Towards zero discharge of chromium-containing leather waste through improved alkali hydrolysis

被引:111
作者
Mu, C [1 ]
Lin, W
Zhang, MR
Zhu, QS
机构
[1] Sichuan Univ, Minist Educ, Key Lab Leather Chem & Engn, Chengdu 610065, Sichuan, Peoples R China
[2] Univ Sci & Technol China, Dept Phys Chem, Open Lab Bond Select Chem, Hefei 230026, Anhui, Peoples R China
关键词
D O I
10.1016/S0956-053X(03)00040-0
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The treatment of chromium-containing leather waste (CCLW), the major solid waste generated at the post-tanning operations of leather processing, has the potential to generate value-added leather chemicals. Various alkali and enzymatic hydrolysis were compared, and calcium oxide was found to be important for effective (but still incomplete) hydrolysis. Three possible reasons are given for the incomplete hydrolysis under alkaline conditions. Data for 19 amino acids are presented for four different treatment products. On the basis of the results, a novel three-step CCLW treatment process is proposed. The gelatin extracted in the first step is chemically modified to produce leather finishing agents. The collagen hydrolysates isolated in the second step are used as proteinic retanning agents by chemical modification. The remaining chrome cake is further hydrolyzed with acids in the third step, and the obtained chromium-containing protein hydrolysates could be used for the preparation of chromium-containing retanning agents for leather industry. The proposed three-step process provides a feasible zero discharge process for the treatment of CCLW. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:835 / 843
页数:9
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