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Biodegradation of spent pulping liquor lignins under mesophilic and thermophilic anaerobic conditions.

Application: This study may help mills improve the efficiency of their anaerobic digesters.

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We conducted a laboratory scale feasibility study on the anaerobic treatment of spent pulping liquor effluent in upflow anaerobic sludge bed reactors. We tested thermophilic and mesophilic conditions and found that, in spite of high levels of sodium and lignin in the liquor, up to 80% of CODs can be successfully removed at a specific removal rate of 0.22 g COD [g.sup.-1] VSS [d.sup.-1] for mesophilic conditions and 0.57 g COD [g.sup.-1] VSS [d.sup.-1] for thermophilic conditions. Throughout the experiment, we observed lignin accumulation in the mesophilic reactor, but not in the thermophilic reactor. Lignin measurements confirmed that up to 59% of lignin was degraded under thermophilic conditions. It appeared that higher activity of thermophilic biomass coupled with higher solubility and hence bioavailability of lignin under thermophilic conditions contributed to the observed lignin removal. S!

Tartakovsky, Cimpoia, and Guiot are with the Biotechnology Research Institute, NRCC, 6100 Royalmount Ave., Montreal, Quebec, Canada H4P 2R2; Lo is with Domtar Inc., Cornwall, Ontario; Petti is with MDS Nordion, Ottawa, Ontario; and Liard is a consultant. Email Guiot at Serge.Guiot@nrc.ca.
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Title Annotation:Environmental
Author:Guiot, Serge R.
Publication:Solutions - for People, Processes and Paper
Date:Apr 1, 2003
Words:203
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