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Dense, Nonaqueous Phase Liquid, organic contaminants denser than water and do not dissolve or mix easily with water immiscible. It forms a separate phase pools in water. The pools containing chlorinated aliphatic solvents, chlorinated benzenes and phenols, polycyclic aromatic hydrocarbons and polychlorinated compounds serve as a long-term source for dissolved contaminant plumes. It is usually not easy to locate and identify them. Some of the DNAPL compounds can migrate through the clay layers as well providing a hazard for not only the subsurface waters but for the waters in the deeper layers as well. The following technologies can be used for the treatment: in situ thermal treatment, in situ bioremediation, in situ chemical oxidation = ISCO, application of co-solvents and tenzides to dissolve the ontaminants in the ground water, than pump and treat. Without additives the remediation of DNAPL-contaminated sites by pump and treat technology is time- and cost consuming.

extraction of LDNAPL from soil
High Density Nonaqueous Phase Liquid HDNAPL
High Density Nonaqueous Phase Liquid. See as DNAPL.
Low Density, Non Aquaeous Phase Liquid LDNAPL or NAPL