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Reinforced plant restoration method for lead-cadmium composite contaminated soil

A technology for compound pollution and phytoremediation, applied in the field of using dissolved organic matter to enhance phytoremediation of soil lead and cadmium, can solve the problems of affecting phytoremediation effect, difficult degradation of chelating agents, and reducing plant biomass, etc., so as to improve bioavailability. , strong practical application potential, obvious effect of strengthening effect

Inactive Publication Date: 2015-05-13
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

However, there are still many problems in chelation-enhanced restoration technology: first, although chelating agents can increase the content of heavy metals in plants, chelating agents will inhibit plant growth, reduce plant biomass, and affect the effect of phytoremediation; secondly, most chelating agents are not easy to degrade , can easily lead to the infiltration of heavy metals, which is likely to cause potential pollution to the ecological environment, especially groundwater; again, the price of chelating agents is relatively high, and a large amount of use will inevitably increase the cost of phytoremediation

Method used

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  • Reinforced plant restoration method for lead-cadmium composite contaminated soil
  • Reinforced plant restoration method for lead-cadmium composite contaminated soil
  • Reinforced plant restoration method for lead-cadmium composite contaminated soil

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Experimental program
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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the embodiments.

[0028] (1) Potted plant concentration gradient experiment

[0029] The potted planting experiment site was on the campus of Shaanxi University of Science and Technology, and it was cultivated outdoors. There is no pollution source around the experimental site. The area belongs to the warm temperate semi-humid monsoon climate. The annual average temperature is 9-19℃, the frost-free period is 208-230 days, and the annual precipitation is 500-750mm. The pot experiment was collected from the surface soil of the school (0-20cm). ), the basic physical and chemical properties of the soil are shown in Table 1.

[0030] Table 1 Basic physical and chemical properties of soil

[0031]

[0032] A total of 10 concentration gradients were set up in this experiment (Table 2), and the forms of Pb and Cd added in the experiment were Pb(NO 3 ) 2 , CdCl 2 ·2.5H 2 O, is an analytical reagent. Take an app...

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Abstract

The invention provides a reinforced plant restoration method for lead-cadmium composite contaminated soil. The reinforced plant restoration method comprises the following steps: planting restoration plants in lead-cadmium composite contaminated soil, and injecting a DOM (dimethoxymethylamphetamine) solution into the soil within a restoration period according to soil moisture holding capacity which accounts for 60%-70% of the soil field moisture holding capacity. According to the reinforced plant restoration method disclosed by the invention, the DOM is from a mixed solution of soil leaching liquor and a straw humifying solution, and the reinforcing effect is mainly from activation effect of the DOM solution to lead / cadmium; the effect of restoring the lead / cadmium composite contaminated yellow soil is improved by changing the bio-availability of the lead / cadmium in soil through DOM.

Description

Technical field [0001] The invention relates to a phytoremediation technology for heavy metal compound contaminated soil, in particular to a method for enhancing phytoremediation of soil lead and cadmium by using dissolved organic matter. Background technique [0002] Soil is an important resource for human survival in the natural environment and agricultural production. With the development of industry and agriculture and the acceleration of urbanization, the discharge of heavy metal pollutants is increasing day by day. Heavy metal pollution can seriously interfere with the normal function of the soil ecosystem, which not only reduces the yield and quality of agricultural products, but also indirectly harms human health through the food chain cycle. Lead (Pb) and cadmium (Cd) are heavy metal pollutants widely distributed in farmland soils in my country. They are highly toxic and accumulative, and have teratogenic, carcinogenic, and mutagenic effects on organisms. At present, th...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 范春辉
Owner SHAANXI UNIV OF SCI & TECH
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