A method for remediating heavy metal pollution in rice farmland

Abstract

The invention discloses a method for repairing heavy metal pollution in rice farmland, belonging to the technical field of heavy metal treatment in farmland, comprising the following steps: S1: preparation of medicament; S2: loading the medicament configured in S1 into an adsorption ball, and loading the adsorption ball into a medicine bag The heavy metal adsorption device made in China; S3: when the rice seedlings are sown, the heavy metal adsorption device in S2 is implanted in the mud until it is just buried; S4: the agent is recovered, and the heavy metal adsorption device is taken out from the soil when the rice is harvested; S5: The adsorbed drug particles in S4 are dried in the sun until they are completely dry, so as to realize the recycling of waste resources. The diatomaceous earth component is added to the medicament of the present invention, so that the medicament has better adsorption effect. The present invention adopts the in-situ restoration method, and the heavy metals can be separated from the farmland soil by the adsorbed medicine particles, and can be taken out from the farmland soil together with the crops during the harvest season of the crops, which solves the problem that the heavy metal pollution in the farmland is not easy to handle, and will not destroy The original organic structure of the soil.

Description

technical field [0001] The invention belongs to the technical field of heavy metal treatment in farmland, and in particular relates to a method for repairing heavy metal pollution in rice farmland. Background technique [0002] Existing chemical remediation technologies mainly include 1. Ex-situ chemical leaching method - for soil heavily polluted by heavy metals in farmland, the soil is dug out first, and then the heavy metals are removed by large-scale spray chemical washing methods, and then the soil is backfilled in situ , this method involves high cost due to transportation and other methods, and the original organic matter structure of the soil will be destroyed after the soil is chemically washed, which will greatly change the properties of the farmland soil. 2. In-situ solidification / passivation method - the use of solidification passivation materials for heavy metal pollutants in farmland can reduce the activity of heavy metals in the soil, without affecting the gro...

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Problems solved by technology

[0002] Existing chemical remediation technologies mainly include 1. Ex-situ chemical leaching method - for soil heavily polluted by heavy metals in farmland, the soil is dug out first, and then the heavy metals are removed by large-scale spray chemical washing methods, and then the soil is backfilled in situ , this method involves high cost due to transportation and other methods, and the original organic matter structure of the soil will be destroyed after the soil is chemically washed, which will greatly change the properties of the farmland soil

2. In-situ solidification / passivation method - the use of solidification passivation materials for heavy metal pollutants in farmland can reduce the activity of heavy metals in the soil, without affecting the growth of crops or making the heavy metal residues in the fruits of agricultural products lower than the national standards. This method does not reduce the heavy metal content in the soil, and changes with time, climate, and geographical conditions, and may re-change the form of heavy metal ions and affect the growth of subsequent crops and food security.

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