Acknowledgements
The authors acknowledge the financial support of the National
Natural Science Foundation of China (Grant No. 51306036), the
National Basic Research Program of China (973 Program, Grant
2012CB215306) and the Jiangsu Natural Science Foundation
(Grant No. BK20130615).
Appendix A. Supplementary data
Supplementary data associated with this article can be found, in
the online version, at http://dx.doi.org/10.1016/j.biortech.2015.05.
040.
References