Application of CRBD to Reducing Pollution of Leather Tanning Wastewater

Abstract:

Trivalent chrome has an abroad application in the area of leather tanning, electrolytic plating and dyeing due to the strong capability of coordination. Pollution caused by chrome salts cannot be ignored. This paper proved that the chrome tanning wastewater can be treatment by chrome chelates (CRBD). The supernatant was reused in washing and pickling process and chromium sludge was utilized to make regeneration chrome-tanning agents; which all not only protect the environment but also save production cost. A series of experiment results showed that SO₄^2-and oil contents increased slightly as well as Cl^- content decreased when the tanning wastewater recycled several times. The total chrome content was up but the influence evaluated by the finish leather was not evident. Items of wet-blue leather and finish leather were tested such as shrinkage temperature, Cr₂O₃ in the leather, softness, fullness and so on. In the meantime, the physical and mechanical properties of the finish leather were not less than the common tanning method. Besides, the leather rate significantly increased when the regenerative chrome-tanning agent was used on retanning process.

• Periodical: Advanced Materials Research (Volume 800)
• Pages: 593-596
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.800.593
• Online since: September 2013
• Authors: Shan Cao, Bao Zhen Cheng, Hai Li Zhang, Guo Wei Geng
• Keywords: Chelate, Chrome, Recycling, Regenerative Agent, Tanning Wastewater

References

[1] Yu Kaiqin, Cheng Baozhen, A New Survey on the Clean Technology of Leather Manufacture[J]. WESTLEATHER. Feb, 2009. 19-25.

[2] Cheng Baozhen, Cao Shan, Liu Na, Niu Yan, Treatment and Recycling of Chrome Tanning waste water[C]. XXXI IULTCS Congress. Sep, (2011).

[3] Guo Jinzhong, Luo xiao, Hua Sudong, Study on the performance of shock resistance and anti-channeling cement slurry[J]. DRILLING FLUID&COMPLETION FLUID, 2010, 27(4): 59-65.

[4] K.J. Goodwin, SPE, Mobil Technology Co., Oil well/gas well cement-sheath evaluation[R]. SPE39209, (1997).