioavailability, it is difficult to ensure no reverse reaction, pollution, etc., and achieve the improvement of farmland microclimate , The effect of maintaining food and ecological safety

Active Publication Date: 2015-07-29

TIANJIN JINSHENGHUI TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0004] At present, according to the different methods and principles used in the remediation technology of soil heavy metal pollution, there are usually two main ways to control soil heavy metals: ① Change the existing form of heavy metals in the soil to make them fixed, thereby reducing their migration in the environment However, in a wide range of natural and variable environmental factors, as long as the soil heavy metals that have been changed in form still exist, it i...

Method used

(3) lay one deck water-permeable non-woven fabric on filter material laye...

Abstract

The invention belongs to the technical field of in-situ removal of heavy metal pollution of farmland soil environments, and discloses an enriching and transformation ditch device of a protection forest for removal of farmland heavy metals. The enriching and transformation ditch device comprises blind pipes, a water collecting settlement pool ditch, an enriching and transformation island and forest trees, wherein the blind pipes are used for draining the soil spraying water; the enriching and transformation island is built by an enriching and transformation box; the enriching and transformation box sequentially comprises a soil bearing layer, a water permeating filtering layer and a filtering material layer from top to bottom. The enriching and transformation ditch device has the characteristics that the heavy metal pollution of the soil can be efficiently recovered in an in-situ way within the larger range, the heavy metal is enriched and transformed to a wood production terminal, and the problems of secondary pollution and food safety are solved; the advantages of land saving, water saving, energy saving, material saving and farmland sustained ecological growth maintaining are realized; the enriching and transformation ditch device is used as an all-in-one facility for the basic construction of farmland forest nets (islands) and irrigation farmlands, and is also used as an important device for realizing multiple functions, such as basic construction of the farmlands, improving of the small climate of the farmlands, and realizing a wood production base.

Application Domain

Contaminated soil reclamation

Technology Topic

Wood productionEnvironment of Albania +9

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Examples

Experimental program(1)

Example Embodiment

[0023] Example 1

[0024] In this embodiment, the shelterbelt enrichment conversion ditch device is assembled in a farmland drainage ditch or in a low-lying land, and is built by combining the farmland irrigation and drainage network. Specific steps are as follows:

[0025] (1) Use farmland drainage ditches or low-lying land to construct catchment sedimentation tank ditches 9, such as figure 1 with figure 2 As shown, the two sides are farmland 2 and soil 7. The farmland irrigation canal system is used to add acid-producing food processing waste liquid or aquaculture wastewater into the water flow of the irrigation canal, and the irrigation water is evenly irrigated to the farmland contaminated by heavy metals. Perform leaching, melting and washing, and then use the blind pipe 1 buried in the farmland to introduce the washing water from the farmland 2 into the catchment sedimentation tank 9.

[0026] (2) The enrichment transformation island is set in the center of the catchment sedimentation tank 9 and consists of a single row or multiple rows of enrichment transformation boxes 3, and the enrichment transformation box 3 is a trapezoidal box body made of ABS engineering plastics.

[0027] The water-facing side of the enrichment transformation box 3 is a trapezoidal slope, and the connecting surface is a vertical surface. The enrichment transformation box 3 is provided with uniform permeable holes 8 around the enrichment transformation box 3, and the aperture of the permeable holes 8 is set to 1.0 mm to make the catchment sedimentation tank The rinsing water in the trench 9 can completely enter the enrichment conversion box 3. The trapezoid bottomless big mouth faces downwards, the top small mouth with planting holes 10 faces upwards, and then the trapezoidal enrichment conversion box 3 is filled with filter material to a height of 30-40 cm above the normal water level as the filter material layer 5. Use the modified fluidized bed slag, pottery, tile, porcelain, coal-fired slag particles and other wastes, and spray purified bacteria liquid and animal egg liquid during the filling process.

[0028] (3) A layer of permeable non-woven fabric is laid on the filter material layer 5 as the permeable filter layer 4 to prevent soil from leaking.

[0029] (4) Trees with soil balls are planted on the top of the permeable filter layer 4 according to the number of planting holes 10, and then soil is added as the soil pressure-bearing layer 6 of the forest.

[0030] (5) The number of planting holes 10 on the trapezoidal small opening with the top of the enrichment transformation box 3 should be at least 3, the hole shape is square or round, the side length or diameter is 35-110 cm, and more than 2 rows of trees are planted. At the same time, two rows of trees are planted on each side of the farmland 2 slope of the catchment sedimentation tank 9 to form a mixed deciduous and evergreen arbor forest.

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