Eco- and water efficiency development prospects in Pulp-Board integrate.

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1 Eco- and water efficiency development prospects in Jari Räsänen, StoraEnso Oyj March 22,

2 Some remarks as considering water: Water covers 70.9% of the Earth's surface, and is vital for all known forms of life. Water is transparent liquid Water may be in liquid, ice or vapour/steam formulations Water fit for human consumption is called drinking water or potable water. Water that is not potable may be made potable by filtration or distillation, or by a range of other methods. Water is very basic element need in to pulp and papermaking March 22,

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6 Raw water purification for pulp and papermaking process. Precipitation of harmful organic and inorganic compounds and physical debris in raw-water purification plant. (For example, PAC is in use) Question on difficult humus removal (humus=colored dark brown or black colloidal mass of partially decomposed organic matter in the soil which is mixed in to the water in molecular level). This humus is one main source which will effect dramatically in to the brightness of paper endproducts. Process water purification during pulp and papermaking process. Recycling the process water in separate process areas as target to save raw water. There is a need to clean different type of process water in different purity level. Sand removal Metals & salt removal Anionic trash removal Organic harmful compounds removal Microbe removal The most dirtiest fraction need to be remove in right place by using the easiest and cost efficient technology March 22,

7 Purification technologies Surface cleaning technologies Electrochemical purification by using changing electrical fields Coating of surfaces to keep them clean. For example teflon or other coatings in to the pipelines Polishing of the surfaces in pipes Ultraviolet light Filtration in different mesh level Question of efficiency and life-time of filter material Usually very high amount of l/s is needed to be filtered (liter/second) Filtration capacity/cost of filtered m3 is bottleneck nowadays Purification technologies more closely Particle filtration Fractionation Cleaners Flotation Micro flotation Micro filtration Ultra filtration Nano filtration Reverse osmosis Evaporation Energy, maintenance, filtration capacity m3/s are limiting factors March 22,

8 Energy efficient wood handling and processing Debarking (efficient use of wood bark) Melting of ice when logs/chips are used in winter time (steam and hot water) Water pumping efficiency Refining energy consumption (refiner geometry, blade type etc.) Working lightning with new technology (energy savings, possibility) Led light and other new lightning technologies in industrial scale Pulping & Biorefinery Forest based chemicals may be possible to separate from pulping processes Key for this biorefinery activity is sophisticated, simple and very cost efficient separation technology to apply. Separation technologies need to be developed further to be cost efficient in large scale processing in pulp lines. Volume and huge material flows are limiting factors in today for biorefinery included in pulping process. March 22,

9 Paper & board making process Machine line rebuilds need cost efficient new technology to be apply Separate process units may be replaced new ones, but main line construction stay same as earlier. New technology need to be remarkable better than old to be selected in to the rebuild use of traditional machine lines. Refiners, head boxes, steam boxes, shower systems, calender etc. machine unit parts are examples where there are need for further development to keep today s machine lines in cost efficient production capability also in the future. Green field machines are easier to build up with best available technology than older machine lines where re-builds include only partial up-dating of machinery. In old machine lines up-dating with new machine parts are usually made by using shoehorn due to limited free space to be applied for installation. Driving force for up-dating of machinery is cost savings, better material efficiency and increasing productivity for each line March 22,

10 Waste water flow out from the mills Waste water treatment efficiency. Biological and chemical purification COD, TOC, phosphorus and other chemicals need to be take out from the waste water during purification Legislation is setting the limits for water and air emissions from the mills Demands for high class purification of waste waters are increasing all the time Are there valuable minerals in waste water flow to be taken out cost efficient way Waste material flow out from the mills (mainly sludge with water) Water containing sludge Fiber reuse in efficient way is need if it is possible to do How to modify sludge in to the better form as energy source (remove water by using the most cost efficient way) Gas recovery from dumping areas March 22,

11 Waste heat released out from the mills Waste heat is available in large scale. Low energy steam is released from paper mills for example heat released from the paper machine drying section straight in to the air Waste water include large scale heating power Heat exchangers need to be cost efficient to up-date Waste ash from power plant Waste ash is available in large scale There are need to invent some good re-using possibilities for this ash in cost efficient way. Dumping areas or landfill is not sustainable way to use this ash in longer perspective. (Increasing costs due to legislation) March 22,

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