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US 7,611,638 B2Granted
Method of purifying polluted water
AssigneeRecticel
InventorsAlain Neyt, Luc Wouters
Life of this patent
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AssigneeRecticel
InventorsAlain Neyt, Luc Wouters
Estimating the term…
In a first treatment step part of at least one difficulty biodegradable or non-biodegradable organic compound is oxidized in polluted water by bringing said polluted water into contact with an ozone containing gas. The effluent is subsequently diluted with an aqueous liquid before a second treatment with ozone is carried out. If the concentration of the organic compound is still not sufficiently low, the treated effluent is diluted again and subjected to a further treatment with ozone. It was found that a more effective ozone treatment was obtained by the dilution or dilutions and that in particular no pH control was needed, so that no formation of additional salts occurred.
A method to purify polluted water containing a first concentration of at least one difficultly biodegradable or non-biodegradable organic compound, in which method the above mentioned organic compound is oxidized by bringing the polluted water into contact with at least one ozone containing gas, characterized in that in a first treatment step part of the above mentioned organic compound present in the polluted water is oxidized by bringing said polluted water into contact with the above mentioned ozone containing gas in such a way that the first concentration of said organic compound is reduced to a second concentration, the entire amount of said organic compound present in the polluted water being reacted with ozone for a total of at least 20 minutes in said first treatment step, after the first treatment step the second concentration of said organic compound is reduced by dilution with an aqueous liquid to a third concentration which is at most two thirds of the second concentration, and in a second treatment step a further part of the above mentioned organic compound present in the polluted water is oxidized by bringing the diluted polluted water into contact with the above mentioned ozone containing gas in such a way that the third concentration of said organic compound is reduced to a fourth concentration, the entire amount of said organic compound present in the diluted polluted water being reacted with ozone for a total of at least 20 minutes in said second treatment step.
Dependencies are inferred from the claim text.