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Preparation method of composite material for fixing heavy metals in water body sediment

A composite material and heavy metal technology, applied in the field of environmental governance, can solve problems such as the inability to effectively control heavy metals, and achieve the effects of simple and easy production, enhanced migration ability, and a wide range of sources

Active Publication Date: 2021-09-07
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although inorganic adsorption materials have many advantages in application, their typical problems still exist, that is, these materials have good ion adsorption performance. If they are used to cover the sediment to control the release of heavy metal ions in the sediment, it needs Different forms of heavy metals are converted into ions to be adsorbed and fixed
Therefore, at present, all kinds of adsorption materials are passive adsorption materials, that is, they cannot actively control heavy metals in sediment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation of a composite material for fixing heavy metals in water body sediment, the steps of the preparation method are as follows:

[0019] (1) Preparation of reed biochar

[0020] Cut the harvested fresh reeds into 1 cm lengths, and dry them at 100°C for 24 hours; weigh 400 g of dried reeds, place them in a 2L glass container, and add 1L of 15% H 3 PO 4 , and submerge the reeds, put them in an oven and soak them at 40°C for 12 hours; Raise the temperature to 400°C / min, place the treated reed in a tubular muffle furnace, and pass nitrogen gas at a rate of 200 mL / min, carbonize for 6 hours, cool to room temperature, and wash with distilled water until the washing liquid is neutral .

[0021] (2) Preparation of coconut shell biochar

[0022] First dry the washed and crushed coconut shells at 100°C for 24 hours; weigh 400g of dried coconut shells, place them in a 2L glass container, add 1L of 30% H 3 PO 4 , and submerge the coconut shell, put it in an oven for...

Embodiment 2

[0026] Utilize the material that embodiment 1 obtains to carry out heavy metal form conversion test and heavy metal ion adsorption test respectively, concrete steps are as follows:

[0027] ① Effect of Calcium Peroxide on Form Transformation of Heavy Metals

[0028] Take the black and smelly bottom mud of a certain river in Suzhou City, add 200g of black and smelly bottom mud to three serum bottles, and add 1g of calcium peroxide powder at the same time and mix well, then add 100mL of the overlying water of the river respectively. Keep it away from light for 30d.

[0029] Use the siphon method to remove the overlying water, take out the bottom mud, dry it, grind it, and pass it through a 100-mesh sieve for later use.

[0030] The results showed that after the calcium oxide oxidation treatment, the percentage of the less stable heavy metal content in the sediment increased significantly, such as Cr increased to 30.61%. In addition, the bioavailability of Cr has different chan...

Embodiment 3

[0038] The composite material for immobilizing heavy metals in the water body sediment prepared in Example 1 was used for the injection test of the contaminated sediment of a certain river in Suzhou.

[0039] The water in this section of the river is black and smelly. The polluted sediment (with a Cr(VI) content of 100.5 mg / kg and an organic matter content of 24.9%) was excavated, sent to the laboratory, and spread on the bottom of two experimental devices (0.6m×0.6m×1.2m). The laying thickness is 50cm. Weigh 800g of composite material and add it into a plastic tube with a diameter of 10cm, then insert the plastic tube into the center of the bottom mud of the experimental device, then slowly pull out the plastic tube, and keep the composite material in the bottom mud, another experimental device is used as a control test. Then, add the channel river water respectively, and the water depth is 50 cm.

[0040] In the system without any material injection, the Cr(VI) content in...

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Abstract

The invention provides a method for preparing a composite material for fixing heavy metals in water body bottom mud, the steps are as follows: (1) Preparation of reed biochar: use 15% H 3 PO 4 Soak, dry after soaking, place the treated reed in a tubular muffle furnace, and pass nitrogen gas at a rate of 200 mL / min, carbonize for 6 hours, cool to room temperature, and wash with water until neutral. (2) Preparation of coconut shell biochar: wash and pulverize coconut shell with 30% H 3 PO 4 After soaking and drying, the treated coconut shells were placed in a tubular muffle furnace, and nitrogen gas was introduced at a rate of 200 mL / min, carbonized for 6 hours, cooled to room temperature, and washed with water until neutral. (3) Preparation of composite materials: calcium peroxide powder, coconut shell biochar, and reed biochar were mixed to obtain composite materials. The composite material strengthens the activation of heavy metals in the sediment, and then immobilizes them with biochar to reduce the migration capacity and bioavailability of heavy metals.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a preparation method of a composite material for fixing heavy metals in bottom mud of a water body. Background technique [0002] At present, although the quality of surface water bodies is gradually recovering with the implementation of sewage interception and comprehensive basin management and control measures, the sediment is the main accumulation place of pollutants, which will be released under suitable environmental conditions, resulting in the pollution of the overlying water. [0003] The control methods of heavy metals in sediment mainly include sediment in-situ remediation technology and sediment dredging. Among them, the sediment in-situ remediation technology has become an important research direction because of its low investment and simple operation, and there are application examples. Among them, in-situ chemical treatment technology is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/06C02F101/20
CPCC02F11/008C02F11/06C02F2101/20
Inventor 李大鹏黄勇李勇
Owner SUZHOU UNIV OF SCI & TECH
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