PRB filler for repairing PB/CD pollution, its preparation method and effect verification method

A technology of straw and fly ash, applied in the field of repairing Pb/Cd polluted PRB filler and its preparation, to achieve the effects of easy acquisition, cost saving and good adsorption effect

Active Publication Date: 2018-03-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of PRB filler for repairing Pb / Cd pollution and its preparation method and effect verification method, to overcome the defect that the above-mentioned prior art exists, the present invention is to the Pb / Cd composite pollution removal rate in groundwater high, has the characteristics of good adsorption effect and low cost, and most of the repair fillers are production waste and agricultural waste, which play a role in waste utilization and greatly save costs. big economic benefits

Method used

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  • PRB filler for repairing PB/CD pollution, its preparation method and effect verification method
  • PRB filler for repairing PB/CD pollution, its preparation method and effect verification method
  • PRB filler for repairing PB/CD pollution, its preparation method and effect verification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1: preparing a solution for simulating Pb / Cd pollution, wherein the concentration of Pb is 5 mg / L, the concentration of Cd is 0.5 mg / L, and the pH of the solution is 6;

[0055] Step 2: According to the flow direction of the solution, in volume fraction, 10% quartz sand, 20% dry straw, 20% fly ash-based zeolite, 20% iron-manganese nodules, 20% fly ash and 10% nylon for quartz sand After the mesh bag is packed, fill it into the PRB reaction device, moisten the filler with pure water and remove air bubbles;

[0056] Step 3: Adjust the experimental temperature to 25°C, use a peristaltic pump to inject the prepared solution into the PRB reaction device at a flow rate of 6 mL / min, take a sample at the water outlet of the PRB reaction device after 12 hours, and test the sample to obtain the experimental results.

[0057] After the reaction, it was measured that the removal rate of Pb in the repaired solution was 96.0%, and the removal rate of Cd was 86.0%.

Embodiment 2

[0059] Step 1: preparing a solution for simulating Pb / Cd pollution, wherein the concentration of Pb is 5 mg / L, the concentration of Cd is 0.5 mg / L, and the pH of the solution is 6;

[0060] Step 2: According to the flow direction of the solution, by volume fraction, 10% quartz sand, 20% composite straw (dry straw and humified straw each account for 10%), 20% fly ash-based zeolite, and 20% iron-manganese nodules , 20% fly ash and 10% quartz sand are packed in nylon mesh bags and filled into the PRB reaction device, wet the filler with pure water and remove air bubbles;

[0061] Step 3: Adjust the experimental temperature to 25°C, use a peristaltic pump to inject the prepared solution into the PRB reaction device at a flow rate of 6 mL / min, take a sample at the water outlet of the PRB reaction device after 12 hours, and test the sample to obtain the experimental results.

[0062] After the reaction, it was measured that the removal rate of Pb in the repaired solution was 98.0%, ...

Embodiment 3～5

[0064] Compared with Example 1, only the test temperature was changed, as shown in Table 1.

[0065] Table 1 Embodiment 3~5 conditions and results

[0066] Example

[0067] It can be seen that at 25°C, the removal rate of Pb / Cd is the highest, Pb is 96.0%, and Cd is 86.0%. With the increase or decrease of temperature, the removal rate of Pb / Cd showed a downward trend. Therefore, at 25°C, the removal rate of Pb / Cd is the highest and the removal effect is the best.

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Abstract

The invention discloses PRB filler for repairing Pb / Cd pollution and a preparation method and an effect verification method thereof. According to the water flow direction and the volume fraction, the filler contains 10% of quartz sand, 20% of dry straw or combined straw, 20% of coal ash-based zeolite, 20% of iron-manganese concretion, 20% of coal ash and 10% of quartz sand arranged in sequence. The PRB filler has a high removal rate for Pb / Cd combined pollution in underground water and has the advantages of being good in adsorption effect, low in cost and the like; the repair filler is mostly production waste and agricultural waste, so that waste utilization is achieved, cost is greatly saved, problems existing in the prior art are solved, and high economic benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of remediation of groundwater heavy metal pollution, and in particular relates to a PRB (permeable reactive wall) filler for remediating Pb / Cd pollution, a preparation method and an effect verification method thereof. Background technique [0002] With the rapid development of industry and the sharp increase of human activities, a large amount of waste water containing lead (Pb), cadmium (Cd) and other heavy metals produced by papermaking, mining, electronics, chemical industry and other industries not only pollutes surface water, but also Pollution of soil and groundwater resources is also becoming more and more serious. As groundwater is an important source of drinking water, Pb / Cd polluted groundwater will directly cause harm to the life and health of humans, animals and plants, and even lead to death. Therefore, how to control heavy metal Pb / Cd compound polluted groundwater has become the most urgent en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F1/28C02F101/22C02F103/06
CPCC02F1/283C02F3/327C02F2101/22C02F2103/06C02F2201/004
Inventor 范春辉高雅琳
Owner SHAANXI UNIV OF SCI & TECH
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