ANAEROBIC BIODEGRADABILITY OF TCF-BLEACHING EFFLUENTS FROM ORGANOSOLV NON-WOOD PULPING Paula Paananen University of Oulu Chemical Process Engineering Laboratory 1. Introduction Pulping of non-wood fibres, such as cereals and reeds, has a major significance in areas suffering from lack of forests, which is further emphasized by deforestation and resulting flooding. However, prevalent alkali non-wood pulping technologies have caused severe environmental pollution in dominating non-wood pulping areas, China and India. New technologies are needed in order to avoid increasing transcontinental transportation of pulp, fibre or recovered paper to the Asian densely populated areas that furthermore have plenty of lignocellulosic agricultural residues available (1, 2). In addition to the enhancements of alkali delignification, black liquor de-silication and chemical recovery technologies, entirely new organosolv pulping processes have been developed. Due to the acidic delignification the most crucial problems deriving from dissolved silica in the cooking liquors are avoided. At present, the world’s first formic acid based organosolv non-wood pulp mill is being constructed in China. The mill will be equipped with total chlorine free (TCF) bleaching (3). Pulping effluents are known to contain highly inhibitory or toxic compounds to anaerobic wastewater treatment (4). In present study, the anaerobic biodegradability of TCF-bleaching effluents originating from a sulfur-free formic acid pilot-scale pulping of wheat straw was evaluated. Makalenin tamamına ekten ulaşabilirsiniz.