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Method for removing soil heavy metal Cd and polycyclic aromatic hydrocarbon combined pollution

A polycyclic aromatic hydrocarbon and compound pollution technology, applied in the field of soil remediation, can solve problems such as high energy consumption and environmental hazards of organic matter, and achieve the effects of improving the soil environment, good environmental remediation, and simple operation procedures

Inactive Publication Date: 2020-01-07
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires high temperature treatment, high energy consumption, and the volatilization of organic matter causes serious harm to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for removing soil heavy metal Cd and polycyclic aromatic hydrocarbon compound pollution of the present embodiment may further comprise the steps:

[0022] Air-dry the soil with compound pollution of heavy metal Cd and polycyclic aromatic hydrocarbons and sieve it for subsequent use;

[0023] Air-dried corn stalks, put them into a ceramic crucible, calcined in a muffle furnace at 300°C for 3 hours, cooled naturally to room temperature, made biochar, passed through an 80-mesh sieve for later use; Add FeSO under the condition 4 ·7H 2 O, FeSO 4 ·7H 2 The mass ratio of O to biochar was 1:3, and the solution was heated to 90 °C after stirring for 1 h; KOH and KNO 3 It is configured into a 25g / L aqueous solution and added to the above solution. After mixing, it is ultrasonicated at 70°C, then centrifuged and dried at 70°C. 3 o 4 Biochar separation of corn stalks;

[0024] will load Fe 3 o 4 The corn stalk biochar is mixed with the sieved soil at a mass rati...

Embodiment 2

[0028] The method for removing soil heavy metal Cd and polycyclic aromatic hydrocarbon compound pollution of the present embodiment may further comprise the steps:

[0029] Air-dry the soil with compound pollution of heavy metal Cd and polycyclic aromatic hydrocarbons and sieve it for subsequent use;

[0030] Air-dry the soybean straw, put it into a ceramic crucible, calcinate it in a muffle furnace at 400°C for 3 hours, and cool it down to room temperature naturally to make biochar, which is passed through an 80-mesh sieve for later use; Add FeSO under the condition 4 ·7H 2 O, FeSO 4 ·7H 2 The mass ratio of O to biochar was 1:5. After stirring for 1 h, the solution was heated to 100 °C; KOH and KNO 3 It was configured into a 28g / L aqueous solution and added to the above solution. After mixing, it was ultrasonicated at 70°C, then centrifuged and dried at 70°C. 3 o 4 Separation of soybean straw biochar;

[0031] will load Fe 3 o 4 The soybean stalk biochar is mixed wit...

Embodiment 3

[0035] The method for removing soil heavy metal Cd and polycyclic aromatic hydrocarbon compound pollution of the present embodiment may further comprise the steps:

[0036] Air-dry the soil with compound pollution of heavy metal Cd and polycyclic aromatic hydrocarbons and sieve it for subsequent use;

[0037]Air-dry the eggplant stalks, put them into a ceramic crucible, calcinate them in a muffle furnace at 500°C for 3 hours, and cool them naturally to room temperature to make biochar, which is passed through an 80-mesh sieve for later use; Add FeSO under the condition 4 ·7H 2 O, FeSO 4 ·7H 2 The mass ratio of O to biochar was 1:6, and the solution was heated to 110 °C after stirring for 1 h; KOH and KNO 3 Make it into a 30g / L aqueous solution and add it to the above solution. After the mixing is completed, it will be ultrasonicated at 70°C, then centrifuged and dried at 70°C. 3 o 4 Biochar separation of eggplant straw;

[0038] will load Fe 3 o 4 The eggplant stalk b...

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PUM

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Abstract

The invention provides a method for removing soil heavy metal Cd and polycyclic aromatic hydrocarbon combined pollution, and belongs to the technical field of soil remediation. The method specificallycomprises the steps: air-drying soil with heavy metal Cd and polycyclic aromatic hydrocarbon combined pollution, and sieving for standby application; air-drying crop straws, calcining at the temperature of 300-500 DEG C for 3 h to prepare biochar, and sieving with an 80-mesh sieve for standby application; loading Fe3O4 on the biochar; mixing the Fe3O4-loaded biochar with the sieved soil accordingto a mass ratio of 1:20; and planting wheat on the mixed soil, scattering 200 g of wheat seeds per square meter, keeping the soil water content to be 55%-65% of the maximum water-holding capacity ofthe soil during the period, treating for 15-60 days, and separating the biochar adsorbing soil pollutants from the treated soil under the action of a magnetic field after the culture period is finished. The method is suitable for repairing the commonly-existing and complex heavy metal and polycyclic aromatic hydrocarbon combined polluted soil at present, can remove the difficult-to-degrade heavy metal and polycyclic aromatic hydrocarbon combined polluted soil at the same time, and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for removing compound pollution of soil heavy metal Cd and polycyclic aromatic hydrocarbons. Background technique [0002] The combined pollution of heavy metals and PAHs in the soil has obvious "three-caused" effects, which can accumulate in the soil environment, affect the development of plant roots and leaves, cause crop yield reduction or even death, and enter the food chain through plant absorption, causing serious harm to human health. Destroy the human nervous system, immune system, skeletal system, etc., and cause serious damage to human organs; at the same time, heavy metal and PAHs pollution will lead to changes in the function and structure of soil biological communities, which in turn will weaken or lose the stability of the ecosystem and seriously damage the natural environment. ecosystem. In recent years, research work on heavy metal-h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/00B09C1/105
Inventor 李桂荣陈富凯贾胜勇王宗硕郭泽楠
Owner ZHENGZHOU UNIV
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