METHOD AND SYSTEM USING MICRO/NANO BUBBLES FOR ENHANCED IN SITU REMEDIATION OF POLLUTED GROUNDWATER

摘要

Provided is a method using micro/nano bubbles for enhanced in situ remediation of polluted groundwater, comprising: arranging a water injection pipe (7) at an upstream location of an area where groundwater is polluted; introducing thereto a micro/nano bubbles-containing water having nutrient salt(s) therein; transferring the micro/nano bubbles-containing water having nutrient salt(s) with the movement of groundwater to the polluted area, decomposing organic pollutants or continuously replenishing electron acceptor(s)/donor(s) for microorganisms to facilitate the degradation and removal of the organic pollutants; meanwhile, arranging a water extraction pipe (17) at the downstream of the polluted area to extract water and form a groundwater flow-field; setting up a monitoring well for real-time monitoring and analyzing of parameters during the removal process of the organic pollutants and adjusting the occurrence time and the amount of aeration of the micro/nano bubbles. Also provided is a system using the micro/nano bubbles for enhanced in situ remediation of the polluted groundwater. The micro/nano bubbles have a great oxygen-supplying effect, a long duration, and a large influence area, compensate for deficiencies of regular in situ remediation technologies such as natural degradation and bioventing, are of reduced costs and energy efficient, and are applicable in remediation of sites with a limited area and a high pollution load.

主权项

1. A method for enhanced in situ remediation of polluted groundwater by using micro/nano bubbles, characterized in that,
setting up one or more water injecting wells at an upstream location of an area where groundwater is polluted, generating micro/nano bubbles-containing water via a micro/nano bubble aeration equipment using a gas and water, and adding nutrient salt(s) to the micro/nano bubbles-containing water, which is then introduced into the groundwater system through the water injecting well; transferring and dispersing the micro/nano bubbles and the nutrient salt(s) with the movement of the groundwater, directly decomposing organic pollutants or continuously replenishing electron acceptor(s)/donor(s) and nutrient salt(s) for microorganisms to facilitate the degradation and removal of the organic pollutants; setting up one or more water pumping wells at an downstream location of the area where the groundwater is polluted, pumping out the groundwater and conducting a treatment on the ground using a physical method, a chemical method or a biological method, forming an artificial groundwater flow-field to control the transfer range of the micro/nano bubbles by pumping in order to improve overall remediation efficiency and prevent the pollution range from extending; arranging multiple monitoring wells, which are communicated with the ground, at various locations of the area where the groundwater is polluted, performing real-time monitoring and analyzing of various parameters during the removal process of the organic pollutants by using the monitoring wells, and, on the basis of the analysis results, adjusting the occurrence time and the amount of aeration of the micro/nano bubbles as well as the artificial groundwater flow-field.