5Raghava Rao J, Kanthimathi M, Thanika- ivelan P, et al. Pickling - free chrome tanning using a polymeric synthetic tan- ning agent for cleaner leather processing [J ]. Clean Technologies and Environ- mental Policy ,2004,6:243 - 249.
6Chowdhury M, Mostafa G, Biswas T K, et al. Characterization of the effluents from leather processing industries [ J ]. Environ. Process ,2015,02 : 173 - 187.
7Aravindhan R, Saravanabhavan S, Thani- kaivelan P, et al. A chemo- enzymatic pathway leads towards zero discharge tan- ning [ J ]. Journal of Cleaner Production, 2007,15:'1 217- 1 227.
9Li Kai, Chert Hui, Wang Yajuan, et al. A salt -free pickling regime for hides and skins using oxazolidine [ J ]. Journal of Cleaner Production, 2009, 17 : 1 603 - 1 606.
