Multivariate Statistics of the Pyrolysis Products of High Molecular Components in Pulping Wastewaters to Explain Their Toxicity (6 pp)

Abstract

From the CH fragments, 2-furfural in TCF, and from the LIG fragments, styrene in ECF showed the highest probabilities of originating from source structures of toxicity. Other possible compounds in concern were indicated to be CH fragment 2-methyl-2-cyclopenten-1-one in ECF and LIG fragments 2-methoxy-4-methylphenol, 4,5-dimethoxy-2-methylphenol and 2-methylphenol in TCF.

Size-exclusion chromatographic study of ECF and TCF softwood kraft pulp bleaching liquors

“…Recently, multivariate statistics of the pyrolysis products of HMW components in above liquors have been used to explain their toxicity (Kukkola et al 2006;Paasivirta et al 2005). The aim of the present study is to determine the MWD of waste liquors from ECF and TCF bleaching sequences by SEC.…”

Removal of AOX, total nitrogen and chlorinated lignin from bleached Kraft mill effluents by UV oxidation in the presence of hydrogen peroxide utilizing TiO2 as photocatalyst

“…Pulp mill effluents consist of a complex mixture of organic compounds and their composition can be markedly different by the type of pulping and bleaching technology employed, wood furnish and the extent of primary and secondary effluent treatment (Ali and Sreekrishnan 2001;Paasivirta et al 2005;Zhu et al 2000). In general, the effluents contain degradation products of extractives, carbohydrates, and lignin in wood, although some of the extractives might not undergo degradation.…”

“…Much research on the fate of compounds in the pulp mill effluents has focused on chlorinated compounds such as, chlorinated phenols, in term of absorbable organic halogen (AOX), and high molecular weight chlorinated lignin derivatives Diez et al 1999;Rodriguez et al 2000;Uğurlu et al 2007a). Papermill effluents contain a complex mixture of various classes of organic compounds and, in pulp mill effluents, more than 300 compounds have been identified to date (US EPA 1992;Frostell et al 1994;Basibuyuk and Forster 2003;Saquib and Muneer 2003;Paasivirta et al 2005).…”

Modificações estruturais da lignina causada por fungos

“…Ortega-Clemente et al PESSALA et al, 2009). Após o tratamento químico e biológico do licor negro, Paasivirta et al (2005) estimaram que o estireno e furfural, gerados após a degradação de carboidratos e da lignina, respectivamente, foram a causa da toxicidade em bioensaios.…”