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Soil heavy metal passivation agent applicable to water-flooding environment and application thereof

A heavy metal passivator, soil technology, applied in the application, soil conditioning materials, chemical instruments and methods, etc., can solve problems such as complex influencing factors, and achieve the effects of high treatment efficiency, low cost, and reduced decomposition rate

Active Publication Date: 2015-07-22
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the water environment, the characteristics of the soil medium and the influencing factors on the adsorption of heavy metals by hickory nut shells are more complex, and there are no related reports on the application of hickory nut shells to soil as a heavy metal passivator.
There is no report on the development of bauxite as a soil heavy metal passivator

Method used

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  • Soil heavy metal passivation agent applicable to water-flooding environment and application thereof
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  • Soil heavy metal passivation agent applicable to water-flooding environment and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the comparison of hickory nut shell powder, bauxite and other organic and inorganic materials to the adsorption capacity of Cd

[0020] 1. Materials and methods

[0021] 1) Test materials: ①Hickory nut shell powder is collected from the hickory nut production area in Lin'an. After the hickory nut shells are piled up and decomposed, they are dried and ground through a 2mm sieve, and stored in a cool place for later use. ② The bauxite was collected from Wenzhou Alum Mine. The company mainly uses the water immersion method to produce alumite, that is, the alumite is obtained by roasting, weathering, and water immersion to obtain the original liquid, and then the finished alumite is formed by crystallization. The alum slurry in the crystallization pool is squeezed and dried. Bauxite is formed. The dried bauxite is agglomerated. After the bauxite is ground through a 2mm mesh sieve, it is stored in a cool place for later use. ③ Bagasse, ④ Peanut shells, ⑤ Bar...

Embodiment 2

[0026] Embodiment 2: the modification test of hickory nut shell powder and bauxite

[0027] 1. Materials and methods

[0028] (1) test material is the same as embodiment 1

[0029] (2) Modification method: soak the materials in ①30% H 2 o 2 、②15gL -1 KMnO 4 , ③1mol / L hydrochloric acid, ④1mol / L NaOH, ⑤0.3mol / L sulfuric acid, ⑥1mol / L phosphoric acid, ⑦0.5mol / L oxalic acid, ⑧0.2mol / L NaOH-ethanol solution, solid-liquid ratio 1:10, at 80 ℃ water bath for 3 h, washed with distilled water until neutral, and dried at 80 ℃ for later use.

[0030] (3) Maximum adsorption capacity test: the same as in Example 1.

[0031] 2. Results and analysis (see Table 1 and Table 2)

[0032] Table 1: Effects of different modification methods on the adsorption capacity of hickory nut shell and bauxite on Cd

[0033]

[0034]

[0035] Table 2: Recovery of hickory shells and bauxite after modification

[0036]

Modification method

Pecan Shells

Bauxite

1

1m...

Embodiment 3

[0039] Example 3: Effects of different ratios of hickory nut shells and bauxite on soil exchangeable Cd content under different moisture conditions

[0040] 1. Materials and methods

[0041] (1) material for testing: with embodiment 2

[0042] (2) Test plan:

[0043] The soil was collected from a heavily Cd-contaminated farmland in a tailings area in Zhejiang Province. The total Cd content in the soil was 13.63mg / kg, and the available Cd content in the soil was 6.34mg / kg. There were 12 treatments in this experiment, including 6 treatments for the mixing ratio of hickory nut shell powder and bauxite, and 2 treatments for soil moisture. Mixing ratio: the modified hickory nut shell powder and bauxite are respectively according to ①0%+0% (control), ②80%+20%, ③85%+15%, ④90%+10%, ⑤95%+5 %, ⑥ 100% + 0% ratio fully mix. Afterwards, the mixed samples in various proportions were fully mixed with 100 g of air-dried soil samples in an amount (volume ratio) of 1.0%. Soil moisture: (1)...

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Abstract

The invention discloses a soil heavy metal passivation agent applicable to a water-flooding condition and an application thereof. Some conventional heavy metal passivation agents have an oxidation characteristic, thereby being only applicable to dry land soil (under an oxygen consumption condition) and being possible to lose the fixing capacity due to reduced denaturation under a long-term water-flooding condition. The soil heavy metal passivation agent is prepared by adopting the following steps: 1) preparing an oxalic acid modified-hickory nut shell powder; 2) preparing an NaOH modified-bauxite powder; and 3) fully mixing evenly the oxalic acid modified-hickory nut shell powder and the NaOH modified-bauxite powder, to form the biological-inorganic composite heavy metal passivation agent with the particle size of 1-3 mm. Through modification, the adsorptive property of the hickory nut shell powder and the bauxite powder on Cd is imprioved, the biological organic-inorganic compound is formed by mixing the hickory nut shell powder and the bauxite powder, the decomposition rate of the hickory nut shell powder can be effectively reduced, and the process of re-releasing previously-adsorbed Cd to the soil is slowed down.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution control, in particular to a biological-inorganic composite soil heavy metal passivator suitable for flooding conditions and an application thereof. Background technique [0002] Rice is the largest food crop in my country, and the average annual rice planted in my country is 31 million ha 2 , accounting for about 20% of the world's sown area; the average annual rice production is 187 million tons, accounting for about 35% of the world's total rice production, ranking first in the world; the average rice yield per mu is about 410kg, which is 1.6 times the world's average level. Ranked among the best in rice-producing countries. About 65% of the population in my country takes rice as a staple food, so the quality of rice is closely related to people's health. However, with the continuous expansion of my country's industrial production scale and the rapid development of urbanizat...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 郭彬刘琛李凝玉傅庆林丁能飞林义成李华
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES