Unlock instant, AI-driven research and patent intelligence for your innovation.

Composite curing agent for cadmium-lead polluted farmland remediation and preparation method thereof

A composite curing agent and lead pollution technology, applied in the field of soil remediation, can solve the problems of soil property impact, easy environmental impact, poor remediation effect, etc., and achieve the effect of avoiding adverse effects, good curing effect, and good remediation effect.

Inactive Publication Date: 2020-10-30
河南省环境保护科学研究院
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a composite solidifying agent for repairing cadmium-lead polluted farmland and its preparation method, which has the advantages of good repairing effect, high stability, improved soil fertilizer supply and fertilizer retention capacity and low cost, so as to solve the problems commonly used in the market. The repairing effect of the curing agent is poor, it is easily affected by the environment, and affects the properties of the soil, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite curing agent for cadmium-lead polluted farmland remediation and preparation method thereof
  • Composite curing agent for cadmium-lead polluted farmland remediation and preparation method thereof
  • Composite curing agent for cadmium-lead polluted farmland remediation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Modified tobacco stalk biochar was applied to the soil at a rate of 5% per 100 g of soil.

Embodiment 2

[0037] Example 2: Modified tobacco stalk biochar, humic acid and superphosphate are applied to the soil after being compounded in proportions of 5%, 3% and 2% per 100g of soil.

Embodiment 3

[0038] Embodiment 3: Humic acid and superphosphate are applied to the soil after being compounded in proportions of 3% and 2% respectively in every 100g of soil.

[0039] 1. The test soil of the present invention is located in a block A in Henan Province, which covers an area of ​​34.6 square kilometers and has extremely superior mineralization geological conditions. Historically, 24 mining rights have been set up in this mining area. Because of the disorderly mining and serious waste of mineral resources in the past, the ecological environment in the area has been damaged and polluted to a certain extent. One of the most prominent environmental problems is that the heavy metal content in the soil in the area is seriously exceeded. Cd and Pb are the most serious heavy metals exceeding the standard.

[0040] The soil samples for testing were taken from plot A in the area by grid sampling method. When sampling, the soil samples of the cultivated land layer at a depth of 0-20 c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a composite curing agent for cadmium-lead polluted farmland remediation. The composite curing agent comprises the following components in parts by weight: 5 parts of modified tobacco straw biochar, 3 parts of humic acid and 2 parts of calcium superphosphate. A preparation method of modified tobacco straw biochar comprises the following steps: (1) cleaning tobacco straws, naturally air-drying, crushing, carrying out constant-temperature treatment at 80 DEG C for 24 hours, cooling, taking out, and compacting in a crucible, (2) putting the crucible into a muffle furnace, setting the muffle furnace to be heated to 400 DEG C at a heating rate of 5 DEG C / min, keeping the temperature constant for 2 hours, taking out the crucible after cooling, and sieving the crucible witha 100-mesh sieve, and (3) adding 10 g of tobacco straw biochar into 100 mL of NaOH solution, uniformly shaking, oscillating for 24 hours at the constant temperature of 70 DEG C, washing for three times by using a NaHCO-solution, repeatedly washing for multiple times by using deionized water until the pH value is stable, continuously drying for 24 hours at the temperature of 110 DEG C, cooling, taking out and drying. The method has the advantages of being good in remediation effect, high in stability, capable of improving the soil fertilizer supply and conservation capacity and low in cost.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a composite curing agent for remediation of cadmium and lead polluted farmland and a preparation method thereof. Background technique [0002] The problem of soil pollution by heavy metals is a key and difficult issue of concern to society and the people. In view of the current pollution situation of agricultural land in Henan Province, most of the polluted agricultural land is lightly polluted or moderately polluted, and there are few heavily polluted farmlands. Therefore, it is the current soil pollution prevention and control work in Henan Province to effectively treat and restore these farmlands that are slightly or moderately polluted by lead and cadmium, so that they can reach below the soil background value or reduce the pollution level so that the plots can be safely used. top priority. According to the soil type and hydrogeological conditions of our province, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C05G3/80C01B32/05C09K101/00C09K109/00
CPCC05B1/02C09K17/40C09K2101/00C09K2109/00C01B32/05C05G3/80C05D9/00C05F11/02
Inventor 化勇鹏李海华兖少锋王珂珂鄂正阳陈洁朱远航易军郝益民
Owner 河南省环境保护科学研究院