The key problem is how to make the biodegradation of lignin much easier because the degradation of cellulose is easy by microorganisms but it is covered by lignin.
虽然纤维素较木质素易降解，但其被木质素包裹，故降解的关键问题就是木质素的降解。
In recent years, to solve some environmental issues, microbial flocculants have been involved widely due to their some advantages such as easy-biodegradation, innocuity and non-secondary pollution.
近几年，为了解决环境问题，可生物降解、无毒无害、无二次污染的微生物絮凝剂受到人们的广泛关注。
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