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A method for remediating heavy metal micro-pollution in vegetable field soil

A heavy metal and micro-pollution technology, applied in the restoration of polluted soil, etc., can solve the problems of sustainable utilization and the impact on the quality of agricultural products, reduce the total amount of heavy metals and bioavailability, etc., to reduce the risk of secondary pollution and increase The effect of soil carbon sequestration efficiency and difficulty in secondary pollution

Active Publication Date: 2016-08-17
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to reduce the total amount of heavy metals and bioavailability in the soil of facility vegetable fields, and solve the impact of heavy metal pollution on the soil of facility vegetable fields on its sustainable use and the quality of agricultural products

Method used

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  • A method for remediating heavy metal micro-pollution in vegetable field soil
  • A method for remediating heavy metal micro-pollution in vegetable field soil
  • A method for remediating heavy metal micro-pollution in vegetable field soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, ryegrass is perennial ryegrass; biochar is a solid product obtained by pyrolysis and carbonization of bamboo processing residues, straw, rice husks and other agricultural organic wastes at 500-700°C under anaerobic conditions. Crushed by machine, passed through 20 mesh sieve. pH=10.47, TC is 255.80g / kg, DOC is 0.88g / kg, TN is 1.48g / kg; the organic fertilizer is pig manure and rice husk compost, produced by Hangzhou Lvbao Organic Fertilizer Co., Ltd. pH=7.30, TC is 243.30 g / kg, DOC is 3.57 g / kg, TN is 2.61 g / kg.

[0037] The soil was taken from Fuyang acidic red loam in Hangzhou, Zhejiang. The soil samples were collected and air-dried, then ground with a wooden rolling pin and passed through a 6 mm sieve. After testing, the content of copper and cadmium in the tested soil is 1.34-3.68% higher than the secondary standard of "Soil Environmental Quality Standard GB15618-2008", the Nimerow index is 0.74 and 1.02 respectively, and the proportion of effectiv...

Embodiment 2

[0042] The soil was taken from the acidic mountain fluvo-aquic soil in Lin'an, Hangzhou, Zhejiang, and the other materials used were the same as in Example 1. . The soil samples were collected and air-dried, then ground with a wooden rolling pin and passed through a 6 mm sieve. After testing, the content of lead, chromium and cadmium in the tested soil was 7.13-9.02% higher than the secondary standard of "Soil Environmental Quality Standard GB15618-2008", the Nimerow index was 1.03, 0.73 and 1.09 respectively, and the proportion of effective state was 22.39~27.75﹪. Plant ryegrass and do pot experiments. The diameter of the flowerpot is 12cm, and the seeding rate of ryegrass is 40g / m 2 , that is, 0.45g / pot, harvested when the height of ryegrass is greater than 25 cm. After testing, the content of lead, chromium and cadmium in the test soil at this time complied with the secondary standard of "Soil Environmental Quality Standard GB15618-2008", but the Nimerow index of lead a...

Embodiment 3

[0047] The soil was taken from acidic mountain red loam in Jiande, Hangzhou, Zhejiang, and the other materials used were the same as those in Example 1. The soil samples were collected and air-dried, then ground with a wooden rolling pin and passed through a 6 mm sieve. After testing, the content of lead and cadmium in the tested soil is 7.75-19.26% higher than the secondary standard of "Soil Environmental Quality Standard GB15618-2008", the Nimerow index is 0.77 and 1.73 respectively, and the proportion of effective state is 25.42-46.72% . Plant ryegrass, the seeding rate of ryegrass is 40g / m 2 , that is, 0.45g / pot, harvested when the height of ryegrass is greater than 25 cm. After testing, the content of lead and cadmium in the soil to be tested at this time is still higher than the second-level standard of "Soil Environmental Quality Standard GB15618-2008". The extractable content of heavy metal lead and cadmium in the soil is measured, and it is calculated to account for...

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Abstract

The invention discloses a method for remedying heavy metal micro-contamination of facility vegetable field soil. Through phytoremediation on heavy metal micro-contamination soil of a facility vegetable field by using ryegrass, the total amount of heavy metals in the soil is reduced; in the normal vegetable growing process, the biological effectiveness of the heavy metals in the soil of the facility vegetable field is reduced by using charcoal; the charcoal is a solid product produced by performing pyrolysis carbonization at 500-700DEG C on bamboo processing residues, straws, rice husks and other agricultural organic wastes under an hypoxic condition, crushing by a crusher and sieving by a 20-mesh sieve. The method is economical, effective, and easy to implement; by the method, secondary pollution is unlikely caused and raw materials are abundant and low in cost; the method is not only applicable to vegetable companies, but also to the farmer homes; according to the actual contamination situation and the phytoremediation effect, the application amount of the charcoal and the organic fertilizer are adjusted, so that the soil heavy metal remedying effect is improved and the cost is reduced; while the remediation of heavy metal contamination is achieved, the soil quality is improved and natural circulation of farmland nutrients is promoted.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration of heavy metal soils, and relates to a method for repairing micro-polluted heavy metal soil of vegetable land in facilities, specifically a method for ryegrass phytoremediation combined with biochar passivation to treat micro-polluted soil with heavy metals in vegetable land in facilities. technical background [0002] As an important part of agricultural products, vegetables are an indispensable necessity for people's life. The production of high-quality and safe vegetables is one of the important signs that the urban vegetable basket project has reached a new level. In recent years, with the adjustment of agricultural structure in our country, the cultivation of protected vegetables has developed rapidly, and the reports on soil barrier factors of protected vegetable fields are increasing day by day. Among them, the heavy metal pollution of the soil environment has attracted the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 宁皎莹和苗苗周根娣
Owner HANGZHOU NORMAL UNIVERSITY
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