| Patent Number |
Title Of Patent |
Date Issued |
| 7166227 |
Method of treating digested sludge |
January 23, 2007 |
| A method of treating, in wastewater purification, sludge containing organic matter, divalent iron and phosphorus, in which the sludge that is treated is made to contain dissolved iron and phosphorus at a molar ratio Fe:P of above 1:1, the sludge is treated at 0 100.degree. C. with |
| 6852297 |
Method of treating residual acid |
February 8, 2005 |
| A method of treating residual acid from production of chlorine dioxide is described. The method is characterized in that a compound containing iron is added to the residual acid to react therewith and form a product, which contains iron in trivalent form. As iron compound preferably ferr |
| 6746568 |
Treatment of filtrates from peroxide bleaching of pulp |
June 8, 2004 |
| A method in bleaching of pulp is described, in which the pulp is subjected to a peroxide bleaching step, whereupon the pulp is washed and the washing liquid from the washing is separated from the pulp in the form of a filtrate. The method is characterised in that the filtrate is treated |
| 6652756 |
Method of purifying sewage |
November 25, 2003 |
| A method of purifying sewage is described. The method relates to purifying sewage in sewage systems which comprise a toilet, by adding a precipitant for precipitation of phosphates and for binding organic substances. The method is characterized in that the precipitant is selected from th |
| 6531167 |
Process for preparation of nutritional supplement for animals |
March 11, 2003 |
| The present invention relates to a process for preparation of a granular composition, which comprises magnesium and phosphorus. In the process, magnesium oxide is granulated with addition of a granulating liquid, which contains phosphoric acid and water. According to the invention, the |
| 6436181 |
Sizing composition and a method of sizing |
August 20, 2002 |
| A sizing composition and a method of sizing a cellulosic fiber material are disclosed. The sizing composition comprises an aqueous dispersion of a rosin material and a polyaluminium compound, and is characterised in that the polyaluminium compound is a polyaluminium phosphate sulphate co |
| 6306256 |
Retention agent |
October 23, 2001 |
| A method and an agent for improving the retention when dewatering a cellulosic fiber suspension are disclosed In the method, there is added to the suspension a retention agent containing a phenol-formaldehyde resin and a polyethylene oxide, and the method is characterised in that a m |
| 6290812 |
Method for treating process water in connection with pulp bleaching |
September 18, 2001 |
| A method treats process water containing metal ions, in connection with bleaching of lignocellulosic pulp. The method is characterized by the steps of a) adjusting the Mg.sup.2+ content of the process water to form a flocculating base for metals and an organic substance; b) supplying a |
| 6217768 |
Method for treating sludge from wastewater treatment |
April 17, 2001 |
| A method for treating sludge from wastewater purification is described. In the method, a sludge is treated, which contains phosphorus and at least one metal which originates from precipitation chemicals and which is selected among divalent iron and aluminum, the pH of the sludge being |
| 6010630 |
Method for recovering at least one metal from an acidified waste water sludge |
January 4, 2000 |
| A method for recovering at least one metal from an acidified waste water sludge by liquid-liquid extraction by providing an acidified waste water sludge containing ions of at least one metal and organic material, treating the waste water with an oxidizer to convert the organic material |
| 5968229 |
Purification of metal containing solutions |
October 19, 1999 |
| A process for the purification of solutions containing metals comprising neutralization of the solution, reduction of Fe(III) present, and elimination of ingoing dissolved zinc, whereby the ingoing solution containing metals is neutralized using magnetite and/or metallic iron, that t |
| 5888404 |
Method for treating waste water sludge |
March 30, 1999 |
| The invention relates to a method for treating waste water sludge comprising at least one metal originating from a waste water treatment coagulant, and phosphorus and heavy metals in order to recover said at least one metal and phosphorus and to discharge said heavy metals. In this m |
| 5720882 |
Treatment method for waste water sludge comprising phoshorous, heavy metals and at least one met |
February 24, 1998 |
| Waste water sludge which contains phosphorous, heavy metals and at least one metal originating from a waste water treatment coagulant, is treated in order to recover the phosphorous and the at least one metal, and to discharge the heavy metals. The at least one metal includes iron. The |
