Anaerobic Biodegradabilitiy of TCT-Bleaching Effluents from Organosolv non-wood

Fatih Özcan

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7 Aralık 2008
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Astana
#1
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.

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