Method for repairing cadmium, lead and copper combined-polluted soil with broom cypress

Abstract

The invention belongs to the polluted soil regeneration and utilization technology in the field of agricultural soil, and particularly relates to a method for repairing cadmium, lead and copper combined-polluted soil with broom cypress. In the method, broom cypress with stronger absorption capability is planted in the cadmium, lead and copper combined-polluted soil, and mature broom cypress is removed from the polluted soil, so as to achieve the purpose of removing heavy metals from the polluted soil. The method is low in investment, low in engineering work load, not high in management technical requirements, and free of secondary pollution, does not damage the physical-chemical properties of the soil, can conserve both moisture and soil and beautify environment, solves the problem of repairing control and utilization of the cadmium, lead and copper combined-polluted soil, and has excellent social benefits, economic benefits and ecologic benefits.

Description

Technical field:

[0001] The invention belongs to the regeneration and utilization technology of polluted soil in the field of agricultural soil, and particularly relates to a method for repairing cadmium-lead-copper composite polluted soil by using broom vegetables. Background technique:

[0002] Heavy metals are an important pollutant in the agricultural environment and agricultural products. Heavy metal pollution such as cadmium (Cd), lead (Pb), and copper (Cu) has become a worldwide environmental problem. Heavy metal pollution in farmland mainly comes from sewage irrigation and mining. Discharge of three wastes such as waste and smelting, large-scale application of urban sludge and garbage, organic fertilizers (especially in recent years, feed additives contain high amounts of copper, arsenic, etc.) Settlement, etc., because the natural purification process of heavy metals in the soil is very long, generally takes thousands of years, so its pollution is concealed, irrever...

Examples

Embodiment 1

[0023] In the farmland soil with cadmium (Cd), lead (Pb) and copper (Cu) contents of 0.83mg / kg, 208.00mg / kg and 224.33mg / kg respectively, broom vegetables were planted in early April, and 2000 mu of farmyard manure was applied 1 kg, 50 kg of phosphate fertilizer, and 50 kg of ammonium sulfate are used as base fertilizers. After plowing, harrow to preserve moisture. When sufficient base fertilizer is applied, 15 kg of nitrogen fertilizer can be topdressed as appropriate during the flowering stage of broom vegetables. When fertilizing, try to choose physiological acid fertilizers. Physiologically acidic fertilizers are beneficial to improve the availability of heavy metals in the soil and facilitate their absorption and removal. The growing season was managed according to traditional crop management methods and harvested in late October. It has been determined that the biomass of broom vegetables is 22500kg / ha, and the contents of cadmium (Cd), lead (Pb) and copper (Cu) in the a...

Embodiment 2

[0025]In the farmland soil with cadmium (Cd), lead (Pb) and copper (Cu) contents of 0.49mg / kg, 92.02mg / kg and 60.64mg / kg respectively, broom vegetables were planted in early April, and 2000 mu of farmyard manure was applied 1 kg, 50 kg of phosphate fertilizer, and 50 kg of ammonium sulfate are used as base fertilizers. After plowing, harrow to preserve moisture. When sufficient base fertilizer is applied, 15 kg of nitrogen fertilizer can be topdressed as appropriate during the flowering stage of broom vegetables. When fertilizing, try to choose physiological acid fertilizers. Physiologically acidic fertilizers are beneficial to improve the availability of heavy metals in the soil and facilitate their absorption and removal. The growing season was managed according to traditional crop management methods and harvested in late October. It has been determined that the biomass of broom vegetables is 24000kg / ha, and the contents of cadmium (Cd), lead (Pb) and copper (Cu) in the abov...

Technical field:

[0001] The invention belongs to the regeneration and utilization technology of polluted soil in the field of agricultural soil, and particularly relates to a method for repairing cadmium-lead-copper composite polluted soil by using broom vegetables. Background technique:

[0002] Heavy metals are an important pollutant in the agricultural environment and agricultural products. Heavy metal pollution such as cadmium (Cd), lead (Pb), and copper (Cu) has become a worldwide environmental problem. Heavy metal pollution in farmland mainly comes from sewage irrigation and mining. Discharge of three wastes such as waste and smelting, large-scale application of urban sludge and garbage, organic fertilizers (especially in recent years, feed additives contain high amounts of copper, arsenic, etc.) Settlement, etc., because the natural purification process of heavy metals in the soil is very long, generally takes thousands of years, so its pollution is concealed, irrever...

Examples

Embodiment 1

[0023] In the farmland soil with cadmium (Cd), lead (Pb) and copper (Cu) contents of 0.83mg / kg, 208.00mg / kg and 224.33mg / kg respectively, broom vegetables were planted in early April, and 2000 mu of farmyard manure was applied 1 kg, 50 kg of phosphate fertilizer, and 50 kg of ammonium sulfate are used as base fertilizers. After plowing, harrow to preserve moisture. When sufficient base fertilizer is applied, 15 kg of nitrogen fertilizer can be topdressed as appropriate during the flowering stage of broom vegetables. When fertilizing, try to choose physiological acid fertilizers. Physiologically acidic fertilizers are beneficial to improve the availability of heavy metals in the soil and facilitate their absorption and removal. The growing season was managed according to traditional crop management methods and harvested in late October. It has been determined that the biomass of broom vegetables is 22500kg / ha, and the contents of cadmium (Cd), lead (Pb) and copper (Cu) in the a...

Embodiment 2

[0025]In the farmland soil with cadmium (Cd), lead (Pb) and copper (Cu) contents of 0.49mg / kg, 92.02mg / kg and 60.64mg / kg respectively, broom vegetables were planted in early April, and 2000 mu of farmyard manure was applied 1 kg, 50 kg of phosphate fertilizer, and 50 kg of ammonium sulfate are used as base fertilizers. After plowing, harrow to preserve moisture. When sufficient base fertilizer is applied, 15 kg of nitrogen fertilizer can be topdressed as appropriate during the flowering stage of broom vegetables. When fertilizing, try to choose physiological acid fertilizers. Physiologically acidic fertilizers are beneficial to improve the availability of heavy metals in the soil and facilitate their absorption and removal. The growing season was managed according to traditional crop management methods and harvested in late October. It has been determined that the biomass of broom vegetables is 24000kg / ha, and the contents of cadmium (Cd), lead (Pb) and copper (Cu) in the abov...