Application of willow herb to remediation of heavy metal lead pollution in soil

A technology for repairing soil and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of plant growth stress, affecting plant physiological and biochemical characteristics, etc., and achieve the effect of less environmental disturbance, no damage to soil physical and chemical properties, and low cost

CN103433273AInactive Publication Date: 2013-12-11SICHUAN AGRI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-12-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of phytoremediation of heavy metal pollution in the environment, in particular to application of willow herb to remediation of heavy metal lead pollution in soil. A specific method of the application comprises the following steps; planting willow herb in the soil with heavy metal lead pollution; regularly carrying out whole-plant harvesting on most of the willow herb; only cutting overground parts of a small part of the willow herb and leaving the underground parts of the small part of the willow herb in the soil to use the underground parts of the small part of the willow herb as seedlings in the next season; carrying out ashing processing on the harvested willow herb; extracting heavy metal lead so as to carry out remediation on the soil with heavy metal lead pollution. The growth characteristics and economic value of the willow herb are utilized to carry out remediation treatment on the soil with lead pollution. The application has the advantages that disturbance to the environment is small; the physicochemical property of the soil is not destroyed; secondary pollution cannot be caused; cost is low; the application is suitable for a large area of soil with heavy metal lead pollution; the application can be used for landscaping and decoration. Moreover, the accumulated heavy metal lead also can be recycled, so that a certain economic benefits are generated.
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Description

technical field

[0001] The invention relates to the technical field of phytoremediation of heavy metal pollution in the environment, in particular to the application of willow orchid in remediating heavy metal lead pollution in soil.

[0002] Background technique

[0003] Soil is an important material basis for human agricultural production. Due to the mining, processing and utilization of heavy metal deposits, the rise of township enterprises and the large and uncontrolled use of chemical fertilizers and chemical pesticides, the content of heavy metals in the soil has increased sharply, resulting in heavy metal pollution in farmland soil. Our country reduces grain production by more than 10 million tons every year due to heavy metal pollution. In addition, due to extensive soil pollution, our country produces as many as 12 million tons of heavy metal-polluted grain every year. This not only seriously affects the yield and quality of crops, but also affects the quality of ...

Examples

Embodiment 1

[0025] The potting soil was collected from Shuijin Village, Caoba Town, Ya'an City, Sichuan Province, and the soil type was paddy soil. The soil samples were air-dried indoors to remove impurities, crushed, passed through a 2-mesh sieve and mixed for further use. To analyze pure Pb(OAc) 2 ??3H 2 O supply soil Pb, Pb 2+ Set up 7 concentration gradients (in Pb 2+ Concentration meter), respectively 0mg / kg, 300mg / kg, 500mg / kg, 1000mg / kg, 2000mg / kg, 3000mg / kg, 4000mg / kg. Dissolve the weighed Pb(OAc) with a small amount of deionized water when preparing lead-contaminated soil 2 ??3H 2 O, then the dissolved Pb(OAc) 2 The solution was evenly mixed in 18 kg of soil with a wooden tool, and the soil was put into 3 numbered flower pots, each pot was about 6 kg, water was added repeatedly, and naturally air-dried, so that the soil was repeatedly passivated for 1 month. After passivation, one willow orchid was planted in each pot, and compound fertilizer was added as base fertilizer....