Preparation of integrative cubes as a novel biological permeable reactive barrier medium for the enhancement of in situ aerobic bioremediation of nitrobenzene-contaminated groundwater
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Recent studies have indicated that in situ aerobic bioremediation is one of the most effective methods for remediating groundwater contaminated with nitrobenzene (NB). Aerobic bioremediation is largely dependent on the maintenance of adequate dissolved oxygen (DO) levels in the groundwater. Traditional in situ aeration has various disadvantages, such as high operational costs and nonuniform aeration. In this study, integrative cubes were prepared and utilized as a novel biological permeable reactive barrier (bio-PRB) medium to enhance the aerobic bioremediation of NB-contaminated groundwater. The results revealed an NB removal rate greater than 98.68% after 15–20 days of continuous oxygen release from the bio-PRB medium. DO concentrations reached 8.0 mg/L during treatment, and NB-degrading bacteria were able to tolerate a range of pH conditions. This multifaceted bio-PRB medium can simultaneously adsorb and biodegrade NB, release oxygen, and neutralize the pH with phosphate buffer. The results of this study suggest that this bio-PRB medium represents a highly effective in situ bioremediation method for NB-contaminated groundwater.
KeywordsBioremediation Groundwater Nitrobenzene Oxygen-releasing compounds Permeable reactive barrier
Biological permeable reactive barrier
Polyvinyl alcohol and biochar
Polyvinyl alcohol and microorganisms
Polyvinyl alcohol, biochar and microorganisms
Scanning electron microscope
This study was supported by the Joint Foundation of Key Laboratory of Institute of Hydrogeology and Environmental Geology, CAGS (KF201609) and Science and Technology Development Project of Jilin Province (20160520076JH).
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