Method for extracting zinc from sludge continuouslly and restoring zinc pollution in soil by purple Jasmine
A technology for repairing soil of jasmine jasmine and used in the field of repairing soil zinc pollution, which can solve the problems of low overall removal efficiency of heavy metals, improvement of bioavailability, adaptation to different climates, etc., to improve soil degradation and productivity decline, high repair efficiency, and easy The effect of large biomass
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Embodiment 1
[0028] Example 1: Soil Remediation
[0029] From February to March, the seeds of Jasmine jasmine are sown in a flat field nursery, covered with fine sand or soil, with a relative air humidity of 70-90%, and a temperature of 20°C. When the seedlings of Viola jasmine grow to 3-5 leaves, they are transplanted into heavy metal-contaminated soil. The background content of heavy metal zinc in the soil is ≥250mg / kg. After growing for 10 months, the aboveground part is harvested, and 2 to 3 nodes are left as stubble. For the Jasmine Jasmine harvested for the first time, the content of heavy metal zinc in the aboveground part was determined to be ≥328 mg / kg (dry weight). The Jasmine Jasmine continued to grow, and the soil zinc was continuously extracted. The aboveground part of Jasmine Jasmine was continuously harvested, and the zinc content in the soil continued to decrease until The zinc content in the polluted soil is reduced to the normal soil level, and the soil zinc pollution is...
Embodiment 2
[0030] Example 2: Soil Remediation
[0031] In February-March, the seeds of Jasmine jasmine are sown in heavy metal-polluted soil, covered with fine sand or soil, with a relative air humidity of 70-90%, and a temperature of 20°C. The background content of heavy metal zinc in the soil is ≥250mg / kg, and the soil pH should be kept at 6-7.5. When the purple jasmine seedlings grow to 3 to 5 leaves, keep a row spacing of 1 meter and a plant spacing of 0.5 meters. After growing for 10 months, the aboveground part is harvested, and 2 to 3 nodes are left as stubble. For the Jasmine Jasmine harvested for the first time, the content of heavy metal zinc in the aboveground part was determined to be ≥328 mg / kg (dry weight). The Jasmine Jasmine continued to grow, and the soil zinc was continuously extracted. The aboveground part of Jasmine Jasmine was continuously harvested, and the zinc content in the soil continued to decrease until The zinc content in the polluted soil is reduced to the...
Embodiment 3
[0032] Embodiment 3: sludge zinc extraction
[0033] Bury the roots of Jasmine jasmine in the sand from February to March, drenched with water every day, the relative air humidity is 60-80%, and the temperature is 20°C. After the seedlings have grown to 3-5 leaves, transplant them to the soil with a zinc content of 250 mg / kg after sludge application, and keep the soil pH at 5-6; the distance between rows is 1 meter, and the distance between plants is 0.5 meters. It grows for 10 months, harvests the aboveground part, and leaves 2 to 3 stubbles. It has been determined that the heavy metal zinc content in the harvested Jasmine Jasmine ≥ 328mg / kg (dry weight); Jasmine Jasmine continues to extract zinc, and the Jasmine Jasmine shoots are continuously harvested, and the zinc content of the sludge applied to the soil decreases continuously until the zinc content Reduced to the normal level, the sludge zinc reaches the agricultural discharge standard.
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