Abstract: The present invention relates to a method for treatment of sludge in water purification, the method comprising the steps: providing an enzyme mixture comprising at least one enzyme capable of digesting natural polymeric materials; and adding the enzyme mixture and at least one chelating reagent, in optional order or simultaneously, to an aqueous sludge suspension.

Abstract: The present invention relates to a method for supplying oxygen to a water purification process, said method comprising providing an oxygen carrier of at least one copolymer of dimethylsiloxane, ethylene oxide and propylene oxide, adding said oxygen carrier to the water purifying process, and contacting said oxygen carrier with an oxygen containing gas. The invention further relates to the use of at least one copolymer of dimethylsiloxane, ethylene oxide and propylene oxide, as an oxygen carrier in a water purification process.

Abstract: A method for the preparation of sodium percarbonate granules having enhanced stability, comprising modifying the surface of the sodium percarbonate granules by a surface reaction between sodium percarbonate and carbon dioxide or bicarbonate species to form a dense solid film of essentially sodium bicarbonate on the surface of the sodium percarbonate granules, the method comprising the steps of: a) dissolving carbon dioxide in water to form an aqueous solution containing dissolved carbon dioxide and bicarbonate, b) exposing the surface of the sodium percarbonate granules to a spray of the aqueous solution containing dissolved carbon dioxide and bicarbonate, to form the solid film of essentially sodium bicarbonate, and subsequently c) removing the residual fluid from the surface.

Abstract: A process for the manufacturing of a pressure vessel made from a thermoplastic material or a thermosetting resin. The vessel comprises a first and a second vessel end part, and possibly an intermediate tube part. The vessel end parts include a circumfering shell (4) and each one dome (3). A number of partition and load distributing walls (5) stretch from the domes (3) towards the open part of each vessel end part. The possible intermediate tube part includes similar walls (5). The edges of the walls (5) will meet when the different parts are joined. A number of cells (6) are formed between the walls (5). A number of crossing areas are formed between intersecting walls (5). At least one crossing area is provided with a determination by achieving a hole (14) from the outside of the dome. The hole (14) is bigger than the crossing area and has a depth greater than thickness of the dome part (3).