An in-situ long-term remediation material for lead and cadmium composite polluted soil
A technology of composite pollution and repair materials, applied in the field of environmental governance, can solve problems such as pollution concealment, nutritional imbalance, crop yield and quality decline, etc.
Active Publication Date: 2021-02-23
SICHUAN UNIV
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Problems solved by technology
This type of pollution has a wide range, long duration, hidden pollution, and cannot be biodegraded, which will lead to soil degradation, decline in crop yield and quality, and pollute surface water and groundwater through runoff and leaching.
Excessive heavy metals will have adverse effects on plant physiological functions, making it nutritionally imbalanced
Method used
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[0044] The following 5 groups of experiments are set up in Table 1 to further illustrate the present invention, but the present invention is not limited thereto. Experiment 1 was carried out according to the following steps [1] and [5], Experiment 2 and Experiment 4 were carried out according to the following steps [1], [2], [4], [5] respectively, and Experiment 1 and Experiment 3 were carried out according to the following steps [1], [2], [3], [4], [5] conduct experiments.
[0045] Table 1 Experimental design
[0046]
[0047] Experimental method steps:
[0048] [1] Prepare 10 kg of contaminated soil with a lead content of 5.0 mg / kg and a cadmium content of 5.0 mg / kg, and place it in a flower pot with a sealed bottom, a diameter of 30 cm at the top, and a height of 50 cm.
[0049] [2] Weigh the corresponding quality materials according to the above table, mix them evenly, and form granules with a diameter of about 4mm after high-pressure extrusion granulation (compression ...
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Abstract
This application provides an in-situ long-term restoration material for lead and cadmium compound polluted soil, including three materials for repairing lead and cadmium compound pollution; one is composed of a matrix that adsorbs lead and cadmium; A kind of particulate matter coated with a short-term degradable film for the matrix of the substrate; a particulate matter coated with a long-term degradable film for the substrate capable of adsorbing lead and cadmium. The in-situ long-acting repair materials for lead and cadmium composite polluted soil provided by this application will take effect immediately after application without film wrapping, and the validity period is 3-6 months; the materials wrapped with polyester film will remain in the soil for 3 ‑6 months, the material begins to degrade, and the material begins to take effect; after coating, the material wrapped in polyester film begins to degrade in 12‑18 months in the soil, and the material begins to take effect, and the long-term pollution control material has been realized on the whole. effect.
Description
technical field [0001] The invention relates to the technical field of environmental treatment, in particular to an in-situ long-term restoration material for lead and cadmium compound polluted soil. Background technique [0002] Soil is the natural environment on which human beings depend and an important resource for agricultural production. Food, resources and environment soil heavy metal pollution that the world is facing refers to pollution caused by excessive accumulation of heavy metals in soil. Heavy metals in contaminated soil include elements with significant biological toxicity such as Cd, Pb, Hg, Cr, As, and elements with certain toxicity such as Cu, Zn, Ni. This type of pollution has a wide range, long duration, hidden pollution, and cannot be biodegraded, which will lead to soil degradation, decline in crop yield and quality, and pollute surface water and groundwater through runoff and leaching. Excessive heavy metals will have adverse effects on plant physio...
Claims
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IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 孙海龙苟敏刘志斌李乃稳李绍才王丽
Owner SICHUAN UNIV