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A zero-valent iron-activated persulfate slow-release candle for in-situ oxidation remediation of groundwater

A persulfate, in-situ oxidation technology, applied in the direction of oxidized water/sewage treatment, etc., to improve the ability to prevent clogging, good repair effect and long-term stability, and improve the effect of in-situ oxidation

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

[0006] There are no related materials and methods for groundwater remediation using zero-valent iron activators and persulfate oxidants for synergistic slow-release oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Zero-valent iron-activated persulfate sustained-release candles were prepared following the preceding steps and the following requirements. Oxidant slow-release layer: oxidant: sodium persulfate, 100 mesh, mass ratio 35%, 22.4g; dispersant: fly ash, 32 mesh-60 mesh, mass ratio 35%, 22.4g; coagulant: fully refined paraffin, The melting point is 64°C, the mass ratio is 30%, 19.2g; the diameter of the oxidant slow-release layer is 2cm, and it is cut into a size of 1.5cm in length. Activator sustained-release layer: Activator: the mass ratio of zero-valent iron powder and high-speed iron fly ash is 10:1, the mass ratio is 75%, 63.4g; the dispersant: fly ash, the mass ratio is 10%, 20 mesh-40 Mesh, 8.4g; coagulant: fully refined paraffin, mass ratio 15%, melting point 64°C, 12.7g; activator sustained-release layer diameter 2cm, and cut into lengths of 1.5cm. The specifications of the final prepared zero-valent iron-activated persulfate slow-release candle are: diameter 2cm a...

Embodiment 2

[0046] The preparation methods of the oxidant slow-release layer and the activator slow-release layer are the same as those 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 zero-valent iron-activated persulfate slow-release candle is: diameter 2cm, length 8cm.

Embodiment 3

[0048] Zero-valent iron-activated persulfate sustained-release candles were prepared following the preceding steps and the following requirements. Oxidant slow-release layer: oxidant: sodium persulfate, 100 mesh, mass ratio 35%, 19.5g; dispersant: fly ash, 50 mesh-100 mesh, mass ratio 20%, 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 length of 1cm. Activator sustained-release layer: Activator: zero-valent iron powder, high-speed iron fly ash mass ratio of 10:1, mass ratio 70%, 112g; dispersant: fly ash, mass ratio 10%, 32 mesh-60 mesh , 16g; coagulant: fully refined paraffin, mass ratio 20%, melting point 60 ℃, 32g; activator sustained-release layer diameter 2cm, and cut into lengths of 1cm specifications. The specifications of the final prepared zero-valent iron-activated persulfate slow-release candle are: 2 cm in diameter and 8 cm in length.

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Abstract

The invention discloses a zero-valence iron activated persulfate sustained-release candle for in-situ oxidative remediation of underground water. The candle is cylindrical and comprises an oxidant, an activating agent, a dispersing agent and a coagulator and is formed by sequentially melting and connecting an oxidant sustained-release layer and an activating agent sustained-release layer, wherein the oxidant is persulfate, and the activating agent comprises zero-valence iron powder and high-iron fly ash and has a zero-valence iron and magnetic self-activating function. The zero-valence iron activated persulfate sustained-release candle has the advantages that the candle can be self-activated when making contact with water, has controllable sulfate radical sustained-release capability, and is applicable to the in-situ oxidative remediation of the underground water of different types of organic pollution sites.

Description

technical field [0001] The invention relates to the technical field of groundwater restoration, in particular to a zero-valent iron-activated persulfate slow-release candle for in-situ oxidation and restoration of groundwater. Background technique [0002] In situ chemical oxidation (ISCO) remediation technology is an important remediation technology to control groundwater pollution. Commonly used chemical oxidants include ozone, Fenton reagent, hydrogen peroxide, permanganate and persulfate, among which persulfate is due to its strong It has attracted much attention because of its high oxidative ability, stable and long-lasting effect, and wide pH applicability. Persulfate is relatively stable under general conditions, and its effect is not obvious when used alone. However, under common activation conditions such as heating, transition metal ions, and strong alkaline environments, it can generate strong oxidizing sulfate radicals. Its standard The redox potential is 2.6V, ...

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任建新
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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