Efficient degradation of phenol contamination in groundwater based on in-situ infiltration enhancement with ultrasound treatment
In recent years,the situation of groundwater pollution caused by petroleum organic pollutants has become increasingly serious.In the traditional in situ chemical oxidation remediation technology,the migration and diffusion of chemicals are significantly affected by the permeability and heterogeneity of aquifers.The key to improve the influence radius of remediation agents and the efficiency of pollutant remediation is to find an effective in situ infiltration method.Ultrasound enhanced permeability technology has the advantages of small disturbance to the environment,no secondary pollution and simple installation of the device.Ultrasound technology is widely used in areas such as improving permeability of coal rocks and oil seams as a way to enhance gas and oil recovery.However,there are few reports on the application of ultrasound in groundwater in-situ remediation,and the effect of infiltration enhancement and remediation mechanism still need to be studied in depth.Therefore,by applying ultrasound treatment to two different aqueous media,comparative analysis of changes in pore size and pore connectivity,potassium permanganate transmission rate,and phenol degradation efficiency in media before and after sonication.To elucidate the mechanism of action and influencing factors of ultrasound in-situ infiltration enhancement,and to explore the degradation kinetics of organic pollutants based on ultrasound in-situ infiltration enhancement.The results showed that the main factors affecting the effect of ultrasound in-situ infiltration enhancement and the degradation efficiency of organic pollutants were ultrasound action power,media particle size,ultrasound mode of action and groundwater velocity.The effect of ultrasound in-situ infiltration enhancement increased with the increase of ultrasound power and media particle size.By applying 500 W ultrasound treatment to the medium for 150 min,the transmission rate of potassium permanganate can be maximized up to 3.02 times.In addition,when the groundwater velocity was 8.59 cm·d-1,ultrasound pretreatment mode of action can maximize the phenol remediation efficiency from 78.61％to 91.45％.This study explored the mechanism of ultrasonic in-situ infiltration enhancement on the transfer rate of remediation chemicals and the efficiency of pollutant remediation.It can provide reliable theoretical basis and technical support for developing the application prospect of in-situ groundwater remediation technology.
ultrasoundin-situ infiltration enhancementorganic pollutants in groundwaterdecomposition mechanismkinetics
万方数据
维普
