源于制鞋工业的固体废料处理(英文)

Processing of Solid Leather By-products from Shoe-making Industry

铬鞣革和涂饰革在世界范围内每年带来成千上万吨的废弃物。文章研究了不同成革种类在生产过程中带来的废弃物。通过酶法水解可将固体废弃物分解成两类产品:低相对分子质量(约10,000 Da)的可溶性胶原;含铬和剩余蛋白的不溶性铬饼。利用3步酶法水解固体废弃物,同时根据水解物中的含氮量来表征水解的效率。在理论条件下,水解的有效率可达73%。胶原水解物含铬量相当低(不超过100 mg/kg)。

Chrome-tanned and finished leather clicking waste represents several hundreds thousand tons per year annually world-wide. The paper deals with the study on processing of leather wastes arising from leather （mainly shoe, garments, upholstery） industry. Solid leather waste was treated through enzymatic hydrolysis into two products： water-soluble collagen hydrolysate of low molecular mass （approx. 10,000 Da） and remained insoluble cake containing chromium and residual protein. A 3-stage enzymatic hydrolysis was applied and the efficiency of the process was monitored by the degree of leather waste hydrolysis expressed by nitrogen content in collagen hydrolysate. Under proposed optimal conditions the efficiency of hydrolysis can reach up to 73%. Collagen hydrolysate thus prepared contains, in addition, very low chromium content （not more than 100 mg/kg）.