Groundwater treatment process
First Claim
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1. A carbon adsorption-free process for extracting halogenated hydrocarbons from a dilute, halogenated hydrocaron-containing aqueous fluid, said process comprising:
- (a) introducing dilute, halogenated hydrocarbon-containing aqueous fluid into an upper portion of an upright enclosed chamber;
(b) introducing a stripping medium into a lower portion of the chamber whereby the stripping medium intimately contacts the dilute, halogenated hydrocarbon-containing aqueous fluid in a countercurrent manner;
(c) removing halogenated hydrocarbon-depleted aqueous fluid from the lower portion of the chamber;
(d) removing a halogenated hydrocarbon rich vapor stream from the upper portion of the chamber;
(e) condensing at least a portion of the halogenated hydrocarbon-rich vapor stream thereby forming a halogenated hydrocarbon-rich liquid portion and a halogenated hydrocarbon-containing non-condensed portion;
(f) contacting at least a portion of the non-condensed portion with an aqueous absorbing fluid whereby the amount of halogenated hydrocarbons in the contacted non-condensed portion is reduced by at least about 85 wt. % based on the initial weight of halogenated hydrocarbons in the non-condensed portion; and
(g) collecting contacted absorbing fluid from step (f) and introducing collected fluid into the upright enclosed chamber.
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Abstract
A continuous process for the extraction of halogenated hydrocarbons from a dilute, halogenated hydrocarbon-containing aqueous fluid, in high efficiency, while dramatically reducing the stripping medium requirement for the extraction and without substantially increasing the amount of halogenated hydrocarbons discharged to the atmosphere.
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Citations
19 Claims
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1. A carbon adsorption-free process for extracting halogenated hydrocarbons from a dilute, halogenated hydrocaron-containing aqueous fluid, said process comprising:
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(a) introducing dilute, halogenated hydrocarbon-containing aqueous fluid into an upper portion of an upright enclosed chamber; (b) introducing a stripping medium into a lower portion of the chamber whereby the stripping medium intimately contacts the dilute, halogenated hydrocarbon-containing aqueous fluid in a countercurrent manner; (c) removing halogenated hydrocarbon-depleted aqueous fluid from the lower portion of the chamber; (d) removing a halogenated hydrocarbon rich vapor stream from the upper portion of the chamber; (e) condensing at least a portion of the halogenated hydrocarbon-rich vapor stream thereby forming a halogenated hydrocarbon-rich liquid portion and a halogenated hydrocarbon-containing non-condensed portion; (f) contacting at least a portion of the non-condensed portion with an aqueous absorbing fluid whereby the amount of halogenated hydrocarbons in the contacted non-condensed portion is reduced by at least about 85 wt. % based on the initial weight of halogenated hydrocarbons in the non-condensed portion; and (g) collecting contacted absorbing fluid from step (f) and introducing collected fluid into the upright enclosed chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A carbon adsorption-free continuous process for extracting halogenated hydrocarbons from a dilute, halogenated hydrocarbon-containing aqueous fluid, said process comprising:
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(a) continuously introducing dilute, halogenated hydrocarbon-containing aqueous fluid into an upper portion of an upright, elongated, enclosed chamber containing contact packing material; (b) continously introducing steam into a lower portion of the enclosed chamber below the contact packing whereby the steam contacts the dilute, halogenated hydrocarbon-containing aqueous fluid in a countercurrent manner within the enclosed chamber; (c) continously removing a halogenated hydrocarbon-depleted aqueous fluid from the lower portion of the enclosed chamber; (d) continously removing a vapor stream containing halogenated hydrocarbon and steam from the upper portion of the enclosed chamber; (e) continuously condensing at least a portion of the halogenated hydrocarbon and steam in the vapor steam from the upper portion of the enclosed chamber thereby forming a halogenated hydrocarbon rich liquid portion and a non-condensed portion; (f) continously contacting at least a portion of the non-condensed portion with an aqueous absorbing fluid whereby the amount of halogenated hydrocarbon is contacted non-condensed portion is reduced by at least about 85wt. % based on the initial weight of halogenated hydrocarbons in the non-condensed portion; and (g) collecting contacted absorbing fluid from step (f) and introducing collected fluid into the upright enclosed chamber. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification