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Persulfate slow-release material used for permeable reactive barrier and preparation method thereof

A osmotic reaction wall, persulfate technology, applied in the direction of alkali metal sulfite/sulfite, chemical instruments and methods, restoration of polluted soil, etc., can solve loss, waste of oxidative materials, loss of permeable reaction Wall service life and other issues to achieve the effect of prolonging service life and reducing costs

Active Publication Date: 2013-06-19
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Reducing metals will only be consumed after chemical reactions with pollutants in groundwater, while the consumption of oxidized solid particles with certain solubility is not only related to the pollutants that react with them, but also lost due to the dissolution of groundwater. In general, the concentration of pollutants in groundwater is low, and the consumption of active medium materials is less, and the oxidizing materials dissolved in groundwater that cannot be consumed will be lost with groundwater, resulting in a great waste of oxidizing materials
In general, the permeable reaction wall needs to be operated in the underground environment for a long time, and the lost oxidizing material will greatly reduce the service life of the permeable reaction wall, which in turn causes a substantial increase in the operating cost of the permeable reaction wall technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take sodium persulfate and calcium peroxide, mix uniformly according to the mass ratio of 1:0.05, and prepare an active oxidant; take ordinary Portland cement and fine sand, mix uniformly according to the mass ratio of 1:0.13, and prepare a stable curing adhesive; Then take the zeolite, and mix it evenly by mass ratio, active oxidant: stable curing binder: zeolite=1: 1.7: 0.5, and finally mix the mixed material with water to granulate, and place it naturally for 24 hours under ventilated conditions After that, the persulfate slow-release material is made.

[0028] Measure 500mL of pure water in a reactor with a volume of 1000mL. In order to simulate the oxygen-depleted condition of groundwater, nitrogen aeration is used to make the dissolved oxygen in high water zero. Take 50g of the prepared persulfate slow-release material and put it into the In the reactor, it is airtightly placed, and the water in the reactor is changed every day, and the water after collecting and ...

Embodiment 2

[0030] Take sodium persulfate and calcium peroxide, and mix them evenly according to the mass ratio of 1:0.07 to prepare an active oxidant; take ordinary portland cement and fine sand, mix them evenly according to the mass ratio of 1:0.15, and prepare a stable curing adhesive; Then take the zeolite, mix it uniformly according to the mass ratio, active oxidant: stable curing binder: zeolite=1: 1.4: 0.7, and finally mix the mixed material with water to granulate, and place it naturally for 24 hours under ventilated conditions After that, the persulfate slow-release material is made.

[0031] Measure 500mL of pure water in a reactor with a volume of 1000mL. In order to simulate the oxygen-depleted condition of groundwater, nitrogen aeration is used to make the dissolved oxygen in high water zero. Take 50g of the prepared persulfate slow-release material and put it into the In the reactor, it is airtightly placed, and the water in the reactor is changed every day, and the water af...

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Abstract

A sustained-release persulfate material for use in Permeable Reactive Barrier, is characterized in that the material is granular and comprises an active oxidant, a stable curable adhesive, zeolite and water in a ratio by mass of 1:1.4-1.7:0.5-0.7:0.9-1.2. The invention also discloses a method for preparing the above sustained-release persulfate material. The sustained-release persulfate material according to the invention can significantly reduce the dissolution rate of the oxidative solid granules- persulfate in Permeable Reactive Barrier, so that the service life of Permeable Reactive Barrier is extended. The oxidant can include calcium peroxide and the adhesive can include Portland cement and fine sands, and the composition can be used for ground water pollution remediation.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration in the field of environmental protection, and in particular relates to a persulfate slow-release material used for treating organic pollutants in a permeable reaction wall. [0002] The present invention also relates to a preparation method of the above-mentioned persulfate slow-release material. Background technique [0003] Organic pollution of groundwater has caused huge health risks to the public, and has attracted the attention of some national governments. According to surveys, more than 130 organic pollutants have been detected in groundwater in some areas of my country, especially in oil extraction, processing, storage and sales. During the process, pollutants such as petroleum hydrocarbons, polycyclic aromatic hydrocarbons, benzene series, and chlorinated organic solvents enter the groundwater due to the leakage of petroleum and its products, causing groundwater pollution a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C04B28/04C02F101/30
CPCC04B2111/00793C02F1/72B09C1/08C04B28/04C04B2111/00284C04B2111/00017C01D5/00C04B22/147C04B2111/00775B09C1/002C02F1/688C02F2103/06
Inventor 姜永海席北斗安达杨昱李鸣晓张进保
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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