Evolution of lignocellulosic macrocomponents in the wastewater streams of a sulfite pulp mill: a preliminary biorefining approach
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URI: http://hdl.handle.net/10902/9643DOI: 10.1155/2015/102534
ISSN: 2090-9063
ISSN: 2090-9071
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Llano Astuy, Tamara; García Quevedo, Noelia; Quijorna Kyburz, Natalia; Viguri Fuente, Javier Rufino; Coz Fernández, AlbertoFecha
2015Derechos
Atribución 3.0 España
Publicado en
Journal of Chemistry, 2015, Article ID 102534
Editorial
Hindawi Publishing Corporation
Resumen/Abstract
The evolution of lignin, five-and six-carbon sugars, and other decomposition products derived from hemicelluloses and cellulose was monitored in a sulfite pulp mill. The wastewater streams were characterized and the mass balances throughout digestion and total chlorine free bleaching stages were determined. Summative analysis in conjunction with pulp parameters highlights some process guidelines and valorization alternatives towards the transformation of the traditional factory into a lignocellulosic biorefinery.The results showed a good separation of cellulose (99.64%) during wood digestion, with 87.23% of hemicellulose and 98.47% lignin dissolved into the waste streams. The following steps should be carried out to increase the sugar content into the waste streams: (i) optimization of the digestion conditions increasing hemicellulose depolymerization; (ii) improvement of the ozonation and peroxide bleaching stages, avoiding deconstruction of the cellulose chains but maintaining impurity removal; (iii) fractionation of the waste water streams, separating sugars fromthe rest of toxic inhibitors for 2nd generation biofuel production. A total of 0.173 L of second-generation ethanol can be obtained in the spent liquor per gramof dry wood.The proposed methodology can be usefully incorporated into other related industrial sectors.
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