Rapid purifying apparatus for irrigation water with cadmium pollution used before irrigation and method thereof

Abstract

The invention discloses a rapid purifying apparatus for irrigation water with cadmium pollution used before irrigation and a method thereof. The rapid purifying apparatus comprises the following components: a housing, which is provided with a water inlet and a water outlet; a purifying material layer comprising one layer or two layers, which is formed by a purifying medium filled in the housing and is located between the water inlet and the water outlet, and irrigation water flows into the water inlet is purified by the purifying material layer and flows out from the water outlet; the purifying medium comprises iron oxide particles, rape straws, and limestone particles or zeolite particles or both of the particles. The invention can effectively reduce content of heavy metal cadmium in irrigation water.

Description

technical field [0001] The invention relates to the technical field of water purification, in particular to a rapid purification device and method for cadmium-contaminated irrigation water before entering the field. Background technique [0002] Heavy metal cadmium pollution in farmland soil is the result of the combination of exogenous cadmium increase and soil degradation. However, once exogenous cadmium enters the soil, the cost of restoration and the difficulty of treatment are extremely high. The heavy metal cadmium in polluted soil is easily absorbed by plants, resulting in excessive cadmium content in agricultural products, which will directly pose a threat to my country's food security and food hygiene. Cadmium migrates actively in the environment and can enter the human body through food chains and drinking water, threatening human health. Therefore, soil cadmium pollution control should be placed in the soil-plant-management collaborative governance system, so th...

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Problems solved by technology

Among them, the precipitation method has a large disturbance to the water body, and the co-precipitation separation is difficult and the cost is high; the material cost and operation cost of the ion exchange method and the membrane treatment method are expensive, and the purification efficiency is poor in low-cadmium sewage, and the equipment maintenance is difficult; The chemical method consumes a lot of energy, and the farmland conditions cannot be met; the biological method has a large amount of engineering, complex procedures, takes up a lot of land, and takes a long time. Improper disposal of biological residues has the risk of secondary pollution, and it is difficult to achieve scale; the purification method has many control conditions, Difficulty in actual operation

In short, the existing sewage cadmium purification technology is difficult to directly apply to irrigation sewage

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