1. Effects of bacterial treatments on wood extractives
- Author
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Liisa Viikari, Matti Siika-aho, Jonas Konn, Anne Kallioinen, Marjaana Rättö, and Anu Vaari
- Subjects
Paper ,Microbial metabolism ,Industrial Waste ,Bioengineering ,lipophilic wood extractives ,Applied Microbiology and Biotechnology ,Bioreactors ,Nutrient ,Species Specificity ,Pseudomonas ,Botany ,Wood degradation ,Plant metabolism ,Food science ,Picea ,Biopulping, lipophilic wood extractives ,Bacteria ,biology ,Plant Extracts ,Chemistry ,Water pollutants ,General Medicine ,Biodegradation ,biology.organism_classification ,Wood ,Pitch ,Biodegradation, Environmental ,Norway spruce ,Rahnella ,Biopulping ,Resins, Plant ,Water Pollutants, Chemical ,Biotechnology - Abstract
Bacterial strains were isolated from spruce wood chips and their ability to reduce the content of wood extractives was studied. Strains were screened by cultivation on liquid media containing wood extractives as the major nutrient. Some bacterial species could decrease remarkably the amount of extractives in the liquid media and reduced the amount of triglycerides, steryl esters and total extractives by 100, 20 and 39%, respectively. Spruce wood chips were treated in controlled conditions with selected bacteria to test their effects on the chips. All the bacteria grew well on wood chips. The effect of bacterial metabolism on wood extractives was significant. Bacterial treatments reduced the amount of lipophilic extractives by 16-38% in 1 week of treatment and up to 67% in 2 weeks. The most efficient strain removed 90, 66 and 50% of triglycerides, steryl esters and resin acids, respectively, in 2 weeks. These results indicate that bacteria may be promising agents for the removal of extractives for improved pulping and papermaking processes.
- Published
- 2003
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