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1. WO1990005703 - TRAITEMENT DES EAUX RESIDUAIRES

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

[ EN ]

C L I M S :

1. Process for breaking down so-called hard scum deposits and similar materials In liquid manure and other sewage ducts and/or for separating the dry matter content from liquid manure, domestic and industrial sludge as well as waste products from crops such as flax stalks, c har a c t er i s e d in that the material to be broken down and/or subjected to separation is treated with a cellulose-containing material, preferably straw at least partly broken down by an aqueous plant- and/or wood extract or treated with such an extract alone, whereupon one separates heavy metals or compounds of heavy metals seggregated during treatment as well as relatively coarse and relatively light nutrient-containing particles.

2. Process according to claim 1, c har a c t er i s e d in that the aqueous liquid remaining after separation is conducted through an organic filter material, preferably a layer of cellulose-containing material, in particular straw, partly broken down by the extract.

3- Process according to claim 1 or 2, c har a c t e i s e d in that the separated particles are made use of in a degassification process.

4- Plant- and/or wood extract for use in the process according to each of the preceding claims, c har a c t e r i s e d in that it is produced by extraction of preferably finely dispersed plant- and/ or wood material in water, with a pH value in the region cf the neutral point and at a temperature up to about 30°C, preferably at about room temperature, in that during the extraction an oxygen-containing gas, preferably air, is bubbled through the aqueous extraction medium.

5. Extract according to claim 4. char a c t er i s e d in that it is produced from spruce, birch, hazel, beech, oak, willow, poplar and/or flax, and preferably from Douglas fir.

6. Extract according to claim 4A c h ar a-c t e r i s e d in that it is produced from root parts of heracleum mantegazzianum.

7. Plant for carrying out the process according to each of claims 1-3. c h a r a c t e r i s e d in that it comprises a main vessel with built-in heating devices and an upper inlet for the material to be separated, e.g. liquid manure or sludge, as well as an outlet for purified water phase, an upper vessel arranged above the main vessel and connected with the latter, said upper vessel having a gas outlet and devices for the removal of separated light material as well as a screw conveyer, a first lower vessel arranged below the main vessel and connected with the latter, said first lower vessel
containing cooling devices and devices for the removal of solid matter, as well as a further lower vessel connected with the first-mentioned lower vessel and containing devices for the removal of solid matter.