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Method for repairing heavy metal polluted farmland

A heavy metal and farmland technology, applied in the restoration of polluted soil, etc., can solve the problems of limited activation capacity of heavy metals, small plant biomass, increased carbon dioxide emissions, etc., achieve good social and environmental benefits, facilitate popularization and application, and increase production Effect

Active Publication Date: 2021-12-03
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The current heavy metal pollution control technologies in farmland mainly include physical methods, chemical methods, biological methods, and agronomic regulation, etc., which have disadvantages such as high cost, long cycle, and slow effect.
[0003] Since Chaney, R.L. et al. proposed the use of hyperaccumulative phytoremediation of heavy metal-contaminated soils, phytoremediation has become a research hotspot at home and abroad, but due to the shortcomings of small plant biomass, slow growth rate, and limited activation ability to heavy metals, its remediation efficiency is low. , it is difficult to remediate heavy metal-contaminated soil with a high degree of pollution. At the same time, how to dispose of heavy metal-enriched plants directly affects the remediation cost. The traditional incineration method requires expensive equipment and operating costs, wastes resources and increases carbon dioxide emissions, which restricts the economics of phytoremediation. One of the important factors of feasibility, it is urgent to develop resource utilization technology

Method used

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  • Method for repairing heavy metal polluted farmland
  • Method for repairing heavy metal polluted farmland
  • Method for repairing heavy metal polluted farmland

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11

[0017] Divide a piece of heavy metal polluted farmland (Cd content in soil is 3.3mg / kg; Pb content is 280mg / kg) divided into 20m*5m each test field. On April 3, 2019, Oasis No. 1 was planted uniformly, watered and passivating agent was applied the next day. On May 20, 2019, Oasis No. 1 grew to a height of about 1.0-1.3 meters. The first crop of tender grass was harvested, and the passivator was applied again the next day after watering. On June 15, 2019, Oasis No. 1 grew to a height of about 1.0-1.3 meters, and the second crop of tender grass was harvested. After ten days, water and apply plant growth regulator and surfactant at the same time, water again one month later and apply the same amount of plant growth regulator and surfactant, and harvest old grass at the end of December, 2019. The yields of the first young grass, the second young grass and the old grass were measured respectively and their lead and cadmium contents were determined.

[0018] According to the same ...

Embodiment 12

[0026] The synthetic method of embodiment 12 [2-(3,4-dichlorophenoxy)-ethyl] dodecyl diethylammonium bromide (DCPTA-12)

[0027] Add 50 g of [2-(3,4-dichlorophenoxy)-ethyl] diethylamine into 100 mL of ethyl acetate solution, then add 50 g of 1-bromododecane, heat to reflux for 6 hours, add petroleum jelly after cooling Ether was stirred, and the solid was filtered out, washed with petroleum ether and vacuum-dried to obtain the product [2-(3,4-dichlorophenoxy)-ethyl]dodecyldiethylammonium bromide 88g, yield 90% .

[0028] 1 HNMR (400MHz, CDCl 3 )δ7.37(d, J=9.2Hz, 1H), 7.05(d, J=2.8Hz, 1H), 6.91(dd, J 1 =9.2Hz,J 2 =3.2Hz,1H),4.59(t,J=4.6Hz,2H),4.20(t,J=4.4Hz,2H),3.66-3.60(m,4H),3.41-3.37(m,2H),1.79 (m,2H),1.48(t,J=7.2Hz,6H),1.38-1.26(m,18H),0.88(t,J=6.8Hz,3H);

[0029] 13 C NMR (100MHz, CDCl 3 )δ 155.9, 132.9, 130.8, 125.2, 116.7, 114.3, 62.6, 59.1, 57.1, 54.9, 31.7, 29.4, 29.2, 29.2, 29.1, 29.0, 26.3, 22.4, 22.1, 13.9, 8.2.

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Abstract

The invention belongs to the technical field of environmental protection, and relates to a method for repairing a heavy metal polluted farmland. According to the method, the phytoremediation technology and the chemical remediation technology are combined, and the technology and economic feasibility are improved through advantage complementation. Oasis No.1 fungus grass is planted in a farmland, wherein a passivating agent is applied in the early stage of growth of the Oasis No.1 fungus grass, absorption of the Oasis No.1 fungus grass to heavy metal is reduced, and tender grass is harvested for feed; besides, a surfactant and a plant growth regulator are applied in the later growth period of the Oasis No.1 fungus grass, so that the Oasis No.1 fungus grass is promoted to absorb heavy metals, meanwhile, the yield is increased, and old grass is harvested for building materials. Compared with the prior art, the repairing method can realize repairing while production, and has better technical and economic feasibility.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for repairing farmland polluted by heavy metals. Background technique [0002] Farmland heavy metal pollution is related to the quality and safety of agricultural products and the health of farmland ecosystems. It is a major environmental problem worldwide. Compared with water and air pollution, farmland heavy metal pollution has the characteristics of concealment, lag and accumulation, which is serious and difficult to reverse and recover. , seriously threatening the ecological environment, food security and human health. The current heavy metal pollution control technologies in farmland mainly include physical methods, chemical methods, biological methods and agronomic regulation, etc., which have disadvantages such as high cost, long cycle time, and slow effect. [0003] Since Chaney, R.L. et al. proposed the use of hyperaccumulative phytoremediation of...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/105B09C2101/00
Inventor 李中贤董学亮刘珂珂余学军宋跃刘小培靳瑞文王俊伟
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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