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Floating material and heavy metal-contaminated soil remediation method and application based on floating material

A technology of floating materials and repair methods, applied in the field of heavy metal contaminated soil remediation, can solve the problems of secondary pollution, difficult to recycle, re-release of cadmium, etc., to achieve the effect of enhancing binding ability, promoting dispersion ability, and enhancing soil fertility

Active Publication Date: 2022-07-19
POWERCHINA ZHONGNAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of material is not suitable for the treatment of heavy metals in soil, because rice straw has a specific adsorption effect on cadmium, and often excessive cadmium is enriched in plants. If it is added to the soil again, it will easily cause secondary pollution. , this method uses rice as raw material to produce powdered biochar, which is difficult to recycle, and changes in the environment will easily cause cadmium to be released again

Method used

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  • Floating material and heavy metal-contaminated soil remediation method and application based on floating material
  • Floating material and heavy metal-contaminated soil remediation method and application based on floating material
  • Floating material and heavy metal-contaminated soil remediation method and application based on floating material

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Weigh 50 g of coconut shell raw material with particle size of 1~2 mm, place it in 1 L of 10% H 3 PO 4 In the solution, after stirring for 30 min, washed with deionized water until neutral, dried at 60 °C for 24 h, and then placed 10 g of the dried material in 1000 mL of 1.0 g / L Ca of ultrasonic dispersion. 10 (PO 4 ) 6 OH 2 The solution was stirred at room temperature for 2 h. Filter and dry to obtain solid raw materials. The solid raw materials were then placed in a tube furnace, and pyrolyzed at 500 °C, 550 °C, and 600 °C for 1 h, and N was introduced into the furnace. 2 , N 2 The rate was 500 mL / min and the heating rate was 10°C / min to obtain a floating material.

[0051] After grinding and sieving the above floating materials, the specific surface area and pore size of the biochar were characterized by a specific surface area analyzer (BET), and the pretreatment temperature was set to 350 °C.

[0052] The characterization results show that the specific surf...

Embodiment 2

[0054] Weigh 50 g of coconut shell raw material with particle size of 1~2 mm, place it in 1 L of 10% H 3 PO 4 In the solution, after stirring for 30 min, washed with deionized water to neutrality, dried at 60 °C for 24 h, respectively added 10 g of the dried material and placed in 1000 mL of 0.1 g / L, 0.5 g / L ultrasonically dispersed, 1.0 g / L, 1.5 g / L, 2.0 g / L of Ca 10 (PO 4 ) 6 OH 2 The solution was stirred at room temperature for 2 h. Filter and dry to obtain solid raw materials. The solid raw materials were then placed in a tube furnace, and pyrolyzed at 500 °C for 1 h. 2 The heating rate was 500 mL / min and the heating rate was 10 °C / min to obtain floating materials HPBC0.1, HPBC0.5, HPBC1, HPBC1.5, and HPBC2 with different properties.

[0055] 30 mg of floating materials with different ratios were respectively placed in 30 mL and 50 mg / L Cd solution, shaken at room temperature for 12 h, 150 rpm, sampled to measure the Cd concentration of the supernatant, and the remo...

Embodiment 3

[0066] The effect of different reaction times on the removal of Cd from floating materials was measured. 100 g of naturally air-dried paddy soil with a Cd concentration of 1.2 mg / kg was weighed and placed in a 1 L beaker. Add 2 g of floating material to the Cd-contaminated soil, add a small amount of water, soak the soil and the floating material, so that the floating material and the cadmium-contaminated soil are fully mixed. After standing for 5 d, 10 d, 15 d and 20 d, add ultrapure water 5-8 cm above the soil interface, stir well to make all the materials float, and then use the fishing net to recover, and remove the upper layer of mud-water mixture. The experiment was set up in parallel with three groups. Calculate the removal rate of total cadmium, the result is as follows image 3 shown.

[0067] The effects of different dosages on the removal of Cd from floating materials were weighed and 100 g of paddy soil with a natural air-dried Cd concentration of 1.2 mg / kg was w...

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Abstract

The invention discloses a floating material. The floating material is prepared from biomass raw materials treated with weak acid, loaded with nano-hydroxyapatite, and then dried and pyrolyzed. The specific surface area of ​​the floating material is 322.16-370.46 m 2 / g, the average pore diameter is 6-9 nm. The invention also discloses the application of the floating material in repairing cadmium-contaminated soil, and at the same time, the invention also discloses a method and application for repairing heavy metal-contaminated soil based on the floating material, including adding the floating material to the heavy-metal-contaminated soil, Irrigation and ploughing make the soil of the plough layer and the floating material fully mixed and evenly aged, so that the floating material can fully enrich the heavy metals in the soil; add irrigation water to the field to make the floating material float on the water surface, and then recycle the floating material to remove the upper layer of muddy water mixture. The floating material in the present invention has the ability to float and highly enrich heavy metals, and at the same time, it can improve the soil.

Description

technical field [0001] The invention relates to the field of heavy metal-contaminated soil remediation, in particular to a floating material and a remediation method and application of heavy metal-contaminated soil based on the floating material. Background technique [0002] my country has more people and less land, and the soil pollution is mainly heavy metal pollution, of which 90% of the soil is moderately or slightly polluted. Therefore, in order to ensure the safe and sustainable utilization of soil resources, it is urgent to develop cost-effective cadmium-contaminated soil remediation methods, and finally quickly realize the safe production of food on moderate and mild cadmium-contaminated soils. [0003] At present, the remediation technologies for light and moderate cadmium-contaminated soils can be divided into agricultural regulation, physical remediation, chemical remediation and bioremediation methods, and can be divided into passivation methods and reduction me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 刘喜肖劲光王薇肖武张荷朱波贺凯邓婷婷
Owner POWERCHINA ZHONGNAN ENG
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