Novel foam separation equipment for restoring heavy metal polluted soil

Abstract

In order to restore heavy metal polluted soil, the invention provides novel foam separation equipment for restoring the heavy metal polluted soil. The whole foam separation equipment is provided with two stages of foam separation towers, firstly, soil to be treated is placed into the primary foam separation tower, a surface active agent mixed solution is uniformly sprayed through an annular water distribution device for soaking the soil, at the same time, the aeration is carried out through a water distribution plate, heavy metals in the soil carry out complexation with the surface active agent through sufficient contact via the stripping effect, complex compounds are attached on air bubbles to be separated from the soil, the air distribution plate is opened after the primary reaction is completed, and soil particles enter the secondary foam separation tower to carry out further separation treatment and to be cleaned. The invention has the advantages of little secondary pollution and high removal rate of heavy metal.

Description

Technical field: [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a novel foam separation device for remediating heavy metal-contaminated soil. Background technique: [0002] At present, there are many kinds of technologies aimed at remediating heavy metal-contaminated soil at home and abroad, which are mainly divided into three types: physical remediation, chemical remediation and biological remediation. Bioremediation is an effective method for remediating heavy metal-contaminated soil developed in the past 20 years, but the remediation time is relatively long. However, the physical repair method is commonly used in engineering practice, but its input cost is relatively high. The chemical remediation method has quick effect and low cost, but the introduced chemical reagents are easy to cause secondary pollution. Therefore, a new method for dealing with heavy metal-contaminated soil is proposed to address th...

AI Technical Summary

Problems solved by technology

The mechanism of action of non-ionic surfactants on the removal of heavy metals in soil is through the complexation of surfactants directly with heavy metals, so the removal efficiency of heavy metals is not high

Foam separation technology has the characteristics of low energy consumption, low investment, convenient operation and maintenance, and good separation effect. It has been widely used in mineral processing, sewage treatment, bioengineering and other fields. However, the foam separation device is applied to the removal of heavy metals in soil Did not see relevant reports

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