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Passivator for treatment of heavy metal pollution of soil and preparation method of passivator

A pollution control and heavy metal technology, applied in the field of soil remediation, can solve the problems of destroying plant tissue and function, chlorophyll structure plant decline, reducing plant yield and quality, etc., to achieve the goal of reducing mobility, good passivation effect, and good repair effect Effect

Inactive Publication Date: 2020-05-19
浙江慧丰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heavy metals also have a strong toxic effect on crops growing in the soil. The impact is: on the one hand, heavy metals can damage some tissues and functions of plants, thereby reducing the yield and quality of plants. For example, excessive cadmium content in the soil will damage the chlorophyll of plant leaves. When the copper and zinc content in the soil exceeds a certain limit, the roots of the crop will be seriously damaged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of passivating agent that is used for soil heavy metal pollution control that the present embodiment provides comprises 10 parts of dewatered sludge, 10 parts of lime, 15 parts of clay minerals, 15 parts of straw rotting residue and 40 parts of modified biochar by weight, Wherein the modified biochar is biochar loaded with nano-hydroxyapatite, and the proportion of the above-mentioned nano-hydroxyapatite in the modified bio-char is 5%.

[0023] The preparation step of above-mentioned passivating agent comprises the following steps:

[0024] In the first step, sludge dehydration will concentrate the sludge in the qualified rural sewage treatment system or septic tank, dehydrate the water content below 75%, stack and naturally dry to obtain dewatered sludge;

[0025] The second step is the preparation of modified biochar. Firstly, plastic, metal and bone impurities in wheat straw, rice straw and rice husk are removed, and then the raw materials after preliminary sort...

Embodiment 2

[0032] The passivator used in the treatment of heavy metal pollution in soil provided in this example comprises 20 parts of dewatered sludge, 15 parts of lime, 20 parts of clay minerals, 10 parts of straw rot and 30 parts of modified biochar in parts by weight.

[0033] The implementation methods adopted by the passivator include in-situ or ex-situ stirring and mixing. According to the characteristics of the soil, soil repair integrated machines, mixing buckets, rotary jetting, and rotary tillers can be selected. The addition ratio is 1-10%, and the application rate is 200-800kg per mu. Combined with effective field planting management at the same time of application, the heavy metals in crop grains can meet the requirements of the standards in the "National Food Safety Standard Food Contaminant Limits" (GB2762-2017).

[0034] The performance index of the product obtained in this embodiment: particle size 1-2mm, pH value of 10% aqueous solution 7.5-8.5, particle moisture conte...

Embodiment 3

[0036] The present embodiment provides a passivator for soil heavy metal pollution treatment, which includes 15 parts of dewatered sludge, 18 parts of lime, 20 parts of clay minerals, 18 parts of straw rot and 35 parts of modified biochar in parts by weight.

[0037] The implementation methods adopted by the passivator include in-situ or ex-situ stirring and mixing. According to the characteristics of the soil, soil repair integrated machines, mixing buckets, rotary jetting, and rotary tillers can be selected. The addition ratio is 1-10%, and the application rate is 200-800kg per mu. Combined with effective field planting management at the same time of application, the heavy metals in crop grains can meet the requirements of the standards in the "National Food Safety Standard Food Contaminant Limits" (GB2762-2017).

[0038] The performance index of the product obtained in this embodiment: particle size 1-2mm, pH value of 10% aqueous solution 7.5-8.5, particle moisture content ...

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Abstract

The invention discloses a passivator for treatment of heavy metal pollution of soil. The passivator comprises the following components in parts by weight: 10 to 20 parts of dewatered sludge, 10 to 15parts of lime, 15 to 20 parts of clay minerals, 10 to 15 parts of rot straw slag and 30 to 40 parts of modified biochar. The passivator for treatment of heavy metal pollution of soil prepared in the invention is applicable to soil remediation at heavy metal polluted sites. The main components of the passivator are all natural materials; no secondary pollution is generated; the passivator has a good passivating effect on heavy metals in farmland soil, can increase the organic matter content and the cation exchange capacity of the soil, prevent and treat soil hardening, effectively improve soiltexture, adjust soil porosity, provide necessary nutrient substances for microbial survival, improve the physical and chemical properties and microbial flora of the soil and enhance the production potential of the soil.

Description

technical field [0001] The invention relates to soil remediation, in particular to a passivator for soil heavy metal pollution control and a preparation method thereof. Background technique [0002] In recent years, due to the impact of various factors, such as water pollution, air pollution, transportation, and the development of mineral deposits, soil pollution has become more and more serious. Several incidents related to heavy metal pollution have occurred in China, including cadmium rice, cadmium wheat, and blood lead exceeding the standard. Soil heavy metal pollution has become an important factor affecting social stability and residents' health. [0003] Soil heavy metal pollution does not show harmfulness to the environment within a certain period of time. When its content exceeds the soil's bearing capacity or limit, or when the soil environmental conditions change, heavy metals may activate the soil and cause serious ecological hazards. It is called "chemical pollu...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 张利娟余振翼
Owner 浙江慧丰环保科技有限公司
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