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Lignin is one of the most recalcitrant natural biopolymers in the world,which can be found in various industrial wastewater and sludge.Lignin protects cellulose and hemicellulose andmakes them inaccessible for the bacteria to digest[1].Degradation of lignin will make cellulose content of the sludge accessible,hence increases the efficiency of methane production from the sludge in anaerobic digesters.Also,lignin usually considered as inert or non-degradable COD in wastewater or sludge since common treatment methods are unable to degrade this recalcitrant complex.Therefore,degradation of lignin would be an important step towards clean water.