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Remediation method for heavy metal Cd and polycyclic aromatic hydrocarbon combined polluted soil

A polycyclic aromatic hydrocarbon and compound pollution technology, applied in the field of soil remediation, can solve the problems of complex operation, low polycyclic aromatic hydrocarbon removal rate, low recovery rate, etc., and achieves good environmental remediation, easy engineering application and simple process flow. Effect

Inactive Publication Date: 2020-05-15
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method configures the mixture first, and then sprays hydrogen peroxide, the operation is complicated, and the removal rate of polycyclic aromatic hydrocarbons is low, and the recovery rate is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for remediating soil contaminated by heavy metals Cd and polycyclic aromatic hydrocarbons in this embodiment is: putting eggplant straws into a muffle furnace at 500°C to isolate oxygen for 2 hours, and then evenly grind them to make eggplant straw biochar; sprinkle eggplant straw biochar into the soil Medium, 1m 2 Sprinkle 10.5 kg of eggplant straw biochar on the land, plow the soil, and then plant the enriched plant ryegrass in the soil, the planting density is: 1m 2 Spread 135g of ryegrass seeds evenly on the ground, sprinkle a thin layer of soil, water and keep the soil moisture content at about 60%. In this embodiment, the algorithm for the amount of eggplant straw biochar is: the ploughing depth is 35cm, and the density of the planting soil is 1.5g / cm 3 , The mass ratio of eggplant straw biochar to plowing soil is 1:100, and 1m 2 The amount of eggplant straw biochar that needs to be sprinkled on the land is 10.5 kg.

[0024] The remediation method of this e...

Embodiment 2

[0026] The method for remediating soil contaminated by heavy metals Cd and polycyclic aromatic hydrocarbons in this embodiment is: putting eggplant straws into a muffle furnace at 500°C to isolate oxygen for 2 hours, and then evenly grind them to make eggplant straw biochar; sprinkle eggplant straw biochar into the soil Medium, 1m 2 Sprinkle 31.5 kg of eggplant straw biochar on the land, plow the soil, and then plant the enriched plant ryegrass in the soil, the planting density is: 1m 2 Spread 135g of ryegrass seeds evenly on the ground, sprinkle a thin layer of soil, water and keep the soil moisture content at about 60%. In this embodiment, the algorithm for the amount of eggplant straw biochar is: the ploughing depth is 35cm, and the density of the planting soil is 1.5g / cm 3 , The mass ratio of eggplant straw biochar to plowing soil is 3∶100 to get 1m 2 The amount of eggplant straw biochar that needs to be sprinkled on the land is 31.5 kg.

[0027] The remediation method of this...

Embodiment 3

[0029] The method for remediating soil contaminated by heavy metals Cd and polycyclic aromatic hydrocarbons in this embodiment is: putting eggplant straws into a muffle furnace at 500°C to isolate oxygen for 2 hours, and then evenly grind them to make eggplant straw biochar; sprinkle eggplant straw biochar into the soil Medium, 1m 2 Sprinkle 52.5 kg of eggplant straw biochar on the land, plow the soil, and then plant the enriched plant ryegrass in the soil, the planting density is: 1m 2 Spread 135g of ryegrass seeds evenly on the ground, sprinkle a thin layer of soil, water and keep the soil moisture content at about 60%. In this embodiment, the algorithm for the amount of eggplant straw biochar is: the ploughing depth is 35cm, and the density of the planting soil is 1.5g / cm 3 , The mass ratio of eggplant straw biochar to plowing soil is 5∶100, and 1m 2 The amount of eggplant straw biochar that needs to be sprinkled on the land is 52.5 kg.

[0030] The remediation method of this e...

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Abstract

The invention provides a remediation method for heavy metal Cd and polycyclic aromatic hydrocarbon combined polluted soil, and belongs to the technical field of soil remediation. The method comprisesthe following steps: (1) calcining crop straws in the absence of oxygen to prepare charcoal for later use; (2) spreading biochar into soil, plowing the soil, then planting an enriched plant ryegrass in the soil, uniformly spreading 135 g of ryegrass seeds on the land with the planting density of 1 m<2>, spreading a layer of thin soil, and watering to keep the water content of the soil at 55-65%. The method is applied to remediation of soil polluted by heavy metal Cd and polycyclic aromatic hydrocarbon pyrene, and particularly has a remarkable removal effect on pyrene in the soil.

Description

Technical field [0001] The invention belongs to the technical field of soil remediation, and particularly relates to a method for remediating composite contaminated soil by heavy metal Cd and polycyclic aromatic hydrocarbons. Background technique [0002] Affected by human industry and agricultural activities, soil pollution is becoming more and more serious. The compound pollution of heavy metal Cd and organic polycyclic aromatic hydrocarbons is particularly serious. These two substances will last a long time in the soil due to their special chemical properties and pass The food chain continues to cause huge ecological damage and human health problems. [0003] In the soil remediation industry, there are more than one hundred kinds of soil remediation technologies, and there are also more than ten commonly used technologies, which can be roughly divided into three methods: physical, chemical and biological. Fundamentally speaking, the technical principles of contaminated soil rem...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/00B09C1/105
Inventor 李桂荣王宗硕贾胜勇其他发明人请求不公开姓名
Owner ZHENGZHOU UNIV
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