Phytoremediation technology for heavy metal contaminated soil
A technology that pollutes soil and heavy metals, applied in the fields of agriculture and environmental protection, to achieve good results, low cost, and reduce pollution levels
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Embodiment 1
[0021] The test is located in a polluted wasteland on the outskirts of Liuyang City, Hunan Province. The soil lead concentration is 300mg / kg, which belongs to moderate lead pollution, and the soil cadmium concentration is 20mg / kg, which belongs to moderate cadmium pollution. The polluted waste land without grass was used as the control.
[0022] Plant 1.44 Digendou plants per square meter on the polluted land in March every year, sprinkle 2 kg of urea and 0.5 kg of potassium dihydrogen phosphate in each mu of soil, and water to 80% of the field water capacity after the initial planting. In the future, the water content of the soil is controlled to be 30-50% of the field water capacity. The leaves and stems of the grass are collected in September every year. The appearance of the leaves and stems has not changed much, and the national standard method is used to measure and analyze the cadmium and lead content of the soil, leaves and stems.
[0023] The cadmium content of the s...
Embodiment 2
[0025] The test was located in a polluted waste land outside a cadmium chemical factory in Hunan Province. The soil cadmium concentration was 50mg / kg, which belongs to moderate cadmium pollution. The polluted waste land without grass was used as the control.
[0026] Plant 2 Digendou plants per square meter on the polluted land in March every year, sprinkle 6 kg of urea and 2 kg of potassium dihydrogen phosphate in each mu of soil, and water to 80% of the field water capacity after the initial planting. The water content of the control soil is 30-50% of the field water capacity. The leaves and stems of the grass are collected in September every year. The appearance of the leaves and stems has not changed much, and the national standard method is used to measure and analyze the cadmium and lead content of the soil, leaves and stems.
[0027] After one year of remediation, the cadmium content of the soil, leaves and stems of Digi is 34mg / kg, 194mg / kg, and 136mg / kg, respectively...
Embodiment 3
[0029] The test is located in a polluted wasteland in the suburb of Liuyang City, Hunan Province. The soil lead concentration is 200mg / kg, which belongs to moderate lead pollution. The polluted waste land without grass was used as the control.
[0030] Plant 1.5 Digendou plants per square meter on the polluted land in March every year, sprinkle 4kg of urea and 1.2kg of potassium dihydrogen phosphate in each mu of soil, and water to 80% of the field water capacity after the initial planting. In the future, the water content of the soil is controlled to be 30-50% of the field water capacity. The leaves and stems of the grass are collected in September every year. The appearance of the leaves and stems has not changed much, and the national standard method is used to measure and analyze the cadmium and lead content of the soil, leaves and stems. The lead content of the soil, grass leaves and grass stems after one year of remediation are 81mg / kg, 149mg / kg, 54mg / kg respectively.
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