Field-scale demonstration of a permeable reactive barrier treatment system: Nitrate as a terminal electron acceptor.

摘要

This research project focused on engineered bioremediation of a hydrocarbon plume using nitrate as the terminal electron acceptor. A permeable reactive barrier was installed in a shallow, anoxic plume with low levels of nitrate, in a sand aquifer. The site chosen for the field demonstration was a well-characterised plume emanating from a fuel dispensing facility where the underground storage tanks had been removed. NAPL remained in the sub-surface. Observed contaminants included BTEX, trimethylbenzene, and naphthalene. Pre-fabricated concrete cylinders (briquettes) provided the slow release of nitrate within the permeable reactive barrier. The addition of nitrate to the contaminated groundwater enhanced biodegradation.; The research project was conducted in two phases. The objectives of phase one were the design, installation, hydrogeological characterisation and initial monitoring of the treatment system. Phase two focused on assessing the performance of the treatment system over time, and on determining the biodegradation mechanisms within the treatment system. (Abstract shortened by UMI.)