Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 36, Issue 12, Pages 1957-1965Publisher
SPRINGER
DOI: 10.1007/s00449-013-0972-9
Keywords
Pandoraea sp B-6; Kraft lignin; Degradation; Black liquor
Funding
- National Funds for Distinguished Young Scientists of China [50925417]
- National Natural Science Foundation of China [51074191]
- Key Project of National Natural Science Foundation of China [50830301]
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Kraft lignin (KL) is the major pollutant in black liquor. The bacterial strain Pandoraea sp. B-6 was able to degrade KL without any co-substrate under high alkaline conditions. At least 38.2 % of chemical oxygen demand and 41.6 % of color were removed in 7 days at concentrations from 1 to 6 g L-1. The optimum pH for KL degradation was 10 and the optimum temperature was 30 A degrees C. The greatest activities of 2,249.2 U L-1 for manganese peroxidase and 1,120.6 U L-1 for laccase were detected on the third and fifth day at pH 10, respectively. Many small molecules, such as cinnamic acid, ferulic acid, 2-hydroxy benzyl alcohol, and vanillyl methyl ketone, were formed during the period of KL degradation based on GC-MS analysis. These results indicate that this strain has great potential for biotreatment of black liquor.
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