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A method for remediating as-cd composite polluted farmland soil using a hyperaccumulator biochar combination system

A technology for hyper-accumulation of plants and biomass char, applied in the restoration of polluted soil and other directions, can solve the problems of limiting the popularization and application of phytoremediation technology, poor adaptability to farmland soil environment, and narrow growth range, and achieve a green and healthy preparation process. , the effect of small soil environmental disturbance and simple conditions

Active Publication Date: 2020-11-20
SHENGSHI LANDSCAPE GRP CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

Because the aboveground biomass of the known hyperaccumulator plants is generally small and grows slowly, and many of them come from heavy metal mines (belonging to the mine ecotype), they have poor adaptability to the farmland soil environment and narrow growth range, which limits phytoremediation technology. Promoted application of

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  • A method for remediating as-cd composite polluted farmland soil using a hyperaccumulator biochar combination system

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Embodiment 1

[0038] A method for repairing As-Cd complex polluted farmland soil by using a hyperaccumulator plant biochar combination system, comprising the following steps:

[0039] Step 1: monitor and sample farmland soil as the test soil, and use hyperaccumulator plants to conduct a pot test on the test soil. The potted test used PVC pots with a diameter of 14 cm and a height of 15 cm, and each pot was tested with 1.5 kg of soil. First, the nitrogen, phosphorus and potassium base fertilizer was applied to the test soil, and the application rate was 0.4 g / kg. Mix well, and after standing for a week, carry out the experiment of single-planting nightshade, single-planting big-leaf wellhead grass, intercropping nightshade and big-leaf wellhead grass; There were 20 wellhead sidegrass plants; under intercropping conditions, 10 solanum nigrum and big-leaf wellhead sidegrass were transplanted in each pot. The plant samples are divided into aerial parts and roots. The aerial parts are rinsed wi...

Embodiment 2

[0052] A method for repairing As-Cd complex polluted farmland soil by using a hyperaccumulator plant biochar combination system, comprising the following steps:

[0053] Step 1, monitor and sample the farmland soil, as the test soil, use hyperaccumulator plants to carry out a pot test on the test soil; according to the structure of the pot test, it is determined to use intercropping nightshade and big-leaf wellhead edge grass, nightshade and big-leaf wellhead The seeding rate of edge grass is the same, the total seeding rate of both is 1.6 g / m 2 .

[0054] Step 2: In late April in spring, apply NPK base fertilizer to the farmland soil at an application rate of 0.5 g / kg, turn the soil and mix it evenly. The farmland is sown, and the hyperaccumulative plants are harvested when they emerge and grow to firmness (a total of 85 days from sowing to harvest); during this period, they are irrigated with tap water, and the soil humidity is kept at 60% of the field water capacity.

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Abstract

The invention discloses a method for restoring As-Cd-combined-polluted farmland soil through a hyperaccumulator biomass charcoal combined system. The method comprises the following steps that the farmland soil is monitored and sampled at first, the varieties and planting modes of hyperaccumulators are determined, and enrichment of As and Cd is achieved; then a composite modifier mainly composed ofa microbial agent and a chelating agent is applied to the polluted farmland soil, and passivation and chelating of As and Cd are achieved; and a biomass charcoal-based restoring agent is applied to the surface of the farmland soil, soil is turned over and mixed evenly, and still standing is conducted, so that a treatment cycle is completed. Through the composite modifier, the biomass charcoal-based restoring agent and the hyperaccumulators are used for modifying and restoring the As-Cd-combined-polluted farmland soil, As-Cd heavy metal pollution of soil can be reduced and alleviated, the soilactivation and nutrients are improved, the soil structure is improved, plant growth is promoted, plant diseases and insect pests are suppressed, preparation is convenient, and the method is safe, reliable and suitable for large-area popularization.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating As-Cd complex polluted farmland soil by using a hyperaccumulation plant biochar combined system. Background technique [0002] With the development of the economy, farmland environmental pollution and the resulting threats to crops and human health are issues of widespread concern in the world today. Toxic element pollution and its prevention and control are an important topic in current environmental pollution research. Heavy metal polluted soil is highly toxic, difficult to degrade, and easy to accumulate. It can be enriched in soil and organisms, enter the human body through the food chain, and damage human health. It has concealment, long-term irreversibility, and serious consequences. It affects the safety of the ecosystem one of the important pollutants. [0003] Cadmium (Cd), one of the "five poisons" of heavy metals, stays in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10B09C1/08
CPCB09C1/08B09C1/10B09C1/105B09C2101/00
Inventor 李庆召梁丽珍郑宾国许朋涛李鹏飞党远万芳李玉鹏
Owner SHENGSHI LANDSCAPE GRP CO LTD
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