A method for in-situ continuous soil restoration using zero-valent nano-iron

Abstract

The invention provides an in-situ continuous remediation method through zero-valent nanometer iron. Ferric salt, cellulose, lithium chloride, N,N-dimethylacetamide, polyhydric alcohols, trifluoroacetic acid and ionic liquid are prepared into a spinning solution, after spinning, linear zero-valent nanometer iron is formed through reduction, cellulose composite filaments obtained through electrostatic spinning and glass fiber are entwisted, a reduction sieve net with rhombus mesh holes is manufactured and installed on a movable refining machine, heavy metal ions are rapidly reduced and collectedin the soil in-situ refining process, the heavy metal ions are thoroughly separated from soil, and therefore in-situ continuous soil remediation is achieved. By means of the in-situ continuous remediation method through the zero-valent nanometer iron, the problem that by means of an ordinary method, it is hard for the nanometer zero-valent iron to be effectively dispersed in soil is solved; the reduction efficiency of the heavy metal ions is high, the heavy metal ions in the soil can be reduced and thoroughly separated from the soil, the reduction and separation process and the soil refiningprocess are synchronously carried out, operation can be simplified, and energy sources can be saved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to soil remediation by nano-iron, in particular to a method for in-situ continuous soil remediation by using zero-valent nano-iron. Background technique [0002] In recent years, due to the rapid growth of population and the rapid development of industry, solid wastes are continuously stacked and dumped on the soil surface, harmful waste water is continuously infiltrated into the soil, and harmful gases and floating dust in the atmosphere are also continuously falling into the soil with rainwater, resulting in soil pollution. . There are four main types of soil pollution: chemical pollutants, physical pollutants, biological pollutants and radioactive pollutants. Among them, soil heavy metal pollution is especially harmful and has a deep impact. Since heavy metals cannot be decomposed by soil microorganisms, they have low mobility and are easy to accumulate in the soil. Whe...

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Problems solved by technology

[0009] According to the above, the in-situ remediation technology in the existing scheme has a long repair period and is difficult to control. The ex-situ remediation technology affects soil reuse and has high cost. However, in the traditional soil remediation technology combined with nanometer zero-valent iron, it is difficult to agglomerate because it is prone to agglomeration. Nano zero-valent iron is effectively dispersed in the soil, and the high surface area performance cannot be displayed. In addition, it is very easy to oxidize and surface passivation, which prevents the reaction from proceeding further, resulting in low reduction efficiency, and also causes a considerable loss of nano-zero-valent iron. , and the heavy metals after reduction can only be fixed temporarily, and it is difficult to separate them from the soil

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