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Method for stabilizing heavy metal lead in bottom mud by virtue of chlorapatite-loaded charcoal composite material

A chloroapatite and composite material technology, which is applied in biological sludge treatment, chemical instruments and methods, water pollutants, etc. High problems, to achieve clean and pollution-free practical application value, reduce bioavailability, stabilize the effect of heavy metal lead

Inactive Publication Date: 2017-11-07
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chloroapatite is prone to agglomeration and precipitation, resulting in low reactivity and mobility, and thus poor stabilization of heavy metals
Due to the shortcomings of chloroapatite, such as limited solubility, large particles, and inability to migrate under natural conditions, it has been limited in practical applications.
In the existing research, using surfactants (such as sodium lauryl sulfate and rhamnolipid) as modified materials, the problem of easy agglomeration of chloroapatite can be solved to a certain extent by modifying chloroapatite. The problem is that the heavy metals in the sediment can be transformed from an unstable form to a stable residue state, but the above-mentioned modified chloroapatite materials still have the following problems in the actual application process: (1) The unstable form of heavy metals The proportion is still high, that is, the proportion of the stable residue state needs to be further increased; (2) It has a certain poisonous effect on the microorganisms in the sediment, and even kills the microorganisms, that is, it affects the microbial ecological environment in the sediment.

Method used

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  • Method for stabilizing heavy metal lead in bottom mud by virtue of chlorapatite-loaded charcoal composite material
  • Method for stabilizing heavy metal lead in bottom mud by virtue of chlorapatite-loaded charcoal composite material
  • Method for stabilizing heavy metal lead in bottom mud by virtue of chlorapatite-loaded charcoal composite material

Examples

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Effect test

Embodiment 1

[0038] A method for stabilizing heavy metal lead in bottom mud by using a biochar composite material loaded with chloroapatite includes the following steps:

[0039] The lead-containing bottom mud is air-dried, ground, and passed through a 100-mesh sieve to obtain the crushed lead-containing bottom mud with a particle size of ≤150μm, a pH of 7.98, and the heavy metal lead in weak acid extraction state (F1), reducible state (F2), The content of oxidizable state (F3) and residue state (F4) were 8.2%, 11.1%, 60.5%, and 20.2%, respectively. Take 0.3g of the biochar composite material loaded with chloroapatite and 5mL of ultrapure water, add 0.5g of the above crushed lead-containing bottom sludge and mix evenly, shake and react for 30d at 25℃, complete the treatment of lead-containing bottom sludge Stable processing. The BCR continuous extraction method was used to determine the content of the four forms of heavy metal lead in the bottom mud. The detection results are listed in Table...

Embodiment 2

[0055] A method for stabilizing heavy metal lead in bottom mud by using a biochar composite material loaded with chloroapatite includes the following steps:

[0056] The lead-containing bottom mud is air-dried, ground, and passed through a 100-mesh sieve to obtain the crushed lead-containing bottom mud with a particle size of ≤150μm, a pH of 7.98, and the heavy metal lead in weak acid extraction state (F1), reducible state (F2), The content of oxidizable state (F3) and residue state (F4) were 8.2%, 11.1%, 60.5%, and 20.2%, respectively. Take 0.3g of the biochar composite material loaded with chloroapatite and 5mL of ultrapure water, add 0.5g of the pulverized lead-containing bottom sludge and mix uniformly, shake and react for 30 days at 25°C to complete the treatment of the lead-containing bottom sludge. Stable processing. The BCR continuous extraction method was used to determine the content of the four forms of heavy metal lead in the bottom mud. The detection results are lis...

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Abstract

The invention discloses a method for stabilizing heavy metal lead in bottom mud by virtue of a chlorapatite-loaded charcoal composite material. The method comprises the step of carrying out vibration on the chlorapatite-loaded charcoal composite material and lead-containing bottom mud, so as to finish the stabilization of the lead-containing bottom mud, wherein the chlorapatite-loaded charcoal composite material contains charcoal and chlorapatite, and charcoal is loaded with chlorapatite. The method for stabilizing heavy metal lead polluted bottom mud by virtue of the chlorapatite-loaded charcoal composite material has the advantages of good stabilization effect, simplicity and convenience in operation, low in cost, cleanness, no pollution and high practical application value and can be directly utilized in actual field remediation.

Description

Technical field [0001] The invention belongs to the field of physical and chemical treatment of heavy metals in polluted sediments, and specifically relates to a method for stabilizing heavy metal lead in sediments by using a biochar composite material loaded with chloroapatite. Background technique [0002] With the acceleration of economic globalization and the rapid development of industry and agriculture, environmental pollution caused by heavy metal emissions has gradually become prominent, which directly threatens human health and survival. The heavy metal pollution of soil and bottom sludge mainly comes from industrial and agricultural production (such as smelting and chemical production), the discharge of domestic sewage, and the use of large amounts of pesticides and fertilizers. Studies have shown that the migration and transformation of heavy metals in the bottom sludge and the extent of their toxicity to organisms and the environment are closely related to the occurre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/02C02F101/20
Inventor 万佳莫丹曾光明黄丹莲邓锐胡亮黄超薛文静文晓凤王荣忠任晓雅叶淑静刘希贵
Owner HUNAN UNIV
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