Gas separation: processes – Degasification of liquid – Plural successive degassing treatments
Patent
1993-08-26
1994-10-04
Spitzer, Robert
Gas separation: processes
Degasification of liquid
Plural successive degassing treatments
95247, 95263, 95266, 96189, 96198, 96202, 2611141, B01D 1900
Patent
active
053522761
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to water remediation. More particularly, the invention relates to a portable, modular stripping system usable to treat contaminate water on site, and an associated method of use.
BACKGROUND OF THE INVENTION
Remediation of contaminated water, such as hydrocarbon-contaminated groundwater which is the subject of an environmental clean-up project, can be achieved with an air stripper system, including a vertical stripping tower, installed temporarily at the site. The contaminated water is introduced to the top of the tower and caused to flow downwardly by force of gravity, while stripper air is introduced from the bottom of the tower and caused to flow upward. The mixing of water and air that occurs during this countercurrent flow results in the transfer of the contaminants from the water to the airstream. Relatively clean water collects at the bottom of the tower which can be re-used, e.g., re-introduced to the ground. The contaminated airstream exits the top of the tower and is typically treated to remove the contaminants prior to emission of the air to the atmosphere. The degree to which the contaminants are removed from the water is dependent upon tactors such as the height of the stripper tower and the volume of stripper air passed through the tower. In general, an increase in decontamination effectiveness is achieved by increasing tower height and air flow volume. The economics of such remediation and the difficulties of maintenance of units at remote locations are of important concern, as are esthetics in many instances.
SUMMARY OF THE INVENTION
The invention provides a low physical profile remediation system having a compact, modular air stripping unit that enables easy servicing and low-cost operation, and which is aesthetically more pleasing than high towers. One aspect of the invention comprises a water air stripper system usable to treat contaminated water such as at an outdoor site in residential areas near filling stations. the air stripper system usable with a blower arranged to cause air flow upwardly through the stripper unit, the water air stripper system comprising a vertical assembly of limited vertical height of a series of individually demountable tray units mounted above one another, the bottom of each tray unit comprised of air-porous medium defined by a sheet member having air-flow apertures, the apertures having a diameter of about 0.100 inch or less to prevent the flow of water therethrough at zero or minimal airflow through the apertures under conditions of equality between the head of water in the tray above the aperture and the opposing pressure differential of the air below and above the respective tray, each tray constructed to retain water for a period of time during stripping action caused by air passing upwardly through the apertures, water entry means and exit means respectively at the top and bottom of the water air stripper system, and water-flow guiding means to guide the water at a relatively shallow depth over each stage of air-porous media, thence downwards to the next stage; and air inlet and outlet conduits respectively at the bottom and top of the unit.
Another aspect of the invention comprises a water air stripper unit usable to treat contaminated water at a remediation site, the stripper unit comprising a vertically-extending interfitting nest of demountable tray frames, each tray frame having a porous bottom member which is removable from the frame and an internal baffle that defines a tortuous water flow path laterally across the bottom member of each tray, the baffles extending respectively between and substantially sealed to, the undersurface of the next above tray bottom member and the upper surface of the tray bottom member in which the baffle resides.
Another aspect of the invention comprises a water air stripping unit usable to treat contaminated water at a remediation site, the stripper unit comprising a vertical assembly of limited vertical height of a series of individually demountable tray units, and
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Farrow Paul
Gerade Jeffrey H.
Powers Gary R.
Rentschler Dennis
Szabo Steven
Sippican, Inc.
Spitzer Robert
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