Stripping methods are able to extract a multitude of contaminants from contaminated water with the help of air. In packed columns or horizontal stripping systems, an intensive contact of water with stripping air is achieved so that the contaminants are stripped by air. Depending on the efficiency degree required for the respective purification, the systems are designed as one stage, multiple stages or as series.
The following substances can be removed from water right to the detection limit
- halogenated hydrocarbons, e.g. PERC, TCE, DCE, VC…
- halogenated aromatic compounds, e.g. chlorobenzene, dichlorobenzene …
- aromatic compounds, e.g. benzol, toluol, xylol, styrol, ethyl benzene…
- petroleum-derived hydrocarbons
- MTBE
- naphthalene
- ammoniac
- carbon dioxide
- hydrogen sulphide
Depending on the specific requirements, we employ packed columns or horizontal stripping systems.
Large amounts of water up to 200 m³/h are cleaned by our well-proven and robust packed columns.
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If stripping systems are to be fitted into buildings or containers, then we use horizontal stripping systems. In horizontal stripping systems, the water does not flow through the stripper top-down (as in packed columns), but horizontally. This explains why their total height is low and why it is possible to fit them into standard-sized containers.
Since horizontal stripping systems have no packed beds, there is no need for the complex purification or exchange of the packing. To clean packed columns, one usually needs an appropriate service platform or a crane. The horizontal stripper can be cleaned without the use of scaffoldings or lift systems.
Advantages of Horizontal Stripping Systems
- high efficiency degree of the purification
- the installation in containers or rooms is possible
- inconspicuous outward appearance
- no foundation, no wiring
- easy frost protection
- easy to protect from unwanted access
- easy maintenance
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Purification of Stripping Air
The waste air of stripping systems usually undergoes purification. Depending on the composition of the contaminants, we employ our activated carbon filters >> oder unser MINICAT >>.
Vacuum Stripping Systems
Stripping is usually carried out under atmospheric pressure. However, if contaminants which are hardly or not at all adsorbed by activated carbon (e.g. DCE or VC) are to be removed from water, then vacuum stripping is an economical alternative.
In the vacuum, the volatility of the contaminants is increased considerably. This has the effect that vacuum strippers function with a much smaller amount of stripping air than conventional stripping systems. Under atmospheric pressure, the required stripping air is only 1/20 of the stripping air which is usually needed. Accordingly, the stripping air contains a higher concentration of contaminants.
The small amount of stripping air and the high concentration of contaminants constitute ideal preconditions for the economical use of a MINICAT >>. Contaminants like DCE and VC are easy to decompose by catalytic oxidation.
Vacuum stripping can be used with both packed columns and a horizontal stripper.
Combinations of Methods
Should the water to be treated have, for instance, a high iron or lime content, then, if necessary, we install deferrisation systems >> or systems for lime stabilisation ahead of our stripping systems. Contaminants which cannot be removed by stripping (e.g. PAK or phenole) are removed by downstream activated carbon filters for water treatment >>..