Method for repairing cadmium-polluted soil

A technology for cadmium-contaminated soil and soil, which is applied in the field of heavy metal pollution restoration in soil, can solve problems such as the impact of intensification effect and difficulty in guiding field restoration practices, and achieve low cost, broad application prospects and market space, and obvious effect of cadmium restoration

Pending Publication Date: 2019-11-08
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inoculation of strains does not necessarily improve the heavy metal accumulation capacity of all plants, and the reinforcement methods and specific conditions will also affect each other, which will have a huge impact on the final reinforcement effect
In addition, the current research on the effect of microorganisms on phytoremediation is mostly pot experiments in the laboratory, and the experimental results are often quite different from the results of field restoration in the field, so it is difficult to guide field restoration practice

Method used

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  • Method for repairing cadmium-polluted soil
  • Method for repairing cadmium-polluted soil
  • Method for repairing cadmium-polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for repairing cadmium-contaminated soil of the present embodiment may further comprise the steps:

[0037] Step 1: sow the seeds of Lily chinensis in the cadmium-contaminated soil with a total cadmium content of 3.52 mg / kg. The seeds of Cedarweed were collected in Shangdengyuan Village, Dabu Township, Yanshan District, Guilin City, Guangxi. First, sterilize the seeds with 70wt% ethanol for 1min, then mix the sterilized seeds and sand at a mass ratio of 1:1, sow in drill with a row spacing of 30cm and a plant spacing of 30cm, sow in ditches, and then cover with soil 0.5 cm. Routine management is carried out, and the seedlings are thinned out when the green squid grows to 6 cm.

[0038]Step 2: In the 5th month of step 1 sowing the quince seeds, evenly spread ammonium chloride and citric acid in the cadmium-contaminated soil of step 1, so that the concentration of ammonium chloride in the cadmium-contaminated soil is 180mg / kg, lemon The concentration of the a...

Embodiment 2

[0041] The method for repairing cadmium-contaminated soil of the present embodiment may further comprise the steps:

[0042] Step 1: Sow the seeds of Lily chinensis in the cadmium-contaminated soil with a total cadmium content of 3.68mg / kg. The seeds of Cedarweed were collected in Shangdengyuan Village, Dabu Township, Yanshan District, Guilin City, Guangxi. First, sterilize the seeds with 70wt% ethanol for 1min, and then mix the sterilized seeds and sand at a mass ratio of 1:1. cm. Routine management is carried out, and the seedlings are thinned out when the green squid grows to 6.5 cm.

[0043] Step 2: in the 5th month of step 1 sowing the quince seeds, evenly spread ammonium chloride and citric acid in the cadmium-contaminated soil of step 1, so that the concentration of ammonium chloride in the cadmium-contaminated soil is 190mg / kg, lemon The concentration of the acid was 5 mmol / kg, and at the same time, 20 mL of Bacillus megaterium bacterium liquid was injected into the...

Embodiment 3

[0046] The method for repairing cadmium-contaminated soil of the present embodiment may further comprise the steps:

[0047] Step 1: Sow the seeds of Lily chinensis in the cadmium-contaminated soil with a total cadmium content of 3.72 mg / kg. The seeds of Cedarweed were collected in Shangdengyuan Village, Dabu Township, Yanshan District, Guilin City, Guangxi. First, sterilize the seeds with 70wt% ethanol for 1 min, then mix the sterilized seeds and sand at a mass ratio of 1:1, sow in drill, with a row spacing of 30cm and a plant spacing of 50cm, sow in ditches, and then cover with soil 1cm . Routine management is carried out, and the seedlings are thinned out when the green squid grows to 7 cm.

[0048] Step 2: In the 5th month of step 1 sowing the quince seeds, evenly sprinkle ammonium chloride and citric acid in the cadmium-contaminated soil of step 1, so that the concentration of ammonium chloride in the cadmium-contaminated soil is 200mg / kg, lemon The concentration of th...

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Abstract

The invention discloses a method for repairing cadmium-polluted soil, and belongs to the technical field of soil heavy metal pollution repairing. The method for repairing the cadmium-polluted soil comprises the following steps: step 1, sowing feather cockscomb seeds in cadmium-polluted soil, and carrying out conventional management; step 2, uniformly spreading ammonium chloride and citric acid into the cadmium-polluted soil in the fifth month after the feather cockscomb seeds are sown, and simultaneously injecting a bacillus megaterium bacterial solution to rhizosphere soil of each feather cockscomb plant; and step 3, harvesting roots, stems and leaves of the feather cockscomb in the sixth month after the feather cockscomb seeds are sown to obtain repaired soil. According to the method, feather cockscomb is used as a cadmium superaccumulation plant, the ammonium chloride is used for improving cadmium enrichment in the feather cockscomb, the citric acid is used for improving repairing efficiency of the feather cockscomb, and the bacillus megaterium bacterial solution is used as an inoculant. Through the synergistic effect of the feather cockscomb, the ammonium chloride, the citric acid and the bacillus megaterium, repairing efficiency of the feather cockscomb on cadmium-polluted farmland soil is greatly improved.

Description

technical field [0001] The invention relates to a method for repairing cadmium-contaminated soil, and belongs to the technical field of repairing soil heavy metal pollution. Background technique [0002] Cadmium (Cd) is one of the most prevalent pollutants in soil. According to the "National Soil Pollution Survey Bulletin" released in 2014, the excessive rate of soil cadmium sites in my country is the highest among all heavy metal pollutants. Compared with other heavy metal elements, cadmium has higher mobility and bioavailability, and is easy to threaten human health through the food chain, so this element is also considered to be one of the most harmful pollutants in soil. In the "Soil Pollution Prevention and Control Action Plan" (Soil Ten Articles) issued by the State Council on May 28, 2016, cadmium is also included as a key prevention and control target. It can be seen that the control and remediation of soil cadmium pollution has become a major strategic demand in m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 俞果刘杰傅校锋蒋萍萍林华陈喆游少鸿梁延鹏肖河
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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