Soil conditioner and method for controlling mercury pollution

A soil conditioner and mercury pollution technology, which is applied in the field of soil conditioner to control mercury pollution, and can solve the problems of lack of research on mercury pollution remediation materials in farmland

Active Publication Date: 2020-06-12
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies of existing technologies in mercury-contaminated soil remediation and treatment methods and the lack of research on farmland mercury-contaminated remediation materials

Method used

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  • Soil conditioner and method for controlling mercury pollution
  • Soil conditioner and method for controlling mercury pollution
  • Soil conditioner and method for controlling mercury pollution

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0105]The examples of this group provide a method for preparing a soil conditioner for controlling mercury pollution. The raw materials are mixed in proportion and then subjected to heat preservation and maintenance, grinding and sieving to prepare a powdery soil conditioner, which can achieve the effect of each component. The best ratio and the best conditions, grinding and sieving can make the soil conditioner particles uniform and increase the surface area, which is conducive to fully combining with the soil and exerting effects; the raw materials include: limestone powder, organic carbon powder, calcite powder, quartz stone powder , Sepiolite powder.

[0106] Further, the raw materials also include: biomass ash and selenium fertilizer.

[0107] In some embodiments, mixing the raw materials refers to: mixing the following raw materials in parts by weight; the raw materials include the following parts by weight: 20-50 parts of limestone powder, 2-13 parts of organic carbon p...

experiment example 1

[0141] Take mercury-contaminated farmland soil in a certain area of ​​Tongren, Guizhou. The average mercury content in the soil is 11.76mg / kg. The concentration is 12.74ug / L.

[0142] (1) Naturally air-dry the mercury-contaminated farmland soil, grind it through a 100-mesh sieve, and remove larger stones and other debris;

[0143] (2) Get mass ratio 40% limestone powder, 10% organic carbon powder, 20% calcite powder, 10% quartz stone powder and 20% sepiolite powder and mix and make soil conditioner (moisture content 15%). The soil conditioner was tested for mercury at 0.2ppb, arsenic at 0.02ppm, cadmium at 0.6ppmb, and lead at 0.2ppm.

[0144] (3) Add the mercury-contaminated farmland soil conditioner to the mercury-contaminated farmland soil according to the addition amount of 0.5%, add water to about 35% moisture content, and keep it standing for 7 days under this condition. "(HJ557-2010) for leaching. The soil pH value and mercury leaching concentration were tested befor...

experiment example 2

[0151] In this example, the mercury-contaminated farmland soil is repaired and potted. The same soil as in Example 1 is taken. The average mercury content in the soil reaches 11.76mg / kg. The soil sample was leached, and the concentration of mercury in the leachate was 12.74ug / L. The specific process is as follows:

[0152] (1) Operate according to (1) and (2) in Example 1, then the organic fertilizer of soil conditioner, farmland soil and mass ratio 5%-8% is stirred and mixed, and the stirring adopts a miniature cement mixer, and the time is 3 minute.

[0153] (2) Put the stirred farmland soil into pots, the height of the potting bucket is 22.8cm, the diameter of the upper opening is 20.5cm, the diameter of the bottom of the bucket is 16.5mm, and 5kg of farmland soil with mixed conditioner is used, and 3 repetitions are adopted.

[0154] (3) Add water until the water content is 20%-50%, adjust the pH value to 6-7 with quicklime, and place it for 3 days for stabilization and ...

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Abstract

Belonging to the technical field of heavy metal contaminated soil remediation, the invention relates to a soil conditioner for treatment of mercury pollution and a method. The soil conditioner comprises limestone powder, organic carbon powder, calcite powder, quartz stone powder and sepiolite powder. The soil conditioner provided by the invention uses natural ores as the raw materials, and has nosecondary pollution to farmland soil. The natural ore powder contains natural ingredients which can be subjected to chemical reaction with Hg to form a stable compound or chelate. The conditioner madeof natural ore raw materials does not destroy the existing structure of farmland soil, and has little influence on the physical and chemical properties of farmland soil, and at the same time also contains nutrient elements needed for crop growth. The soil conditioner not only can promote the stabilization and immobilization of mercury, but also can promote the growth and development of crops.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and relates to a soil conditioner and a method for controlling mercury pollution. Background technique [0002] Mercury, commonly known as "mercury", is a relatively rare element in the earth's crust and the only liquid metal. Mercury (Hg) is one of the most toxic heavy metal elements in the environment, which is harmful to the human body. There are many ways for it to enter the soil, including mercury mining, industrial wastewater and domestic sewage discharge, atmospheric deposition, and the use of pesticides and fertilizers. According to the "National Soil Pollution Survey Bulletin", the rate of exceeding the standard for mercury alone in the country's soil is as high as 1.6%. Soil mercury pollution is widespread and widespread. [0003] Mercury in soil migrates and diffuses over time and undergoes chemical form transformation. Different forms of mercury and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08A01B79/02C09K101/00C09K109/00
CPCA01B79/02B09C1/08C09K17/40C09K2101/00C09K2109/00
Inventor 蒋俊邢汉君李晶罗文连曹兴
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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