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1. WO2000032882 - PROCEDE DE PURIFICATION DES EAUX USEES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A method of purifying sewage in sewage systems which comprise a toilet (1) by adding a precipitant, c h a r a c t e r i s e d in that the precipitant is selected from the group consisting of iron salts and aluminium salts and is adapted to be flushed with water in the bowl (3) when flushing.
2. A method as claimed in claim 1, c h a r a c -t e r i s e d in that the precipitant is solid and suspended from the edge (11) of the toilet.
3. A method as claimed in claim 1, c h a r a c t e r i s e d in that the precipitant is liquid and is dosed in the bowl (3) when flushing.
4. A method as claimed in claim 3, c h a r a c t e r i s e d in that the dosage is affected by activation of the flushing device (4) of the toilet or by the water level sinking when flushing.
5. A method as claimed in any one of the preceding claims, c h a r a c t e r i s e d in that the sewage from the toilet (1) is conducted to the sludge separator through an outlet pipe (5, 8) which leads to the lower part of the sludge separator (6) below its outlet (7) .
6. A method as claimed in any one of the preceding claims, c h a r a c t e r i s e d in that the iron salts and aluminium salts are selected from the group consisting of sulphates, chlorides and nitrates.
7. A method as claimed in any one of the preceding claims, c h a r a c t e r i s e d in that the precipitant is dosed in an amount exceeding that required for precipitation of the phosphates in the sewage from the toilet (1) .