The vendor of the technology being evaluated must be informed whether the compounds to be treated are nonhalogenated or halogenated. In most instances, the vendor needs to know the specific compounds involved so that modifications to technology designs can be made, where appropriate, to make the technology successful in treating nonhalogenated compounds.
One or more of the fluid phases gaseous, liquid, aqueous, or immiscible may occupy the pore spaces in the unsaturated zone. Residual bulk liquid may be retained by capillary attraction in the porous media i. Residual saturation of bulk liquid may occur through a number of mechanisms. Volatilization from residual saturation or bulk liquid into the unsaturated pore spaces produces a vapor plume.
Lateral migration of this vapor plume is independent of ground water movement and may occur as a result of both advection and diffusion. Advection is the process by which the vapor plume contaminants are transported by the movement of air and may result from gas pressure or gas density gradients.
Diffusion is the movement of contaminants from areas of high vapor concentrations to areas of lower vapor concentrations. Volatilization from contaminated ground water also may produce a vapor plume of compounds with high vapor pressures and high aqueous solubilities. Since no acidic gas may be released into the environment the gas has to be washed neutral.
There is no difference if the waste contains halogenated solvents or if halogenfree solvents are contaminated with halogen-containing reagents. Even the presence of sodium chloride changes a mixture of non-halogenated solvents into halogencontaining solvent waste. But the institute will run into trouble if on the other hand halogen-containing waste is labelled as halogen-free, because then it seemes to the staff of the disposal company that special treatment of the smoke gas ist not needed.
Springe direkt zu Inhalt. Halogenated solvents and nonhalogenated solvents Be careful!
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