Study On The Remediation Of Fluorene Contaminated Soil Using Enhanced Electric Technology

The sedimentation of atmospheric pollutants,the abuse of pesticides,sewage irrigation,and the residue of industrial waste are behaviors that cause serious soil pollution.Soil pollution is mainly divided into two types:heavy metal pollution and organic matter pollution.Electric remediation technology is an emerging and efficient soil remediation method,which can be used for both heavy metal contaminated soil and organic contaminated soil remediation,and is welcomed by many scholars.This article takes fluorene in organic pollutants as the research object,artificially simulates the configuration of contaminated soil,and uses self-made electric devices to repair the contaminated soil.Firstly,traditional electric remediation work was conducted on contaminated soil,and the effects of voltage gradient and remediation period on remediation effectiveness were investigated;On the basis of selecting the optimal voltage gradient and repair cycle,enhanced repair experiments were conducted by adding non ionic surfactant TW-80 and anionic surfactant SDBS to the electrolyte through"cathodic acid control"to investigate the electric enhanced repair effect of contaminated soil;Finally,prepare Fe⁰@g-C₃N₄ Activator materials were characterized using SEM,TEM,XRD,FTIR,XPS,and other methods,investigate Fe⁰@g-C₃N₄ the degradation effect of activated sodium persulfate on pollutants in the aqueous phase and its application in EK-ISCO technology for electrokinetic remediation of contaminated soil are summarized as follows:（1）The larger the voltage gradient and the longer the repair period,the higher the total removal rate of pollutants;After the remediation,the p H value of the soil from anode to cathode gradually increased,and the residual pollutants in the soil were enriched in the middle area.By comparing the total removal rate and energy consumption of pollutants under different voltage gradients and repair cycles,the voltage gradient of 1.0 V/cm and the repair cycle of 5 days were selected as the best parameters for electric repair,with the total removal rate of 41.09%and energy consumption of 51.816 W·h.（2）Under the condition of“cathodic acid control”,the range of acid migration zone in soil is enlarged,which is beneficial to the desorption and migration of pollutants in soil,and the total removal rate of pollutants in soil is increased to 46.38%;Under the condition of surfactant concentration of 1000 mg/L,the total removal rate of pollutants in TW-80 group is 51.24%,that in SDBS group is 47.08%,and the total removal rate of pollutants in TW-80 group is higher than that in SDBS group,which indicates that adding nonionic surfactant TW-80 to the electrolyte is the best strengthening method under the condition of“cathodic acid control”.（3）The prepared Fe⁰@g-C₃N₄activated material was characterized,which showed that Fe⁰ was successfully loaded on the skeleton g-C₃N₄;The effect of activating sodium persulfate to degrade fluorene was investigated.It was found that the effect of Fe⁰@g-C₃N₄ material group was higher than that of Fe⁰ group and g-C₃N₄ group.The more activator is put into the system,the higher the concentration of sodium persulfate solution is,and the better the degradation effect is.At the same time,the Fe⁰@g-C₃N₄material also has a wider p H application range.Combined with EK-ISCO technology,the total removal rate of pollutants in soil is 50.45%.