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Heavy metal passivator and method for preparing and remediating cadmium and lead polluted soil

A technology of heavy metal passivation agent and lead pollution, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of high production cost, complicated process, unsuitable for large-scale production, etc., and achieve passivation High chemical efficiency, simple production process, and reduced absorption effect

Inactive Publication Date: 2018-01-26
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 method for preparing and remediating cadmium and lead polluted soil
  • Heavy metal passivator and method for preparing and remediating cadmium and lead polluted soil
  • Heavy metal passivator and method for preparing and remediating cadmium and 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) 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 resulting alum mud powder was mixed with 0.5 mol L -1 The NaOH solution was formulated 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 600r min 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 sludge, which is set aside;

[0030] (2) The choice of in-situ remediation of Cd and Pb contaminated soil with hydroxyaluminum mud: the total Cd content is 1....

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 2.0mol L -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 600 r min, 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, which is set aside;

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

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 3.5mol L -1 The NaOH solution was prepared 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 at 100°C and 600 r min, 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 sludge for later use; in step (2), the total Cd content is selected to be 3.0 mg kg -1 and full Pb content 700 mg kg -1 The polluted soil was used as the soil to be repai...

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Abstract

The invention provides a heavy metal passivator and a preparation method thereof. The metal passivator is hydroxyaluminum sludge, which can be used for in-situ remediation of polluted soil with a total Cd content≦5.0mgkg-1 and a total Pb content≦800mgkg-1. Before planting crops in the soil to be repaired, apply the heavy metal passivator to the surface at an amount of 50-200 kg / mu, turn tillage and mix well, water, and keep the soil moist for 4-16 weeks until the effective state in the soil When the Cd content≦0.5mgkg‑1 and the available Pb content≦300mgkg‑1, the crops can be planted and managed according to conventional methods. The heavy metal passivator provided by the present invention has low raw material cost, simple production process, high passivation efficiency and stable effect, and can directly, quickly and effectively solve the problem of large Cd and Pb pollution in my country's farmland soil, but the pollution degree is not high. Difficult problems of soil restoration.

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 Patents(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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