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Stabilization and cyclic utilization of chrome leather shavings
Jiangen Yang1, Zhihua Shan2, Yiwei Zhang1
1Key Laboratory of Leather Chemistry and Engineering of the Ministry of Education, Sichuan University, Chengdu, 610065, China.
Environmental Science and Pollution Research International
|December 20, 2018
Summary
This study optimized chrome leather shavings (CLS) stabilization using hydroxyapatite (HAP) for safe reuse. The process efficiently extracts valuable collagen degradation products (CDP) and generates reusable materials, eliminating waste.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Chrome leather shavings (CLS) pose disposal challenges due to chromium content.
- Developing sustainable methods for CLS utilization is crucial for the leather industry.
- Temporary stabilization is key for safe storage and transport of CLS.
Purpose of the Study:
- To optimize the temporary stabilization of CLS for safe and efficient cyclic utilization.
- To investigate the large-scale degradation of stabilized CLS and extraction of collagen degradation products (CDP).
- To explore the valorization of byproducts from stabilized CLS processing.
Main Methods:
- Stabilization of CLS using hydroxyapatite (HAP) and calcium hydroxide (Ca(OH)2).
- Optimization of stabilization conditions (HAP concentration, temperature, time, water content).
- Characterization of stabilized CLS and extracted products using EDS, hydrolysis, and acid extraction.
Main Results:
- HAP demonstrated superior stabilization of CLS against chrome leaching compared to Ca(OH)2.
- Optimized conditions (2% HAP, 300°C, 60 min, 50% water) yielded minimal chromium leaching.
- Hydrolysis produced CDP with 3.52% free amino content and 3.4-30 kDa molecular weight.
- Valorization yielded chromium-containing organic compounds (COP) for tannery use and industrial gypsum for building materials.
Conclusions:
- The optimized HAP-based stabilization method is effective for safe CLS management.
- The process enables the recovery of valuable CDP and byproducts, promoting a circular economy.
- This approach offers a zero-waste solution for chrome leather shavings utilization.
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