Change in enzymatic activity in Tween80-enhanced phytoremediation of polychlorinated biphenyl-contaminated soil

摘要

A pot experiment was conducted to study the effectiveness of remediation using a combination of Tween80 and alfalfa, as well as the enzyme responses involved in remediating polychlorinated biphenyls (PCBs)-contaminated soil. The results indicated that the degradation percentage of PCBs in contaminated soil was up to 53.8% after a 90 day culture in Tween80-enhanced phytoremediation, which was 25.2% more than that only by phytoremediation. The activities of urease, polyphenoloxide and hydrogen peroxide generally increased gradually with an increase in the planting time and Tween80 supplementation. This was attributed to the Tween80 stimulating the release of more root exudates into the PCBs-contaminated soil, improving the number and diversity of microbes and thereby enhancing enzymatic activity.