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A combined biochar and phytoremediation method for heavy metal-contaminated soil

A technology for joint restoration and contaminated soil, applied in the field of contaminated soil treatment, can solve the problems of single heavy metal restoration element, low heavy metal absorption efficiency, long restoration time, etc., and achieves the effects of low planting difficulty, degradation of heavy metal pollution, and low cost.

Active Publication Date: 2018-08-17
湖南省和清环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 2. To overcome the problems of low heavy metal absorption efficiency of resistant crops, single heavy metal repair elements, too long repair time, and low survival rate

Method used

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  • A combined biochar and phytoremediation method for heavy metal-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Choose H that passes 20% 2 o 2 Disinfection treatment was followed by washing and soaking in distilled water for 12 hours. The annual SGK321 Bt-transgenic cotton seeds with plump and sinking grains grew into healthy seedlings of 30 cm and were buried in the soil surface at a depth of 15 cm along the vertical direction at an inclination of 30 degrees. The plant spacing was 20 cm and the row spacing was 25 cm. Irregular watering and weeding to ensure the normal growth of cotton. In late April, the annual SGK321 transgenic Bt cotton was planted in the test field. The cycle from planting to cotton picking was regarded as a cycle, and two cycles were planted continuously. After the cotton fruits were picked in the cotton mature season in each cycle, the cotton plants were treated. to remove in its entirety;

[0041] 2) After the cotton plants are removed as a whole in step 1), apply the biochar-based fertilizer into the heavy metal-polluted soil where cotton has been pl...

Embodiment 2

[0048] 1) Choose H that passes 20% 2 o 2 Disinfection treatment and then washing and soaking in distilled water for 12 hours. The annual TM-1 upland cotton seeds with plump and sinking seeds grow into healthy seedlings of 30 cm and are buried in the soil surface at a depth of 15 cm along the vertical direction at an inclination of 30 degrees. The plant spacing is 20 cm and the row spacing is 25 cm. Irregular watering and weeding to ensure the normal growth of cotton. In late April, two cycles of annual TM-1 upland cotton were continuously planted in the test field. The cycle from cotton planting to cotton picking was taken as a cycle. After picking the cotton fruits in the mature season of TM-1 upland cotton, the cotton plants were tested remove in its entirety;

[0049] 2) After the cotton plants are removed as a whole in step 1), apply the biochar-based fertilizer into the heavy metal-polluted soil where cotton has been planted in step 1), mix well, and age for 60 days;

...

Embodiment 3

[0056] 1) Choose H that passes 20% 2 o 2 Disinfection treatment and then washing and soaking in distilled water for 12 hours. The TM-1 upland cotton seeds with plump and sinking seeds grow into healthy seedlings of 30 cm and are planted at a depth of 10 cm in the soil surface at an inclination of 30 degrees in the vertical direction, with a plant spacing of 25 cm and a row spacing of 25 cm. Irregular watering and weeding to ensure the normal growth of cotton. In late April, two cycles of annual TM-1 upland cotton were continuously planted in the test field, taking cotton planting and cotton picking as a cycle, and after the cotton fruits were picked in the cotton mature season, the TM-1 upland cotton plants were tested. remove in its entirety;

[0057] 2) After the cotton plants are removed as a whole in step 1), apply the biochar-based fertilizer into the heavy metal-polluted soil where cotton has been planted in step 1), mix well, and age for 60 days;

[0058] 3) After th...

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Abstract

The invention provides a method for restoring heavy metal contaminated soil through combination of biological activated carbon and plants. The method includes the steps that cotton is planted in the heavy metal contaminated soil and after the cotton is picked, the cotton is completely removed; biological activated carbon base fertilizer is applied to the heavy metal contaminated soil where the cotton is planted and the base fertilizer is evenly mixed with the soil and aged; willows are planted after cotton biological activated carbon aging is finished, the willows are completely removed after 10 months to 12 months; the biological activated carbon base fertilizer is applied in the heavy metal contaminated soil where the willows are planted again, and the base fertilizer is evenly mixed with the soil and aged; after willow biological activated carbon aging is finished, cotton is continuously planted, and cotton plants are completely removed after the cotton is picked; the steps mentioned above are cyclically repeated till the content of heavy metal in the soil reaches the safety standard. By the adoption of the method, the soil treatment effect is good, the environment can be beautified when the heavy metal contaminated soil is treated, and practicality is high.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a method for jointly repairing heavy metal-contaminated soil with biochar and plants. Background technique [0002] Soil is not only an important part of the earth's ecological circle, but also one of the important natural resources that human beings rely on for survival. With the development of industrial activities such as mineral mining and smelting, and agricultural activities such as sewage irrigation, application of sludge and low-quality chemical fertilizers, harmful heavy metals such as Cd and Pb continue to enter the soil environment, causing pollution to normal production and life. Therefore, the control of soil heavy metal pollution is of great significance to the ecological civilization and the healthy life of human beings. [0003] The traditional remediation methods for soil heavy metal pollution are usually physical and chemical methods, such as dilution...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 马新攀
Owner 湖南省和清环境科技有限公司
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