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Heavy metal passivator and preparation method thereof, and method for restoring cadmium/lead polluted soil

A heavy metal passivator, lead-contaminated soil technology, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc. The effect of reducing absorption, simple production process and high passivation efficiency

Inactive Publication Date: 2015-11-11
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, all kinds of passivators have their scope of application and limitations, and there are high production costs or complicated processes, which are limited to laboratory research and are not suitable for large-scale production

Method used

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  • Heavy metal passivator and preparation method thereof, and method for restoring cadmium/lead polluted soil
  • Heavy metal passivator and preparation method thereof, and method for restoring cadmium/lead polluted soil
  • Heavy metal passivator and preparation method thereof, and method for restoring cadmium/lead polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first method utilizes hydroxyaluminum mud to remediate Cd, Pb polluted soil in situ, carries out according to the following steps:

[0029] (1) Dry and grind the alum mud and place it in a muffle furnace at 5°C min -1 Raise the temperature to 800°C at a constant speed, cool naturally after roasting for 1 hour, wash with water until neutral and dry. The obtained alum mud powder and 0.5molL -1 The NaOH solution was formulated into a solution according to the ratio of solid-liquid 0.5g:10mL, and 0.5% Tween-80 was added, heated in a water bath, and the reaction temperature and stirring speed were controlled to be 100°C and 600rmin respectively. -1 The reaction time is 2 hours. After the end, it is cooled, precipitated, and washed to neutrality. The solid part is dried and ground to obtain hydroxyaluminum mud ,spare;

[0030] (2) suitable for use hydroxyaluminum mud The choice of in-situ remediation of Cd, Pb contaminated soil: the total Cd content 1.0mgkg -1 and ...

Embodiment 2

[0035] The second method utilizes hydroxyaluminum mud to remediate Cd, Pb polluted soil in situ, according to the following steps:

[0036] In this example,

[0037] Step (1) After drying and grinding the alum mud, place it in a muffle furnace at 5°C min -1 Raise the temperature to 800°C at a constant speed, cool naturally after roasting for 1 hour, wash with water until neutral and dry. The obtained alum mud powder and 2.0molL -1 2.0g:10.0mL ratio of solid to liquid to prepare a solution, add 0.5% Tween-80, heat in a water bath, control the reaction temperature and stirring speed to 100°C and 600rmin respectively -1 The reaction time is 3 hours. After the end, it is cooled, precipitated, and washed to neutrality. The solid part is dried and ground to obtain hydroxyaluminum mud ,spare;

[0038] Step (2) select full Cd content 3.0mgkg -1 and full Pb content 600mgkg -1 The polluted soil was used as the soil to be repaired; step (3) applied the hydroxyaluminum mud to the s...

Embodiment 3

[0040] The third method utilizes hydroxyaluminum mud to remediate Cd, Pb polluted soil in situ, according to the following steps:

[0041] In this example, the alum sludge was dried and ground and placed in a muffle furnace at 5°C min -1 Raise the temperature to 800°C at a constant speed, cool naturally after roasting for 2 hours, wash with water until neutral and dry. The obtained alum mud powder and 3.5molL -1 The NaOH solution was formulated into a solution according to the ratio of solid-liquid 3.5g:10.0mL, and 0.5% Tween-80 was added, heated in a water bath, and the reaction temperature and stirring speed were controlled to be 100°C and 600rmin respectively -1 The reaction time is 4 hours. After the end, it is cooled, precipitated, and washed to neutrality. The solid part is dried and ground to obtain hydroxyaluminum mud , standby; step (2) select the total Cd content 3.0mgkg -1 and full Pb content 700mgkg -1 The polluted soil was used as the soil to be repaired; ste...

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Abstract

The invention provides a heavy metal passivator and a preparation method thereof. The metal passivator is hydroxy alum sludge, and can be used for in-situ restoration of polluted soil of which the total Cd content is at most 5.0 mg kg<-1> and the total Pb content is at most 800 mg kg<-1>. The method for restoring cadmium / lead polluted soil comprises the following steps: before crops are planted in the soil to be restored, applying 50-200kg of the heavy metal passivator to every mou of soil, plowing and mixing uniformly, watering, keeping the soil moist for 4-16 weeks until the effect Cd content in the soil is at most 0.5 mg kg<-1> and the effective Pb content is at most 300 mg kg<-1>, and planting and managing the crops by the conventional process. The heavy metal passivator provided by the invention has the advantages of low raw material cost, simple production technique, high passivation efficiency and stable effect, and can directly, quickly and effectively solve the problems of large Cd and Pb polluted area, low pollution degree and difficulty in soil restoration in the farmland soil in China.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution control, in particular to a heavy metal passivator and a method for preparing and repairing cadmium and lead polluted soil. Background technique [0002] At present, my country's soil heavy metal pollution has affected the quality of cultivated land, food safety and even human health, and the polluted area is increasing. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources issued the "National Soil Pollution Survey Bulletin", which showed that the rate of point pollutants in cultivated land in my country exceeded the standard by 19.4%, and the main pollutants were heavy metals such as cadmium, nickel, copper, and arsenic; in 2011, The Ministry of Agriculture surveyed 2.372 million mu of paddy fields in 88 counties in the key pollution areas of Hubei, Hunan, Jiangxi, and Sichuan provinces. The area exceeded the standard by 1.608 million mu, with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02B09C1/08C09K101/00
Inventor 李凝玉郭彬李华傅庆林丁能飞刘琛林义成
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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