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Zero-valence iron activated persulfate sustained-release candle for in-situ oxidative remediation of underground water

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

Inactive Publication Date: 2017-03-08
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]Prepare zero-valent iron activated persulfate slow-release candles according to the previous 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: mass ratio of zero-valent iron powder and high-iron fly ash is 10:1, 75% by mass, 63.4g; dispersant: fly ash, 10% by mass, 20 mesh-40 Mesh, 8.4g; coagulant: fully refined paraffin wax, 15% by mass, melting point 64°C, 12.7g; activator slow-release layer with a diameter of 2cm, and cut into lengths of 1.5cm. Finally, the specifications of the zero-valent iron activated persulfate slow-release candle are: 2 cm in diameter and 6 cm in length.

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; 8cm.

Embodiment 3

[0048] Prepare zero-valent iron activated persulfate slow-release candles according to the previous 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: mass ratio of zero-valent iron powder and high-iron fly ash is 10:1, 70% by mass, 112g; dispersant: fly ash, 10% by mass, 32-60 mesh , 16g; coagulant: fully refined paraffin wax, 20% by mass, melting point 60°C, 32g; activator slow-release layer with a diameter of 2cm, and cut into lengths of 1cm. The finally prepared zero-valent iron-activated persulfate slow-release candle has the following specifications: a diameter of 2 cm and a length of 8 cm.

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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 Applications(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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