Remediation of organics contaminated groundwater by ozone micro-nano bubble

Abstract

Nowadays groundwater contamination widely spreads in China. Organic pollutants are of the public concern since they are toxic and with long life cycle, causing considerable remediation cost. The innovative remediation technologies are urgently needed. In this paper, the micro-nano bubbles (MNBs) technology with the ozone oxidation method was proposed, and laboratory tests were conducted for both surface water and groundwater remediation to degrade methyl orange, which was selected as the representative pollutant. In the test, deionized water was used to configure methyl orange solution of certain concentration, then the concentrations of methyl orange were monitored during the treatment process of ozone macro bubbles, oxygen MNBs, and ozone MNBs. Glass beads with the diameter of 4.0-4.5 mm were selected to simulate highly permeable soils, and the concentrations of both methyl orange and the dissolved ozone were measured during groundwater remediation process by ozone MNBs. The results indicated that oxygen MNBs did not degrade methyl orange, while the degradation effect of ozone bubbles was obvious. The degradation effect of ozone MNBs can even be 41 times greater than ozone macro bubbles for polluted surface water. The groundwater remediation tests further verified that ozone MNBs have significant capability in the remediation of organic contaminated subsurface.