Abstract: The invention relates to a method for treating a liquid sample, which comprises disturbing iron and at least one organic compound of interest. The, the method comprises addition of a reagent comprising an ammonium salt, alkali metal salt or earth alkali metal salt of hexacyanoferrate to the sample. Iron in the sample is allowed to interact with the reagent and to form a reaction product, the reaction product of iron is separated from the sample, and the amount of the at least one compound of interest is determined from the sample. The invention relates also to use of salt of hexacyanoferrate.

Abstract: A coating structure for a sheet-like substrate is disclosed including cellulosic fibres and a sheet-like product. The structure includes at least one pre-coat layer and a top coat layer, where the pre-coat layer(s) and the top coat layer include 10-90 weight-% of a styrene (meth)acrylate copolymer which is polymerised in the presence of a stabiliser, and which has a glass transition temperature Tg?20° C., preferably ?15° C., more preferably ?13° C. Furthermore, the pre-coat layer(s) includes a polysaccharide, such as starch, and the top coat layer includes 5-60 weight-% of at least one water-soluble coating binder, which is selected from polysaccharides and polyvinyl alcohols, as well as at most 5.0 weight-% of a cross-linker, which reacts with —OH or —COOH groups.

Abstract: A method and apparatus for monitoring deposit formation in a process having an aqueous flow is provided. According to exemplary embodiments, a feed flow of an aqueous liquid is provided onto a receiving surface to be monitored. At least part of a receiving surface is illuminated with at least one light source. Visual data is collected across the receiving surface and analyzed. The quality and type of deposition attached to the receiving surface is classified based on information obtained from the analyzed visual data, and a quantitative scaling and/or fouling indication is computed based on the classification.

Abstract: The present embodiments generally relate to the treatment of produced water such as produced water resulting from an industrial process such as one involving the use of copious amounts of water and the addition of one or more polymers such as viscosifying or thickening polymers, in particular enhanced oil recovery processes or another processes resulting in polymer flooded produced water. These treatment methods include contacting the produced water with one or more reducing agents and one or more metals, wherein said treatment may result in a reduction of the viscosity of said produced water and/or the degradation of polymers which are contained therein.

Abstract: A method for manufacturing a fibrous web, such as web of paper, board, tissue or the like is disclosed. The method includes obtaining at least one fibre suspension of lignocellulosic and/or cellulosic fibres and feeding the fibre suspension into an intermediate residence entity. The fibre suspension including bacterial endospores, is discharged out of the intermediate residence entity via an outlet after a residence time of at least 2 hours in the intermediate residence entity and after a time delay the fibre suspension is formed into a fibrous web. Bacterial endospores are sensitized by adding a germinant surfactant including a primary or secondary ammonium head group and a linear unsubstituted C12-alkyl tail, to the fibre suspension at an addition point located at a lower part of the intermediate residence entity or after the outlet of the intermediate residence entity, but before the formation of the fibrous web.

Abstract: The invention relates to a water-soluble polymer composition obtained by polymerizing in an aqueous polymerisation medium, which comprises degraded starch, at least following monomers: acrylamide and/or methacrylamide, and >2 mol-% of at least one unsaturated mono- or dicarboxylic acid(s) or salts thereof. The polymer composition has an anionic net charge at pH 7 and a dry solids content of >5 weight-%. The invention relates also to the use of the polymer composition for surface sizing of paper, board or the like as well as to a surface size composition comprising it.

Abstract: A method for monitoring hydrophobic particles contained in a pulp suspension, includes obtaining a sample from a pulp suspension or a filtrate of the pulp suspension. A fluorescent dye is added to the sample to stain particles in the sample. The sample is fractionated to obtain at least a first fraction and a second fraction, wherein the second fraction is a fiber fraction. The method includes for the obtained fractions, fluorescence emitted by the particles in the fractions, calculating an integral of the fluorescence measured for the fractions excluding the fiber fraction, and correlating the calculated integral of the fluorescence to the amount of acetone soluble material in the pulp suspension, and optionally measuring light scattering signal of the particles in at least first and second fractions.

Abstract: A method and a composition for treating tailings from a separation process are disclosed, where bitumen is separated from mineral solids. Tailings include an aqueous phase with suspended solid particulate material and residual bitumen and have a dry solids content <25 weight-%. The method includes addition of a flocculating agent including polyacrylamide to the tailings, as well as addition of an auxiliary agent including ionic liquid to tailings in conjunction with the flocculating agent. Flocs, which include solid particulate material, are formed and the formed flocs are separated from the aqueous phase. The composition in a copolymer of (meth)acrylamide and an auxiliary agent comprising ionic liquid.

Abstract: The present embodiments generally relate to the use of one or more polymers, e.g., one or more dry acid polymers and/or one or more dry acid polymers with salt, as flocculants, generally for treating tailings, e.g., oil sands tailings, in need of solid-liquid separation, e.g., in order to efficiently recycle water and/or to reduce the volume of tailings which may be transferred to a tailings pond and/or a dedicated disposal area.

Abstract: Disclosed is a method for controlling a biofilm, for removing a formed biofilm and/or for controlling a growth of microorganisms, preferably bacteria, in an aqueous environment of an industrial manufacturing process including cellulosic fibre material. In the method, a composition including a compound selected from a group consisting of 3-[(4-methylphenyl)sulphonyl]-2-propenenitrile and 4-amino-N-2-thiazolyl-benzenesulphonamide is administered to the aqueous environment of the process.

Abstract: A hydrotropic composition including at least one surface active cationic component, which is selected from a group of cholinium, guadinium or tetramethylguadinium, preferably cholinium, and a straight or branched carboxylate anion having at least six carbon atoms and its uses, for treating of oil sands or the like, for treating tailings from separation of bitumen, asphaltenes or the like.

Abstract: Methods and systems are disclosed for optimization of coagulation and/or flocculation in a water treatment process. According to exemplary embodiments, samples are taken from an aqueous liquid and the samples are monitored with an imaging device to capture visual data of particles dispersed or suspended in the liquid. The particles are classified into particle types based on the visual data and a particle size distribution indication is computed for each classified particle type. The particle size distribution indication is then compared to a predetermined particle size distribution value, and in response to a difference detected, dosage of at least one coagulation and/or flocculation agent in the water treatment process can be adjusted.

Abstract: A manufacturing method of a paper, board or the like having a grammage in a range of 125-600 g/m2, preferably 150-210 g/m2, including adding a paper sizing agent including maleated vegetable oil and an alkenyl succinic anhydride (ASA) to a fibre stock including at least 80 weight-% of recycled fibre material and having calcium concentration of at least 500 mg/l, expressed as CaO.

Abstract: A dry strength composition for manufacture of paper, board or the like is disclosed. The dry strength composition includes, as a mixture, at least one anionically derivatized polysaccharide, and cationic starch having an amylopectin content ?80 weight-%. The anionically derivatized polysaccharide and the cationic starch provide the composition with a charge density in a range of 0.1-1.5 meq/g, when measured at pH 2.8, and ?0.1-?3 meq/g, preferably ?0.3-?2.5 meq/g, more preferably ?0.5-?2.0 meq/g, when measured as an aqueous solution, at pH 7.0. Further disclosed are a use of the composition and a method for manufacturing paper, board or the like.

Abstract: An improved process for making paper or paper board is provided. The process comprises providing a cellulosic fibre suspension comprising recycled fibre material, and having a conductivity of at least 1.5 mS/cm; and adding a glyoxalated copolymer of acrylamide and cationic monomers and inorganic siliceous microparticles to the fibre suspension, sequentially or simultaneously. Advantages comprise improved productivity of the process, and paper strength.

Abstract: The invention relates to a composition for modifying rheology of coating colour and its use. The composition comprises an aqueous polymer dispersion, comprising a copolymer of monomer (a), which is at least one optionally substituted styrene, and monomer (b), which is at least one C1-C4-alkyl (meth)acrylate. The copolymer has a particle size D50<100 nm. Composition comprises also degraded starch having an average molecular weight Mn<1000 g/mol.

Abstract: A process for a preparation of arylsulfonylpropenenitriles is disclosed. A reaction starting from arylsulfonyl iodides is catalyzed by light. The process is scalable, environmentally benign and provides the product in good yield.

Abstract: The present invention relates to a process for producing a paper or a board product having increased dimension stability including providing a fibre slurry including never-dried fibres, treating the fibre slurry with a strength composition, and forming a paper or a board product from the treated fibre slurry, where the strength composition includes a permanent wet strength resin component and a sizing agent. The present invention further relates to a use of a strength composition for increasing dimensional stability of a paper and a board, and to a paper or a board product having improved dimensional stability.

Abstract: The invention relates to a surfactant composition comprising an ionic liquid prepared from an unsubsituted or substituted primary, secondary or tertiary amine, or from an unsubstituted or substituted pyridine, amidine or guanidine with at least one fatty acid and/or resin acid. The invention also relates to a method for treating bitumen froth from a separation process, where bitumen is separated from mineral solids. The method comprises addition of said surfactant composition to the diluent and/or to the froth before phase separation.

Abstract: The invention relates to a method for providing at least one input parameter of a sludge dewatering process of a wastewater treatment plant. The method comprises: obtaining data representing process and/or plant configuration data of said wastewater treatment plant; feeding at least part of the obtained data to at least one model formed at least by historical process and plant configuration data gathered from a plurality of wastewater treatment plants combined with properties of applied chemicals in said wastewater treatment plants; and predicting at least one input parameter and/or at least one output parameter of the sludge dewatering process by means of the at least one model for adjusting sludge dewatering process of said wastewater treatment plant. The invention relates also to a computing unit for performing at least partly the method.