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Composite passivator for cadmium contaminated soil and application of composite passivator

A technology of soil passivation and passivating agent, which is applied in the field of soil remediation, can solve the problems that passivating agents cannot achieve the effect of soil remediation, and achieve the effects of not being easy to get diseases and insect pests, promoting plant growth, and preventing absorption

Active Publication Date: 2019-09-20
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the soil structure, a single passivator (such as inorganic passivator, organic passivator, or biological passivator) cannot achieve the ideal soil remediation effect.

Method used

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  • Composite passivator for cadmium contaminated soil and application of composite passivator
  • Composite passivator for cadmium contaminated soil and application of composite passivator
  • Composite passivator for cadmium contaminated soil and application of composite passivator

Examples

Experimental program
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Effect test

preparation example Construction

[0044] The soil passivation agent is compounded with carrier passivation materials (calcium citrate-iron-based materials and mercapto swelling materials) to prepare a soil composite passivation agent with nutrient slow-release effect. Concrete preparation method comprises the following steps:

[0045] 1. Preparation of calcium citrate iron-based materials

[0046] (1) Mix ferrous sulfate heptahydrate with anhydrous sodium carbonate and citric acid in a molar ratio of 1:1:1, adjust the pH to 7.0-8.0 with sodium hydroxide or calcium oxide, and obtain substance A.

[0047] (2) Mix citric acid and calcium oxide at a molar ratio of 2:3, adjust the pH to 7.0-8.0 with sodium hydroxide, wash with water, and filter to obtain white precipitate B.

[0048] (3) The substance A in the step (1) and the precipitate B in the step (2) are mixed in a mass ratio of 1:1 to 4, uniformly mixed, and dried to obtain a calcium citrate-iron-based material.

[0049] 2. Preparation of mercapto swelling...

Embodiment 1

[0063] Embodiment one: the preparation of soil passivation agent

[0064] The Pseudomonas is inoculated into the culture medium, and the culture medium composition is: KNO 3 1.0g, KH 2 PO 4 1.0g, MgSO 4 ·7H 2 O 1.0g, FeCl 3 ·6H 2 O 0.05g, CaCl 2 2H 2 O 0.2g, trisodium citrate 5.13g, distilled water 1000ml.

[0065] After culturing on a shaker at 30° C. and 150 rpm for 24 hours, the strains were activated. Transfer to a new medium according to the inoculum amount of 1%, and culture at 30° C. for another 24 hours to obtain a seed liquid.

[0066] The seed solution is inserted into a fermenter (containing a new medium) according to the inoculum amount of 1% to expand the culture, cultivated at 28° C. for 16 hours, and the resulting bacterial suspension is collected, which is the soil passivation agent.

Embodiment 2

[0067] Embodiment 2: Application of soil passivation agent (showing the effect of soil passivation agent improving cadmium-polluted water quality hydroponic wheat)

[0068] Greenhouse hydroponic experiments were carried out using the culture medium added with heavy metal Cd (5mg / L) as the substrate. After the wheat seeds were germinated in clear water and turned white, the seeds with normal germination and no significant difference between groups were selected and placed in the germination basket with colonized cotton, then the colonized cotton was soaked in the culture solution containing heavy metal Cd, and inserted into the 1 The soil passivating agent prepared by the embodiment one of %, as experimental group; Simultaneously with not adding soil passivating agent as control group, each experimental group establishes 4 repetitions; Simultaneously with the clear water containing the Cd of 5mg / L, as blank Group. The cultivation conditions in the greenhouse were 12 hours duri...

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Abstract

The invention belongs to the field of soil remediation, and particularly relates to a composite passivator for cadmium contaminated soil and application of the composite passivator. The composite passivator specifically comprises a soil passivating agent whose main active ingredient is pseudomonas. The composite soil passivator required can be made from the soil passivating agent and a carrier passivating material. The soil passivating agent and the composite soil passivator can passivate heavy metals in the soil to promote plant growth; the heavy metals can be blocked, the absorption of metal Cd by plants can be effectively stopped, and accordingly, heavy metal residues in crops are reduced. The composite passivator has great practical application value and promotion potential.

Description

technical field [0001] The invention belongs to the field of soil restoration, and in particular relates to a composite passivator for cadmium-contaminated soil and an application thereof. Background technique [0002] With the continuous development of industry, the problem of heavy metal pollution in soil, especially cadmium pollution, has become a hot spot that the whole society pays attention to. According to statistics, at present, my country's cadmium-contaminated farmland has exceeded 200,000 hectares, involving 25 regions in 11 provinces and cities, and 1.46 million tons of agricultural products with excessive cadmium content per year have seriously endangered people's health. Aiming at the problem of cadmium pollution in large-scale farmland in my country, it is urgent to develop a technical method that can be popularized in a large area, has low cost, and does not miss the time of farming, so as to reduce the bioavailability of cadmium in soil and reduce the conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10B09C2101/00
Inventor 何晓红陶勇李大平李铁柱
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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