Method for efficiently repairing composite polluted soil by artificial ecological system

Abstract

The invention discloses a method for efficiently repairing composite polluted soil by an artificial ecological system. Scientific allocation is conducted according to different latitudes and longitudes, different temperature and humidity and different coastal pollution types. The ecological system of trees, shrubs, vines, herbaceous plants and benthonic animals is artificially constructed, and a unique sediment microbial community is naturally formed, so that heavy metal and organic pollutants in the polluted soil are quickly and effectively adsorbed and transformed by microorganism and are adsorbed and extracted by plants, and the effect of efficient purifying of the soil is achieved by artificially harvesting aboveground vegetation. According to the method for efficiently repairing the composite polluted soil by the artificial ecological system, the ecological system suitable for any soil pollution repairing can be derived in the case of scientific species configuration and the method has good ecological benefits and economic value. The maximization of the ecological benefits and repairing efficiency is ensured, meanwhile, repairing cost is reduced, and certain economic benefits can be produced.

Description

technical field

[0001] The invention relates to the field of soil remediation, in particular to a method for efficiently remediating composite polluted soil by using an artificial ecosystem. Background technique

[0002] At present, heavy metal and organic pollution has become an important obstacle to economic development and human health, and has received extensive attention internationally. The problem of soil pollution is particularly prominent in our country, mainly from modern industry, mining industry, smelting industry, municipal solid waste, pesticide abuse, etc., which have seriously affected my country's economic development, human health and quality of life. For example, in my country's grain production, the excessive rate of heavy metals in grain due to soil pollution has reached 10%, and the annual direct loss is as high as 20 billion yuan.

[0003] The remediation methods of soil pollution include chemical methods, physical methods and biological methods. Alt...

Examples

Embodiment 1

[0034] The selection of embodiment 1 material

[0035] (1) Trees: select trees with strong environmental adaptability, strong stress resistance, large biomass, high tolerance and accumulation characteristics of multiple heavy metals and / or organic compound pollution, and certain economic value. .

[0036] Preferably: jujube trees with high accumulation of manganese, zinc, and lead; camphor trees with high accumulation of manganese, copper, zinc, lead, and nickel; masson pine and hemlock with high accumulation of manganese, zinc, and lead; The Taiwan acacia with high accumulation, the haggard tree with high accumulation of lead, cadmium and zinc; , fast-growing trees with high accumulation of lead, bamboo willow, amorpha, alder, pistachio, Populus euphratica, mulberry, Paulownia and willow, fast-growing trees with high accumulation of cadmium, zinc, manganese, lead and copper, eucalyptus, and organic pollutants Alpine ficus and fir with high absorption capacity and fast-growi...

Embodiment 2

[0045] Example 2 Construction of Ecosystem

[0046] Experimental materials: Bamboo willow, iron broom with cut leaves, Schisandra angustifolia and / or fufangteng, lotus seedlings, Cynorrhizae haizhou, and earthworms.

[0047] 1) Bamboo willow seedlings are transplanted from the whole plant or rooted from cuttings, when the height is 1.5-1.8m. Transplant a bamboo willow seedling every 30-40cm in the heavy metal-polluted soil, the transplanting depth is 10-20cm, and the row spacing is 80-100cm. Apply N, P, and K fertilizers before planting or topdress during the period.

[0048] 2) After the bamboo willows are planted, evenly spread the wet vegetable garden soil mixed with 5-10% cow manure (or 5% pig manure, chicken manure) under the forest to a thickness of 2-3 cm, forming a "mediated environment" that is easy for earthworms to survive. Artificially cultivated earthworms, the density is 0.3-0.5kg / m 2 .

[0049] 3) Sow in the vegetable garden soil under the bamboo willow fore...

experiment example 1

[0053] Take soil not polluted by heavy metals, apply cadmium solution (in the form of CdCl 2 configuration) so that the cadmium concentrations were 0, 5, and 10 mg / kg·DW, and each treatment was repeated three times. Activation was carried out for 8 weeks to balance the distribution of heavy metal cadmium in the soil. During the activation period, the A. japonicus was multiplied. After the multiplication, the stem sections of the A. japonicus with uniform size (every two stem nodes were one section) were taken to grow roots in the Hoagland nutrient solution. Transplant the hollow lotus that has finished rooting into the activated soil, and water it regularly to ensure sufficient water. After 8 weeks of cultivation (i.e. in July), the aerial part was harvested to measure the tissue distribution of heavy metal cadmium in the stems and leaves, and then harvested once in September for a total of 3 times until the whole plant was harvested in November. Tissue distribution of heavy...

technical field

[0001] The invention relates to the field of soil remediation, in particular to a method for efficiently remediating composite polluted soil by using an artificial ecosystem. Background technique

[0002] At present, heavy metal and organic pollution has become an important obstacle to economic development and human health, and has received extensive attention internationally. The problem of soil pollution is particularly prominent in our country, mainly from modern industry, mining industry, smelting industry, municipal solid waste, pesticide abuse, etc., which have seriously affected my country's economic development, human health and quality of life. For example, in my country's grain production, the excessive rate of heavy metals in grain due to soil pollution has reached 10%, and the annual direct loss is as high as 20 billion yuan.

[0003] The remediation methods of soil pollution include chemical methods, physical methods and biological methods. Alt...

Examples

Embodiment 1

[0034] The selection of embodiment 1 material

[0035] (1) Trees: select trees with strong environmental adaptability, strong stress resistance, large biomass, high tolerance and accumulation characteristics of multiple heavy metals and / or organic compound pollution, and certain economic value. .

[0036] Preferably: jujube trees with high accumulation of manganese, zinc, and lead; camphor trees with high accumulation of manganese, copper, zinc, lead, and nickel; masson pine and hemlock with high accumulation of manganese, zinc, and lead; The Taiwan acacia with high accumulation, the haggard tree with high accumulation of lead, cadmium and zinc; , fast-growing trees with high accumulation of lead, bamboo willow, amorpha, alder, pistachio, Populus euphratica, mulberry, Paulownia and willow, fast-growing trees with high accumulation of cadmium, zinc, manganese, lead and copper, eucalyptus, and organic pollutants Alpine ficus and fir with high absorption capacity and fast-growi...

Embodiment 2

[0045] Example 2 Construction of Ecosystem

[0046] Experimental materials: Bamboo willow, iron broom with cut leaves, Schisandra angustifolia and / or fufangteng, lotus seedlings, Cynorrhizae haizhou, and earthworms.

[0047] 1) Bamboo willow seedlings are transplanted from the whole plant or rooted from cuttings, when the height is 1.5-1.8m. Transplant a bamboo willow seedling every 30-40cm in the heavy metal-polluted soil, the transplanting depth is 10-20cm, and the row spacing is 80-100cm. Apply N, P, and K fertilizers before planting or topdress during the period.

[0048] 2) After the bamboo willows are planted, evenly spread the wet vegetable garden soil mixed with 5-10% cow manure (or 5% pig manure, chicken manure) under the forest to a thickness of 2-3 cm, forming a "mediated environment" that is easy for earthworms to survive. Artificially cultivated earthworms, the density is 0.3-0.5kg / m 2 .

[0049] 3) Sow in the vegetable garden soil under the bamboo willow fore...

experiment example 1

[0053] Take soil not polluted by heavy metals, apply cadmium solution (in the form of CdCl 2 configuration) so that the cadmium concentrations were 0, 5, and 10 mg / kg·DW, and each treatment was repeated three times. Activation was carried out for 8 weeks to balance the distribution of heavy metal cadmium in the soil. During the activation period, the A. japonicus was multiplied. After the multiplication, the stem sections of the A. japonicus with uniform size (every two stem nodes were one section) were taken to grow roots in the Hoagland nutrient solution. Transplant the hollow lotus that has finished rooting into the activated soil, and water it regularly to ensure sufficient water. After 8 weeks of cultivation (i.e. in July), the aerial part was harvested to measure the tissue distribution of heavy metal cadmium in the stems and leaves, and then harvested once in September for a total of 3 times until the whole plant was harvested in November. Tissue distribution of heavy...

Images