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In-situ remediation agent for low heavy metal pollution of greenhouse vegetable land as well as preparation and application methods of in-situ remediation agent

An in-situ remediation agent and technology for vegetable fields, which are applied in land preparation methods, restoration of polluted soil, chemical instruments and methods, etc., can solve the problems of waste of resources, environmental hazards, inability to fully utilize the active ingredients of crab shells, etc. The effect of migration, low synthesis cost, stable and reliable preparation process

Inactive Publication Date: 2020-11-10
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, the utilization of shrimp and crab shells is limited, and most of them are treated as garbage, which has potential harm to the environment in the long run, and causes serious waste of resources; some methods of recycling crab shells only use calcium carbonate in crab shells Transformation of hydroxyapatite, or conversion of chitosan with only chitin as the active ingredient, cannot fully utilize the active ingredient in crab shells

Method used

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  • In-situ remediation agent for low heavy metal pollution of greenhouse vegetable land as well as preparation and application methods of in-situ remediation agent
  • In-situ remediation agent for low heavy metal pollution of greenhouse vegetable land as well as preparation and application methods of in-situ remediation agent
  • In-situ remediation agent for low heavy metal pollution of greenhouse vegetable land as well as preparation and application methods of in-situ remediation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] An in-situ remediation agent for low-level heavy metal-contaminated soil of facility vegetables, the remediation agent is prepared by mixing, heating, reacting, and drying shrimp and crab shell extracts and alum slurry powder. The shrimp and crab shell extract is prepared from shrimp shells and crab shells through pickling and alkali washing processes in sequence.

[0049] A method for preparing an in-situ remediation agent for low-level heavy metal-contaminated soil in protected vegetable fields, said method comprising the following steps:

[0050] (1) Prepare alum slurry powder;

[0051] (2) Prepare shrimp and crab shell extract;

[0052] A1, pretreatment, removing impurities such as meat and dirt from shrimp and crab shells, washing with water, and drying;

[0053] A2, pickling process, put the pretreated shrimp and crab shells in dilute hydrochloric acid to react, then filter and wash to neutrality;

[0054] A3, alkali washing process, the shrimp and crab shells ...

Embodiment 2

[0069] Embodiment 2: the effect of applying in-situ restoration agent in the field to produce cherry tomatoes

[0070] In conjunction with Example 1, the application method of the in-situ remediation agent for low-level heavy metal-contaminated soil in the facility vegetable field: after the crop vegetables are harvested in the soil to be repaired, the remediation agent is applied to the soil of the facility vegetable greenhouse in an amount of 50 kg / mu. Deep plow, water, and keep the soil moist for 2 weeks, and do not apply chemical fertilizers during the application of the restoration. Two weeks later, the crops can be planted and managed according to conventional methods, and cherry tomatoes can be planted. The experimental results show that the heavy metals (Cd, Pb, Zn, Cu, Ni) in cherry tomato fruits are all lower than the Chinese food pollutant limit standard value (food Medium pollutant limit standard GB2762-2012) to achieve the purpose of safe production.

Embodiment 3

[0071] Embodiment 3: the effect of applying in-situ restoration agent to produce cucumber in the field

[0072] In conjunction with Example 1, the application method of the in-situ remediation agent for low-level heavy metal-contaminated soil in the facility vegetable field: after the soil to be repaired is harvested as the stubble vegetables, the remediation agent is applied to the facility vegetable greenhouse for planting cucumbers at a rate of 80 kg / mu. In the soil, plow deeply, water, and keep the soil moist for 2 weeks, and no chemical fertilizers can be applied during the application of the restoration agent. Two weeks later, the crops can be planted and managed according to conventional methods, and cucumbers can be planted. The experimental results show that the heavy metals (Cd, Pb, Zn, Cu, Ni) in cucumbers are all lower than the Chinese food pollutant limit standard value (food pollutants Limit standard GB2762-2012) to achieve the purpose of safe production.

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Abstract

The invention provides an in-situ remediation agent for low heavy metal contaminated soil of a greenhouse vegetable field and preparation and application methods thereof, and belongs to the technicalfield of soil in-situ remediation, and the remediation agent provided by the invention is prepared by mixing shrimp and crab shell extract and alum slurry powder, heating, reacting and drying. The invention mainly aims at the characteristic of low heavy metal pollution intensity of facility vegetable fields in China, and provides a special in-situ remediation agent for low heavy metal pollution facility vegetable field soil, which is rich in raw materials, low in cost, simple in production process, high in remediation efficiency and free of secondary pollution, and preparation and applicationmethods thereof.

Description

technical field [0001] The invention relates to the technical field of in-situ remediation of soil, in particular to an in-situ remediation agent for low-level heavy metal-polluted soil of facility vegetables and a preparation and application method thereof. Background technique [0002] The status quo of heavy metal pollution in farmland soil in some areas of my country is relatively serious, resulting in excessive heavy metal content in agricultural products and endangering human health. At the same time, my country has a large population and little land. In order to ensure food security, it is still necessary to safely use moderately and lightly polluted farmland and produce safe agricultural products. In 2016, the State Council issued the Action Plan for the Prevention and Control of Soil Pollution, which requires that by 2020 and 2030, the safe utilization rate of polluted cultivated land will reach about 90% and over 95%, respectively. Therefore, the remediation and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40A01B79/02B09C1/08B09C1/00C09K109/00C09K101/00
CPCA01B79/02B09C1/00B09C1/08C09K17/40C09K2101/00C09K2109/00
Inventor 李凝玉吴长兴陈丽萍郭彬李华傅庆林
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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