Process for treating waste water containing chlorinated organic compounds from production of epichlorohydrin
First Claim
1. A process for treating a liquid containing more than 10 mg of adsorbable organic halogen compounds (AOX) per liter comprising the steps ofintroducing said liquid at a pH of 10 to 14 (measured at room temperature) into a reactor and in a first treatment step maintaining a temperature of at least 75°
- C., a pressure of at least 1 bar (abs.) and a residence time of at least 0.5 hours in said reactor, thereby partially dechlorinating or dehydrochlorinating chlorinated organic compounds contained in the liquid;
subsequently subjecting said liquid in a second treatment step to a further dechlorination or dehydrochlorination treatment in the presence of a hydrogen-containing gas, a compound which releases hydrogen or a catalytically active substance, anddischarging the treated liquid.
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Accused Products
Abstract
A process for treating waste water containing chlorinated organic substances, particularly waste water from production of epichlorohydrin which contains more than 10 mg of adsorbable organic halogen compounds (AOX) per liter, comprising charging the waste water at a pH of 10 to 14 (measured at room temperature) into a reactor and maintaining a temperature of at least 75°C., a pressure of at least 1 bar (abs.), and a residence time of at least 0.5 hours in said reactor, thereby partially dechlorinating and/or dehydrochlorinating chlorinated organic compounds contained in the waste water, and thereafter subjecting the waste water to further dechlorination and/or dehydrochlorination treatment in the presence of a hydrogen-containing gas, a hydrogen-releasing compound and/or a catalytically active material; and optionally subjecting the waste water to a biological treatment with the use of microorganisms; and apparatus for carrying out the foregoing process.
53 Citations
14 Claims
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1. A process for treating a liquid containing more than 10 mg of adsorbable organic halogen compounds (AOX) per liter comprising the steps of
introducing said liquid at a pH of 10 to 14 (measured at room temperature) into a reactor and in a first treatment step maintaining a temperature of at least 75° - C., a pressure of at least 1 bar (abs.) and a residence time of at least 0.5 hours in said reactor, thereby partially dechlorinating or dehydrochlorinating chlorinated organic compounds contained in the liquid;
subsequently subjecting said liquid in a second treatment step to a further dechlorination or dehydrochlorination treatment in the presence of a hydrogen-containing gas, a compound which releases hydrogen or a catalytically active substance, and discharging the treated liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- C., a pressure of at least 1 bar (abs.) and a residence time of at least 0.5 hours in said reactor, thereby partially dechlorinating or dehydrochlorinating chlorinated organic compounds contained in the liquid;
Specification