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Biodegradation of Organic Pollutants in Condensing Water from Wood Chip Gasification Hanna Prokkola1, Toivo Kuokkanen1, Ulla Lassi1,2 1 University of Oulu, Department of Chemistry, Finland 2 University of Jyväskylä, Kokkola University Consortium Chydenius, Unit of Applied Chemistry, Finland Introduction Biomass used as a source of renewable energy includes plant material from photosynthesis, such as algae, trees, and crops. The energy is stored with chemical bonds to carbohydrates. When the biomass is processed chemically or biologically, the energy stored in the chemical bonds can be utilized. The carbon dioxide produced is then available to produce new biomass. In this way the carbon dioxide is absorbed and returned for a cycle of new growth (McKendry, 2002). Water in wood samples can exist in two places: in the cell cavity as free water or as absorbed water in the cell walls (Bousquet, 2000). The chemically bound water in the cell walls is attached to cellulose with hydrogen bonds and it is more difficult to remove in the drying process than the free water from the cell cavities (Thuvander et al., 2002) Condensing water: what is it? Water in wood chips is vaporized during gasification and some organic components are distilled along with it. The amount of condensing water is dependent on the moisture content of the gasified wood chips and the temperature. This wastewater is typically a very heterogenic solution, containing organic components such as tars and small organic acids. This wastewater should be purified before sewering. A water sample taken 93PDF Image | BIOMASS TO ENERGY AND CHEMICALS HighBio2 Project Publication
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