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A Ferrous Activated Persulfate Slow-release Candle for In-Situ Oxidation and Restoration of Groundwater

A technology of persulfate and in-situ oxidation, which is applied in the direction of oxidized water/sewage treatment, etc., can solve the problem of synergistic slow release of oxidant and activator at the same time, achieve good repair effect and long-term stability, and improve the prevention of clogging Ability, the effect of improving in-situ oxidation ability

Inactive Publication Date: 2019-11-12
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no materials and methods that simultaneously solve the synergistic slow release of oxidants and activators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Prepare ferrous activated persulfate slow-release candles according to the aforementioned steps and the following requirements. Oxidant slow-release layer: oxidant: sodium persulfate, 100 mesh, 35% by mass, 22.4g; dispersant: fly ash, 32mesh-60mesh, 35% by mass, 22.4g; coagulant: fully refined paraffin, The melting point is 64°C, the mass ratio is 30%, 19.2g; the diameter of the oxidizing agent slow-release layer is 2cm, and it is cut into lengths of 1.5cm. Activator slow-release layer: activator: ferrous sulfate heptahydrate, zero-valent iron powder, high-iron fly ash molar ratio: 1:0.2:0.2, mass ratio 35%, 20.9g; dispersant: fly ash, Mass proportion 35%, 32 mesh-60 mesh, 20.9g; coagulant: fully refined paraffin wax, mass proportion 30%, melting point 64°C, 17.9g; activator slow-release layer diameter 2cm, and cut into length 1.5cm specifications. The specifications of the finally prepared ferrous-activated persulfate slow-release candle are: 2 cm in diameter and 6 cm ...

Embodiment 2

[0046] The preparation method of the oxidant slow-release layer and the activator slow-release layer is the same as in Example 1. The diameter of the oxidant slow-release layer is 2cm, and it is cut into a length of 2cm; the diameter of the activator slow-release layer is 2cm, and it is cut into a length of 2cm; the final preparation of the ferrous activated persulfate slow-release candle is: 2cm in diameter, 8cm in length .

Embodiment 3

[0048] Prepare ferrous activated persulfate slow-release candles according to the aforementioned steps and the following requirements. Oxidant slow-release layer: oxidant: sodium persulfate, 100 mesh, 35% by mass, 19.5g; dispersant: fly ash, 50-100 mesh, 20% by mass, 11.1g; coagulant: fully refined paraffin, The melting point is 60°C, the mass ratio is 45%, 25.1g; the diameter of the oxidant slow-release layer is 2cm, and it is cut into a size of 1cm in length. Activator slow-release layer: activator: ferrous sulfate heptahydrate, zero-valent iron powder, high-iron fly ash molar ratio: 1:0.2:0.2, mass ratio 35%, 18g; dispersant: fly ash, mass Proportion 20%, 50 mesh-100 mesh, 10.3g; coagulant: fully refined paraffin wax, mass ratio 45%, melting point 60°C, 23.1g; activator slow-release layer diameter 2cm, and cut into lengths of 1cm. The specifications of the finally prepared ferrous-activated persulfate slow-release candle are: 2 cm in diameter and 8 cm in length.

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Abstract

The invention discloses a ferrous activation persulfate slow-release candle for underground water in-situ oxidation restoration. The ferrous activation persulfate slow-release candle is in a cylindrical shape, is prepared from oxidizers, activators, dispersing agents and coagulators, and is formed by sequentially melting and connecting an oxidizer slow release layer and an activator slow release layer; the activators are persulfates; the activators consist of ferrous ion compounds, zero-valent iron powder and high iron powder coal ash, and have the ferrous and magnet self activation function. After the ferrous activation persulfate slow-release candle is in contact with water, the self activation can be realized; the controllable sulfate radical free radical flow release capability is realized, so that the candle is applicable to the underground water in-situ oxidation restoration of different organic pollution fields.

Description

technical field [0001] The invention relates to the technical field of groundwater restoration, in particular to a ferrous activated persulfate slow-release candle for in-situ oxidation restoration of groundwater. Background technique [0002] In-situ chemical oxidation (ISCO) remediation technology is an important remediation technology for controlling groundwater pollution. Commonly used chemical oxidants include ozone, Fenton’s reagent, hydrogen peroxide, permanganate and persulfate, among which persulfate is due to its powerful It has attracted much attention due to its excellent oxidation ability, stable and long-lasting effect, and wide pH applicability. Persulfate is relatively stable under general conditions, and the effect of using it alone is not obvious, but under common activation conditions such as heating, transition metal ions, and strong alkaline environment, it can produce strong oxidizing sulfate radicals. The oxidation-reduction potential is 2.6V, which c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72
CPCC02F1/72
Inventor 马会强李爽姜虎生石珍瑜詹琪师鹏飞
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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