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Method for removing multiple heavy metals in underground water by matching modified iron filler with modified zeolite and modified pumice stone

A technology for modifying zeolite and heavy metals, applied in chemical instruments and methods, contaminated groundwater/leachate treatment, water pollutants, etc., can solve the problem of low removal efficiency of heavy metals, and achieve the effect of compact structure and small size

Pending Publication Date: 2022-03-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the removal efficiency of iron powder, pumice and zeolite is not high for heavy metals in water, and to provide a method for removing various heavy metals in groundwater with modified iron filler combined with modified zeolite and modified pumice

Method used

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  • Method for removing multiple heavy metals in underground water by matching modified iron filler with modified zeolite and modified pumice stone
  • Method for removing multiple heavy metals in underground water by matching modified iron filler with modified zeolite and modified pumice stone
  • Method for removing multiple heavy metals in underground water by matching modified iron filler with modified zeolite and modified pumice stone

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A method for removing a variety of heavy metals in groundwater in combination with modified iron fillers and modified zeolite and modified pumice, the method specifically includes:

[0044] Step 1: modify the iron powder, the modification steps are as follows figure 1 shown

[0045] (1) Cleaning iron powder with dilute acid can effectively remove the surface oxide film formed during its manufacture, transportation and storage. Prepare a 0.1-1.0mol / L dilute HCl solution, soak and wash the iron powder in the solution for 5-10 minutes, then wash it repeatedly with distilled water, put it in a dry beaker, pass it through a 100-mesh standard sieve after natural air drying; use 5% activated carbon first Soak in hydrochloric acid for 24 hours, then wash with tap water and pure water until the pH is neutral, dry the activated carbon at 60-100°C, crush it to 80-100 mesh, and put it in a desiccator for use;

[0046] (2) prepare 3% calcium chloride solution, add excessive boric ...

Embodiment 2

[0064] Preparation of modified iron filler: the steps are as shown above, only the sodium alginate modified material A is prepared, and the three materials B / C / D are not prepared;

[0065] The preparation of modified pumice: with embodiment 1 step;

[0066] The preparation of modified zeolite: with embodiment 1 step;

[0067] Combined filling of modified fillers: such as Figure 4 As shown, in the middle filler, put large-size pumice as the skeleton support, and then put A modified iron filler as the main filler for removing heavy metals. The rest are the same as step 1.

[0068] This method can specifically remove Cu(II) in groundwater. A 15mg / L Cu solution was configured and a dynamic experiment was carried out at a flow rate of 2ml / min. The removal efficiency did not decrease significantly after 30 days of operation, and the removal rate was determined to exceed 95% on the 30th day. .

Embodiment 3

[0070] Preparation of modified iron filler: the steps are as above, only chitosan modified material B is prepared;

[0071] The preparation of modified pumice: with embodiment 1 step;

[0072] The preparation of modified zeolite: with embodiment 1 step;

[0073] Combined filling of modified fillers: such as Figure 4 As shown, in the middle filler, put large-size pumice as a skeleton support, and then put B modified iron filler as the main filler for removing heavy metals. The rest are the same as step 1.

[0074] This method can specifically remove Cr(Ⅵ) in groundwater. Configure 2mg / L Cr solution, and conduct dynamic experiments at a flow rate of 2ml / min. The efficiency decline is not obvious between 85-90% in the first 20 days, and the subsequent efficiency gradually decreases, but the removal rate can exceed 70% on the 30th day.

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Abstract

The invention discloses a method for removing multiple heavy metals in underground water by matching modified iron filler with modified zeolite and modified pumice stone, and belongs to the field of underground water treatment. The method comprises the following steps: preparing zero-valent iron, FeCl3 of which the pH is adjusted, pumice stones with different sizes, activated carbon, zeolite, sodium alginate, chitosan, beta-cyclodextrin and hydroxyapatite. Zero-valent iron is pretreated in HCl, then sodium alginate, chitosan, beta-cyclodextrin, hydroxyapatite and other materials are added for modification preparation, and finally four different fillers are prepared. The pumice is calcined in a tubular furnace so as to load zero-valent iron. And the pumice is mixed with FeCl3 so as to load iron. Finally, the pumice stone, the modified iron filler and the zeolite are combined and filled. According to the sequence of the small-size pumice stone, the medium-size pumice stone, the mixture of the modified iron filler, the large-size pumice stone and the zeolite, the small-size pumice stone and the medium-size pumice stone. According to the modified material and the combined filling process, the efficiency of removing the heavy metals in the water can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of heavy metal removal in groundwater, and in particular relates to a method for removing various heavy metals in groundwater by combining modified iron filler with modified zeolite and modified pumice. Background technique [0002] Due to agricultural fertilization, industrial mines and other factors, heavy metals in water seriously exceed the standard. When heavy metals enter the natural environment, they cannot be naturally degraded by microorganisms. At the same time, they will continue to accumulate, and eventually they will directly endanger human health along the food chain or drinking water. For example, Cr(Ⅵ) will enter human cells and cause irreversible damage to organs such as liver and kidney, and Cd will enter the human body and cause symptoms such as acute respiratory failure. This has challenged the safety of drinking water for urban and rural residents and greatly hindered the development of industria...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/70C02F101/10C02F101/20C02F101/22C02F103/06
CPCC02F1/281C02F1/705C02F2101/20C02F2101/22C02F2101/103C02F2103/06
Inventor 王广智李甲乐王维业孙海洋栾晨光陈俊臣王琨黄丽坤
Owner HARBIN INST OF TECH
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