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

Konu, 'Atıksuların Arıtılması' kısmında Fatih Özcan tarafından paylaşıldı.

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    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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