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Soil improvement agent and improvement method of heavy metal lead-contaminated soil

A soil conditioner and lead-contaminated soil technology, applied in the field of soil conditioners, can solve the problems of waste of resources, pollution of the environment, etc., and achieve the effects of reducing emissions, increasing soil pores, and facilitating growth

Inactive Publication Date: 2014-01-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, bamboo shoot shells are processed by burning or directly discarding, which not only pollutes the environment but also causes a waste of resources

Method used

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  • Soil improvement agent and improvement method of heavy metal lead-contaminated soil
  • Soil improvement agent and improvement method of heavy metal lead-contaminated soil
  • Soil improvement agent and improvement method of heavy metal lead-contaminated soil

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Experimental program
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Effect test

Embodiment 1

[0024] The bamboo shoot shells were collected in the bamboo shoot processing factory, rinsed and dried in an oven at 100°C, crushed, placed in a quartz boat, and placed in a tubular pyrolysis furnace. The pyrolysis furnace was first quickly purged with nitrogen for 2 minutes. Finally, keep the airflow at about 1.2L / min. The pyrolysis conditions were set to rise from room temperature to 400 °C, the heating rate was 5 °C / min, and kept at 400 °C for 30 min, and then naturally cooled to room temperature, the residual solid components of pyrolysis were regarded as solid bamboo shoot shell-based biochar, The yield is 38.90%. from figure 1 It can be seen from the scanning electron microscope image that the obtained solid bamboo shoot shell-based biochar has good pores. Combining element analysis and energy spectrum analysis, the elemental composition is C67.17%, H3.885%, N3.102% , K1.20%, P0.41%, Mg0.26%, Ca0.28%, Si0.25%, O23.443%.

[0025] The experimental method of using solid ...

Embodiment 2

[0027] With the experimental method of embodiment 1, adopt the Pb of different concentration respectively 2+ Solution, to evaluate the adsorption capacity of the heavy metal lead in the solid bamboo shoot shell-based biochar soil with a mass fraction of 5%. The experimental results were calculated (see figure 2 ), 0.5g solid bamboo shoot shell-based biochar soil containing 5% mass fraction of Pb in 4mmol / L lead ion solution 2+ The adsorption capacity is 41.44mg / g, and the lead ion removal rate is 99.91%; for Pb in 6mmol / L lead ion solution 2+The adsorption capacity is 61.68mg / g, and the lead ion removal rate is 99.22%; for Pb in 8mmol / L lead ion solution 2+ The adsorption capacity is 82.64mg / g, and the lead ion removal rate is 97.11%; for Pb in 10mmol / L lead ion solution 2+ The adsorption capacity is 96.06mg / g, and the lead ion removal rate is 92.73%.

Embodiment 3

[0029] The solid bamboo shoot shell-based biochar obtained by pyrolyzing bamboo shoot shells at 400 °C for 30 min was added to the soil at a mass fraction of 2.5%, cultivated for 30 days, and air-dried. The soil bulk density after adding 2.5% solid bamboo shoot shell-based biochar was measured to be 0.7648g / cm 3 , compared with 0.9516g / cm when no solid bamboo shoot shell-based biochar was added 3 The soil bulk density has decreased by 19.63% compared to that, and the decrease of soil bulk density indicates that the air permeability and water permeability of the soil have been improved (see image 3 , Figure 4 ). The pH value of the soil increased by 0.28, indicating that the addition of bamboo shoot shell-based biochar can improve soil acidity. Get 0.5g of the above cultivated soil to absorb 25ml10mmol / L of Pb 2+ solution, after adsorption, use FAAS (flame atomic absorption spectrometry) to measure the concentration of lead ions remaining in the solution, and the result i...

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Abstract

The invention discloses a soil improvement agent and improvement method of heavy metal lead-contaminated soil, relating to a soil improvement agent. The soil improvement agent is solid bamboo shoot shell-based biochar, and elements obtained by isolating oxygen at 400 DEG C and pyrolyzing for 30 minutes include C, H, N, K, P, Mg, Ca, Si and O. The soil improvement agent is prepared by the steps of cleaning, drying and grinding a bamboo shoot shell, and putting into a pyrolyzing furnace; isolating oxygen at 380-420 DEG C and pyrolyzing for 20-40 minutes; drying, pre-charring and charring the biomass bamboo shoot shell to obtain solid bamboo shoot shell-based biochar. The improvement method comprises the steps of adding 2.5-10% of the soil improvement agent by mass into the heavy metal lead-contaminated soil; adding water to 70% of the saturation moisture capacity of the field oil; covering with a film to prevent water loss; forming air ports in the film at an interval of 5cm; adding water every 2-3 days to supplement the lost water; culturing, taking out the product and performing air drying to obtain improved soil.

Description

technical field [0001] The invention relates to a soil improver, in particular to a soil improver and a method for improving soil polluted by heavy metal lead. Background technique [0002] Soil is the loose surface layer on the earth's surface that is fertile and allows plants to grow. It is the most important, basic and irreplaceable natural resource for human beings. With the development of the national economy and industrial technology, heavy metal pollutants in industrial and mining waste water, petroleum, and pesticides continue to enter the soil environment, causing some cultivated land to be polluted by heavy metals. Excessive heavy metals in the soil will seriously affect the quality and yield of crops, and can be absorbed by crops and enter the human body through the food chain; in addition, heavy metals in the soil can also enter groundwater through the water cycle and enter the human body through drinking water. Due to the weak excretion effect of the human body...

Claims

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Application Information

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IPC IPC(8): C09K17/00B09C1/00
Inventor 叶李艺赵杰张敬苗吐松
Owner XIAMEN UNIV
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