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Method for ecologically managing super-standard lead of tea garden soil

A technology for ecological governance and tea gardens, which is applied in the field of phytoremediation of excessive heavy metals in tea garden soil, can solve the problems of non-compliance with the tea garden pollution control model, secondary pollution, and high cost of treatment, so as to improve ecological and environmental protection benefits, low maintenance costs, and avoid secondary pollution. pollution effect

Inactive Publication Date: 2011-11-16
杭州大清智能技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods commonly used to deal with heavy metal pollution include calcination, solidification, high-temperature melting, acid leaching, ammonia leaching and other physical and chemical repair methods, but these methods are costly to treat and are likely to cause secondary pollution, so these treatment methods are not in line with sustainable tea gardens. Developed Pollution Control Model

Method used

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  • Method for ecologically managing super-standard lead of tea garden soil
  • Method for ecologically managing super-standard lead of tea garden soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The monitoring results of heavy metal content in the soil of a new tea garden showed that the average content of heavy metal lead in the tea garden soil was 822mg / kg. The short calyx gray leaf seeds are planted in the tea garden according to the distance between the short calyx gray leaves and the tea tree*row spacing=60*60cm in the first and middle ten days of March. After 6 months of its natural growth, when the height of the plant was about 130cm, the aboveground part was harvested for the first time, and 40cm of stubble was left. After analysis, the lead content in the aboveground part is about 1550mg / kg, and the average lead content in the soil is reduced from 822mg / kg to 628mg / kg, which is equivalent to reducing the lead content in the soil by about 25%. Planting short calyx ash leaves can be harvested once in the year, and can be harvested twice in the second three years. The useful life is 2-3 years. When the useful life is reached, it will be removed and collec...

Embodiment 2

[0030] For an adult tea tree garden, after spring tea picking and pruning in late April, interplant short calyx gray leaves into the tea garden according to the distance between the short calyx gray leaves and the tea plants*row spacing=70*100cm, and grow naturally for 5 After one month, when the plant height is about 120cm, harvest its aboveground part for the first time, leave 50cm of stubble, plant the short calyx ash leaves and harvest once in the year, and can harvest twice in the second and third years, and the useful life is 2-3 years. The second crop is planted after its overall removal, and the above process is repeated until the tea garden soil reaches the lead content standard of GB15618-95 soil environmental quality. Harvested or removed plants and tea garden prunings are collected and then mechanically solidified and molded to make biomass fuel blocks with a molding density of about 1.1-1.3kg / m 3 . The collected hyperaccumulative plants and tea tree prunings are ...

Embodiment 3

[0032] To another tea garden soil heavy metal content monitoring, its lead content mean value is 1151mg / kg, by the method for embodiment 1 after the short calyx ash leaf is planted two years, through analysis and determination, its above-ground lead content is 2250mg / kg, above-ground The absorption and enrichment of lead in the soil increased with the growth of its growth period, and the lead content in the soil had a tendency to return to normal. The problem of heavy metal lead exceeding the standard in tea gardens can be effectively solved by repeated planting of hyperaccumulator plants. Fundamentally improve the physical properties of the soil, increase soil fertility, promote the growth of tea trees, and provide good ecological conditions for high-quality and high-yield tea gardens.

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Abstract

The invention relates to a method for ecologically managing super-standard lead of tea garden soil, which is characterized by using super enrichment plants to adsorb super-standard heavy metal lead in a tea garden, and realizing resource utilization of lead-enriched plants through the biomass mechanical curing and forming technology. The method comprises the following steps of: selecting seeds; breeding proper bush-like super enrichment plants, such as tephrosia candida; and using the super enrichment plants to continuously adsorb the heavy metal lead in the tea garden soil through an interplanting method. Therefore, the physical properties of the soil are improved; the soil fertility is improved; the growth of tea tree is promoted; a good ecological condition is provided for high quality and yield of the tea garden; the super enrichment plants and trimmed branches of the tea garden are mechanically cured and formed and used as fuel; the ash of this fuel after combustion is used as raw materials of cement or bricks so as to be permanently separated from the soil; the secondary contamination of the heavy metal lead to water and soil is avoided; resource utilization is carried out; the method has the advantages of low investment and low workload; physicochemical properties of soil are not damaged; the secondary contamination is not resulted; the lead contamination problem of the tea garden soil can be solved permanently; and the method is an economically feasible and environment-friendly method for repairing the heavy metal lead contamination of tea garden soil.

Description

technical field [0001] The invention discloses a phytoremediation method for ecologically treating tea garden soil with excessive lead, and belongs to the technical field of phytoremediation of excessive heavy metals in tea garden soil. It is mainly through the introduction of plants with high enrichment capacity for heavy metal lead in the gaps of the tea garden, and the plants are collected regularly, and together with the pruning of the tea garden, they are mechanically solidified and formed into biomass fuel blocks, and the ashes after burning are classified. Those with metallurgical value can be recycled as metallurgical raw materials, and those without metallurgical value can be used as raw materials for producing cement or bricks, so as to achieve the purpose of permanently separating the adsorbed heavy metal lead from the soil. It is an effective method for ecologically treating tea garden soil with excessive lead. method. Background technique [0002] Tea, as a hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00C22B7/00
CPCY02P10/20
Inventor 不公告发明人
Owner 杭州大清智能技术开发有限公司
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