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A method for strengthening phytoremediation of heavy metal-contaminated soil

A technology of contaminated soil and phytoremediation, applied in the field of environmental science, can solve the problems of high cost of use and difficulty in popularization and application, and achieve the effects of convenient management, shortened repair time, and cost savings

Inactive Publication Date: 2015-09-02
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Camellia oleifera (Camellia oleifera) and tea seed (Camellia sinensis) are rich in tea saponin, a natural surfactant, in tea seed meal after extracting vegetable oil. Our results show that Tea saponin has a strong potential to promote plant absorption and accumulation of heavy metals, but because high concentration tea saponin slightly inhibits plant growth, and the use cost is high, it is difficult to popularize and apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Evenly distribute 2200kg powdered tea seed meal to the 676 m 2 In the heavy metal compound polluted soil (about 213 tons, counting on 30cm topsoil), the soil is plowed and sugarcane is planted by conventional methods, and field management is carried out according to conventional agronomic technical measures after planting. The sucrose is used as the biomass energy material, the bagasse is used as the pulp, and the cane leaves are treated and disposed as solid waste. After one season of treatment, compared with no addition of tea seed meal, all the biomass of heavy metals cadmium, lead, copper, nickel and zinc in the soil, the sucrose in it was used as the biomass energy material, the bagasse was used as the pulp, and the cane leaves were pressed as solid The amount of waste removed increased by 272%, 265%, 152%, 221% and 85%, respectively.

Embodiment 2

[0020] Evenly distribute 4400kg powdered tea seed meal to 338m 2 In the heavy metal compound-contaminated soil (about 107 tons, calculated as 30cm topsoil), the soil was plowed by conventional methods and sugarcane was planted. After planting, field management was carried out according to conventional agronomic technical measures. After the sugarcane matured, the aboveground part was harvested and disposed of reasonably. After one season of treatment, the removal of heavy metals cadmium, lead, copper, nickel and zinc in the soil increased by 925%, 904%, 463%, 780% and 240%, respectively, compared with that without adding tea seed meal.

Embodiment 3

[0022] Evenly distribute 4400kg powdered tea seed meal to 338m 2 In the cadmium-contaminated soil (about 107 tons, calculated as 30cm topsoil), the soil is plowed and corn is planted by conventional methods, and field management is carried out according to conventional agronomic technical measures after planting. Among them, corn kernels are used as biomass energy materials, and the rest are treated as solid wastes for reasonable disposal. After one season of treatment, the heavy metal cadmium in the soil dropped from the original 1.18 mg / kg to 0.86 mg / kg, that is, the soil slightly polluted by cadmium was restored after restoration.

[0023] The applied material of the present invention is a by-product of agricultural product processing. Its application process is simple and easy to operate. It can be widely used in phytoremediation projects of heavy metal-contaminated soils in my country, especially in combination with high-biomass energy crops for soil remediation. The obta...

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Abstract

The invention belongs to the field of environmental science and discloses a method for reinforced plant remediation of heavy metal-polluted soil. The method comprises the following steps of uniformly applying 1 to 4% of camellia seed meal (cake) to heavy metal-polluted soil, turning over the soil, planting a high-biomass crop such as sugarcane or corn, after the crop matures, harvesting all biomass on the ground, and carrying out biomass comprehensive utilization and reasonable treatment so that heavy metal removal and soil remediation are realized. The method can greatly improve heavy metal absorption efficiency of plants, and has the characteristics of environmental friendliness, no secondary pollution, good economic benefits and strong operationality.

Description

technical field [0001] The invention belongs to the field of environmental science, and relates to a restoration technology of heavy metal-contaminated soil, in particular to an environmental treatment technology using tea seed meal, a by-product of agricultural product processing, as a phytoremediation soil reinforcement material, specifically a method for removing heavy metals in soil. Background technique [0002] Soil is not only the basic means of production in agriculture, but also an important part of the ecosystem. At present, the cultivated land area polluted by heavy metals in my country is 2.0×10 7 hm 2 , accounting for about 1 / 5 of the total arable land area, the annual reduction in grain production due to heavy metal pollution exceeds 1.0×10 7 t, and the grains polluted by heavy metals are up to 1.2×10 per year 7 t. Due to the characteristics of concealment, hysteresis, accumulation and irreversibility, soil pollution has seriously threatened my country's...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 夏会龙
Owner ZHEJIANG GONGSHANG UNIVERSITY
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