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Method for efficiently removing heavy metals from farmland irrigation water by constructed wetland and adsorption pool

A technology for artificial wetlands and farmland irrigation, applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, water pollutants, etc. land area and construction cost, reducing heavy metal content and improving purification effect

Inactive Publication Date: 2017-08-29
HUNAN AGRICULTURAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 efficiently removing heavy metals from farmland irrigation water by constructed wetland and adsorption pool
  • Method for efficiently removing heavy metals from farmland irrigation water by constructed wetland and adsorption pool
  • Method for efficiently removing heavy metals from farmland irrigation water by constructed wetland and adsorption pool

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Experimental program
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Effect test

Embodiment 1

[0025] 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%.

[0026] Such as figure 1 As shown, the present invention adopts the method for efficiently removing heavy metals in farmland irrigation water to purify the cadmium pollution of farmland irrigation water, specifically comprising the following steps:

[0027] 1) According to the distribution of farmland irrigation canals, select fields that can use the elevation difference to realize natural water inflow and outflow;

[0028] 2) Select the above-mentioned fields with higher water yield to build a first-level artificial wetland 3, such as figure 2 - image 3 As shown, the constructed wetland 3 is a first-class subsurface flow constructed wetland, with a brick-concrete structure and a cement pool, length × width × height = 15 m × 15 m...

Embodiment 2

[0035] This embodiment is roughly the same as Embodiment 1, except that Figure 7 - Figure 8 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 efficiently removing heavy metals from farmland irrigation water by a constructed wetland and an adsorption pool. The method is a purification technology which selects field pieces capable of realizing natural water inlet and outlet through difference of elevation according to distribution cases of farmland irrigation canals and utilizes the selected field pieces to form a constructed wetland and an adsorption pool. In the constructed wetland, aquatic plants such as typha angustifolia and hydrilla are planted. The adsorption pool is filled with industrial and agricultural wastes such as straw having a high heavy metal adsorption capacity so that heavy metal pollutants in the farmland irrigation water are removed. The aquatic plants can prevent water flow short-out and improve the efficiency of purification. The adsorption pool can further improve the efficiency of purification and guarantee that heavy metal content of the farmland irrigation water reaches the standards. The method can efficiently remove heavy metal pollutants in the farmland irrigation water, remove N and P pollutants and guarantee that heavy metal content of the farmland irrigation water reaches the standards.

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 artificial wetland + adsorption pool, the core of which is to use aquatic plants (including emergent 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 artificial wetland + adsorption pool. 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 f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F1/28C02F101/20
CPCC02F1/288C02F3/32C02F3/322C02F2101/20Y02W10/10
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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