C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 3/02 (2006.01) C02F 3/12 (2006.01)
Patent
CA 2353952
The invention relates to the utilization of oil-in-water emulsions for reducing the air and/or oxygen requirement of aerobic biological sewage treatment plants and/or for improving denitrification in aerobic biological sewage treatment plants. As a constituent of the oil phase, the emulsions contain at least: saturated or unsaturated, open-chain or cyclic, normal or isomeric hydrocarbons with 8-30 carbon atoms; saturated or unsaturated fatty alcohols, a saturated or unsaturated fatty acid, fatty acid monoalkylesters, fatty acid amides, or fatty acid monoalkylamides, of saturated or unsaturated fatty acids, whereby the fatty alcohols, fatty acids and fatty acid esters comprise the constructed compounds of 8-30 carbon atoms; monoesters or polyesters of a saturated or unsaturated carboxylic acid or dicarboxylic acid with 4-30 carbon atoms and with a monoalcohol and/or a polyol extracted from polyethylenegycols; polyamides of saturated or unsaturated fatty acids with 8- 30 carbon atoms and aliphatic polyamines with 2-6 nitrogen atoms; acyclic, preferably monocyclic and/or bicyclic terpenes, in particular, terpene hydrocarbons and/or a terpene alcohol and/or polyoxyalkylene compounds based on alkylene oxides and fatty alcohols and/or C12-C18 fatty acids and/or fatty acid glycerides of C12-C18 fatty acids.
L'invention concerne l'utilisation d'émulsions du type huile dans l'eau en vue de réduire les besoins en air et/ou en oxygène d'installations de décantation biologiques en aérobie et/ou d'améliorer la dénitrification dans de telles installations. Les émulsions renferment, comme constituant de la phase huileuse, au moins des hydrocarbures de 8 à 30 atomes de carbone, saturés ou insaturés, à chaîne ouverte ou cyclique, normaux ou isomères; des alcools gras saturés ou insaturés, un acide gras saturé ou insaturé, un monoalkylester d'acide gras, un amide d'acide gras ou un monoalkylamide d'acide gras, provenant d'acides gras saturés ou insaturés, les alcools gras, les acides gras et esters d'acides gras renfermant les composés précités de 8 à 30 atomes de carbone; des mono- ou polyesters d'un acide carboxylique ou dicarboxylique de 4 à 30 atomes de carbone, saturé ou insaturé, et d'un monoalcool et/ou d'un polyol, à l'exception du polyéthylèneglycol; des polyamides d'acides gras de 8 à 30 atomes de carbone, saturés ou insaturés, et de polyamines aliphatiques de 2 à 6 atomes d'azote; des terpènes acycliques, de préférence monocycliques et/ou bicycliques, en particulier des hydrocarbures terpéniques et/ou un alcool terpénique, et/ou des composés polyalkylène à base d'alkylène-oxydes et d'alcools gras et/ou d'acides gras en C¿12?-C¿18? et/ou de glycérides d'acides gras en C¿12?-C¿18?.
Mielke Klaus
Schulte Johann
Webers Uwe
Werres Joachim
Borden Ladner Gervais Llp
Stockhausen Gmbh & Co. Kg
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