Method for efficient removal of heavy metals in farmland irrigation water by plant pond, constructed wetland and adsorption tank

A technology for artificial wetlands and farmland irrigation, which is applied in the field of agriculture and farmland, can solve the problems of variable water quality, large demand, and complicated pollution sources, and achieve the effect of reducing heavy metal content and strong cadmium absorption capacity

Inactive Publication Date: 2017-07-25
HUNAN AGRICULTURAL UNIV
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Problems solved by technology

[0002] Farmland irrigation water has special uses, complex sources of pollution, wide range of pollution, variable water quality, low content of heavy metals, and large and concentrated demand. The purification process must be green, environmentally friendly, fast, efficient, and low-cost. Some of the heavy metal sewage purification facilities, processes, materials and technologies are not suitable for the purification of heavy metal pollution in farmland irrigation water

Method used

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  • Method for efficient removal of heavy metals in farmland irrigation water by plant pond, constructed wetland and adsorption tank
  • Method for efficient removal of heavy metals in farmland irrigation water by plant pond, constructed wetland and adsorption tank
  • Method for efficient removal of heavy metals in farmland irrigation water by plant pond, constructed wetland and adsorption tank

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Effect test

Embodiment 1

[0031] The pH value of farmland irrigation water in a certain place was 5.90-6.80, with an average of 6.49; the total cadmium content was 7.47-26.32 µg / L, with an average of 13.92 µg / L; the proportion of days exceeding the standard reached 77.8%.

[0032] Such as figure 1 As shown, the present invention adopts the method for efficiently removing heavy metals in farmland irrigation water to purify this farmland, specifically comprising the following steps:

[0033] 1) According to the distribution of farmland irrigation canals, select fields that can use the elevation difference to realize natural water inflow and outflow;

[0034] 2) Select the field with the highest water yield to build a secondary plant pond, which includes the first plant pond 1 and the second plant pond 2;

[0035] Such as figure 2 As shown, the first and second plant ponds 1 and 2 are artificial soil ponds, the bottom 11 of the pond is compacted with plain soil, the four walls 12 are soil walls or bric...

Embodiment 2

[0047] This embodiment is roughly the same as Embodiment 1, except that Figure 5 As shown, the constructed wetland 3 adopts the first-order surface flow constructed wetland.

[0048] Such as Figure 8 - Figure 9 As shown, the adsorption pool 4 adopts the water inlet and outlet on the surface, that is, the water inlet 41 and the water outlet 42 are distributed on the liquid surface of the pool body with a certain height difference, and the middle of the adsorption pool 4 is provided with a baffle 46 .

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Abstract

The invention discloses a method for efficient removal of heavy metals in farmland irrigation water by a plant pond, a constructed wetland and an adsorption tank. The method is mainly characterized in that farmland in which natural water inlet and outlet can be realized by difference of elevation is selected according to farmland irrigation ditch distribution conditions to form a 'plant pond, constructed wetland and adsorption tank' integrated purification process, aquatic plants such as typha and hydrilla are planted in the plant pond and the constructed wetland, and the adsorption tank is filled with industrial and agricultural wastes such as straws high in heavy metal adsorption capacity to purify heavy metal pollution in the farmland irrigation water. The aquatic plants can not only prevent short circuit of water flow but also improve purification efficiency; the adsorption tank can further improve purification efficiency to guarantee that heavy metals in the farmland irrigation water reach the standard. By adoption of the method, heavy metal pollution in the farmland irrigation water can be efficiently eliminated while pollution of N, P and the like can be cleared, and the heavy metal content of the farmland irrigation water can reach the standard all year round.

Description

technical field [0001] The present invention relates to farmland irrigation water purification technology, in particular to a method for efficiently removing heavy metals in farmland irrigation water by using plant ponds + artificial wetlands + adsorption ponds. Plants, floating plants, submerged plants) and straw and other safe, cheap, easy-to-get, high-efficiency, and strong cadmium-absorbing industrial and agricultural wastes are used to construct a purification process of plant ponds + artificial wetlands + adsorption pools. Background technique [0002] Farmland irrigation water has special uses, complex sources of pollution, wide range of pollution, variable water quality, low content of heavy metals, and large and concentrated demand. The purification process must be green, environmentally friendly, fast, efficient, and low-cost. Some heavy metal sewage purification facilities, processes, materials and technologies are not suitable for the purification of heavy me...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/281C02F1/286C02F3/32C02F9/00C02F2101/20C02F2301/08
Inventor 魏祥东杨登邹慧玲尹晓辉陈楠张昊杨慧敏铁柏清刘孝利
Owner HUNAN AGRICULTURAL UNIV
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